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TiO2/BiVO4, a Heterojuncted Microfiber with Enhanced Photocatalytic Performance for Methylene Blue under Visible Light Irradiation
Zhan-ying Ma*,Xiao-bo Li,Cai-hua Zhou,Ling-juan Deng,Guang Fan
Author NameAffiliationE-mail
Zhan-ying Ma* College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China mazhanying@163.com 
Xiao-bo Li College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Cai-hua Zhou College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Ling-juan Deng College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Guang Fan College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Abstract:
Novel TiO2/BiVO4 microfiber heterojunctions were constructed using cotton as biomorphic templates. The as-synthesized samples were characterized by scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra and photocatalytic experiment. The morphology of the as-synthesized TiO2/BiVO4 composites was consisted of a large quantity of microfiber structures with diameter from 2.5 μm to 5 μm, and the surface of samples became more coarse and compact with the increase of weight ratio of TiO2. The TiO2/BiVO4 samples with proper content (10.00wt%) showed the highest pho-tocatalytic degradation activity for methylene blue (MB) degradation among all the samples under visible light, and 88.58%MB could be degraded within 150 min. The enhancement of photocatalytic activity was mainly attributed to the formation of n-n heterojunction at the contact interface of TiO2 and BiVO4, which not only narrowed the band gap of BiVO4 for extending the absorption range of visible light, but also promoted the transfer of charge carriers across interface. A possible photodegradation mechanism of MB in the presence of TiO2/BiVO4 microfibrous photocatalyst was proposed.
Key words:  TiO2/BiVO4  Microfiber  Visible-light-response  Photocatalysis
FundProject:This work was supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department (No.2013JK0690), Fundamental Research Funds of Xianyang Normal University (No.14XSYK011, No.12XSYK025), Shaanxi Province Natural Science Foundation (No.2015JQ5188)
纤维状TiO2/BiVO4异质结的高可见光光催化性能
马占营*,李小博,周彩华,邓玲娟,范广
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DOI:10.1063/1674-0068/30/cjcp1609175
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