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Title page for etd-0915114-120642


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 indicate access worldwide
    Date of Defense 2014-07-30 Date of Submission 2014-09-15


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