Photoelectrocatalytic oxidation of organic compounds at nanoporous TiO2 electrodes in a thin-layer photoelectrochemical cell
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A simple, rapid, and effective photoelectrochem. method is proposed to quant. characterize photocatalytic degrdn. behavior of org. compds. at nanoporous TiO2 film electrodes in a thin-layer photoelectrochem. cell. This method uses the charge obtained by integrating the photocurrent originating from the photocatalytic oxidn. of org. compds. to quantify the extent of degrdn. Complete mineralization was obsd. for all org. compds. investigated. A double-exponential kinetic rate expression was acquired using a computer simulation method, indicating two simultaneous kinetic processes. Photocurrent profiles of different org. compds. complied well with the proposed theor. model. Both pre-exponential and exponential consts. were obtained. The rate of the fast kinetic component is 10-25 times faster than that of the slow kinetic component. It was found that the identities of org. compds. have no significant effect on the photocatalytic oxidn. kinetics, whereas the availability of the org. compds. to capture photoholes plays a decisive role.
Journal of Catalysis