Abstract
A highly efficient, carbon-free rice husk ash (RHA) has been successfully used as a catalyst in oxalic acid (OA) decomposition by combining with ozonation at pH 3. The catalyst was characterized using various analytical techniques. X-ray fluorescence (XRF) analysis showed that RHA catalyst contains SiO2 as a major constituent and MgO, P2O5, SO3, K2O, CaO, MnO2, Fe2O3, CuO, ZnO as minor constituents. X-ray diffraction (XRD) and EDX analysis consistently confirmed the presence of silica as a major constituent. Cold field scanning electron microscopic (FESEM) analysis revealed nonuniform particle size and the presence of external pores on the catalyst surface. Elemental analysis (EA) indicated that RHA contains negligible percentage of carbon content. Oxalic acid degradation as well as its TOC removal was studied at various physicochemical conditions. Adsorption and ozonation processes are not effective for oxalic acid and its TOC removal. The addition of RHA catalyst in the ozonation process caused 76.2% OA...
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