| Summary: | 碩士 === 國立中央大學 === 環境工程研究所 === 98 === Photocatalysts are kind of catalyst that can be irradiated by light and generate free radicals, and this kind of radicals will attack target pollutants using redox method for degradation of pollutants. This study investigated the preparation of zinc oxide catalyst in different conditions using different polysaccharide and its efficiency of photocatalytic degradation of three kinds of pollutants such as methylene blue, crystal violet, and congo red.
Zinc oxide was prepared using different natural polysaccharides such as alginate, chitosan, and corn starch. Comparison of the photocatalytic efficiency of zinc oxide prepared using natural polysaccharides indicated that: (a) preparation was independent of ratio
of composition; (b) 450 ℃ was the best calcination temperature of zinc oxide; (c) different additives will generate different effects among different polysaccharides used to prepared zinc oxide ; (d) the best photocatalytic efficiency was obtained for sodium alginate and corn starch with conditions for the photocatalytic circulating water temperature was 30 ℃,when the concentration of pollutants is low, the better photocatalytic effect was obtained. The experimental results showed that photocatalytic activity decrease on exposure time, catalyst’s dosage and
pH.
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