The Effect of Unburned Carbon on Coal Fly Ash toward its Adsorption Capacity for Methyl Violet

Coal fly ash (CFA) generated by coal-based thermal power plants is mainly composed of quartz, mullite, and unburned carbon. In this study, the effect of unburned carbon on CFA toward its adsorption capacity was investigated. CFA with various carbon content was obtained by refluxing it with sulfuric acid having various concentration at various temperature and reflux time, by heating at 400-800°C, and by sieving into 100-mesh in particle size. To evaluate the effect of unburned carbon on CFA toward its adsorption capacity, adsorption of methyl violet solution with treated CFA was carried out. The research shows that unburned carbon leads to adsorption capacity decrease. The highest adsorption capacity of treated CFA was found 5.73 x 10-4mol.g-1.

Authors:

• Widi Astuti
• Agus Prasetya
• Endang Tri Wahyuni
• I Made Bendiyasa

Keywords:

• CFA
• carbon
• methyl violet
• adsorption capacity.

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