BiOBr/板钛矿相TiO_2的制备及光催化性能研究
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摘要
采用溶剂热法制备了BiOBr/板钛矿相TiO_2复合材料,并对其物相、形貌特征和光催化性能等进行了表征。结果表明,制备出的复合材料由板钛矿相TiO_2纳米颗粒和BiOBr花球组成。随着BiOBr花球含量的增多,BiOBr/板钛矿相TiO_2复合材料的光催化性能逐渐增强,这主要归因于在复合材料中形成了BiOBr/TiO_2异质结,拓宽了TiO_2的光响应范围,有利于光生载流子的迁移,提高了光生电子-空穴对的分离效率,从而相较于各单一组分表现出更高的光催化活性。
BiOBr/brookite TiO_2 composites were prepared by solvothermal method. Experimental tests were used to characterize the crystalline phase,morphology and the optical properties of samples. It was found that composites were combined with brookite TiO_2 nanoparticles and BiOBr spherical particles. The BiOBr/brookite TiO_2 composites exhibited higher photocatalytic activity than brookite TiO_2 and pure BiOBr for the degradation of Rh B under artificial solar light irradiation. The enhanced photocatalytic performance of composites was closely related to the heterojunctions between brookite TiO_2 and BiOBr,which can not only broaden the light adsorption range of TiO_2,but also improve the electronhole separation efficiency under artificial solar light irradiation.
BiOBr/brookite TiO_2 composites were prepared by solvothermal method. Experimental tests were used to characterize the crystalline phase,morphology and the optical properties of samples. It was found that composites were combined with brookite TiO_2 nanoparticles and BiOBr spherical particles. The BiOBr/brookite TiO_2 composites exhibited higher photocatalytic activity than brookite TiO_2 and pure BiOBr for the degradation of Rh B under artificial solar light irradiation. The enhanced photocatalytic performance of composites was closely related to the heterojunctions between brookite TiO_2 and BiOBr,which can not only broaden the light adsorption range of TiO_2,but also improve the electronhole separation efficiency under artificial solar light irradiation.
引文
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[7]Lu Y Y,Zhang Y Y,Zhang J.In situ loading of CuS nanoflowers on rutile TiO_2surface and their improved photocatalytic performance[J].Applied Surface Science,2016,370:312-319.
[8]Li H,Liu J,Qian J,et al.Preparation of Bi-doped TiO_2nanoparticles and their visible light photocatalytic performance[J].Chinese Journal of Catalysis,2014,35(9):1578-1589.
[9]Li G S,Zhang D Q,Yu J C.A new visible-light photocatalyst:CdSquantum dots embedded mesoporous TiO_2[J].Environmental Science&Technology,2009,43(18):7079-7085.
[10]Kwon Y T,Kang Y S,Wan I L,et al.Photocatalytic Behavior of WO3-Loaded TiO_2in an Oxidation Reaction[J].Journal of Catalysis,2000,191(1):192-199.
[11]Hara M,Kondo T,Komoda M,et al.Cu2O as a photocatalyst for overall water splitting under visible light irradiation[J].Chemical Communications,1998,3(3):357-358.
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[13]Zhao Y,Huang X,Tan X,et al.Fabrication of BiOBr nanosheets@TiO_2nanobelts p-n junction photocatalysts for enhanced visible-light activity[J].Applied Surface Science,2016,365:209-217.
[14]Chen J,Guan M L,Cai W Z,et al.The dominant{001}facetdependent enhanced visible-light photoactivity of ultrathin BiOBr nanosheets[J].Physical Chemistry Chemical Physics,2014,16:20909-20914.
[15]Wei X X,Cui H,Guo S,et al.Hybrid BiOBr-TiO_2nanocomposites with high visible light photocatalytic activity for water treatment[J].Journal of Hazardous Materials,2013,263:650-658.
[16]Wang X H,Li J G,Kamiyama H,et al.Wavelength-sensitive photocatalytic degradation of methyl orange in aqueous suspension over iron(III)-doped TiO_2nanopowders under UV and visible light irradiation[J].The Journal of Physical Chemistry B,2006,110(13):6804-6809.