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URN etd-0903113-134108 Statistics This thesis had been viewed 1261 times. Download 306 times. Author Bo-syuan Huang Author's Email Address No Public. Department Chemical Engineering Year 2012 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 131 Title PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE BY BROOKITE/ANATASE TiO2 MIXTURE Keyword methylene blue TiO2 brookite anatase photocatalytic photocatalytic anatase brookite TiO2 methylene blue Abstract The brookite-TiO2 was prepared with TiCl4 as the precursor and the hydrolysis-TiO2 was prepared with TNBT as the precursor by hydrolysis process. Both photocatalysts were characterized by diffuse reflectance spectra (DRS), spectroscopic X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray microanalyses (SEM) and Brunauer-Emmett-Teller sorptometer (BET).
The XRD results show that the prepared brookite-TiO2 by hydrolysis method, dried at room temperature (B-RT) and heat treatment at 100oC (B-100) for 2 hrs in an oven, has pure brookite-phase. The rutile phase is increasing with increasing heat treatment temperature. The surface area and brookite phase are decreasing with increasing heat treatment temperature.
The photocatalytic efficiency of the prepared brookite-TiO2 was evaluated by UV/Vis spectrophotometer to determine the concentration of methylene blue (MB). By the pseudo-first-order kinetic expression, the rates of photocatalytic degradation are affected by the photocatalyst heat treatment temperature, loading dosage, ratio of mixing phase, initial concentration of MB and the availability of ultrasound.
The photocatalytic activity of anatase/brookite composite by physical method is better than single phase, i.e., anatase or brookite phase. The hydrolysis-TiO2 is about 70%anatase: 30%brookite composite by chemical method. The physical method of 50%brookite: 50%anatase in this study has the same photocatalytic efficiency in composion with the chemical method.
Advisor Committee Rong-chi Wang - advisor
Lii-ping Leu - co-chair
Tai-shang Chen - co-chair
Files Date of Defense 2013-07-29 Date of Submission 2013-09-03