Dependence of the kinetics of liquid-phase photocatalyzed reactions on oxygen concentration and light intensity

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• 作者：Andrew Mills ; Jishun Wang and David F. Ollis
• 关键词：Photocatalysis ; Oxygen ; 4-Chlorophenol ; Titania ; Pseudo-first order
• 刊名：Journal of Catalysis
• 出版年：2006
• 出版时间：1 October 2006
• 年：2006
• 卷：243
• 期：1
• 页码：1-6
• 全文大小：170 K

文摘

The initial kinetics of the oxidation of 4-chlorophenol, 4-CP, photocatalyzed by titania films and aqueous dispersions were studied as a function of oxygen partial pressure, P_O2, and incident light intensity, I. The reaction conditions were such that the kinetics were independent of [4-CP] but strongly dependent on P_O2—a situation that allowed investigation of the less-often studied kinetics of oxygen reduction. The observed kinetics fit a pseudo-steady-state model in which the oxygen is Langmuir-adsorbed on the titania photocatalyst particles before being reduced by photogenerated electrons. The maximum rate of photocatalysis depends directly on handle=V-WA-A-W-WV-MsSWYVW-UUW-U-AAZCBUVYYB-AAZWYYCZYB-VBBVWYZC-WV-U&_acct=C000050221&_version=1&_userid=10&md5=f3189cb93b9a0dc14a2d10811c1c1233"" title=""Click to view the MathML source"">I^β, where handle=V-WA-A-W-WV-MsSWYVW-UUW-U-AAZCBUVYYB-AAZWYYCZYB-VBBVWYZC-WV-U&_acct=C000050221&_version=1&_userid=10&md5=b793088c596e2dbe379f8eebf0d93163"" title=""Click to view the MathML source"">β