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All Journal AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment)
Akbar Ismi Aziz Pramito
1Study Program D-IV Industrial Chemical Technology, Department of Chemical Engineering, Politeknik Negeri Sriwijaya, Palembang, South Sumatera, Indonesia.
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Energy Environmental Science

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Optimizing the Sonication Method to Extract Silica and Synthesize Silicon from Coal Fly Ash for Lithium-Ion Battery Anode Material Ridho Rizki Ananda; Rusdianasari Rusdianasari; Akbar Ismi Aziz Pramito
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 3 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i3.1356

Abstract

Fly ash is a solid waste generated from coal combustion in power plants. This study presents an optimized method for extracting high-purity silica from coal fly ash using Sequential Acid-Alkaline Leaching (SAAL) with HCl concentration variations (1–3 M), followed by magnesiothermic reduction and ultrasonic bath sonication (90–150 minutes) to produce nanosilicon. X-ray fluorescence (XRF) analysis showed that 1 M HCl produced the highest silica purity (97.86%). Scanning Electron Microscopy (SEM) characterization revealed that 150 minutes of sonication significantly reduced average silicon particle size to 6.26 nm through acoustic cavitation mechanisms. Electrical testing showed a resistance value of 3.93 M?. These findings demonstrate an effective approach for converting coal waste into high-value nanosilicon, supporting sustainable industrial practices and circular economy principles. Contribution to Sustainable Development Goals (SDGs):SDG 7: Affordable and Clean EnergySDG 9: Industry, Innovation and InfrastructureSDG 12: Responsible Consumption and Production
Co-Authors Ridho Rizki Ananda Rusdianasari Rusdianasari