摘要
采用一步水热法制备Bi2MoO6/BiVO4复合光催化剂.利用X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、高分辨透射电子显微镜(HRTEM)等手段对其晶体结构和微观结构进行了表征.结果表明,Bi2MoO6纳米粒子沉积在BiVO4纳米片表面从而形成异质结结构.紫外-可见漫反射光谱(UV-Vis DRS)表明所制备的Bi2MoO6/BiVO4异质结较纯相Bi2MoO6和BiVO4对可见光吸收更强.由于形成异质结结构及其光吸收性能使Bi2MoO6/BiVO4光催化活性有较大提高.可见光下(λ>420 nm)光催化降解罗丹明B(RhB)实验结果表明,Bi2MoO6/BiVO4光催化活性较纯相Bi2MoO6和BiVO4高.Bi2MoO6/BiVO4样品光催化性能提高的原因是Bi2MoO6和BiVO4形成异质结,从而有效抑制光生电子-空穴对的复合,增大了可见光吸收范围及比表面积.
A Bi2MoO6/BiVO4 photocatalyst with a heterojunction structure was synthesized by a one-pot hydrothermal method. Its crystal structure and microstructure were characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, and high-resolution transmission electron microscopy （HRTEM）. The FESEM and HRTEM images indicated that Bi2MoO6 nanoparticles were loaded on the surface of BiVO4 nanoplates to form a heterojunction. The ultraviolet visible （UV-Vis） diffuse reflection spectra （DRS） showed that the resulting Bi2MoO6/BiVO4 heterojunction possessed more intensive absorption within the visible light range compared with pure Bi2MoO6 and BiVO4. These excellent structural and spectral properties endowed the Bi2MoO6/BiVO4 heterojunction with enhanced photocatalytic activity. It was found that the Rhodamine B （RhB） degradation rate with Bi2MoO6/BiVO4 was higher than that with pure BiVO4 and Bi2MoO6 under visible light （λ〉420 nm） by photocatalytic measurements. The enhanced photocatalytic performance of the Bi2MoO6/BiVO4 sample can be attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the heterojunction between Bi2MoO6 and BiVO4, intensive absorption within the visible light range, and high specific surface area.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2014年第11期2113-2120,共8页
Acta Physico-Chimica Sinica
基金
supported by the National Natural Science Foundation of China(21407059,61308095)
Science Development Project of Jilin Province,China(20130522071JH,20130102004JC,20140101160JC)~~
