| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 105 === TiO2 has served as one of the most promising photocatalysts for various applications due to its wide band structure, long-term stability, very low aqueous solubility, nontoxicity and low cost features. Among different mineral forms of TiO2, anatase is the most active semiconductor for practical wastewater treatment. Photocatalytic degradation process using TiO2 offers advantages including no formation of sludge, complete conversion of contaminants to relatively harmless end products, reuse availability, and simultaneous removal of both organic and inorganic pollutants.
The increasing usage of dyes in numerous industries has led to a rise in the disposal of large amounts of dye wastewater. Improperly disposal of dye pollutants from textile industries poses serious environmental problems and public health concerns. It is estimated that around 15% of the dye is lost during dyeing and finishing processes and subsequently released as wastewaters. Along with massive development in the oxidative degradation, various advanced oxidation processes including photocatalysis, ozonolysis, sonocatalysis, photo-Fenton, photo electro-Fenton processes etc. have emerged as popular techniques to destroy recalcitrant compounds from wastewater.
To date, strategies tailing TiO2 photocatalytic performance for various intended applications have been intensively studied, namely, dopants addition, synthetic technique modification, and heterogeneous composite construction. In the present study, the photodcatalytic activity of TiO2/Fe-ZSM5 composites will be systematic accessed and the optimum operating parameters (e.g., dye concentration, pH, catalyst loading, and dopant ratio, etc.) will be identified.
The optimum degradation condition was obtained at pH 9, the concentration of RhB at 5 ppm, the light intensity at 538 w/m2, and catalyst loading (TiO2/Fe-ZSM5) at 0.5 g/L.
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