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All Journal VALENSI Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of the Indonesian Tropical Animal Agriculture Chimica et Natura Acta Environmental and Materials
RAHMAT WIBOWO
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Back-matter (June 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 2 (2025): June
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.2.%p

Abstract

Back-matter (June 2025)
Front-matter (September 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 3 (2025): September
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.3.%p

Abstract

Front-matter (September 2025)
Back-matter (September 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 3 (2025): September
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.3.%p

Abstract

Back-matter (September 2025)
Preparation and Characterization of Pt/TiO2 Nanotube Arrays (TNAs) Cathode by Photoreduction Method for Hydrogen Evolution Ningsih, Sherly Kasuma Warda; Wibowo, Rahmat; Gunlazuardi, Jarnuzi
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 11, No. 2, November 2025
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v11i2.46475

Abstract

TiO2 nanotube arrays were fabricated using a two-step anodization method. TNAs have been modified by the photoreduction technique with Pt as the cathode in the photoelectrocatalytic zone for the reduction reaction of H+ to produce hydrogen. TNAs with Pt were modified using H2PtCl6 as the precursor by immersion of this solution on the TNA substrate. Pt/TNAs were characterized using SEM-EDX, UV-Vis DRS, XRD, Raman Spectroscopy, Photoluminescence (PL), and photoelectrochemical analysis. The results show that the morphology of TNAs in the tube forms 2.1mm in height, and Pt nanoparticles are formed on the mouth wall of the tube with a size of approximately 10nm. EDX analysis shows that the composition of Pt/TNAs is approximately 0.15%, Ti 37.09%, and O 62.76%, indicating that Pt has been decorated on the TNAs photoanode. The band gap of Pt/TNAs was 2.82 eV. The diffractogram shows three groups of diffraction peaks, indicating the presence of anatase TiO2, Ti as a substrate, and Pt, which has been modified in the TNAs. The Raman peaks of TNAs are confirmed to appear at Raman shifts of 144.75, 196.51, 395.94, 517.14, and 638.85 cm-1. PEC cathodes for hydrogen production using Pt-decorated TNAs have been successfully prepared using photoreduction.
Front-matter (Desember 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 4 (2025): December
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.4.%p

Abstract

Front-matter (Desember 2025)
Back-matter (Desember2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 4 (2025): December
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.4.%p

Abstract

Back-matter (Desember 2025)
Optimizing vanillin and phenol production from benzyl phenyl ether using CoMoO4/H-ZSM-5: A Box-Behnken design approach Khatrin, Irena; Amanullah, Duha Rushida; Wibowo, Rahmat; Howe, Russell Francis; Krisnandi, Yuni Krisyuningsih
Environmental and Materials Vol. 3 No. 2: (December) 2025
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v3i2.2025.2161

Abstract

Background: Lignin valorization into high-value chemicals is crucial for sustainable development. This study focused on optimizing the catalytic conversion of benzyl phenyl ether (BPE), a lignin model compound, to vanillin and phenolic compounds. Methods: Hierarchical H-ZSM-5 was synthesized via a dual-template method and subsequently modified by wet impregnation with bimetallic cobalt and molybdenum oxides (CoMoO4/H-ZSM-5). Catalyst properties were thoroughly characterized using various techniques, including XRD, FTIR, XRF, N2-physisorption, and SEM-EDS mapping. Reaction conditions, specifically Co:Mo ratio, temperature, and reaction time, were optimized using the Box-Behnken design (BBD), and product yields were quantified by High-Performance Liquid Chromatography (HPLC). Findings: Characterization confirmed successful catalyst synthesis, organic template removal, and bimetal oxide incorporation without significant structural damage. Catalytic tests demonstrated 100% BPE conversion. The highest experimental vanillin yield achieved was 54.69%. BBD analysis revealed that the interaction between Co:Mo ratio and temperature, as well as the quadratic effect of Co:Mo ratio, were the most influential factors impacting product yields. The optimal parameters for maximizing vanillin and phenolic yield were determined to be a Co:Mo ratio of 3:7, a temperature of 169 °C, and a reaction time of 31 minutes. While the phenolic model showed a reasonable fit (R² = 0.76), the vanillin model exhibited a lower fit (R² = 0.34) with significant lack-of-fit. Conclusion: This research provides crucial insights into the efficient production of high-value chemicals from BPE, offering a comprehensive optimization approach for the CoMoO4/H-ZSM-5 catalytic system. Novelty/Originality of this article: This study represents a novel contribution to lignin valorization.
One-pot catalytic conversion of glucose to 2,5-furandicarboxylic acid over NiO-modified ZSM-5 zeolites: Effects of reaction temperature and solvent ratio Pratama, Arnia Putri; Mulyadi, Andita Junia; Wibowo, Rahmat; Krisnandi, Yuni Krisyuningsih
Environmental and Materials Vol. 3 No. 2: (December) 2025
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v3i2.2025.2642

Abstract

Background: 2,5-Furandicarboxylic acid (FDCA) has gained increasing attention as a key bio-based intermediate for the production of polyethylene furanoate (PEF) and other sustainable polyesters, offering a viable alternative to fossil-derived monomers. Although FDCA is conventionally produced via oxidation of 5-hydroxymethylfurfural (HMF), direct one-pot conversion of glucose remains challenging due to the requirement for integrated catalytic functions and the strong influence of reaction conditions. Hierarchical zeolites modified with transition-metal oxides are promising for one-pot glucose-to-FDCA conversion; however, the effects of reaction temperature and solvent composition have not been systematically evaluated and are examined here using hierarchical ZSM-5, NiO-modified ZSM-5, and NiO catalysts. Methods: Hierarchical ZSM-5 was synthesized via a dual-template method and modified with NiO through an impregnation–spray technique to introduce redox-active sites. The catalysts were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, nitrogen physisorption, and Scanning Electron Microscope-Energy Dispersive X-Ray to establish correlations between structural, compositional, and textural properties and catalytic performance. Catalytic reactions were conducted at varying temperatures using a γ-valerolactone–water solvent system with different volume ratios. Findings: NiO-modified hierarchical ZSM-5 exhibited superior catalytic performance compared to the parent zeolite and NiO, achieving a maximum FDCA yield of 2.36% at 150 °C with an optimal γ-valerolactone–water ratio of 1:1. Higher FDCA yield over NiO-modified hierarchical ZSM-5 reflects the combined effects of hierarchical porosity, NiO species, reaction temperature, and solvent ratio. Conclusion: This study demonstrates that NiO-modified hierarchical ZSM-5 can promote one-pot glucose-to-FDCA conversion, with reaction temperature and solvent ratio identified as key parameters for performance optimization. Novelty/Originality of this article: This study provides a systematic assessment of the effects of reaction temperature and γ-valerolactone–water solvent ratio on FDCA formation over NiO-modified hierarchical ZSM-5 in a one-pot glucose conversion system, establishing catalyst and process design principles.
Back-matter (Maret 2026) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 51, No 1 (2026): March
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.51.1.%p

Abstract

Back-matter (Maret 2026)
Front-matter (Maret 2026) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 51, No 1 (2026): March
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.51.1.%p

Abstract

Front-matter (Maret 2026)
Co-Authors Afiten Rahmin Sanjaya Aliyah Amanullah, Duha Rushida Einaga, Yasuaki Endang Saepudin, Endang Feri Candra Ivandini Tribidasari Anggraningrum Jarnuzi Gunlazuardi Khatrin, Irena Mulyadi, Andita Junia Nurhidayat , Reza Rizqi Pratama, Arnia Putri Russell Francis Howe, Russell Francis Sherly Kasuma Warda Ningsih Syauqi, Muhammad Iqbal Utami, Chichi Amne Yuni Krisyuningsih Krisnandi, Yuni Krisyuningsih