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URN etd-0915114-120642 Statistics This thesis had been viewed 1548 times. Download 348 times. Author Wei-Fung Hung Author's Email Address No Public. Department Chemical Engineering Year 2013 Semester 1 Degree Master Type of Document Master's Thesis Language English Page Count 195 Title A Comparative Study of Different Methods to Prepare
TiO2 for Sonophotocatalytic Degradation of 2,4-dichlorophenoxyacetic Acid
Keyword brookite. anatase probe-type ultrasound sonophotocatalysis TiO2 2'4-dichlorop -henoxyacetic acid 2'4-dichlorop -henoxyacetic acid TiO2 sonophotocatalysis probe-type ultrasound anatase brookite. Abstract The sonophotocatalytic degradation of 2,4- dichlorophenoxyacetic acid (2,4-D) under ultraviolet irradiation combined with probe-type ultrasound was carried out in a jacketed glass reactor.
Four synthetic methods were used to prepare titanium oxide powder. The chemical and physical properties of the photocatalyst samples were determined by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV–vis diffuse reﬂectance spectra (UV-vis), also the specific surface area of all samples was measured by BET method.
The sonophotocatalytic activity performance of photocatalyst was evaluated by UV-vis spectrophotometer to detect the concentration of 2,4-dichlorophenoxyacetic acid (2,4-D). Hydrolysis-TiO2 prepared at heat treatment temperature of 85oC has higher photocatalytic than the other synthetic methods prepared at low temperature heat treatment. It can be attributed to that the synergistic effect of heterojunction in anatase/brookite composite can inhibit recombination rate of electrons and holes pairs to improve sonophotodegradation performance.
The operating conditions such as probe size, power intensity, photocatalyst loading, initial pH value of solution, effect of additions, pulse time mode, gas supplying and different kinds of photocatalysts were investigated in batch sonophotocatalytic system, the effect of flow velocity in continuous sonophotocatalytic system was also studied.
Advisor Committee Rong-Chi Wanh - advisor
Lii-Ping Leu - co-chair
Tai-Shang Chen - co-chair
Files Date of Defense 2014-07-30 Date of Submission 2014-09-15