Title page for etd-0818110-120820


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URN etd-0818110-120820
Author Bo-cheng Guo
Author's Email Address No Public.
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Department Environmental Engineering
Year 2009
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Application of Sputtering Technology on Preparing Nano-sized Composite
Photocatalyst TiO2/ITO for Acetone Decomposition
Date of Defense 2010-06-10
Page Count 150
Keyword
  • decomposition efficiency of acetone
  • modified photocatalyst
  • sputtering technology
  • multi-layer sputtering process
  • photocatalytic oxidation
  • kinetic modeling
  • Abstract This study applied sputtering technology to prepare composite film
    photocatalyst TiO2/ITO for investigating the decomposition efficiency of
    acetone using composite TiO2/ITO made by single- and multi-layer
    processes. The influences of operating parameters, including sputtering
    operating parameters and photocatalytic operating parameters, on the
    decomposition efficiency of acetone were further investigated.
    Operating parameters investigated for the sputtering process included
    oxygen to argon ratio (O2/Ar), temperature, substrate, sputtering dutation,
    and sputtering layers, while operating parameters investigated for the
    photocatalytic decomposition of acetone included light wavelength, H2O
    concentration, O2 concentration, initial acetone concentration, and the
    type of photocatalysts.
    In the experiments, acetone was degraded by the composite film
    photocatalyst TiO2/ITO in a self-designed batch photocatalytic reactor.
    Operating parameters included light wavelength (350~400 nm, 435~500
    nm, 506~600 nm), the type of photocatalysts (single-layer film
    photocatalyst TiO2/ITO with the thickness of 355.3, 396.6, 437.5, 487.5,
    and 637.5 nm; double- and triple-layer TiO2/ITO), H2O concentration (0,
    50, 100, 200, and 300 ppm). The incident light with different
    wavelength irradiated with three 15-W lamps of near UV light or LED
    lamps of blue and green lights placed on the top of the photocatalytic
    reactor. Acetone was injected into the reactor by using a gasket syringe
    and vaporized for further photocatalytic degradation on the film
    photocatalyst TiO2/ITO placed at the bottom of the reactor. Air samples
    were taken to analyze acetone concentration with a GC/FID.
    The composite film photocatalyst TiO2/ITO was mainly composed
    of anatase with a few rutile. The thicknesses of the single- and
    IV
    double-layer film photocatalyst with the thickness of 473.5 nm and 506.0
    nm, respectively. Experimental results indicated that the highest
    decomposition efficiency of acetone was obtained by using TiO2/ITO,
    followed by TiO2/ground glass and TiO2/glass. The highest
    decomposition efficiency of acetone was observed by using TiO2/ITO at
    50°C, 20% O2, and 100 ppm H2O. In the kinetic model, the acetone
    decomposition of single-layer TiO2/ITO was zero-order reaction. The
    acetone decomposition of double-layer TiO2/ITO in high initial acetone
    concentration was zero-order reaction, while that in low initial acetone
    concentration was first-order reaction. Thus, the decomposition of
    acetone exerted by TiO2 film photocatalyst can be enhanced efficiently by
    ITO. Under the incidence of blue light, the reaction rate of acetone
    decomposition were 2.353×10-5 and 3.478×10-5 μmole/cm2-s for using
    single- and double-layer TiO2/ITO, respectively.
    Finally, a bimolecular Langmuir-Hinshelwood (L-H) kinetic model
    was applied to simulate the influences of initial acetone concentration,
    temperature, and relative humidity on the promotion and inhibition for
    the photocatalytic degradation of acetone. This study revealed that the
    L-H kinetic model could successfully simulate the photocatalytic reaction
    rate of acetone.
    Advisory Committee
  • Kee-Rong Wu - chair
  • Chung-Hsuang Hung - co-chair
  • Chao-Yin Kuo - co-chair
  • Chung-Shin Yuan - advisor
  • Files
  • etd-0818110-120820.pdf
  • indicate access worldwide
    Date of Submission 2010-08-18

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