This study demonstrates an effective adsorbent derived from coal fly ash, improving wastewater treatment by 94.48% iron (III) removal efficiency, suggesting eco-friendly remediation.
Indonesia, as a country reliant on coal-fired power plants, produces substantial coal fly ash (CFA) waste, posing serious environmental and health risks. However, this waste can be repurposed into valuable materials, such as nano-silica, which has potential applications in wastewater treatment. This study focuses on the extraction, characterization, and application of nano-silica derived from CFA for the removal of Fe (III) from wastewater. Silica was extracted through a precipitation method by adding sodium hydroxide to produce sodium silicate, followed by hydrochloric acid to enhance the silica yield. The extracted silica was then converted into nano-silica using a combination of heating and ball milling. The resulting nano-silica was characterized using Fourier-transform infrared (FTIR) spectroscopy and a Particle Size Analyzer (PSA). Its adsorption efficiency was evaluated using Atomic Absorption Spectrometry (AAS), which confirmed a Fe (III) removal efficiency of 94.48%. These findings demonstrate that CFA-derived nano-silica is an effective, sustainable, and cost-efficient adsorbent for heavy metal remediation in wastewater.
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Hasan et al. (2025) studied this question.
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