Abstract
The photo catalytic decolourization of Methyl orange (MO) widely used as a textile dye, can be photocatalysed by TiO2 based photo catalysts using Advanced Oxidation Process (AOPs). Doped TiO2 photo catalysts were synthesized by liquid impregnation method and sol-gel method and characterized by UV-Visible spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). TiO2 appears to be a suitable catalyst for water treatment. In this study the experiments were carried out by irradiating the aqueous solution of dyes containing photo catalyst under solar light. The rate of decolourizaion was estimated from residual concentrations using photocolourimeter. Photodecolourization efficiency was zero when the photo catalysis was carried out in the absence of sunlight and it was small in presence of sunlight without catalyst. It was found that about 86% decolourization occurs with photo catalyst in the presence of sunlight within 6hr. After 8hr sunlight irradiation, complete decolourization was observed for metal doped photo catalysts. The effect of parameters such as amount of photo catalyst, irradiation time and dye concentration were also examined.
Published Version
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