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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 5 Documents
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Search results for , issue "Volume 25 No.3 December 2025" : 5 Documents clear
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.%p

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.%p

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.%p

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.%p

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.%p

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. 

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