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Preparation of BiVO4 Hollow Spheres and its Photocatalytic Degradation of Methylene Blue
Zhan-ying Ma,Bing-hua Yao*
Author NameAffiliationE-mail
Zhan-ying Ma Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710054, ChinaCollege of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Bing-hua Yao* Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710054, China bhyao@xaut.edu.cn 
Abstract:
Monoclinic BiVO4 hollow nanospheres were successfully prepared via template-free method using citric acid (C6H8O7) as chelating agent and characterized by X-ray diffraction patterns, transmission electron microscope, UV-Vis DRS, and TG-DTA technique. C6H8O7 played an important role in the formation of hollow spheres. Morphology observations revealed that when appropriate amount ofC6H8O7 was introduced, the cavity with the diameter of 40 nm was obtained in BiVO4 nanospheres. UV-Vis diffuse reflectance spectra indicated that the samples had absorption in both UV and visible light region. The photocatalytic activities were evaluated by the degradation of methylene blue under Xe lamp irradiation. Hollow spheres endow BiVO4samples with greatly improved photocatalytic activity. A possible formation mechanism of hollow spheres was proposed.
Key words:  BiVO4, Preparation, Hollow spheres, Photocatalysis
FundProject:
BiVO4空心微球的合成及其光催化降解亚甲基蓝的性能研究
马占营,姚秉华*
摘要:
以BiNO3·5H2O和NH4VO3为原料,柠檬酸为络合剂,成功合成了BiVO4空心纳米球.采用TEM、XRD、UV-Vis等测试技术对样品的形貌、相结构以及光吸收性能等进行了表征.结果表明,所制备的BiVO4空心微球在紫外区和可见区均有较强的光吸收,空心球平均粒径为160 nm,空腔直径为10~80 nm.以亚甲基蓝染料溶液的脱色降解实验为模型反应研究了样品的光催化性能.光催化实验结果表明,在可见光照射下,反应150 min后,样品对亚甲基蓝溶液的脱色率可达到95%以上.此外,考察了柠檬酸添加量对空心球形貌的影响,并提出了BiVO4空心纳米球的可能形成机理.
关键词:  BiVO4,合成,空心球,光催化
DOI:10.1063/1674-0068/26/03/341-346
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