Chemical Industry & Chemical Engineering Quarterly
type: channel
description: The Chemical Industry & Chemical Engineering Quarterly (CI&CEQ), as an international peer-reviewed research journal, invites contributions of original and novel fundamental research related to chemical industry and chemical engineering and connected areas. Papers describing novel theory and its application to practice as well as those reporting experimental work, which is soundly interpreted, are welcome. Articles published in this Journal are indexed in InCitesTMJournal Citation ReportsR - Clarivate and SCOPUS. The full search of the Journal is available through DOAJ. Need a Username/Password? P lease Register. Already have a Username/Password for CICEQ? GO TO LOGIN! Manuscript Submission Starting from June 2023 Processing Fee is 200 EUR +20 % VAT Editor-in-Chief Vlada Veljković Faculty of Technology, University of Niš, Bulevar oslobođenja 124, 16000 Leskovac, Serbia Associate Editors Srđan Pejanović Department of Chemical Engineering, Faculty of Technology and Metallurgy, University of Belgrade, Serbia Dunja Sokolović Faculty of Technical Sceinces, University of Novi Sad, Serbia Ivona Radović Faculty of Technology and Metallurgy, University of Belgrade, Serbia Online ISSN 2217-7434 Print ISSN 1451-9372 This is an open access journal, which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking priorpermission from the publisher or the author.
publisher: Association of the Chemical Engineers of Serbia
language: en
publication name: Chemical Industry & Chemical Engineering Quarterly
issn: 1451-9372
copyright: Authors who publish with this journal agree to the following terms: Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal. Authors grant to the Publisher the following rights to the manuscript, including any supplemental material, and any parts, extracts or elements thereof: the right to reproduce and distribute the Manuscript in printed form, including print-on-demand; the right to produce prepublications, reprints, and special editions of the Manuscript; the right to translate the Manuscript into other languages; the right to reproduce the Manuscript using photomechanical or similar means including, but not limited to photocopy, and the right to distribute these reproductions; the right to reproduce and distribute the Manuscript electronically or optically on any and all data carriers or storage media – especially in machine readable/digitalized form on data carriers such as hard drive, CD-Rom, DVD, Blu-ray Disc (BD), Mini-Disk, data tape – and the right to reproduce and distribute the Article via these data carriers; the right to store the Manuscript in databases, including online databases, and the right of transmission of the Manuscript in all technical systems and modes; the right to make the Manuscript available to the public or to closed user groups on individual demand, for use on monitors or other readers (including e-books), and in printable form for the user, either via the internet, other online services, or via internal or external networks.
items: PERFORMANCE OPTIMIZATION OF ECM PARAMETERS FOR PALLADIUM COATED TOOL ELECTRODE USING MULTI-CRITERIA DECISION ANALYSIS METHOD
items: POTENTIAL OF ULTRASONIC IRRADIATION IN POLYURETHANE DEGRADATION IN DEEP EUTECTIC SOLVENTS
items: STUDY OF COMBUSTION AND PERFORMANCE IN A DIESEL ENGINE FUELED BY BIODIESEL-NANOPARTICLE BLENDS
items: DESIGN OF INDUSTRY-CENTRIC CONTROLLER FOR MIMO CSTH PROCESS WITH ENHANCED DISTURBANCE REJECTION
items: COMBUSTION, PERFORMANCE, AND EMISSION CHARACTERISTICS OF A CI ENGINE USING Borassus flabellifer BIODIESEL BLENDS
items: APPLYING DENSITY FUNCTIONAL THEORY TO PREDICT THE REDUCTION POTENTIAL IN THE INDIGO DYEING PROCESS
items: GLUTEN AND GLUTEN-FREE BISCUITS WITH FUNCTIONAL COMPONENTS: PHYSICOCHEMICAL, NUTRITIONAL AND ANTIOXIDANT PROPERTIES
items: COMPARATIVE ANALYSIS OF MORINGA OIL AND RUBBER SEED OIL BIODIESELS IN DIESEL ENGINES
items: SPRAY DRYING OF PHOSPHATE-SOLUBILIZING BACTERIA FOR THE PRODUCTION OF NEW BIOFERTILIZERS
items: REMOVAL OF ISOPROPYL ALCOHOL FROM WASTEWATER USING MODIFIED BENTONITE BY Fe, Cu, AND Fe-Cu
items: Analyzing the efficacy and exhausts of punnai biodiesel-ethanol blends in nanocoated ci engines
items: The impact of heat storage material integration in an evacuated tube collector
items: Investigating the acidity effect of niobia as catalytic support for furfural conversion
items: Grape pomace extract as a colorant for textile printing applications
items: Involvement of aminoalkylated merrifield resins retracted by bis(chlorodiethyl) ether in metal extraction
items: Dye degradation using piperazine encapsulated biosynthesized iron nanoparticles
items: Potential application as a bio-coagulant for Moringa oleifera seeds
items: Novel Achillea wilhelmsii C. Koch nanocomposite fabrication with extraordinary physical and chemical properties
items: List of Referees July 2024 to April 2025
items: Author Index
items: Contents: Issues 1—4
items: Effect of hot air and hot air assisted microwave drying on drying kinetics and quality of red and white pitaya slices
items: Slot milling of AA7075 reinforced with nano silicon carbide particles – an experimental and finite element approach
items: Synthesis and characterization of activated carbon produced from hazelnut peels by chemical activation
items: INTENSIFIED MICROWAVE-ASSISTED HYDRODISTILLATION PRODUCES TRANS-ANETHOLE-RICH FENNEL (Foeniculim vulgare Mill.) FRUIT ESSENTIAL OIL
items: USE OF AN INTERNAL LOOP AIRLIFT BIOREACTOR TO PRODUCE POLYHYDROXYALKANOATES BY Stenotrophomonas rhizophila
items: QUALITY RESTORATION OF WASTE POLYOLEFIN PLASTIC MATERIAL THROUGH THE DISSOLUTION-REPRECIPITATION TECHNIQUE
items: REACTION PARAMETER OPTIMIZATION OF AMMONIUM SULFATE PRODUCTION FROM PHOSPHOGYPSUM
items: THE INFLUENCE OF VIBRATION VELOCITY ON THE NANOCOMPOSITE OF HALLOYSITE CLAY NANOTUBES
items: FORECASTING RESEARCH OF MIXING UNIFORMITY OF CERIUM CHLORIDE SOLUTION UNDER MICROWAVE HEATING

PERFORMANCE OPTIMIZATION OF ECM PARAMETERS FOR PALLADIUM COATED TOOL ELECTRODE USING MULTI-CRITERIA DECISION ANALYSIS METHOD
type: item
description: Electrochemical machining is an important process for fabricating difficult-to-cut materials. It is a much more advantageous process for creating excellent surface quality on a wide range of conductive materials. In this research, the electrode (cathode) is coated with less resistive palladium material through a sputtering process, and sodium electrolyte is added with 10 gl-1 ascorbic acid to improve Local electrolysis and reduce the sludge generation. The process parameters, specifically electrolyte concentration, machining voltage, duty cycle, and frequency, were varied on machining rate and overcut using the L27 orthogonal array experimental plan. ÉLimination Et Choix Traduisant la REalité (ELECTRE) is employed to find a suitable solution. Based on the ELECTRE method, the best factor combination is 29 g L-1electrolyte concentration, 12 V, 70% duty cycle, and 80 Hz frequency. The analysis of variance shows that machining voltage and electrolyte concentration are the considerable factors, with contribution percentages of 43.93% and 23.34%, respectively. As per the mean effect plot, the optimal combination is 29 g L-1 electrolyte concentration, 12 V, 90% duty cycle, and 80 Hz frequency.
subject: Article
  topic: section
subject: Machining rate
  topic: keywords
subject: overcut
  topic: keywords
subject: orthogonal array
  topic: keywords
subject: ANOVA
  topic: keywords
subject: ascorbic acid
  topic: keywords
subject: sputtering
  topic: keywords
creator: Nethaji Subash Chandra Bose Ayyavoo
creator: Saravanan Kandasamy Ganesan
creator: Niranjan Thiruchinapalli
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-09-13
publication date: 2025-09-13
doi: 10.2298/CICEQ250516025B

POTENTIAL OF ULTRASONIC IRRADIATION IN POLYURETHANE DEGRADATION IN DEEP EUTECTIC SOLVENTS
type: item
description: This study explores the degradation of polyurethane (PU) using deep eutectic solvents (DES) combined with ultrasonic irradiation, aiming to develop sustainable recycling techniques for PU waste. DES, formed from choline chloride and urea, possesses environmentally friendly properties such as low toxicity and high solubility, making it suitable for chemical recycling. Degradation experiments were conducted at elevated temperatures (130-150 °C), both with and without ultrasonic assistance. The technique of GPC is applied to determine the molecular weight of raw PU and the degradation product. The structures of DES, PU, and its degradation products were analysed using FTIR and NMR. The results indicate that the application of ultrasonics significantly enhances the degradation rate at approximately 5.20% from 58.51 ± 0.04% to 63.71 ± 0.03% at a constant temperature of 150 °C. This improvement is attributed to cavitation-induced effects, which facilitate polymer chain breakdown. Molecular transformations were confirmed through the presence of NH₃ groups resulting from the break of the PU structure to form o-toluidine, as identified by NMR. Reaction pathways were established through structural analysis of both raw PU and its degradation products. These findings demonstrate the potential of ultrasonic-assisted DES in advancing chemical recycling strategies for PU, addressing environmental concerns related to persistent PU waste, and promoting sustainable waste management practices.
subject: Article
  topic: section
subject: Ultrasonic
  topic: keywords
subject: Polymer recycling
  topic: keywords
subject: o-toluidine
  topic: keywords
creator: Amirah Nasuha Mohd Razib
creator: Nik Muhammad Azhar Nik Daud
creator: Mohd Al Hafiz Mohd Nawi
creator: Banu Ramasamy
creator: Mohd Sharizan Sharizan Md Sarip
creator: Amirul Ridzuan Abu Bakar
creator: Mohd Asraf Mohd Zainudin
creator: Ahmad Hazim Abdul Aziz
rights: Copyright (c) 2023 Amirah Nasuha Mohd Razib, Nik Muhammad Azhar Nik Daud, Mohd Al Hafiz Mohd Nawi, Banu Ramasamy, Mohd Sharizan Sharizan Md Sarip, Amirul Ridzuan Abu Bakar, Mohd Asraf Mohd Zainudin, Ahmad Hazim Abdul Aziz https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-09-09
publication date: 2025-09-09
doi: 10.2298/CICEQ250403023N

STUDY OF COMBUSTION AND PERFORMANCE IN A DIESEL ENGINE FUELED BY BIODIESEL-NANOPARTICLE BLENDS
type: item
description: This study examines the combustion and performance of avocado waste peel biodiesel (AWPB) combined with graphene oxide nanoplates (GONPs) as a substitute fuel for diesel engines. It also aims to assess the impact of engine combustion and performance while considering the feasibility of employing waste materials in fuel generation. The test fuels diesel, AWPB, AWPB+GONPs 50 ppm, and AWPB+GONPs 100 ppm were evaluated. The results showed that incylinder pressure in AWPB decreased by approximately 3.6% compared to diesel, while the heat release rate (HRR) increased notably in the AWPB+GONPs 100 ppm blend. Additionally, diesel exhibited higher ignition delay (ID) and combustion duration (CD) than all biodiesel blends. The addition of GONPs in AWPB led to a 5.98% increase in brake thermal efficiency (BTE) and a 30.12% reduction in brake-specific energy consumption (BSEC) compared to diesel. However, diesel still demonstrated higher engine torque, indicated mean effective pressure (IMEP), and air-fuel ratio (A/F ratio) relative to biodiesel fuels, whereas AWPB showed a higher exhaust gas temperature (EGT). These findings suggest that avocado peel biodiesel, when enhanced with GONPs, is a viable and cleaner alternative to conventional diesel, offering improved combustion efficiency and reduced energy consumption.
subject: Article
  topic: section
subject: waste to energy
  topic: keywords
subject: avocado waste peel biodiesel
  topic: keywords
subject: graphene oxide nanoplates
  topic: keywords
subject: performance
  topic: keywords
creator: Mohanrajhu Nathamuni
creator: Premkumar Duraisamy
creator: Rajakumar Muthusamy Palani
creator: Padmavathi Kuppusamy Ramamoorthy
rights: Copyright (c) 2023 Mohanrajhu Nathamuni, Premkumar Duraisamy, Rajakumar Muthusamy Palani, Padmavathi Kuppusamy Ramamoorthy https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-09-08
publication date: 2025-09-08
doi: 10.2298/CICEQ241112024N

DESIGN OF INDUSTRY-CENTRIC CONTROLLER FOR MIMO CSTH PROCESS WITH ENHANCED DISTURBANCE REJECTION
type: item
description: This paper focuses on designing an advanced control scheme tailored for large-scale industrial processes, where controllers must maintain effective performance despite significant disturbances and setpoint changes. The primary focus of the proposed RTD-A controller is on robust disturbance rejection. RTD-A possesses the benefits of both conventional PID and MPC control schemes. As model-based methods face challenges in addressing increasingly complex processes, data-driven techniques have gained popularity in industrial system monitoring due to their ability to handle unknown physical models. In this work, both the first-principle and transfer function models of the CSTH system are developed using real-time data and represented as a multi-input, multi-output (MIMO) system. PID, MPC, and RTD-A controllers are then applied to regulate the temperatures of the two tanks. The performance of these controllers is carefully examined using integral performance criteria and the time domain analysis to accurately assess their dynamic behavior and control precision. The results demonstrate that the RTD-A controller exhibits superior performance in mitigating disturbances. The RTD-A control strategy exhibits outstanding performance with near-zero overshoot (0% in servo and about 0.05% in regulatory responses) and stable settling times close to 430 - 440 seconds in both tanks. Although MPC and PID controllers offer quicker responses, their greater overshoot and longer settling times establish RTD-A as the preferred method for achieving reliable, precise, and safe control in industrial processes.
subject: Article
  topic: section
subject: CSTH
  topic: keywords
subject: MIMO
  topic: keywords
subject: PID
  topic: keywords
subject: MPC
  topic: keywords
subject: RTD-A
  topic: keywords
subject: Disturbance Rejection.
  topic: keywords
creator: Pream Anand Siva Shankaran
creator: Manamalli Deivasikamani
creator: Vasanthi Damodaran
creator: Mythily Mani
rights: Copyright (c) 2023 Pream Anand Siva Shankaran, Manamalli Deivasikamani, Vasanthi Damodaran, Mythily Mani https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-08-14
publication date: 2025-08-14
doi: 10.2298/CICEQ250306022S

COMBUSTION, PERFORMANCE, AND EMISSION CHARACTERISTICS OF A CI ENGINE USING Borassus flabellifer BIODIESEL BLENDS
type: item
description: Borassus flabellifer methyl esters (BFMEs) have a few attractive characteristics that make them a potential rival to diesel and other alternative fuels. This study presents the first comprehensive analysis of its performance, combustion, and emission characteristics in a diesel engine. In addition to a high calorific value, a high cetane number, and the availability of oxygen, constituting 10% of its total weight, it is also readily available. Experimental testing of BFMEs was conducted on a single-cylinder compression ignition (CI) engine in this stage. BFMEs were blended with diesel at various concentrations (20%, 40%, 60%, 80% and 100%). Blends of BFMEs were experimentally examined for their combustion properties, emissions, and performance. The CI engine was set to steady-state operation so that it would reach the optimum temperature for the conditions in which it was operating. Initially, it was found that neat BFMEs had the lowest thermal efficiency, while BFME20, BFME40, BFME60, and BFME80 all had a higher brake thermal efficiency (BTE) than BFME100 at rated load conditions (by 5.1%, 2.8%, 2.0%, and 1.4%, respectively). Compared to other blends, BFME20 and BFME40 have better fuel efficiency. Fuel efficiency was improved by a reason-able amount, and BFME20's consumption was reduced by 5.1% compared to BFME100. Compared to diesel, hydrocarbons, CO, and smoke emissions from BFME20 were reduced by 9.9%, 5.8%, and 3.71%, respectively. These results underscore the potential of low-ratio BFME blends as cleaner and more efficient biodiesel alternatives, highlighting BFME’s practical applicability in existing diesel engines without major modifications.
subject: Article
  topic: section
subject: Biodiesel
  topic: keywords
subject: Borassus flabellifer
  topic: keywords
subject: Combustion
  topic: keywords
subject: Performance and emission characteristics
  topic: keywords
creator: Sakthi Rajan Chandramurthy
creator: Silambarasan Ragunathan
creator: Ramesh Kumar Ayyakkannu
creator: Anbarasan Baluchamy
rights: Copyright (c) 2023 Sakthi Rajan Chandramurthy, Silambarasan Ragunathan, Ramesh Kumar Ayyakkannu, Anbarasan Baluchamy https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ250226019C

APPLYING DENSITY FUNCTIONAL THEORY TO PREDICT THE REDUCTION POTENTIAL IN THE INDIGO DYEING PROCESS
type: item
description: This study employs density functional theory (DFT) to quantify the electron donor-acceptor properties and polarizability of organic iron(II) salts as reducing agents in indigo dyeing processes. The potential of some iron(II) salts to serve as environmentally friendly alternatives to the ecologically harmful sodium dithionite in the indigo dyeing process was investigated. A comparative analysis assessed the redox potential of reduced indigo and the color strength of dyed fabrics. Experimental results identified iron(II) gluconate as the most efficient, yielding superior color intensity. Theoretical calculations using B3LYP/LANL2DZ confirmed the superior electron-donating ability of iron(II) gluconate compared to the other iron(II) salts. The indigo reduction ability with the iron(II) salts was evaluated on the basis of complexation energies. The theoretical thermodynamic study reveals that the indigo-iron(II) gluconate complex is the most thermodynamically stable, requiring less energy input for its formation compared to the other complexes. Iron(II) salts-to-indigo electron donations in the complexes studied have been revealed by Mulliken charge analysis. These findings highlight the efficiency of DFT-based approaches in accurately predicting the reducing capacity of iron(II) salts and their suitability as eco-friendly alternatives in indigo dyeing applications.
subject: Article
  topic: section
subject: indigo dyeing
  topic: keywords
subject: iron(II) salts
  topic: keywords
subject: DFT calculations
  topic: keywords
subject: experimental results
  topic: keywords
subject: complexation energy
  topic: keywords
creator: Maha Abdelileh
creator: Manel Ben Ticha
creator: Nizar Meksi
creator: Hatem DhaouadI
rights: Copyright (c) 2023 Maha Abdelileh, Manel Ben Ticha, Nizar Meksi, Hatem DhaouadI https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ250317020A

GLUTEN AND GLUTEN-FREE BISCUITS WITH FUNCTIONAL COMPONENTS: PHYSICOCHEMICAL, NUTRITIONAL AND ANTIOXIDANT PROPERTIES
type: item
description: This study aims to determine the effect of different compounds on the nutritional, antioxidant, microstructural, and color characteristics of biscuits classified as gluten and gluten-free. Namely, biscuits are enriched with dietary fibers, acacia fibers, spent coffee grounds, and anthocyanins. The addition of these functional components to biscuit matrix affected the physical properties of the biscuits; namely, the spread factor value of all biscuits ranged from 2.98 to 7.88, the content of total polyphenols increased, the highest polyphenol content was obtained in the gluten-free biscuits with added coffee grounds (77.98 mg), while in the biscuits with wheat flour has in the range of 44.62–128.63 mg. All gluten-free biscuits can be labeled as products with "rich in fiber" (6.32–7.68 g/100 g) and with a higher antioxidant content compared to biscuits without added ingredients. The total number of microorganisms in the tested cookies is below acceptable limits. The findings of this study show that the inclusion of raw nutritional components in the recipe of traditional gluten and gluten-free biscuits leads to an improvement in the nutritional value and other quality characteristics of the fortified food products.
subject: Article
  topic: section
subject: Antioxidant activity
  topic: keywords
subject: polyphenol content
  topic: keywords
subject: biscuits
  topic: keywords
subject: gluten-free biscuits
  topic: keywords
creator: Marija Menkinoska
creator: Tatjana Pavlova
creator: Zhivka Goranova
creator: Angelina Sredovska Bozhinov
creator: Zlatin Zlatev
creator: Hyrije Koraqi
creator: Anka Trajkoska Petkoska
rights: Copyright (c) 2023 Marija Menkinoska, Tatjana Pavlova, Zhivka Goranova, Angelina Sredovska Bozhinov, Zlatin Zlatev, Hyrije Koraqi, Anka Trajkoska Petkoska https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241014021M

COMPARATIVE ANALYSIS OF MORINGA OIL AND RUBBER SEED OIL BIODIESELS IN DIESEL ENGINES
type: item
description: Energy resources are diminishing, and environmental problems are becoming more prevalent. In this regard, biodiesel from moringa oil (MO) and rubber seed oil (RSO) promises to be an excellent alternative to diesel fuels, while also requiring far less modification from existing diesel engines. Performance metrics analysis reveals that biodiesel consumes a slightly higher amount of fuel at lower loads because of its relatively lower calorific value. At 4.4 kW, MO methyl ester blend (MO20) achieved a brake thermal efficiency of 30%, outperforming diesel (26%) and RSO methyl ester blend (RB20) achieved a brake thermal efficiency of 28%. MO20 reduced CO emissions by 60% compared to diesel and 55% compared to RB20. Furthermore, MO20 increased NOx emissions by 10% at higher brake power levels compared to RB20 and 20% for diesel. RB20 and MO20 biodiesel blends exhibit lower HC compared to diesel by 24% and 28% respectively. These reductions in carbon monoxide and hydrocarbon emissions make biodiesel blends, mostly from MO, cleaner and well sustainable compared to conventional diesel, with their environmental and performance benefits for diesel engine applications.
subject: Article
  topic: section
subject: Biodiesel
  topic: keywords
subject: Biodiesel, diesel engine
  topic: keywords
subject: alternative fuel
  topic: keywords
subject: moringa oil
  topic: keywords
subject: rubber seed oil
  topic: keywords
subject: emissions
  topic: keywords
creator: Venkatesan Subramanian
creator: Raghu Palani
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241211018P

SPRAY DRYING OF PHOSPHATE-SOLUBILIZING BACTERIA FOR THE PRODUCTION OF NEW BIOFERTILIZERS
type: item
description: Phosphate-solubilizing bacteria represent a sustainable solution to cope with phosphorus unavailability in agricultural soil. However, the success of their application is highly dependent on multiple environmental factors, and a novel approach is needed for bioformulations. The present study aimed to evaluate the suitability of the spray drying method for encapsulation of phosphate-solubilizing bacteria Azotobacter chroococcum F14/2, Bacillus megaterium 11/3, and Pseudomonas putida P1. Three strains were characterized, grown under optimal conditions, and encapsulated as a whole medium-cell system using the spray drying method and maltodextrin as carrier material. The described procedure provided encapsulates with an average particle size below 5 μm, moisture content under 10%, and satisfactory powder properties. The cell viability of encapsulates (after storage) was in the following order: Bacillus megaterium 11/3 > Azotobacter chroococcum F14/2 > Pseudomonas putida P1. Additional protection during spray drying was most probably achieved by the presence of microbial exopolysaccharides, which opened the possibilities for further optimization of encapsulation procedures.
subject: Article
  topic: section
subject: Azotobacter
  topic: keywords
subject: Pseudomonas
  topic: keywords
subject: Bacillus
  topic: keywords
subject: encapsulation
  topic: keywords
subject: soil
  topic: keywords
creator: Steva M. Lević
creator: Jelena Jovičić-Petrović
creator: Milica Mirković
creator: Slavica Kerečki
creator: Kata Trifković
creator: Viktor Nedović
creator: Vera Raičević
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-08-27
publication date: 2025-08-27
doi: 10.2298/CICEQ241216017L

REMOVAL OF ISOPROPYL ALCOHOL FROM WASTEWATER USING MODIFIED BENTONITE BY Fe, Cu, AND Fe-Cu
type: item
description: Catalysts based on purified bentonite (Be) pillared with Fe3+ (BeFe), Cu2+ (BeCu), and Fe-Cu (BeFe/Cu) were synthesized from Algerian bentonite and used to treat isopropyl alcohol (IPA) by catalytic wet peroxide oxidation (CWPO) with H2O2 at 298 K. The BeFe showed higher activity than the BeFe/Cu one for IPA removal, although the second was more active for H2O2 decomposition. The reaction kinetics were examined with both catalysts using the pseudo-first-order reaction model. The mechanism of H2O2 decomposition was known through different values of apparent activation energy (Ea) were determined from the Arrhenius equation 46 kJ/mol for BeFe with abundant formation of •OH radicals and 67 kJ/mol for BeFe/Cu with mainly production of O2 which has a low oxidation capacity at 298 K.
subject: Article
  topic: section
subject: Isopropyl alcohol oxidation
  topic: keywords
subject: Pillared clays
  topic: keywords
subject: Cu
  topic: keywords
subject: Fe
  topic: keywords
subject: Fe-Cu
  topic: keywords
creator: Zohra Mecabih
rights: Copyright (c) 2023 Zohra Mecabih https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241227016M

Analyzing the efficacy and exhausts of punnai biodiesel-ethanol blends in nanocoated ci engines
type: item
description: This study experimentally investigates the performance, emission, and combustion characteristics of a nano-coated compression ignition (CI) engine fueled by Punnai biodiesel blends with varying proportions of ethanol. The nano-coating was applied to the engine's cylinder liner and piston crown to enhance heat transfer and reduce friction. The biodiesel blends were prepared by mixing Punnai oil with diesel fuel in various ratios (B20, and B30). Ethanol was added to each blend at 5% and 15% concentrations. This research desires to improve the operational efficiency of an engine which runs on a diesel, through the utilisation of a piston coated with a thermal barrier, specifically tailored for punnai methyl ester blends. Thermal barrier coatings widely prioritise zirconia due to its exceptional thermal insulation properties. B20E15 has a brake thermal efficiency that exceeds that of diesel by around 3%. Similarly, B20E05 and B20E15 demonstrate fuel consumption reductions of approximately 3.8% and 16.3%, respectively. On average, the B20 blends exhibited a reduction in CO and HC emissions are 5% and 9%. A comparative analysis clearly demonstrated that nanocoated CI engines enhance performance and diminish emissions without any major modifications.
subject: Article
  topic: section
subject: Punnai biodiesel
  topic: keywords
subject: ethanol
  topic: keywords
subject: nano- coating
  topic: keywords
subject: diesel engine
  topic: keywords
subject: efficacy
  topic: keywords
subject: exhausts
  topic: keywords
creator: Narendranathan Srinivasan Kasinathan
creator: Karthikeyan Subramanian
creator: Purushothaman Panneerselvam
creator: Srinivasan Tirupathi
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241009015S

The impact of heat storage material integration in an evacuated tube collector
type: item
description: This experimental research assessed the impacts of sensible and latent heat materials such as SAE 20W/40 (used engine oil), candelilla wax (CLW) and rice bran wax (RBW) in an evacuated tube solar air heater. Four distinct arrangements were studied: one without a thermal energy storage material (TESM), one with a sensible heat material (SHM), and two with latent heat materials (LHM), to enable comparative analysis. The maximum outlet temperature of air for ETC filled with engine oil was 108°C, for CLW 115°C and for RBW 133°C – all measured at 13:00 pm. However, without filling the TESM in the ETC, the outlet temperature was only 70 °C. The maximum temperature difference of air in the RBW material-filled ETSAH system was 94°C, whereas without TESM, the temperature was only 31°C at 13:00. The maximum efficiency of the ETSAH system was achieved when using RBW as a PCM rather than both CLW and used engine oil-filled TESM. Moreover, the efficiency of the system increases around 1.7 - 1.8 times when the velocity of air increases from 1.5 to 2.5 m/s.
subject: Article
  topic: section
subject: Evacuated tube collector
  topic: keywords
subject: latent heat
  topic: keywords
subject: sensible heat
  topic: keywords
subject: thermal storage material
  topic: keywords
subject: rice bran wax
  topic: keywords
subject: candellila wax
  topic: keywords
creator: Rajasekar Chockkalingam
creator: Rameshkumar Ramasamy
creator: Barathiraja Rajendran
rights: Copyright (c) 2023 Rajasekar Chockkalingam, Rameshkumar Ramasamy, Barathiraja Rajendran https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241024014R

Investigating the acidity effect of niobia as catalytic support for furfural conversion
type: item
description: As niobia (Nb2O5) is an accessible acid support in Brazil, the objective of this work was to evaluate the effect of acidity in Ni/Nb2O5 catalysts for the hydrogenation of furfural in liquid phase. Catalysts with 5, 10 and 15 wt% Ni content were prepared by wet impregnation, activated under H2 flow, and tested in furfural hydrogenation at 150°C and 5 MPa of H2. N2 physisorption results suggest pore blocking on the support as the amount of Ni increased. The larger crystallites identified in XRD for 15% Ni/Nb2O5 probably favored pore blocking, and the atomic composition in EDS versus XPS indicates a lower metallic dispersion for this solid. TPR and XPS results suggest all Ni catalysts are primarily constituted of reduced Ni species, while TPD-NH3 confirms that the acidity of the support was passed on to the catalysts. The 15 wt% Ni solid led to a slight decrease in activity, which can be related to its lower dispersion. Catalysts proved to be promising in terms of selectivity to furfuryl alcohol, which remained between 60 and 80% throughout the reaction. Also, acid sites-derived product difurfuryl ether was produced with all catalysts, and can be an interesting addition to the biorefineries portfolio.
subject: Article
  topic: section
subject: Hydrogenation
  topic: keywords
subject: biorefinery
  topic: keywords
subject: metallic loading
  topic: keywords
subject: nickel
  topic: keywords
subject: niobium oxide
  topic: keywords
subject: difurfuryl ether
  topic: keywords
creator: Mayra Martinelli Costa
creator: Eduarda Caroline Duarte Amatte Coelho
creator: Silvia Fernanda Moya
creator: Raphael Soeiro Suppino
rights: Copyright (c) 2023 Mayra Martinelli Costa , Eduarda Caroline Duarte Amatte Coelho , Silvia Fernanda Moya , Raphael Soeiro Suppino https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241019013C

Grape pomace extract as a colorant for textile printing applications
type: item
description: The growing need to reduce the negative impact on the environment and human health, as well as to meet the growing demand for eco-friendly textiles, has led to the development of environmentally friendly printing techniques and the use of natural dyes in the textile industry. Grape pomace is important waste material in winemaking, and has been extensively studied for its potential as a source of compounds with biological properties, especially anthocyanins, pigments responsible for the red, purple, and blue colors in grapes. The aim of this paper was to examine the potential use of natural dye extracted from grape pomace of domestic cultivar crna Mirisavka (GPCM) in preparation of printing paste with alginate, citric acid, and tannic acid for printing on cotton fabric. Special focus was placed to achieve process color magenta, by adjusting the pH value of the extract obtained. The natural dye from GPCM was extracted using maceration with 80% methanol, followed by sonication to enhance the yield of bioactive compounds. GPCM extract demonstrated significant antioxidant activity measured by FRAP, DPPH, and ABTS+ tests, and moderate antibacterial activity against Staphylococcus aureus and Escherichia coli. The pH-dependent stability of anthocyanins in GPCM extract was examined, demonstrating a magenta tone at acidic pH (pH 2-4) and color degradation at higher pH values. Cotton fabric printed with two different concentrations of GPCM extract (100 mg/L and 50 mg/L) showed good antioxidant and antibacterial activity. Based on the obtained results, it can be concluded that GPCM extract can be an environmentally friendly solution for the development of antibacterial and antioxidant textiles, with potential application in the production of protective clothing in healthcare institutions, as well as for the production of decorative home textiles, for the production of children's toys and textiles for packaging.
subject: Article
  topic: section
subject: Grape pomace extract
  topic: keywords
subject: antibacterial activity
  topic: keywords
subject: antioxidant properties
  topic: keywords
subject: anthocyanins
  topic: keywords
subject: pH stability
  topic: keywords
subject: screen printing
  topic: keywords
creator: Branka Ružičić
creator: Dragana Grujić
creator: Aleksandar Savić
creator: Ljiljana Topalić-Trivunović
creator: Ana Velemir
creator: Blanka Škipina
creator: Sandra Dedijer
creator: Miljana Prica
rights: Copyright (c) 2023 Branka Ružičić, Dragana Grujić, Aleksandar Savić, Ljiljana Topalić-Trivunović, Ana Velemir, Blanka Škipina, Sandra Dedijer, Miljana Prica https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ250113012R

Involvement of aminoalkylated merrifield resins retracted by bis(chlorodiethyl) ether in metal extraction
type: item
description: Merrifield resin, a cross-linked polystyrene resin with chloromethyl functional groups, is an extremely resilient material resistant to water and environmental degradation. Our objective is to develop novel substituted polymers with functional groups capable of chelating heavy metals for depollution applications. Cross-linked polymer networks, which are predominantly insoluble and adaptable to diverse chemical environments, are invaluable for pollution management. A key area of environmental significance is the selective retention of organic contaminants for purifying polluted water sources. This work focuses on creating new chelating polymeric sorbents for metal extraction by grafting ethylenediamine (EDA) and triethylenetetramine (TETA) onto Merrifield resin, resulting in two polymers: MR-EDA and MR-TETA. These modified polymers are further reticulated with bis(chlorodiethyl) ether to produce two novel reticulated polymers, MR-TETA-BCEE and MR-EDA-BCEE.To characterize the polymers, differential thermal analysis (DTA) and infrared (IR) spectroscopy are employed. The resins are subsequently tested for their ability to extract lead (Pb²⁺) and lithium (Li⁺) ions from aqueous solutions using the solid-phase extraction (SPE) method. Conductivity and atomic absorption spectrometry (AAS) analyses demonstrate high extraction efficiencies, ranging from 50% to 85% for both Pb²⁺ and Li⁺ ions. These results demonstrate the potential of MR-EDA-BCEE and MR-TETA-BCEE as effective polymeric sorbents for environmental remediation and heavy metal removal from water.
subject: Article
  topic: section
subject: Merrifield resin
  topic: keywords
subject: ethylenediamine
  topic: keywords
subject: chlorodiethyl
  topic: keywords
subject: metal extraction
  topic: keywords
creator: Marwa Mrabet
creator: Adnen Mabrouki
creator: Fayçel Ammari
rights: Copyright (c) 2023 Marwa Mrabet, Adnen Mabrouki, Fayçel Ammari https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ240814011M

Dye degradation using piperazine encapsulated biosynthesized iron nanoparticles
type: item
description: This study investigates the breakdown of aniline yellow dye using biosynthesized iron nanoparticles that uses extract from Eryngium billardieri. Piperazine encapsulation in a chlorinated environment increased degradation efficiency, reaching up to 92% in the dark and 96% under photocatalytic conditions. Ultraviolet-visible spectroscopy (331.24 nm, 243.19 nm), Fourier Transform Infrared Spectroscopy (Fe–O at 539 cm⁻¹, C–N at 1231 cm⁻¹), X-ray Diffraction analysis (peaks at 26.31° to 76.84°, indicating FCC structure), and Energy Dispersive Spectroscopy (Fe and Cl presence) were used to characterize the nanoparticles. The N-functionalities produced from piperazine and Fe2+ (712 eV) were validated by X-ray Photoelectron Spectroscopy. Spherical, evenly distributed particles (10–30 nm) with core-shell morphology were seen by Field Emission Scanning Electron Microscopy and High Resolution Transmission Electron Microscopy. After encapsulation, Photoluminescence analysis showed less electron-hole recombination. Mesoporosity (type IV isotherms) was revealed by Brunauer-Emmett-Teller analysis, and the piperazine coating reduced surface area. Superparamagnetic behaviour with a blocking temperature close to 35K was found via magnetic measurements. High stability, catalytic efficiency, and potential for environmental remediation were all displayed by the encapsulated iron nanoparticles.
subject: Article
  topic: section
subject: Dye degradation
  topic: keywords
subject: Eryngium billardieri
  topic: keywords
subject: iron nanoparticles
  topic: keywords
subject: photocatalysis
  topic: keywords
subject: piperazine
  topic: keywords
creator: Sathiya Selvaraj
creator: Durairaj Sankaran
creator: Ilangkumaran Mani
rights: Copyright (c) 2023 Sathiya Selvaraj, Durairaj Sankaran, Ilangkumaran Mani https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ240904010S

Potential application as a bio-coagulant for Moringa oleifera seeds
type: item
description: This study focused on producing a natural bio-coagulant from moringa seeds. Moringa seed extract is a natural coagulant for the treatment of water containing suspended solids and colloids and is obtained through grinding, oil extraction, protein extraction from the solids using 2 M NaCl solution, protein separation by centrifugation followed by filtration. This study investigated the production and use of bio-coagulants. Parameters investigated when producing the bio-coagulant include the effects of temperature on the removal of moisture content in the moringa seeds, the type of solvent on the oil yield, and varying the volume of n-hexane for oil extraction. Parameters investigated when using the bio-coagulant include the effect of dosage of bio-coagulant on pH and turbidity removal efficiency, and the performance of the bio-coagulant at low, medium, and high turbidity levels. The optimum temperature and time obtained by drying the moringa seeds was at 100 °C for 30 min and the highest oil yield obtained was 31% when using n-hexane as the solvent. Turbidity removal efficiency went up to 96.4 % when using 50 mg/L of the bio-coagulant at a pH of 6.1. High turbidity removal was achieved at low bio-coagulant dosages which was regarded as a breakthrough finding for this research.
subject: Article
  topic: section
subject: Moringa oleifera seeds
  topic: keywords
subject: n-hexane
  topic: keywords
subject: bio-coagulant
  topic: keywords
subject: water treatment
  topic: keywords
creator: Amanda Zviuya
creator: Joseph Govha
creator: Placxedes Sigauke
creator: Tirivaviri A. Mamvura
creator: Gwiranai Danha
rights: Copyright (c) 2023 Amanda Zviuya, Joseph Govha, Placxedes Sigauke, amvurat@biust.ac.bw Mamvura , Gwiranai Danha https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ240313008Z

Novel Achillea wilhelmsii C. Koch nanocomposite fabrication with extraordinary physical and chemical properties
type: item
description: In this paper, we utilized two techniques, steam extraction and Soxhlet extraction, to obtain the active components of Achillea wilhelmsii C.Koch. These active substances were then used to create composite nanofibers using an electrospinning machine. The morphology of the resulting nanocomposite was examined using a FESEM, and the results demonstrated that the electrospinning method and conditions were suitable. Additionally, we investigated and analyzed the anti-inflammatory efficacy of the nanocomposite produced through both methods. Furthermore, we compared and analyzed the strength, abrasion resistance, moisture content, and water supply of the samples we produced according to certain standards. Overall, the nanocomposite derived from Achillea wilhelmsii C.Koch exhibited promising properties that could be utilized in various industries.
subject: Article
  topic: section
subject: Achillea wilhelmsii C.Koch
  topic: keywords
subject: composite
  topic: keywords
subject: nanofiber
  topic: keywords
subject: anti-inflammatory
  topic: keywords
subject: abrasion resistance
  topic: keywords
creator: Mahsa Mohamadiyan
rights: Copyright (c) 2023 Mahsa Mohamadiyan https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ240803009M

List of Referees July 2024 to April 2025
type: item
description: List of Referees
subject: Editorial
  topic: section
subject: -
  topic: keywords
creator: -
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-04-16
publication date: 2025-04-16

Author Index
type: item
description: Author Index
subject: Editorial
  topic: section
subject: -
  topic: keywords
creator: -
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-04-16
publication date: 2025-04-16
starting page: 337
ending page: 339

Contents: Issues 1—4
type: item
description: Contents: Issues 1—4
subject: Editorial
  topic: section
subject: -
  topic: keywords
creator: -
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-04-16
publication date: 2025-04-16
starting page: 335
ending page: 336

Effect of hot air and hot air assisted microwave drying on drying kinetics and quality of red and white pitaya slices
type: item
description: In this study, mathematical modelling, drying kinetics, rehydration ratio (RR), shrinkage ratio (SR), color change (∆E), total phenolic content (TPC), antioxidant activity (AA) and microstructural examination of red and white pitaya fruits dried by hot air drying (HAD) and hot air assisted microwave drying (HA-MWD) methods were conducted. In the HAD and HA-MWD methods, the effective diffusion coefficient (Deff) increased as the drying time shortened. While the Page model provides the best fit to HA-MWD curves, HAD curves are also appropriately defined by the Parabolic Model. The RR value was found to be higher in the HA-MWD method. TPC values of fresh red and white pitaya fruits were calculated as 389.71±0.80 and 310.11±0.42 mg GAE 100 g-1 DM, respectively. The highest TPC value in HA drying was determined as 251.35±0.35 mg GAE 100 g-1 DM at 70 °C. In the HA-MWD method, TPC and AA decreased due to the increase in microwave power. In SEM monitoring, it was observed that crack and pore sizes increased with the temperature increase in HAD for both fruit types. The increase in microwave power caused more damage to the structure in the HA-MWD method.
subject: Article
  topic: section
subject: Pitaya
  topic: keywords
subject: drying
  topic: keywords
subject: effective diffusion
  topic: keywords
subject: mathematical modelling
  topic: keywords
subject: microstructure
  topic: keywords
creator: Pınar Şengün
creator: Çetin Kadakal
rights: Copyright (c) 2023 Pınar Şengün, Çetin Kadakal https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ241107007S

Slot milling of AA7075 reinforced with nano silicon carbide particles – an experimental and finite element approach
type: item
description: In the current trend, industries prefer to optimise machining processes using finite element-based machining simulation techniques. Aluminium alloy 7075 (AA7075) strengthened with nano Silicon Carbide particles (nSiCp) is utilized by industries as they exhibit good physical and mechanical properties. Slot milling is the essential machining operation to convert the component to the designed shape and size. However, excellent knowledge is required in selecting the appropriate machining parameters such as cutting velocity, feed and cutting tool material to ensure the quality of the components milled. In this research work, slot milling operation is carried out in the sample plates of AA7075 fortified with nSiCp content to 1.5 % of the weight. A 3D Finite Element Model (3D FEM) is developed using ABAQUS software for simulating slot milling operations to understand the influence of machining parameters on cutting forces, chip formation and chip morphology. The cutting force signals predicted by 3D FEM correlates 85 to 90 % with experimental data. The maximum shear stress of 175 MPa and Von Mises stress of 459 MPa were observed at the tool-workpiece interface. This validated 3D FEM facilitate to visualize and investigate the milling process and assists in selecting appropriate machining parameter settings. The effects of cutting velocity and feed on cutting forces, chip characteristics, stress and chip formation are reported.
subject: Article
  topic: section
subject: Aluminium nanocomposite
  topic: keywords
subject: Slot milling
  topic: keywords
subject: 3D FEM
  topic: keywords
subject: cutting forces
  topic: keywords
subject: chip morphology
  topic: keywords
creator: Prakash Chakrapani
creator: Prakash Jayaraman
rights: Copyright (c) 2023 Prakash Chakrapani, Prakash Jayaraman https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ240826006C

Synthesis and characterization of activated carbon produced from hazelnut peels by chemical activation
type: item
description: Activated carbon was prepared in this research from hazelnut (Corylus avellana) peels with some additives which included polymeric waste (polymethyl methacrylate PMMA) and the raw material was ground to facilitate handling and different amounts of sodium hydroxide were added to it and the ratio [Corylus avellana peels: NaOH] was as follows: 1:0.5 to 1:2.5. (Corylus avellana) peels were also treated with polymeric waste materials at ratios of 5 - 25 % and a basic ratio of 1:2 at a temperature of 550 °C as it is considered an environmental pollutant and then part of it was disposed of by preparing a material with great economic feasibility. Then the adsorption properties of the prepared samples (methylene dye), iodine number, density, humidity and yield were evaluated and compared with the British and Russian commercial models, and (SEM, FT-IR) techniques were used to characterize the prepared activated samples. The results showed that activated carbon samples prepared from hazelnut peels were characterized by high iodine number (894.521 mg/g), methylene blue dye adsorption capacity (98.425 mg/g) and the yield (14.973 %).. As for the samples prepared from hazelnut peels with PMMA an increase was observed in the iodine values (1015.021 mg/g ) and adsorption capacity for methylene blue dye reached (148.000 mg/gm ) and yield also increased. This indicates that the addition process was a positive step in improving the specifications and productivity of activated carbon. As for the density and ash, humidity values, they were within the permissible limits for all the prepared activated carbon samples, and thus they greatly exceeded the specifications of commercial carbon samples
subject: Article
  topic: section
subject: Carbonation
  topic: keywords
subject: polymeric waste
  topic: keywords
subject: polymethyl methacrylate
  topic: keywords
subject: methylene blue dye
  topic: keywords
subject: physical properties
  topic: keywords
creator: Semaa Ibraheem Khaleel
rights: Copyright (c) 2023 Semaa Ibraheem Khaleel https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-28
publication date: 2025-07-28
doi: 10.2298/CICEQ240807005K

INTENSIFIED MICROWAVE-ASSISTED HYDRODISTILLATION PRODUCES TRANS-ANETHOLE-RICH FENNEL (Foeniculim vulgare Mill.) FRUIT ESSENTIAL OIL
type: item
description: Fennel fruit (Foeniculim vulgare Mill.) essential oil (FFEO) was isolated from disintegrated plant material by intensified microwave-assisted hydrodistillation approach (MWHD). Isolated FFEO, rich in trans-anethole and low in estragol, was obtained with a 30% higher yield after only 10 min compared to the FFEOs isolated via traditional hydrodistillation (HD). Besides significant differences in the chemical composition, the MWHD-obtained FFEO demonstrated superior antibacterial activity, while its anticandidal activity remained unchanged and identical to HD-obtained FFEOs. MWHD technique also required almost 18 times less electricity consumption and emitted less CO2 than the conventional HD, suggesting this approach is more viable for FFEO production on an industrial level. According to these results, the MWHD-obtained FFEO has the potential to be used in the food industry and packaging, for the production of nutraceuticals, biopharmaceuticals, bioherbicides, and cosmetics.
subject: Article
  topic: section
subject: Antimicrobial activity
  topic: keywords
subject: essential oil
  topic: keywords
subject: fennel fruit
  topic: keywords
subject: Foeniculi aetheroleum
  topic: keywords
subject: grinding
  topic: keywords
subject: microwave-assisted hydrodistillation
  topic: keywords
creator: Dušica P Ilić
creator: Dragan Z. Troter
creator: Jelena S. Stanojević
creator: Dragan J. Cvetković
creator: Ivan S. Ristić
rights: Copyright (c) 2023 Dušica P Ilić, Dragan Z. Troter, Jelena S. Stanojević, Dragan J. Cvetković, Ivan S. Ristić https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-07-24
publication date: 2025-07-24
starting page: 325
ending page: 333
doi: 10.2298/CICEQ240807004I

USE OF AN INTERNAL LOOP AIRLIFT BIOREACTOR TO PRODUCE POLYHYDROXYALKANOATES BY Stenotrophomonas rhizophila
type: item
description: Airlift-type bioreactors present advantages over conventional systems such as efficient mass transfer, simplicity of construction, and low energy consumption. Thus, they are a good alternative for the production of polyhydroxyalkanoates (PHAs) nevertheless, their use for that purpose has been barely studied. This work addresses the design, construction, and hydrodynamic characterization of a 2.4 L internal loop airlift bioreactor, evaluating the effect of the airflow, liquid volume, and disperser position, on the interfacial area and the mixing time. Then, it was used for the fed-batch production of PHB by Stenotrophomonas rhizophila from sugar cane molasses. It was found that the conditions to increase the interfacial area and minimize the mixing time were: airflow of 1.5 vvm, liquid volume of 2400 mL, and disperser position of 5 mm (distance between the air disperser and the drag tube). Under that configuration, the maximum biomass concentration, PHB production, and PHB accumulation achieved (54 h of culture) were 65.4 g/L, 39.9 g/L, and 60.2 % (g of PHB/100 g dry biomass), respectively. The polymer was poly-3-hydroxybutyrate, with a melting temperature of 170 °C, crystallinity of 56.4 %, and a Mw of 735 kDa.
subject: Article
  topic: section
subject: Airlift bioreactor
  topic: keywords
subject: polyhydroxyalkanoates
  topic: keywords
subject: molasses
  topic: keywords
subject: Stenotrophomonas rhizophila
  topic: keywords
creator: Berenice Clifton-García
creator: Juan Villafaña-Rojas
creator: Orfil González-Reynoso
creator: Jorge Ramon Robledo-Ortiz
creator: Ricardo Manríquez-González
creator: Porfirio Gutiérrez-González
creator: Yolanda González-García
rights: Copyright (c) 2025 Berenice Clifton-García, Juan Villafaña-Rojas, Orfil González-Reynoso, Jorge Ramon Robledo-Ortiz, Ricardo Manríquez-González, Porfirio Gutiérrez-González, Yolanda González-García https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-03-03
publication date: 2025-03-03
starting page: 71
ending page: 82
doi: 10.2298/CICEQ230819014C

QUALITY RESTORATION OF WASTE POLYOLEFIN PLASTIC MATERIAL THROUGH THE DISSOLUTION-REPRECIPITATION TECHNIQUE
type: item
description: We wish to inform our readers that concerns have been raised regarding the integrity of the data presented in paper QUALITY RESTORATION OF WASTE POLYOLEFIN PLASTIC MATERIAL THROUGH THE DISSOLUTION-REPRECIPITATION TECHNIQUE (Chem. Ind. Chem. Eng. Q., 2014, 20; 163−170; https://doi.org/10.2298/CICEQ120526119H), specifically the duplication of images in Figures 1 and 2, which appear identical despite representing different materials. The issue has been flagged as a potential data integrity problem, and we are currently investigating the matter in collaboration with the authors.
subject: Editorial
  topic: section
subject: Expression of concern
  topic: keywords
creator: Vlada B. Veljković
rights: Copyright (c) 2025 Vlada B. Veljković https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-03-03
publication date: 2025-03-03
starting page: 93
ending page: 93
doi: 10.2298/CICEQ250109001E

REACTION PARAMETER OPTIMIZATION OF AMMONIUM SULFATE PRODUCTION FROM PHOSPHOGYPSUM
type: item
description: Phosphogypsum (PG), the by-product of wet process phosphoric acid production, has a high recycle and reuse potential within the scope of compliance with CE strategies. This study offers a straightforward, two-step solid/liquid heterogeneous reaction sequence, providing the conversion of PG to ammonium sulfate (AS). Experiments were conducted following the OFAT design matrix with 3 factors, namely solid/liquid (w/v) ratio, pH, and particle size. The highest PG to AS conversion was achieved at 54.55% by utilizing PG below 125 µm particle size in the reaction performed with 1/10 solid/liquid (w/v) ratio at pH 10. Nitrogen and sulfur content of AS samples were characterized by Dumas Method and gravimetric SO4 (ISO 9280:1990) analysis, respectively. The elemental composition was determined by ICP-OES, the crystallographic structure was investigated by XRD analysis, and the surface morphology of the particles obtained in the reaction was examined by SEM analysis. The chemical composition of AS product obtained at these conditions was determined as 21.29 wt% nitrogen and 24.23 wt% sulfur, respectively; where theoretical nitrogen and sulfur content in AS is 21.21 wt% and 24.24 wt%, respectively. This study provides outputs that have industrial importance since it proposes a novel approach for effective waste valorization and a new insight into AS production in the current fertilizer shortage.
subject: Article
  topic: section
subject: Ammonium sulfate
  topic: keywords
subject: circular economy
  topic: keywords
subject: wet conversion
  topic: keywords
subject: phosphogypsum
  topic: keywords
subject: resource recovery
  topic: keywords
creator: Cemre Avşar
creator: Suna Ertunç
rights: Copyright (c) 2025 Cemre Avşar, Suna Ertunç https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-03-03
publication date: 2025-03-03
doi: 10.2298/CICEQ231130013A

THE INFLUENCE OF VIBRATION VELOCITY ON THE NANOCOMPOSITE OF HALLOYSITE CLAY NANOTUBES
type: item
description: This research examined the properties of a nanoweb created using the electrospinning technique, incorporating Halloysite clay nanotubes. The main focus was to understand how different vibration speeds affected the characteristics of the nanoweb. By utilizing FESEM and elemental mapping, it was confirmed that the Halloysite clay nanotubes were present and provided valuable insights into the structure of the samples. The results regarding electrical conductivity were remarkable, showing that the treated specimens had higher crease recovery properties compared to the untreated ones(more than 24%), thanks to the presence of Halloysite clay nanotubes and the different vibration speeds applied. In addition, the samples showed improved UV blocking capabilities up to about 75%, as well as exceptional strength (~33%) and abrasion resistance (~93%). Overall, the nanocomposite webs exhibited promising qualities that could have applications in various industries.
subject: Article
  topic: section
subject: Clay nanotubes
  topic: keywords
subject: vibration speed
  topic: keywords
subject: electrospinning
  topic: keywords
subject: nano web
  topic: keywords
creator: Behrooz Sedighi
creator: Abolfazl Davodiroknabadi
creator: Mohammad Shahvaziyan
creator: Mohammadali Shirgholami
rights: Copyright (c) 2023 Behrooz Sedighi, Abolfazl Davodiroknabadi, Mohammad Shahvaziyan, Mohammadali Shirgholami https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-04-16
publication date: 2025-04-16
starting page: 315
ending page: 323
doi: 10.2298/CICEQ240712003S

FORECASTING RESEARCH OF MIXING UNIFORMITY OF CERIUM CHLORIDE SOLUTION UNDER MICROWAVE HEATING
type: item
description: Cerium oxide is an important strategic resource and a key raw material for many functional materials in high-tech fields. Microwave heating is an important method to prepare cerium oxide. In the study of cerium oxide prepared by microwave heating, the variation of the polarity factor inside the solution during heating was explored. In addition to thermal effects, microwave heating also exerts electromagnetic influences that promote the mixing of the solution. This study presents both physical experiments and numerical simulations of the mixing behavior of cerium chloride solutions under microwave exposure. The results reveal that under the influence of the microwave electromagnetic field, the mixing uniformity of the solution remains consistent and stable across the entire region. The VMD-SSA-LSTM model was proposed to forecast the mixing uniformity under different process conditions. The results show that the mixing effect of cerium chloride solution under microwave is better than that under conventional heating. The selected forecast model saves time and energy and can accurately forecast the above situation. In addition, the forecast effect is best when the modal number k of VMD decomposition is selected as 3.
subject: Article
  topic: section
subject: Cerium oxide
  topic: keywords
subject: physical experiment
  topic: keywords
subject: numerical simulation
  topic: keywords
subject: VMD-SSA-LSTM
  topic: keywords
subject: forecast
  topic: keywords
creator: Chao Lv
creator: Yanlong Liu
creator: Lu Lu
rights: Copyright (c) 2023 Chao Lv, Yanlong Liu, Lu Lu https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-04-16
publication date: 2025-04-16
starting page: 305
ending page: 314
doi: 10.2298/CICEQ240712002L