cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Dessy Ariyanti
Contact Email
dessy.ariyanti@che.undip.ac.id
Phone
+62247460058
Journal Mail Official
j.reaktor@che.undip.ac.id
Editorial Address
Department of Chemical Engineering, Diponegoro University Jl. Prof. Soedarto SH Tembalang Semarang 50275
Location
Kota semarang,
Jawa tengah
INDONESIA
Reaktor
Published by Universitas Diponegoro
ISSN : 08520798     EISSN : 24075973     DOI : https://doi.org/10.14710/reaktor.xx.x.xx-xx
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Materials Science & Nanotechnology
Reaktor invites contributions of original and novel fundamental research. Reaktor publishes scientific study/ research papers, industrial problem solving related to Chemical Engineering field as well as review papers. The journal presents paper dealing with the topic related to Chemical Engineering including: Transport Phenomena and Chemical Engineering Operating Unit Chemical Reaction Technique, Chemical Kinetics, and Catalysis Designing, Modeling, and Process Optimization Energy and Conversion Technology Thermodynamics Process System Engineering and products Particulate and emulsion technologies Membrane Technology Material Development Food Technology and Bioprocess Waste Treatment Technology
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 540 Documents
 50   51   52   53   54 
A Brief Overview of Corrosion Prevention and Inhibition: Past, Current and Future Technologies Ahmad - Fauzan; Andri Cahyo Kumoro; Aprilina Purbasari; Kharis Yohan Abidin
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.109-115

Abstract

Corrosion is a process that degrades metal-based materials as a result of chemical reactions with their surrounding environment. For that reason, it causes serious problems across various industries, namely reduced material quality, increased maintenance costs, and extensive safety concerns. This paper presents a concise overview of corrosion prevention and inhibition methods, focusing on key strategies, such as material selection and the use of protective coatings, cathodic protection, and corrosion inhibitors. Furthermore, nano coatings, eco-friendly inhibitors, smart materials, corrosion modelling, and self-healing materials are also discussed as part of current advancements. In-depth understanding and appropriate implementation of these suggested methods are essential for extending material lifespan and improving operational efficiency of the overall industrial systems.            
A Comparative Review on Polyhydroxybutyrate (PHB) Production by Bacillus megaterium Using Different Substrates under Batch Fermentation Chintya Sinar Lumbantoruan; F.B.A. Fitriani
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.124-128

Abstract

The use of non-degradable plastics as packaging has led to significant environmental issues because they are resistant to degradation and contributes to environmental pollution. The application of biodegradable plastics offers a potential solution to this problem. Polyhydroxybutyrate (PHB) is an environmentally friendly thermoplastic polyester polymer that exhibits advantageous properties compared to conventional plastics, especially its biodegradability. The synthesis of PHB can be achieved through three main routes: synthetic polymerization, genetic engineering, and microbial fermentation. This paper aims to explore most suitable substrate used for PHB biosynthesis via batch microbial fermentation based on the highest yield. The microorganism employed in PHB biosynthesis was Bacillus megaterium, which utilized substrates, such as cheese whey, sugarcane molasses, glucose, and glycerol. The highest PHB yield, 8.29 g/L, was obtained when cheese whey was used as the substrate. These finding indicates that cheese whey provides an excellent nutrient source for PHB production.
Modification of Cuttlefish Bone-Derived CaO Catalyst via SrO Impregnation for Optimizing the Conversion of Waste Cooking Oil into Biodiesel Cut Rahmah Saputri; Muhammad Muhammad; Adi Setiawan
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.116-123

Abstract

This study investigates the utilization of waste cooking oil (WCO) as a biodiesel feedstock using a heterogeneous catalyst derived from cuttlefish bone. The catalyst was modified via Sr(NO₃)₂ impregnation at different composition ratios (98:2, 95:5, and 90:10 % w/v) to produce CaO–SrO catalysts, followed by chemical activation with NaOH (2, 4, and 6 g). Catalyst characterization was conducted using scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM–EDS) and X-ray diffraction (XRD) to examine surface morphology, elemental distribution, and crystalline phases. The results indicate that the catalyst with a 90:10 CaO–SrO composition and 6 g NaOH activation (C90S10–N6) exhibited the most homogeneous surface morphology, uniform Sr dispersion, and enhanced phase stability. Transesterification of WCO under a methanol-to-oil molar ratio of 9:1, catalyst loading of 1 wt%, and reaction time of 2 h resulted in a biodiesel yield of 95.5%. The produced biodiesel showed a density of 0.87 g/mL, water content of 0.64%, calorific value of 38.52 MJ/kg, and a reduction in free fatty acid (FFA) content from 2.84% to 1.71%. These findings demonstrate that SrO-modified CaO catalysts derived from cuttlefish bone are effective, sustainable, and economically viable for enhancing biodiesel production from waste cooking oil.
Production and Application of Carbon Dots from Sugarcane Bagasse-Derived-Lignin for Pb2+ Ion Detection Berlian Sitorus; Dionisius Rio; Intan Syahbanu; Seno Darmawan Panjaitan
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.100-108

Abstract

This study investigates the formation and application of carbon dots derived from sugarcane bagasse lignin for lead ion detection. Lignin was extracted from bagasse using an alkaline treatment followed by precipitation with sulfuric acid. The isolated lignin was converted into carbon dots through a hydrothermal process. Characterization revealed a 7 ± 4 nm particle size distribution and distinctive absorbance peaks at 236, 317, and 360 nm in UV-Vis spectroscopy. To test their application in lead detection, the carbon dots are exposed to Pb2+ ions in concentrations of 0.01, 0.1, 1, and 10 µM. The carbon dots exhibited a notable fluorescence quenching response in the presence of Pb2+ ions. Photoluminescence spectroscopy confirmed that lead ions interact with the carbon dots, reducing their emission intensity. These findings demonstrate the potential of lignin-derived carbon dots as effective sensors for Pb2+ ion detection.
Production of Food – Grade Liquid Smoke from Candlenut Shell through a Consecutive Pyrolysis – Distillation Process Sulhatun Sulhatun; Faisal Faisal; Satria Nanda; Syarifah Akmal; Tubagus Rayyan Fitra Sinuhaji
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.129-137

Abstract

Concerning the increasing demand for food-grade liquid smoke, this research focuses on liquid smoke purification through distillation to improve quality, in terms of color, odor, and chemical composition, while eliminating carcinogenic compounds such as tar residues. For that reason, this study aims to investigate the production of liquid smoke from candlenut shells using a 300 kg capacity pyrolizer. Pyrolysis was conducted at 350 – 400°C for 1 – 6 hours to produce liquid smoke. Distillation temperature and time were varied to examine their effect on liquid smoke quality. Based on the phenol content, an optimal pyrolysis condition was achieved at temperatures between 350 and 450°C for 3.5 hours from which the highest phenol content value (56.76% w/w) was obtained. In addition, distillation at 200°C for 40 minutes resulted in the highest distillate yield of 38.74% w/w, which corresponds to a phenol content of 73.42% w/w. Furthermore, heavy metal contamination tests revealed that mercury, arsenic, cadmium, and lead levels were well below their maximum tolerable limit for food additives. These results demonstrate that the distillation condition significantly influences the quality and yield of liquid smoke. 
Comparative Kinetic Modelling and Performance Evaluation Of Immobilized Media Using Zeolite and Biokeramic In an Anaerobic Fixed-Bed Reactor Treating Dairy Sludge Waste Harun Pampang; Maria Assumpta Nogo Ole; Dian Ranggina; Prisca Caesa Moneteringtyas
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.82403

Abstract

This study evaluates the performance of anaerobic fixed-bed reactors using two different immobilization media, natural zeolite and porous bioceramic, for treating dairy sludge waste. Kinetic modeling was performed using Monod, Contois, and Moser models, implemented by MATLAB to determine substrate degradation (sCOD) and methane production rates. The results indicated that for the zeolite media, the Moser model provided the best fit R2 of 0.9287 and RMSE of 500.12 mg/L with an exponential constant (n) of 2.92, reflecting high microbial sensitivity and synergistic effects in the biofilm. In contrast, the bioceramic media showed higher statistical stability across all models, with the Monod and Moser models achieving an identical R2 of 0.9939. However, a significant functional discrepancy was observed, while bioceramic provided superior statistical fitting, it failed to facilitate effective methanogenesis, with methane concentrations remaining below 10%. Zeolite, despite a slightly lower statistical fit, achieved a peak methane concentration of 37.82% on day 6. This suggests that zeolite's cation exchange capacity effectively mitigates ammonia inhibition from protein-rich dairy sludge, a factor not captured by simplified empirical deterministic kinetic models. This research emphasizes that statistical stability in kinetic modeling did not inherently correlate with bio-energy recovery efficiency, affrim the importance of media selection.
Assessment of TiO₂–C-dots Nanocomposites Derived from Tofu Liquid Waste for Post-Mining Soil Remediation: Its Application in Bengkulu Province Jhon Lucky Silalahi; Mokhammad Khatami
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.79958

Abstract

This paper critically evaluates the technological feasibility of producing TiO₂–carbon dots (C-dots) nanocomposites from tofu liquid waste as a biomass-derived carbon precursor for soil remediation in a post-mining environment. Rather than assuming conversion efficiency or economic viability, the analysis is structured around the synthesis routes, composite fabrication strategies, and process–structure–performance relationships curated from the relevant literature. Biomass-to-C-dots conversion pathways, including hydrothermal, microwave-assisted, and pyrolytic methods, are assessed with respect to feedstock tolerance, operational conditions, and product characteristics. Integration strategies between C-dots and TiO₂, namely in situ growth, impregnation, and sol–gel hybridization, are assayed in terms of their interfacial coupling, stability, and photocatalytic relevance for heavy-metal immobilization. A regional case context from Bengkulu Province is used solely to illustrate feedstock availability and chemical relevance, without extrapolating to production yield or economic feasibility. The results demonstrate that the functional performance of TiO₂–C-dots systems is governed primarily by synthesis parameters and composite architecture rather than by precursor volume. Current evidence situates this technology at an early development stage, where reproducible fabrication and interfacial engineering remain the principal determinants of applicability. These findings provide a process-centered framework for evaluating biomass-derived photocatalytic composites while avoiding premature feasibility claims unsupported by mature conversion technologies.
Preparation of Bio-Oil and Biochar through Co-Pyrolysis of Pennisetum purpureum and HDPE Plastic Waste at Various Feedstock Ratios and Temperatures Asfihani Asfihani; Azhari Azhari; Adi Setiawan
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.80547

Abstract

This study investigates the co-pyrolysis process of elephant grass (Pennisetum purpureum) and HDPE plastic waste and evaluates the properties of the resulting bio-oil and biochar. The process was conducted in a pilot-scale reactor under a nitrogen atmosphere using a two-stage heating scheme at 300°C and 450°C, with biomass–HDPE weight ratios of 100:0, 90:10, 75:25, 60:40, and 50:50. The method used in this work includes product yield analysis, thermophysical characterization, GC–MS-based chemical composition analysis, and ANOVA statistical validation to determine the optimum conditions for Pennisetum purpureum–HDPE co-pyrolysis process. The results indicate that the addition of HDPE does not increase the absolute yield of bio-oil but significantly enhances its energy quality. The calorific value of the bio-oil increased from 10,579 cal/g for pure biomass to a maximum of 12,029 cal/g at a 75:25 biomass–HDPE weight ratio, accompanied by a compositional shift from oxygenated compounds toward the dominance of fatty acid methyl esters (FAME) and medium- to long-chain hydrocarbons. At the same ratio, biochar achieved the highest yield (44.93% w/w) while maintaining characteristics suitable for energy applications. These findings identify the 75:25 biomass–HDPE ratio as the optimum condition based on both experimental and statistical evidence, and demonstrate that biomass–HDPE co-pyrolysis is an effective strategy for waste utilization and for enhancing the quality of renewable energy products.
Treatment of Palm Oil Mill Effluent by an Integrated Aeration–Bipolar Electrocoagulation System Febrianto Adi Nugroho; Handoko Rusiana Iskandar; Nadiem Anwar; Tiara Ariani Putri; Putu Teta Prihartini Aryanti
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.78989

Abstract

Electrocoagulation (EC) has increasingly been used in wastewater treatment, including palm oil mill effluent (POME), due to its ease of operation and less sludge production. In this study, POME was treated using an integrated aeration and EC process, which was conducted continuously at a constant flow rate of 500 mL.min-1. The agitation process was applied in the EC reactor at a rotating speed of 20 rpm to shorten the electrolysis reaction time. The EC reactor was equipped with 6 electrodes as baffles. Two current densities (12 and 15A.m-2) and electrode configurations (3A-3C and 2A-2C-2B) were used, and the resulting effluents were compared. The experimental results showed that the highest contaminant removal was achieved with the electrode configuration 2A-2C-2B and the current intensity was 15 A. The BOD removal efficiency was 91.36% (from 132 to 11.4 mg.L-1), COD of 81.27% (from 386 to 72.3 mg.L-1), TDS of 47.64% (from 645.5 to 338 mg.L-1), TSS of 76.27% (from 43.7 to 10.4 mg.L-1), and turbidity of 96.46% (from 59.65 to 2.11 NTU). Meanwhile, the total energy requirement was 21.33 kWh.m-3 with the pH of the effluent of 8.05. The combination of aeration-EC can be used as an alternative POME treatment to achieve high contaminant removal efficiency.
Comparative Simulation and Modeling of Hydrogen Explosion Consequences Based on TNT Equivalent Virda Nur Lu'lu; Hary Devianto; Pramujo Widiatmoko
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.82563

Abstract

Hydrogen is increasingly adopted as a low-carbon energy carrier, creating a need for rapid and auditable blast-consequence screening to inform hazard zoning. This study develops a web-based simulation platform that automates a transparent TNT-equivalent workflow from minimal inputs (inventory volume and evaluation distance). The platform converts volume to mass, estimates TNT-equivalent charge using an energy basis and efficiency factor, applies Hopkinson–Cranz cube-root scaling, and predicts peak side-on overpressure using three well-established empirical correlations (Crowl and Louvar, Alonso, and Sadovski) under harmonized assumptions, while exporting calculation logs for traceability. Validation uses a Type-IV high-pressure hydrogen vessel-burst dataset with measurements at 2–18 m. Over the sensor-intact 6–18 m window, the Alonso correlation achieves MAE 6.006 kPa with R² 0.999, whereas Crowl and Louvar and Sadovski correlations yield MAEs of 18.136 kPa and 17.164 kPa with R² of 0.985 and 0.993. A 50 kg TNT-equivalent Gangneung 2019 case gives 50.9–86.7 kPa at 15 m and 3.58–6.34 kPa at 100 m, consistent with reported steel deformation and widespread glazing damage. Overall, the platform enables transparent, traceable preliminary consequence estimation to support hazard-zoning decisions for hydrogen storage.

Page 54 of 54 | Total Record : 540

 50   51   52   53   54 

Filter by Year

1999 2026


Reset
Filter By Issues
All Issue Volume 26 No.1 April 2026 Volume 25 No.3 December 2025 Volume 25 No.2 August 2025 Volume 25 No.1 April 2025 Volume 24 No.3 December 2024 Volume 24 No.2 August 2024 Volume 24 No.1 April 2024 Volume 23 No.3 December 2023 Volume 23 No.2 August 2023 Volume 23 No.1 April 2023 Volume 22 No. 3 December 2022 Volume 22 No.2 August 2022 Volume 22 No. 1 April 2022 Volume 21 No.4 December 2021 Volume 21 No. 3 September 2021 Volume 21 No. 2 June 2021 Volume 21 No. 1 March 2021 Volume 20 No.4 December 2020 Volume 20 No.3 September 2020 Volume 20 No.2 June 2020 Volume 20 No.1 March 2020 Volume 19 No. 4 December 2019 Volume 19 No. 3 September 2019 Volume 19 No. 2 June 2019 Volume 19 No. 1 March 2019 Volume 18 No. 4 December 2018 Volume 18 No. 3 September 2018 Volume 18 No. 2 June 2018 Volume 18 No. 1 March 2018 Volume 17 No. 4 Desember 2017 Volume 17 No. 3 September 2017 Volume 17 No. 2 Juni 2017 Volume 17 No.1 Maret 2017 Volume 16 No.4 Desember 2016 Volume 16 No.3 September 2016 Volume 16 No. 2 Juni 2016 Volume 16 No.1 Maret 2016 Volume 15 No.4 Oktober 2015 Volume 15 No.3 April 2015 Volume 15, No.2, OKTOBER 2014 Volume 15, No.1, APRIL 2014 Volume 14, No. 4, OKTOBER 2013 Volume 14, No. 3, APRIL 2013 Volume 14, Nomor 2, Oktober 2012 Volume 14, Nomor 1, April 2012 Volume 13, Nomor 4, Desember 2011 Volume 13, Nomor 3, Juni 2011 Volume 13, Nomor 2, Desember 2010 Volume 13, Nomor 1, Juni 2010 Volume 12, Nomor 4, Desember 2009 Volume 12, Nomor 3, Juni 2009 Volume 12, Nomor 2, Desember 2008 Volume 12, Nomor 1, Juni 2008 Volume 11, Nomor 2, Desember 2007 Volume 11, Nomor 1, Juni 2007 Volume 10, Nomor 2, Desember 2006 Volume 10 No. 1 Juni 2006 Volume 09 No. 02 Desember 2005 Volume 09 No.1 Juni 2005 Volume 08 No.2 Desember 2004 Volume 08 No.1 Juni 2004 Volume 07 No.2 Desember 2003 Volume 07 No. 1 Juni 2003 Volume 6 No. 2 Desember 2002 Volume 6 No. 1 Juni 2002 Volume 5 No.2 Desember 2001 Volume 5 No. 1 Juni 2001 Volume 3 No.1 Desember 1999 More Issue