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    National Tsing Hua University Institutional Repository > 原子科學院  > 生醫工程與環境科學系 > 期刊論文 >  Photocatalytic degradation of parathion in aqueous TiO2 dispersion: The effect of hydrogen peroxide and light intensity

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/40187

    Title: Photocatalytic degradation of parathion in aqueous TiO2 dispersion: The effect of hydrogen peroxide and light intensity
    Authors: Chen TF;Doong RA;Lei WG
    教師: 董瑞安
    Date: 1998
    Publisher: ELSEVIER
    Relation: Water Science and Technology, Elsevier, Volume 37, Issue 8, 1998, Pages 65-71
    Keywords: apparent first-order rate constants
    hydrogen peroxide
    quantum efficiency
    titanium dioxide
    Abstract: ©1998 Elsevier - The photodegradation of parathion in the direct photolysis, UV/TiO2 UV/H2O2 and UV/TiO2/H2O2 systems was investigated at 25 degrees C. The effect of light intensity was also examined to clarify the relationship between the photo flux-and decomposition rate of parathion; Results of the study demonstrated that no obvious degradation of parathion in dark reaction occurred within 24 hours. However, the addition of TiO2 and/or H2O2 promotes the degradation efficiency of parathion. Adding H2O2 was more effective in the photocatalytic oxidation of parathion than TiO2. Also, hydrogen peroxide was found as an intermediate with the maximum concentration of 55 mu M in UV/TiO2 system during the photodegradation of parathion. A higher intensity of lamp could increase the degradation rate of parathion. However, the quantum efficiency for degradation of parathion decreased from 0.053 to 0.006 when light intensity increased from 100 W to 450W. Photodecomposition followed a pseudo-ftrst-order reaction. The rate constants of parathion ranged from 0.003 min(-1) for direct photolysis to 0.023 min(-1) for UV/TiO2/H2O2 system. This study indicated that photocatalytic degradation is a highly promising technology for detoxifying parathion.
    URI: http://www.elsevier.com/
    Appears in Collections:[生醫工程與環境科學系] 期刊論文

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