Firstly,hollow chestnut TiO2 carrier was prepared by hydrothermal method with TiCl4 as titanium source.Then,using PbI2 and MAI as precursors,MAPbI3 thin films were constructed on hollow chestnut TiO2 by solution method to form hollow chestnut MAPbI3/TiO2 composite photocatalyst.Taking toluene as the target degradation material,the catalytic degradation performance of chestnut MAPbI3/TiO2 composite photocatalyst under visible light was investigated,and the energy level structure of the material was analyzed to reveal the degradation mechanism of the material.The results show that the composition and morphology of perovskite MAPbI3 thin films are closely related to the feed ratio of PbI2 and MAI.With the increase of feed ratio of PbI2,the composition of the thin films changes from MAPbI3 and MAI to pure MAPbI3 and then to MAPbI3 and PbI2.The chestnut MAPbI3/TiO2 with matched energy level and special structure can not only reduce the recombination rate of photogenerated electrons and holes,but also effectively transfer the photogenerated electrons and holes to the conduction band of MAPbI3 and TiO2 valence band respectively,promoting the generation of active particles·O2-and·OH,so it has better performance in the degradation of toluene.Under the irradiation of visible light,the degradation rate of MAPbI3/TiO2 was up to 98%in 90 min.
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