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All Journal Science and Technology Indonesia Indonesian Journal of Material Research
Arieveali, Heroldinho
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Construction of Ternary Heterojunction g-C3N4 /BiVO4 /GQDs Nanocomposite and Its Methylene Blue Photodegradation Performance Arieveali, Heroldinho; Setyaningtyas, Tien; Riyani, Kapti; Riapanitra, Anung
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
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.2025.10.3.777-788

Abstract

Ternary heterojunction g-C3N4/BiVO4/GQDs (CBG) composite photocatalysts were successfully made by high-temperature solidstate method. The prepared CBG photocatalyst was used to degrade the methylene blue (MB) solution under the simulation of visible light irradiation. The analysis of photocatalytic activity was carried out in the parameters of mass variation of composite components, pH of MB solution, and kinetic rate measurement. The results showed that the adsorption-photocatalysis synergy effect occurred at its best in CBG-20 samples with pH 9 in MB solution with a degradation kinetic rate following the pseudo-first order within 150 min of removal time as the optimum condition that could degrade MB by 94.81%. The result showed that the photocatalytic activity of theternary composite was higher than that of pristine g-C3N4, BiVO4, or the binary composite of g-C3N4/BiVO4. Trapping experiments results support the direct dual Z-scheme which shows that ·O2- is the most significant radical for the photocatalytic degradation of MB. The prepared ternary composites show outstanding application prospects in wastewater treatment.
Hierarchically Structured Zn-Al LDH/Hydrochar from Rambutan Peel (Nephelium lappaceum L.) for Enhanced Fe(II) Adsorption Erviana, Desti; Normah, Normah; Arieveali, Heroldinho; Ramadhan, Navinda
Science and Technology Indonesia Vol. 11 No. 2 (2026): 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.2026.11.2.524-537

Abstract

Dissolved ferrous ions in water pose significant environmental and operational challenges, necessitating efficient and sustainable removal technologies. In this study, a hybrid adsorbent was developed by integrating Zn-Al layered double hydroxide (LDH) with hydrochar derived fromrambutan peel (Nephelium lappaceum L.) via coprecipitation. Characterization confirmed successful composite formation with a substantial increase in specific surface area from 9.621 m2.g-1 for pristine Zn-Al LDH to 52.964 m2.g-1 for the composite, accompanied by enlarged pore volume and enriched oxygen-containing functional groups. Batch adsorption experiments showed strong pH dependence, with optimal Fe(II) removal at pH 6 and equilibrium reached within 120 min. The Zn-Al LDH@NL-HC composite exhibited a markedly higher adsorption capacity (51.501 mg.g-1) compared with Zn-Al LDH (15.692 mg.g-1) and hydrochar alone (8.594 mg.g-1), indicating a significant synergistic effect. Isotherm analysis revealed a maximum adsorption capacity of 76.336 mg.g-1 at elevated temperature, while kinetic data followed a pseudo-second-order model, suggesting chemisorption-dominated uptake. Thermodynamic parameters indicated an endothermic and spontaneous process. Regeneration studies demonstrated excellent stability, with adsorption efficiency maintained at 79.48% after five cycles. The superior performance is attributed to combined mechanisms including electrostatic attraction, surface complexation with oxygen-rich groups, ion exchange within LDH interlayers, and diffusion into mesoporous structures. These findings demonstrate the effective valorization of agricultural waste into a high-performance and reusable adsorbent for Fe(II) remediation in aqueous systems.
Adsorption of Methyl Orange from Aqueous Solution using Ni/Al LDH Modified with Camellia sinensis Leaf Extracts Amri, Amri; Arieveali, Heroldinho
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.
Co-Authors Amri Amri Anung Riapanitra Erviana, Desti Kapti Riyani Normah Normah, Normah Ramadhan, Navinda Tien Setyaningtyas