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首页> 美国政府科技报告 >Kinetic Studies in Heterogeneous Photocatalysis. 2. TiO2-Mediated Degradation of 4-Chlorophenol Alone and in a Three-Component Mixture of 4-Chlorophenol, 2,4-Dichlorophenol, and 2,4,5-Trichlorophenol in Air-Equilibrated Aqueous Me
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Kinetic Studies in Heterogeneous Photocatalysis. 2. TiO2-Mediated Degradation of 4-Chlorophenol Alone and in a Three-Component Mixture of 4-Chlorophenol, 2,4-Dichlorophenol, and 2,4,5-Trichlorophenol in Air-Equilibrated Aqueous Me

机译：非均相光催化动力学研究。 2.二氧化钛介导的四氯苯酚单独和在空气平衡水溶液中的4-氯苯酚，2,4-二氯苯酚和2,4,5-三氯苯酚的三组分混合物的降解

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The kinetics of the TiO2-mediated photocatalyzed degradation of 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP) and 2,4,5-trichlorophenol (2,4,5-TCP) have been investigated. The heterogeneous photodegradation of 4-CP proceeds through formation of intermediates which are subsequently rapidly and totally mineralized to CO2 and HC1. Hydroquinone (HQ) is the major intermediate. The dependence of the photodegradation rate of 4-CP in an annular photoreactor on the initial 4-CP concentration, (4-CP), shows that saturation coverage of the TiO2 particle surface-active sites is achieved, as no further increase in the rate of degradation is obtained with further increase in (4-CP). This indicates that the Langmuir-Hinshelwood (L-H) kinetic model appropriately describes the results; as required by this model, degradation occurs on the TiO2 particle surface. Keywords: Organic chemistry, Photochemistry, Phenols, Chemical reactions. (JES)

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