| Summary: | 碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 102 === Dye wastewater treatment has been one of the most challenging tasks because it contains high colority and stubborn organic matter, which may be highly toxic to the surrounding environment. In this study, the reactive blue dyes (RB4) wastewater had been treated through the photocatalytic activity of fixed titanium dioxide (TiO2) film.
The TiO2 used in the experiment was prepared through sol-gel process. TiO2 solution was added with polyvinyl pyrrolidone (PVP) to modify PVP/TiO2 photocatalyst. Subsequently, the sol-gel was mixed with the wastewater containing RB4 and then treated with artificial UV light. TiO2-film photocatalysis was done within four parameters namely, wavelengths of UV light source, PVP dosage, coating times of TiO2-film and the reaction time.
It was found that the best film was prepared with the dosage of 18 g/L-PVP by sol-gel process during 2 hours sintering at 550 0C. The photocatalyst of 18g/L-PVP/TiO2 contained both anatase and rutile phase that could be spread on glass sheet. The particle size was smaller and the specific surface area was larger than that of the unmodified TiO2 photocatalyst (0 g/L-PVP/TiO2), they were 18.94nm and 170.9m2/g, respectively. Therefore, the modified TiO2 photocatalyst may enhance the reaction effect.
It was also found that the removal of RB4 for 5 coating times was higher than that for 3 coating times or 7 coating times when using the best preparation of 18g/L-PVP/TiO2 photocatalyst. Under 5 hours of UV254 illumination, the removals of ADMI, COD were 48.87% and 32.86%, respectively. Therefore, it indicated that modified TiO2-film photocatalyst could increase the removal of azo dyes wastewater effectively.
Keywords: photocatalysis process, TiO2 film photocatalyst, polyvinyl pyrrolidone, Sol-Gel, RB4.
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