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Performance and Mechanism in Photothermocatalytic Synergetic removal of nitrogen oxide on heterostructured composite

Project from:National Natural Science Foundation of China. Project leader:Wang Jin-Xiu Duration:2015.01-2017.12 Abstract: Presently, urban environments in China are facing serious problems concerning air pollution and nitrogen oxides are one of the main air pollutants. The photocatalytic oxidation method for nitrogen oxides removal has been one of the front research directions in the field of air pollution control, due to its merits including low cost, energy conservation, environmental friendliness and so on. On the problem that the traditional photocatalytic materials with TiO2 as the brandmark perform low efficiency in removal of nitrogen oxides, the project tries to select wide band gap semiconductors with photothermocatalytic synergetic effect such as TiO2 and CeO2 and narrow band gap semiconductors with visible light response such as Ag3VO4 and CuS to develop novel photothermocatalytic materials with heterostructure and wide spectrum response. Based on the modulation of structure and property, the prepared photothermocatalytic materials integrate the heterojunction barrier effect with photothermocatalytic synergetic effect. Their photothemocatalytic performances in the oxidation of nitrogen oxides with high concentration are studied at low temperature(<150 ℃)and under simulated solar light irradiation simultaneously. The regulating effect of the separation efficiency of photogenerated electron and hole, the rate of interface charge transfer and the solar energy utilization by the prepared photothermocatalytic materials are investigated and revealed. The distribution of active sites, the active species and their law of function are further studied. The mechanism in photothermocatalytic removal of nitrogen oxide on the photothermocatalytic material with heterojunction was investigated and proposed. This research provided new thought for increasing efficiency in photocatalytic removal of nitrogen oxides and low temperature catalytic removal of nitrogen oxides.

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