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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan JURNAL KIMIA SAINS DAN APLIKASI
Sukma, Vinda Avri
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Engineering

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Sustainable Recovery of SiO₂, Al₂O₃, and MgO from Slag, Aluminum Cans, and Bittern Sukma, Vinda Avri; Dahlan, Astryd Viandila; Sudibyo, Sudibyo; Wulandari, Yeni Ria; Ramandani, Adityas Agung
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 1 (2025): March 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i1.47-58

Abstract

This study investigates the utilization of solid waste from slag and aluminum cans as sources of valuable raw materials, along with bittern waste for magnesium oxide (MgO)cons production. Slag, a byproduct of industrial combustion in the palm oil industry, and aluminum cans, generated from human consumption in urban areas, were both subjected to leaching processes to recover silica (SiO₂) and alumina (Al₂O₃), respectively. The leaching of slag using 4 M NaOH yielded 85.68% SiO₂, while aluminum cans treated with 4 M HCl produced 85.90% Al₂O₃. Additionally, the study extracted MgO from bittern waste via precipitation, resulting in 76.98% MgO. X-ray fluorescence (XRF) analysis was employed used to determine the composition of the slag, aluminum can waste, and bittern, while X-ray diffraction (XRD) analysis confirmed the crystallinity of the recovered materials. The integration of recycled materials into the production of cordierite ceramics represents an innovative approach to waste valorization, offering potential for the development of advanced materials from industrial and urban waste. This research highlights the potential for valorizing industrial and municipal solid wastes through chemical processes, contributing to sustainable resource recovery and environmental conservation.
Enhanced Bio-Oil Production from Agricultural Waste via NiCl₂-Assisted Pyrolysis: A Comparative Study of Candlenut and Coffee Shells Wulandari, Yeni Ria; Firmansyah, Muhammad Arif; Variyana, Yeni; Haryono, Tri; Sukma, Vinda Avri; Sudibyo, Sudibyo; Purwanto, Nurjan Didik
Jurnal Kimia Sains dan Aplikasi Vol 29, No 2 (2026): Volume 29 Issue 2 Year 2026 (In Press)
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.2.119-131

Abstract

Indonesia’s limited fossil fuel reserves, coupled with increasing national energy demand, highlight the need for alternative and renewable fuel sources. Biomass-derived bio-oil produced through pyrolysis represents a promising solution that can both reduce dependence on petroleum-based fuels and mitigate environmental pollution from underutilized biomass waste. This study investigates the production of bio-oil from candlenut shells and coffee shells through pyrolysis at varying temperatures (250, 350, and 450°C), conducted with and without a NiCl2 catalyst. The bio-oil was characterized for yield, density, and viscosity. The highest bio-oil yields from non-catalytic pyrolysis were achieved at 450°C, amounting to 39.14% for candlenut shells and 41.80% for coffee shells. Catalytic pyrolysis using NiCl2 enhanced the bio-oil yield, producing up to 55.78% (candlenut shells at 450°C) and 58.05% (coffee shells at 350°C). Density measurements showed the highest values in catalytic pyrolysis at 250°C, while the lowest densities were observed in non-catalytic pyrolysis at 450°C. Viscosity followed a similar trend, decreasing with increasing temperature and the presence of the catalyst. FTIR analysis confirmed the presence of functional groups including C–O, C=O, C=C, C≡C, C–H, and O–H. Overall, this study demonstrates the potential of candlenut and coffee shell waste as feasible feedstocks for bio-oil production, offering alternative renewable energy sources for future applications.
Co-Authors Dahlan, Astryd Viandila DIDIK PURWANTO Firmansyah, Muhammad Arif Indradewa, Rhian Ramandani, Adityas Agung Ria Wulandari Sudibyo Sudibyo Tri Haryono Variyana, Yeni