In order to obtain a recyclable photocatalyst for efficient degradation of organic pollutants under visible light, TiO2 nanorod arrays were modified with Bi2 MoO6 nanosheets by hydrothermal solvothermal two-step method to obtain Bi2 MoO6/TiO2 composite. The morphology, structure, chemical element composition and optical properties of Bi2 MoO6/TiO2 photocatalyst were analyzed, and the photoelectrochemical and photocatalytic properties of Bi2 MoO6/TiO2 photocatalyst were tested with the help of electrochemical workstation in order to analyze the mechanism of enhanced photocatalytic activity. The results show that modification of TiO2 nanorod arrays by Bi2 MoO6 with narrow gap broadens the spectral response range, promotes the effective separation and transfer of photogenerated carriers, and obtains significantly enhanced photocatalytic degradation efficiency of methylene blue. The energy band structure diagram shows that type II heterojunction is formed between TiO2 and Bi2 MoO6 , which promotes the separation and transfer of photogenerated electron holes. The synergistic effect between type II band structure of Bi2 MoO6/TiO2 and the extended absorption of visible light is the internal mechanism for the improvement of photocatalytic properties.
关键词
印染废水处理/光催化降解/光降解机制/溶剂热法/可见光催化剂
Key words
printing and dyeing wastewater treatment/photocatalytic biodegradation/photo-degradation mechanism/solvothermal method/visible light catalyst
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