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- W2024613460 abstract "The mechanism of photoreduction of CCl_4 on illuminated TiO2 surfaces was investigated by selectively trapping transient free radical intermediates. Dichlorocarbene and trichloromethyl radical were trapped with 2,3-dimethyl-2-butene during the photocatalytic degradation of CCl_4. The rate of formation of trapped :CCl_2 and •CCl_3 was found to be a function of [H_2O], pH, [CCl_4], the nature of the dissolved gas, and light intensity. Dissolved oxygen was not essential for the degradation of CCl_4. The production rate of trapped dichlorocarbene showed light intensity dependencies of second, first, and half order with progressively increasing light intensity. A two-electron photoreductive pathway (via dichlorocarbene formation) was found to be the dominant mechanism leading to the full degradation of CCl_4. Since dichlorocarbene is hydrolyzed under basic conditions, the pH and water concentration were found to be integral parameters controlling the complete degradation of CCl_4 to CO, CO_2, and HCl. Kinetic equations describing the formation of trapped dichlorocarbene were derived from a proposed mechanism. The comparison of the predicted rate expression to the observed data suggested that the observed two-electron transfer occurred consecutively." @default.
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- W2024613460 date "1996-01-01" @default.
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- W2024613460 title "Kinetics and Mechanism of CCl<sub>4</sub> Photoreductive Degradation on TiO<sub>2</sub>: The Role of Trichloromethyl Radical and Dichlorocarbene" @default.
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- W2024613460 doi "https://doi.org/10.1021/jp951431k" @default.
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