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All Journal Indonesian Journal of Material Research
Amri Amri
Research Center of Inorganic Materials and Coordination Complexes, Universitas Sriwijaya, Palembang, 30139, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering

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Adsorption of Methyl Orange from Aqueous Solution using Ni/Al LDH Modified with Camellia sinensis Leaf Extracts Amri Amri; Heroldinho Arieveali
Indonesian Journal of Material Research Vol. 4 No. 3 (2026): Future Issue: 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.20264393

Abstract

Water pollution caused by dye pollutants such as methyl orange (MO) can have a negative impact on humans, living organisms, and ecosystems. Adsorption is one of the promising methods in overcoming the presence of MO pollutants. This research focuses on the synthesis of layered double hydroxide (LDH) Ni/Al composites prepared by coprecipitation method with the addition of green tea/Camellia sinensis (CS) leaf extract as supporting material. The synthesized materials obtained were then characterized using X-ray diffraction (XRD) patterns and Fourier transform infrared spectra (FTIR). The Ni/Al and Ni/Al-CS materials were then evaluated as adsorbents to adsorb MO from aquatic solutions. The maximum capacity of MO adsorption obtained was 18.519 mg.g−1 on Ni/Al LDH and 49.261 mg.g−1 on Ni/Al-CS, respectively. The Langmuir isotherm model showed the best fit to the adsorption data on both materials, while the kinetics of the adsorption process followed a pseudo second-order (PSO) model. Thermodynamic analysis (ΔG°, ΔS°, and ΔH°) showed that the MO adsorption process on both materials was spontaneous and endothermic. The regeneration process carried out four consecutive regeneration cycles showed that Ni/Al-CS material has excellent adsorbent recycling ability, which only decreased by 10.26%. In contrast to Ni/Al LDH which experienced a significant decrease of up to 31.70% in the 4th cycle. These findings suggest that Ni/Al CS material is a promising adsorbent for MO removal applications from aquatic solutions.
Selective Adsorption Performance of Graphene Oxide Toward Norfloxacin and Moxifloxacin in Aqueous Solution Amri Amri; Alfan Wijaya
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.
Co-Authors Alfan Wijaya Heroldinho Arieveali