Title page for etd-0827108-162825


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URN etd-0827108-162825
Author Yi-wei Peng
Author's Email Address m953030012@student.nsysu.edu.tw
Statistics This thesis had been viewed 5344 times. Download 1977 times.
Department Environmental Engineering
Year 2007
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Decomposition of Acetone by Nano-sized Photocatalysts Coated on Activated Carbon Cellulose-paper Filter
Date of Defense 2008-06-12
Page Count 133
Keyword
  • L-H kinetic model
  • photocatalytic reaction
  • activated carbon cellulose-paper filter (ACCF)
  • operating parameters
  • titanium dioxide (TiO2) photocatalyst
  • acetone decomposition
  • Abstract This study combined photocatalytic technology with activated carbon cellulose-paper filter (ACCF) adsorption to decompose gaseous pollutants. Gaseous pollutants were initially adsorbed by activated carbon and could be further decomposed by photocatalytic technology.
    This study selected acetone (CH3COCH3) as gaseous pollutants. Two market available photocatalysts (photocatalystsⅠandⅡ) were coated on ACCF by impregnation to decompose acetone in a batch photocatlytic reactor. Operating parameters investigated in this study included initial acetone concentration (4.1~10.2 μM), reaction temperature (40~70℃), and water vapor (0~20 %). The incident UV light of 365 nm was irradiated by a 20-watt low-pressure mercury lamp placing above the batch photocatalytic reactor. The ACCF coated with TiO2 was placed at the center of the photocatalytic reactor. Acetone was injected into the reactor by a gasket syringe to conduct the photocatalytic tests. Reactants and products were analyzed quantitatively by a gas chromatography with an electron capture detector (GC/DCD) and a flame ionization detector followed by a methaneizer (GC/FID-Methaneizer). Finally, a Langmiur-Hinshewood (L-H) kinetic model was proposed to describe the rate of photocatalytic reaction.
    Results obtained from the photocatalytic tests indicated that photocatalystⅡ was better than photocatalystⅠ for the decomposition of acetone. Experimental results indicated that the size range of self-produced TiO2 photocatalyst by sol-gel was 20~70 nm. The end products were mainly CO and CO2, which resulted in the mineralization ratio up to 98%. Results obtained from the operating parameter tests revealed that the increase of initial acetone concentration enhanced the amount of acetone adsorbed on ACCF, which however did not increase the reaction rate of acetone. Although the increase of reaction temperature could reduce the amount of acetone adsorbed on ACCF, the decomposition rate of acetone could be promoted, so as the yield rate and mineralization ratio of products (CO and CO2). The increase of water vapor could slightly decrease the amount of acetone adsorbed on ACCF. The competitive adsorption phenomenon between acetone and water molecules on active sites could decelerate the decomposion of acetone. Moreover, the ACCF would not be saturated since the adsorbed acetone could be further decomposed quickly by the photocatalysts, which made the TiO2/ACCF more effective on removing acetone and lasted longer than the conventional ACCF.
    Finally, a modified bimolecular Langmuir-Hinshelwood kinetic model was developed to investigate the influences of initial acetone concentration reaction, temperature, and relative humidity on the promotion and inhibition for the photocatalytic oxidation of acetone. The modified L-H kinetic model could successfully simulate the photocatalytic reaction rate of acetone. Thus, the reaction rate of acetone over TiO2/ACCF could be described by the modified L-H kinetic model.
    Advisory Committee
  • Yung-hsu Hsieh - chair
  • Chung-hsuang Hung - co-chair
  • Cheng-di Dong - co-chair
  • Cheng-di Dong - co-chair
  • Cheng-di Dong - co-chair
  • Chung-shin Yuan - advisor
  • Files
  • etd-0827108-162825.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2008-08-27

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