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All Journal Science and Technology Indonesia Communications in Science and Technology Bulletin of Chemical Reaction Engineering & Catalysis
Oh, Won-Chun
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Materials Science & Nanotechnology Physics

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Dual metal NiMo dispersed on silica derived from rice husk ash as a catalyst for hydrocracking of used palm cooking oil into liquid biofuels Wijaya, Karna; Setyono, Risandrika Dwijayanti Putri; Pratika, Remi Ayu; Heraldy, Eddy; Suseno, Ahmad; Hakim, Lukman; Tahir, Iqmal; Oh, Won-Chun; Saviola, Aldino Javier
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1480

Abstract

The production of vegetable-based fuels has intensified in recent years due to the decreasing availability of fossil fuels and their environmental impacts. This study explores the synthesis, characterization, and application of nickel-molybdenum (NiMo) bimetal-dispersed silica catalysts for converting used palm cooking oil into liquid biofuels. The catalysts were synthesized using the wet impregnation method, incorporating Ni and Mo metals at concentrations of 1, 2, and 3% by weight of silica derived from rice husk ash. Impregnation of the silica with Ni and Mo metals increased its acidity, with the NiMo/SiO? 2 catalyst exhibiting the highest acidity value of 4.34 mmol/g. This catalyst also demonstrated the largest specific surface area and total pore volume, measured at 205.51 m²/g and 0.88 cm³/g, respectively. Hydrocracking of used palm cooking oil into liquid biofuels was performed at an optimum temperature of 450 °C with catalyst-to-feed weight ratios of 1:100, 2:100, and 3:100 for 1 h by hydrogen gas supply of 20 mL/min. Catalyst activity tests revealed the highest mass percentage of liquid product, 23.3%, at a ratio of 1:100 (w/w), with a biofuel yield of 20.34%, comprising 14.20% gasoline and 6.14% diesel. By utilizing biomass waste as both a catalyst and feedstock, this study presents a sustainable approach to reducing the carbon footprint and promoting environmental balance.
Clitoria ternatea Flower Extract Mediated Synthesis of Ni-Doped Hydroxyapatite as Photocatalyst, Antibacterial, and Drug Delivery Agent for Anticancer Drug Fatimah, Is; Nurlaela, Nunung; Fauziyyah, Anas Zahra; Sagadevan, Suresh; Hidayat, Habibi; Haneef, Mehru Nisha Muhamad; Daud, Muhammad Fauzi; Kamari, Azlan; Oh, Won-Chun
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.2.360-373

Abstract

In the present study, green synthesis of nickel-doped hydroxyapatite using Clitoria ternatea flower extract, and activity testing as photocatalyst, antibacterial agent and drug delivery agent were performed. Synthesis was conducted by hydrothermal treatment of co-precipitated precursors previously mediated with the extract. As drug delivery agent, immobilization of 5-fluorouracil (5FU) onto the prepared sample was performed by spray-drying method. Physicochemical characterization techniques of X-ray diffraction, UV-Visible Diffuse Reflectance Spectrophotometry, transmission electron microscopy, Raman and Fourier-Transform Infra-red spectroscopy were performed to determine the structural and surface properties of material. Photocatalytic activity evaluation for tetracycline removal showed that material has capability to reduce concentration by photocatalytic degradation and photocatalytic oxidation. The degradation efficiency of material was 83.78%. The prepared material exhibited a significant activity against Staphylococcus aureus and Escherichia coli bacteria. The material also expressed the potency as a drug-delivery agent of 5-fluorouracil as shown by the reduced CT26 cell viability of more than 85% during 48 hours.
Effect of Nickel Incorporation on Nitrogen-Doped Titania/Zirconia Nanocomposites for Enhanced Visible-Light Photocatalytic Degradation of Phenol Syoufian, Akhmad; Saviola, Aldino Javier; Janah, Reza Rodhatul; Afifah, Rina; Wijaya, Karna; Kurniawan, Rian; Sudiono, Sri; Oh, Won-Chun; Wangsa, Wangsa
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20529

Abstract

The rapid expansion of industrial activities has resulted in the discharge of persistent organic pollutants, such as phenol, into aquatic environments. Nowadays, developing visible-light-responsive photocatalysts for the efficient degradation of such pollutants remains a major environmental challenge. In this study, nickel–nitrogen co-doped titania immobilized on zirconia (Ni,N–TiO₂/ZrO₂) nanocomposites with varying nickel loadings were synthesized and evaluated for phenol photodegradation under visible-light irradiation. Nickel incorporation significantly modified the optical and photocatalytic properties of the materials. The 5% Ni,N–TiO₂/ZrO₂ catalyst exhibited the lowest band gap energy (2.69 eV) compared with N–TiO₂/ZrO₂ (3.03 eV), leading to improved visible-light absorption and enhanced charge transfer. Under the experimental conditions (initial phenol concentration = 10 mg.L⁻¹, catalyst dosage = 100 mg, irradiation time = 120 min), it achieved a phenol removal efficiency of 85.36% with an apparent rate constant of 0.0229 min⁻¹, outperforming N–TiO₂/ZrO₂ (40.72%, 0.0042 min⁻¹). These results confirm that a 5 wt% nickel loading provides the most effective modification, demonstrating a strong synergistic interaction between nickel and nitrogen that enhances photocatalytic activity. The developed Ni,N–TiO₂/ZrO₂ catalyst, therefore, holds significant promise for future applications in water purification and environmental remediation. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Role of Synthesis Route on The Structural and Photocatalytic Activity of Magnetic TUD-1 Coated NiFe2O4 Fatimah, Is; Wijayanti, Hiroko Kawaii; Sagadevan, Suresh; Sheikh Mohd Ghazali, Sheikh Ahmad Izaddin; Oh, Won-Chun; Doong, Ruey-an
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20665

Abstract

In this research, TUD-1 coated NiFe2O4 was synthesized by comparing in-situ and post- synthesis methods, for application as photocatalyst material in dye degradation. One pot synthesis of material was conducted by mixing all chemical precursors in a homogeneous system under hydrothermal condition, followed by calcination at 500oC for 2h. For comparison purpose, two-steps synthesis procedure conducted by firstly synthesis of TUD-1 followed by its use for NiFe2O4 impregnation. Tetraethyl orthosilicate (TEOS) was employed as precursor for TUD-1 and NiCl2.6H2O and FeCl3.6H2O were utilized as precursors for synthesis of NiFe2O4 by co-precipitation method. The physicochemical properties of materials were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), Gas Sorption Analyzer (GSA), zeta potential, Vibrating-Sample Magnetometry (VSM) and Ultraviolet-Diffuse Reflectance (UV-DRS). The photocatalytic activity examination of materials was conducted for methylene blue (MB) and rhodamine B (RhB) photocatalytic oxidation. The results indicated that in-situ prepared material (NFT-1) produced a higher specific surface area of 228.75 m2/g compared to post-synthesis material (NFT-2) with the value of 218.07 m2/g. The NFT-1 material exhibited band gap energy of 2.73 eV which support adsorption capacity and photocatalytic activity. An excellent degradation of MB of 95.67% removal and RhB of 95.08% removal during 60 min were demonstrated by NFT-1. The materials showed magnetism to support easy in separation and reusability. Based on the reusability results, the synthesized material has maintained stability until 5th cycles. Evaluation on the effect of scavengers on the kinetics of photocatalytic degradation has been performed and the hydroxyl radicals (●OH) was proven to be the most important species for the oxidation mechanism. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Afifah, Rina Ahmad Suseno Akhmad Syoufian Daud, Muhammad Fauzi Doong, Ruey-an Eddy Heraldy Fauziyyah, Anas Zahra Habibi Hidayat, Habibi Haneef, Mehru Nisha Muhamad Iqmal Tahir Is Fatimah Janah, Reza Rodhatul Kamari, Azlan Karna Wijaya Lukman Hakim Nurlaela, Nunung Remi Ayu Pratika Rian Kurniawan Sagadevan, Suresh Saviola, Aldino Javier Setyono, Risandrika Dwijayanti Putri Sheikh Mohd Ghazali, Sheikh Ahmad Izaddin Sri Sudiono Wangsa, Wangsa Wijayanti, Hiroko Kawaii