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URN etd-0823105-131804 Statistics This thesis had been viewed 3010 times. Download 994 times. Author Cheng-wei Chien Author's Email Address email@example.com Department Chemical Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 88 Title IMMOBILIZATION OF TITANIUM DIOXIDE THIN FILM FROM SUSPENSION AND ITS PERFORMANCE OF DYE DEGRADATION Keyword titanium dioxide photocatalyst photocatalyst titanium dioxide Abstract In this study, nano-size TiO2 suspension was used to prepare TiO2 thin film onto the inner glass surface as photocatalyt to decompose dye in aqueous solutions. The full factorial design approach was adopted using three factors rotating time (10min and 50min), rotating speed (10rpm and 50rpm), and drying temperature (150oC and 250oC). The azo dye decomposition conversion under 8W UV illumination for 4 hours was measured as the response of the experimental design.
Several photoreactors were prepared under the same operating conditions and a series of dye degradation kinetic study was conducted. The conditions of the kinetic experiments are 0 to 600 rpm agitation speeds, 5 to 25mg/L initial dye concentrations, 15 to 55oC reaction temperature, and 2 to 10 initial pH. The experimental results showed that the dye decomposition rate increased with increasing agitation speed, increased with increasing initial dye concentration to a peak value than decreased, increased with increasing temperature, and decreased with increasing pH. A kinetic model based on the Langmuir-Hinshelwood model and the Lambert-Beer’s law has been developed and used to fit the kinetic data satisfactorily.
Advisor Committee Jia-ming Chern - advisor
none - co-chair
Tai-shang Chen - co-chair
Files Date of Defense 2005-06-23 Date of Submission 2005-08-23