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All Journal Indonesian Journal of Chemistry Communications in Science and Technology Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Journal of Material Research
Wijaya, Alfan
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering

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Recycle Performance of Heterogeneous Catalyst Metal Oxides-Based Layered Double Hydroxide for Oxidative Desulfurization Process of 4-methyldibenzothiophene Ahmad, Nur; Rohmatullaili, Rohmatullaili; Hanifah, Yulizah; Wibiyan, Sahrul; Amri, Amri; Wijaya, Alfan; Mardiyanto, Mardiyanto; Mohadi, Risfidian; Royani, Idha; Lesbani, Aldes
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20034

Abstract

The desulfurization of oil must be resolved as soon as possible due to a variety of issues, including environmental contamination and protection regulations. It was believed that oxidative desulfurization (ODS) was the most promising method. In this research, metal oxide-based layered double hydroxides (TiO2@Ni-Al and ZnO@Ni-Al) were effectively synthesized for the ODS of 4-methyldibenzothiophene (4-MDBT). TiO2@Ni-Al and ZnO@Ni-Al exhibited superior catalytic performance and high recycling capacity, achieving a 99% removal rate after five reactions in 30 min. The heterogeneous catalyst TiO2@Ni-Al/ZnO@Ni-Al is easy to separate and recover from a reaction system. Increased temperature facilitates the transformation of 4-MDBT into 4-MDBTO2. The influence of H2O2's rapid decomposition rate, which can inhibit oxidation reactions, reduces the catalytic activity as the temperature increases. 4-MDBT Sulphur removal on TiO2@Ni-Al and ZnO@Ni-Al is 99.48 and 99.51%, respectively. TiO2@Ni-Al and ZnO@Ni-Al have great potential for use in the industry based on these results. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Selective Adsorption Performance of Graphene Oxide Toward Norfloxacin and Moxifloxacin in Aqueous Solution Amri, Amri; Wijaya, Alfan
Indonesian Journal of Material Research Vol. 3 No. 3 (2025): November
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253372

Abstract

Norfloxacin (NFX) and moxifloxacin (MFX) are widely used fluoroquinolone antibiotics that are frequently detected as residues in aquatic environments. Their persistent presence can increase the risk of antibiotic-resistant bacteria (ARB) emerging, making the selective removal of these compounds from water systems essential. This study evaluates the adsorption selectivity of NFX and MFX using graphene oxide (GO) as a potential adsorbent. The results show that GO exhibits a higher affinity for NFX than for MFX, indicating selective interactions between the functional groups of GO and NFX molecules. These findings confirm the potential of GO as a selective adsorbent for the removal of specific antibiotics from aqueous solutions and provide a basis for developing more effective wastewater treatment strategies.
Selective Adsorption of Mixed Dyes Using Freshwater Macroalgae (Cladophora sp.) Biomass: Spectroscopic Analysis Wijaya, Alfan; Ahmad, Nur
Indonesian Journal of Material Research Vol. 4 No. 2 (2026): July
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20264292

Abstract

This study investigates the selective adsorption behavior of freshwater macroalgae Cladophora sp. for the removal of mixed dye systems containing cationic (rhodamine B (RB), malachite green (MG), and methylene blue (MB)) and anionic dyes (congo red (CR) and remazol red (RR)). The biomass was characterized using Fourier-transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) analysis, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM–EDX), confirming the presence of abundant functional groups and a porous surface structure suitable for adsorption. The point of zero charge (pHpzc) was determined to be 6.5, indicating that the adsorbent surface becomes negatively charged under near-neutral conditions. Selective adsorption was evaluated using UV–Visible spectrophotometry combined with Gaussian peak deconvolution to distinguish individual dye contributions in mixed systems. The results showed a significantly higher adsorption efficiency for cationic dyes, with methylene blue exhibiting the highest removal efficiency (93.56%), followed by malachite green (91.48%) and rhodamine B (51.09%). In contrast, anionic dyes showed considerably lower adsorption, with congo red (33.99%) and remazol red (32.68%). The enhanced selectivity toward cationic dyes is primarily attributed to electrostatic attraction between the negatively charged adsorbent surface and positively charged dye molecules, supported by additional interactions such as π–π stacking and hydrogen bonding. These findings demonstrate that Cladophora sp. is a promising low-cost and sustainable bioadsorbent with selective adsorption capability, making it suitable for the treatment of complex dye-contaminated wastewater.
Co-Authors Adhiyanti, Nurmalina Aldes Lesbani Amri Amri Amri Ardiansyah, Redo Augustiara, Elsha Fajri, Shahibul Hanifah, Yulizah Hasja Paluta Utami, Hasja Paluta Idha Royani Juleanti, Novie Laila Hanum Mardiyanto Mardiyanto Melwita, Elda Normah Normah Normah Normah, Normah Nur Ahmad, Nur Risfidian Mohadi Rohmatullaili, Rohmatullaili Sayeri, Rabellia Juladika Siregar, Patimah Mega Syah Bahar Nur Sitanggang, Jonra P. Tarmizi Taher Wibiyan, Sahrul