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Iqbal Syaichurrozi
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World Chemical Engineering Journal
Published by Universitas Sultan Ageng Tirtayasa
ISSN : -     EISSN : 24432261     DOI : https://dx.doi.org/10.62870/wcej.v8i1.26617
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering
WCEJ publishes original papers and reviewed papers on the fundamental, theoretical as well as applications of Chemical Engineering. WCEJ is published two times a year. This journal covering some aspects of chemical engineering, which are environmental chemical engineering, chemical reaction engineering, bioprocess-chemical engineering, materials synthesis and processing.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 92 Documents
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Analysis of Biogas Production Kinetics from Cow Dung and Food Waste Puspitasari, Sasikirana; Amanda, Syahla; Prasetyawati, Eka; Syaichurrozi, Iqbal
World Chemical Engineering Journal VOLUME 9 NO. 1 JUNE 2025
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v9i1.33629

Abstract

The increasing volume of organic waste, such as cow dung and food waste, is a significant environmental problem. One potential solution is the utilization of these wastes as raw materials for biogas production through anaerobic processes. This study aims to analyze the rate of biogas production from a mixture of cow dung and food waste with a kinetic approach using three mathematical models: First-Order, Gompertz, and Logistic. The volume of biogas produced was measured periodically and analyzed using the three models to determine kinetic parameters such as the maximum rate of biogas production and time. Using secondary data from previous studies, three kinetic models, namely Gompertz, First Order, and Logistic, were applied to predict biogas. The best modeling results that have been obtained are in Logistic modeling. In this modeling, the SSE value of cow dung is 58.62 mL and potential biogas peoduction is 167.12 mL,  lag phase period is 3.82 mL and maximum biogas production is 15.91 mL.
Analysis of Quality Control of Drawn Textured Yarn Using Six Sigma Method at Indorama Engineering Polytechnic Production Unit Ulum, Rikzan Bachrul; Agassi, Andre; Muchtar, Diki
World Chemical Engineering Journal VOLUME 9 NO. 1 JUNE 2025
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v9i1.33651

Abstract

Drawn textured yarn is one of the production outputs of the Vocational Training Center at Politeknik Enjinering Indorama, a partner of PT Indorama Synthetics Tbk. In its production process at the Vocational Training Center of Politeknik Enjinering Indorama, product defects are still encountered. To reduce product defects, the Six Sigma method with DMAIC approach is employed. For companies prioritizing product quality, quality control over the products must be conducted. This can manage and control the number of rejected or damaged products that could potentially harm the company's reputation in the eyes of consumers when the products are marketed.
Kinetic Analysis of Biogas Production from Cow Manure Waste Tsaqif, Farhan Fadlurohman; Erlina, Laras; Putra, Afshar Rehansyah; Akram, Felda; Syaichurrozi, Iqbal
World Chemical Engineering Journal VOLUME 9 NO. 1 JUNE 2025
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v9i1.33593

Abstract

Biogas is the result of decomposing organic waste that can be used as alternative energy. One of the organic waste that has the potential to produce biogas is livestock waste. The purpose of this scientific article is to see the results of kinetic models on secondary data processing of biogas volume acquisition/day. This scientific article was conducted by processing secondary data on biogas production at several pH variations (N1 = 7.17, N2 = 7.22, N3 = 7.24) using several kinetic models, namely the Gompertz model, logistic model, and first-order model. The best results are obtained in the logistic model, where the objective function value is the smallest. For each variation of N1, N2, and N3, the SSE values obtained are 458.37, 423, and 309. For the Gompertz and logistic models have the same graphical shape which is sigmoid-shaped or "s" shaped, which indicates that there are three phases in the formation of biogas, namely the pause phase, the rapid growth phase, and the stable growth phase. For the first-order model, it has a linear graph shape which states that in this model, there is a simplification of stages, namely only the hydrolysis stage which follows a first-order pattern.
Utilization of Agricultural and Organic Waste as Eco-Friendly Biomass-based Adsorbents Pujiastuti, Hendrini; Aziz, Sarah Rafidah
World Chemical Engineering Journal VOLUME 9 NO. 1 JUNE 2025
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v9i1.33760

Abstract

The development of effective and sustainable remediation techniques is required due to the growing environmental contamination brought on by industrial activities, especially from heavy metals and organic pollutants. The purpose of this review is to evaluate critically the potential of biomass-based adsorbents made from organic and agricultural waste for use in environmental remediation, specifically in the treatment of soil and water. The study assesses the surface properties, functional groups, and adsorption mechanisms of several bio-adsorbents and groups them according to their sources, including activated carbon, agricultural residues, and biochar. The impact of chemical and physical changes on improving adsorption performance is also thoroughly examined. The results show that these environmentally friendly materials have notable adsorption capacities and provide a sustainable, scalable, and affordable substitute for traditional synthetic adsorbents. The study adds to the expanding corpus of research that supports the circular economy's waste valuation principles and emphasises the usefulness of green environmental management techniques.
Kinetic Analysis of the Effect of pH on Biogas Production from Cow Manure Waste through Anaerobic Processes Priyatna, Aufa Irsyad; Firdaus, Alzena Nasywa; Sa'diyah, Siti Halimatu; Syaichurrozi, Iqbal
World Chemical Engineering Journal VOLUME 9 NO. 1 JUNE 2025
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v9i1.33625

Abstract

Biogas is the decomposition of organic waste by bacteria through an anaerobic fermentation process that can be managed to produce biogas in the form of methane gas (CH4). This study aims to analyze the effect of pH variation on biogas production through anaerobic digestion using a kinetic modeling approach. Using secondary data from previous studies, three kinetic models Gompertz, First Order, and Logistic were applied to predict biogas volume at acidic pH 4.52, neutral (6.80), and alkaline (8.52). Alkaline pH (8.52) resulted in the highest biogas production at 2850 mL. At pH 8.52, Gompertz parameters such as production potential (4,231.24 mL), maximum rate (163.19 mL/day), and shortest lag phase (3.92 days) indicated the highest efficiency.
Effect of Glycerol Concentration and Gelatinization Temperature on Beneng Taro (Xanthosoma undipes K. Koch) Starch/PVA Bioplastic Films Prepared by Solvent Casting Mella Herdini; Evi Triwulandari; Wardalia Wardalia
World Chemical Engineering Journal VOLUME 10 NO. 1 JUNE 2026
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i1.40702

Abstract

Bioplastics based on Beneng taro (Xanthosoma undipes K. Koch) starch were prepared using the solvent casting method with glycerol as a plasticizer and polyvinyl alcohol (PVA) as an additional polymer. This study aimed to evaluate the effects of glycerol concentration and gelatinization temperature on the mechanical, chemical, and thermal properties of starch-based bioplastic films. Films were prepared at starch:glycerol ratios of 60:40, 70:30, and 80:20 (w/w), with gelatinization temperatures of 75, 80, 85, and 90 °C. The amylose content of Beneng taro starch was 11%. Increasing glycerol concentration increased elongation at break from 10.30% to 29.04%, but decreased tensile strength from 5.13 MPa to 0.84 MPa. FTIR analysis indicated the presence of characteristic O–H, C–H, and C–O functional groups, suggesting hydrogen-bonding interactions among starch, glycerol, and PVA without the formation of new functional groups. DSC analysis showed melting temperatures in the range of 82–91 °C, with the highest thermal stability observed at a gelatinization temperature of 80 °C. These results indicate that glycerol concentration and gelatinization temperature strongly influence the flexibility, mechanical strength, and thermal behavior of Beneng taro starch-based bioplastic films.
Chitosan–Pectin Composite Film as a Biodegradable Coating for Extending Banana Shelf Life Nufus Kanani; Endarto Yudo Wardhono; Haroki Madani; Heri Heriyanto; Indar Kustiningsih; Wardalia Wardalia; Rusdi Rusdi; Rudi Hartono
World Chemical Engineering Journal VOLUME 10 NO. 1 JUNE 2026
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i1.40564

Abstract

Banana (Musa paradisiaca) is a climacteric fruit with a short postharvest shelf life due to rapid respiration, moisture loss, ethylene-induced ripening, peel browning, and microbial deterioration. Although synthetic plastic packaging can effectively reduce water loss, its non-biodegradable nature and potential to create unfavorable storage microenvironments encourage the development of sustainable bio-based coatings. This study investigated chitosan–pectin composite films as biodegradable coatings for banana preservation. Chitosan and pectin solutions were prepared using microwave-assisted extraction to improve dissolution homogeneity, followed by blending at various chitosan-to-pectin volume ratios. Glycerol was added as a plasticizer, and the resulting films were evaluated through weight loss analysis, visual observation, tensile testing, Fourier Transform Infrared spectroscopy, and Scanning Electron Microscopy. The results showed that coating application significantly reduced banana weight loss compared with uncoated samples. Synthetic plastic exhibited the strongest moisture barrier, but the chitosan–pectin formulation with a 50:50 ratio showed the best performance among bio-based coatings, reducing weight loss to 9.05%, 16.53%, and 19.44% on days 5, 10, and 15 of storage, respectively. Visual observation also indicated that the chitosan–pectin coating delayed peel browning and maintained better banana appearance up to 15 days. FTIR analysis confirmed intermolecular interactions between chitosan and pectin through shifts in O–H/N–H and C–N absorption bands, suggesting hydrogen bonding and electrostatic interactions. SEM images further revealed that pectin incorporation produced a more continuous and integrated film surface than chitosan alone. These findings demonstrate that chitosan–pectin composite coating, particularly at a 50:50 ratio, has strong potential as an environmentally friendly alternative to synthetic plastic for extending banana shelf life.
Experimental Investigation of the Effect of NaOH Concentration and Stirring Speed on CO₂ Capture Performance Muhammad Achdan Syahroni; Nuryoto Nuryoto; Heri Heriyanto
World Chemical Engineering Journal VOLUME 10 NO. 1 JUNE 2026
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i1.40729

Abstract

Carbon dioxide (CO₂) emissions from industrial and transportation sectors are major contributors to the greenhouse effect, driving global climate change. One of the promising mitigation methods is chemical absorption using alkaline solutions, which also enables the production of value-added products. This study aims to evaluate the effects of NaOH concentration and stirring speed on the performance of CO₂ absorption based on the resulting products. With high stirring speed and concentration, it is expected that more Na2CO3 will be formed than in previous studies. The resulting Na2CO3 product was then characterized using SEM and FTIR. Experiments were conducted at NaOH concentrations of 8–10 M, a temperature of 50°C, a CO₂ flow rate of 2 lpm, and stirring speeds ranging from 300 to 500 rpm. Process efficiency was determined based on the mass of Na₂CO₃ formed and the residual NaOH concentration. The results showed that the highest product mass, 218.90 g, was obtained at 10 M and 300 rpm. SEM and FTIR analyses confirmed that the produced material is consistent with the characteristics of Na₂CO₃. These findings provide complementary insights to previous studies for identifying effective, efficient, and economically viable operating conditions.
Coconut Shell Activated Carbon as a Sustainable Adsorbent for Gold Recovery from Aqueous Leaching Solutions: A Review Heri Heriyanto; Nufus Kanani; Hendrini Pujiastuti; Rusdi Rusdi
World Chemical Engineering Journal VOLUME 10 NO. 1 JUNE 2026
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i1.40169

Abstract

Gold recovery from dilute hydrometallurgical process liquors has become a strategic priority within circular-economy resource management and responsible precious-metal stewardship. Activated carbon dominates gold capture in industrial circuits, particularly in alkaline cyanide systems where the anionic dicyanoaurate complex, Au(CN)₂⁻, is the principal dissolved species; however, economic constraints and sustainability pressures have stimulated growing interest in biomass-derived alternatives. This review critically synthesizes the evidence base for coconut shell activated carbon as a sustainable, high-performance adsorbent for gold recovery from aqueous leaching media, encompassing feedstock selection, activation pathways, pore architecture, adsorption mechanisms, solution speciation in cyanide and cyanide-free systems, and kinetic and equilibrium modelling. The literature demonstrates that gold removal efficiencies of 87–89% are attainable under optimized cyanide-leachate conditions — alkaline pH, gentle agitation, 1.25 g/L adsorbent dose, and approximately 3 h contact — compatible with real processing environments. Feedstock maturity and activation protocol decisively govern adsorption rate, loading capacity, and mechanical integrity, confirming that material quality must be actively engineered. Equilibrium behaviour conforms to the Freundlich isotherm, reflecting energetically heterogeneous surface sites, while kinetics follow pseudo-first-order dynamics with intraparticle diffusion as a co-limiting resistance. Coconut shell activated carbon holds genuine promise as a low-cost, environmentally responsible adsorbent, contingent on deliberate optimization of pore structure, surface chemistry, elution efficiency, regeneration durability, and real-leachate selectivity.
Process Simulation of Low-Carbon Cement Production Using Wollastonite as a Limestone Substitute Sony Nugraha; Anton Irawan; Iqbal Syaichurrozi
World Chemical Engineering Journal VOLUME 10 NO. 1 JUNE 2026
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i1.38513

Abstract

The conventional limestone-based cement production process is widely recognized as one of the largest contributors to global carbon dioxide emissions. Carbon dioxide emissions are produced because of the calcination process of limestone, namely calcium carbonate, and high energy consumption. In the conventional cement manufacturing process, various efforts have been made to reduce the amount of carbon dioxide emissions produced, but these efforts have not yet reduced the amount of carbon dioxide emissions massively. A breakthrough step was made by using alternative raw materials, namely using silica rock to replace limestone, so that carbon dioxide emissions from the calcination process are not produced. This alternative production using silica rock uses a chemical approach where the process goes through the stages of leaching, separation, precipitation, dehydration, decomposition and clinkerization. Simulations focused on the leaching, separation and precipitation stages to predict the mass balance, solvent requirements and distribution of calcium and silica. The simulation results showed that the leaching stage conversion reached 99% at a temperature of 80oC and a retention time of 5 hours, while the precipitation stage conversion reached 99% at a temperature of 80oC and a retention time of 4 hours. Meanwhile, the potential reduction in carbon dioxide emissions reaches 70% because of the elimination of the calcination process, and the potential reduction in energy consumption in the rotary kiln unit reaches 60%. This study also provides an initial quantitative basis for developing a carbon-free cement production process.

Page 9 of 10 | Total Record : 92

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