Abstract
Geopolymer is anorganic polymer which can be used to heavy metal removal through adsorption process. Geopolymer can be produced from raw material containing alumino-silicate oxide such as fly ash which is solid waste from coal combustion. In this study, geopolymer was prepared from fly ash with alkali activation process using mixture of 10 N NaOH solution and Na-Silicate solution. Fly ash-based geopolymer was then applied as adsorbent for different heavy metals removal, i.e. Cu2+, Fe2+, Mn2+, Zn2+, in aqueous solutions. Removal efficiencies were calculated from changes of heavy metal concentration determined by Atomic Absorption Spectroscopy (AAS) analysis. Characterization of fly ash- based geopolymer covered Brunauer-Emmett-Teller (BET) surface area analysis and Scanning Electron Microscope- Energy Dispersive X-Ray (SEM-EDX) analysis. The results showed that fly ash-based geopolymer could adsorb heavy metals with better removal efficiency compared to the raw fly ash.
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