Heterogeneous photocatalysis in titania-stabilized perfluorocarbon-in-water emulsions: Urea photosynthesis and chloroform photodegradation

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• 作者：Elena A. Ustinovich ; Dmitry G. Shchukin and Dmitry V. Sviridov
• 关键词：Photocatalysis ; Titania ; Emulsion ; Perfluorocarbon
• 刊名：Journal of Photochemistry and Photobiology A: Chemistry
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：175
• 期：2-3
• 页码：249-252
• 全文大小：169 K

文摘

The photocatalytic behaviour of perfluorodecalin-in-water emulsions stabilized by bare and Cu-modified nanodispersed TiO₂ has been studied using, as the model reactions, the simultaneous photoreduction of CO₂ and NO₃⁻ to urea and the oxidative photodegradation of CHCl₃. It has been shown that the employment of emulsified perfluorocarbons, capable of dissolving large quantities of gaseous substrates, as the carriers of TiO₂ photocatalyst permits one to improve the selectivity of photoreduction and to enhance the urea photoproduction rate (by two to seven times depending on the nitrate concentration) due to high acting concentration of CO₂ involved into light-induced reaction at the interface and possibility of stabilizing the reaction intermediates in the case of two-phase reaction medium. It has also been demonstrated that the ability of perfluorocarbons to dissolve both oxygen and organics leads to the enhancement of CHCl₃ photodegradation in the TiO₂-stabilized perfluorocarbon-in-water emulsion and allows for combining extraction with photocatalytic decontamination.