| Summary: | 碩士 === 明新科技大學 === 化學工程與材料科技研究所 === 100 === Titanium dioxide is one of the most commonly used photocatalyst in the industry but is flawed in having low specific surface area and inconsistent thermal stability. A better photocatalysis effect can be achieved if titanium dioxide is turned into powder form and thrown into waste water. Unfortunately, it will not be easily retrievable and can consequently cause secondary contamination. To broaden its scope of application, titanium dioxide can be made into thin films; however, the production process is more elaborate and complex.
This thesis consists of a literature review of relevant publications from year 2000 to 2010. It also reports the effect of thin films produced by Sol-Gel method in processing imitative dye in waste water by the irradiation of ultraviolet light. The effect of photocatalyst in treating dye wastewater was measured by TOC and ADMI.. These results serve as a reference for academia and industry. The Intermediate products of oxidation was also investgated by IC (Ion- Chromatography).
The result of the experiment shows that under low concentration of dye (COD=100ppm), the elimination of total organic carbon (TOC) is close to 100% while true color (ADMI) elimination rate is close to 79.7% and stabilized after 48 hours. For the ion chromatographic analysis (IC), it was discovered that the mid-products formed during oxidation of dye waste water, formic acid and acetic acetic acids were close to zero after 18 hours (0.75 day). Then , forther oxidation was countinued. These results showed that thin films produced by Sol-Gel have good effect at low concentration under rather long processing times.
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