| Summary: | 碩士 === 大同大學 === 化學工程學系(所) === 92 === Wastewater effluent from textile plants using various dyes is one of the major water pollutants to environment. Traditional chemical, physical methods and biological processes for treating the textile dye wastewaters have disadvantages such as high cost, high energy waste and generating secondary pollution during the treatment processes. The photocatalytic process using TiO2 semiconductor particles under UV light illumination has been shown to be potentially advantageous and applicable in the treatment of wastewater pollutants. In this study, the dye decomposition kinetics by nano-size TiO2 suspension at natural solution pH was experimentally studied by varying the agitation speed (50-200 rpm), TiO2 suspension concentration (0.037-0.26 g/L), initial dye concentration (10-50 ppm), temperature (10-500C), and UV power intensity (0-36 W). The experimental results show the agitation speed, varying from 50 to 200 rpm, has little influence on the dye decomposition rate and pH history; the dye decomposition rate increases with the TiO2 suspension concentration up to 0.15 g/L, then decrease with increasing TiO2 suspension concentration; the initial dye decomposition rate increases with the initial dye concentration up to a certain value depending upon the temperature, then decreases with increasing initial dye concentration; the dye decomposition rate increases with the UV power intensity up to 24 W, then increasing the UV power intensity cannot further increase the dye decomposition rate. A kinetic model has been developed to fit the experimental kinetic data well.
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