Citation: LONG Ming-Ce, WAN Lei, ZENG Ceng, LIU Yi-Yi, CHEN Yuan-Yuan. Enhanced Visible Light Activity of BiVO₄ by Treating in HCl Aqueous Solution and Its Mechanism[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201209032 shu

Enhanced Visible Light Activity of BiVO₄ by Treating in HCl Aqueous Solution and Its Mechanism

1.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Received Date: 19 July 2012
Available Online: 3 September 2012
Fund Project: 国家自然科学基金(20907031)资助项目 (20907031)

Enhanced photocatalytic activity of BiVO₄ has been achieved by immersing in HCl aqueous solution. After treated for 6 h in 0.1 mol·L^-1 HCl solution, the visible light activity of BiVO₄ for phenol degradation increased by 3.5 times. X-ray diffraction (XRD), scanning electron microscopy (SEM), and diffuse reflectance spectroscopy (DRS) were carried out to analyze the crystal components and surface morphology of the treated samples. Comparison of samples treated in different acids and chlorides indicated that with the appropriate concentrations of H⁺ and Cl^- ions, BiVO₄ partially dissolved, was deposited as BiOCl, and finally a composite of flaked BiOCl and micro-particles of BiVO₄ with pits formed over the surface. The flatband potential of BiOCl was measured by a slurry method. According to the results of energy band analyses and photocatalytic activity tests of mixed BiVO₄ and BiOCl particles, there is no interparticle electron transfer effect between them. Therefore, the mechanism of the enhanced photocatalytic performance of the treated BiVO₄ can be attributed to the unevenness of the surface, which can facilitate photogenerated charge separation. This type of surface treatment method could be developed into an effective method for preparing photocatalysts with enhanced photocatalytic performance.
- Photocatalysis,
- Bismuth vanadate,
- Bismuth oxychloride,
- Heterojunction,
- Surface nanostructure,
- Visible light activity,
- Phenol degradation
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Enhanced Visible Light Activity of BiVO4 by Treating in HCl Aqueous Solution and Its Mechanism

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通讯作者: 陈斌, bchen63@163.com

Enhanced Visible Light Activity of BiVO₄ by Treating in HCl Aqueous Solution and Its Mechanism