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URN etd-0827108-150620 Statistics This thesis had been viewed 2605 times. Download 1119 times. Author Yi-Ming Chen Author's Email Address No Public. Department Chemical Engineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 130 Title STUDY ON PREPARATION OF TITANIUM DIOXIDE THIN FILMS ON GLASS PLATES BY SOL-GEL METHOD FOR DECOMPOSITION OF DYE WASTEWATER Keyword titanium dioxide dye wastewater UV illumination UV illumination dye wastewater titanium dioxide Abstract The nano-scale titanium dioxide has been recognized as a promising technology to treat wastewaters containing refractory organic compounds. There are many researches in related topics nowadays. One of the objectives in this study is how to immobilize the titanium dioxide for heterogeneous applications. We prepared TiO2 thin films coated on glass plates used as photocatalytic to decompose dye in aqueous solutions. The preparation included the sol-gel method, followed by coating, drying, and calcination. Some factors will affect the performance of the thin films such as i-PrOH/TTIP volume ratio, drying time, calcination time, calcination temperature and coating times were investigated. The conversion of azo dye decomposition in wastewater under 8W UV illumination for 1 hours was measured to identify the efficiency.
Several titanium dioxide photocatalyst coated on glass plate were prepared under the same conditions and a series of dye decomposition kinetic study was conducted. The factors of study include agitation speed, initial azo dye concentration, initial pH and reaction temperature. The dye decomposing efficiency performed in a batch reactor with UV light was used to evaluate the optimal preparation conditions. The proper conditions of photocatalytic for i-PrOH/TTIP volume ratio is 5, coating times is 15, drying time is 15 minute, calcination temperature is 400℃, and calcination time is 0.5 hr. A revised kinetic mechanism and model proposed from literature was introduced to describe the kinetics for dye decomposition. The simplified explicit reaction rate derived in this study can fit the experimental data with a good agreement. The better understanding of the photocatalytic kinetics and the operative conditions for the process could give great opportunities for its application to the destruction of environmental organic contaminants.
Advisor Committee Tai-shang Chen - advisor
Fu-chang Huang - co-chair
Jia-ming Chern - co-chair
Files Date of Defense 2008-07-29 Date of Submission 2008-08-28