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Acta Phys. Chim. Sin.  2014, Vol. 30 Issue (11): 2107-2112    DOI: 10.3866/PKU.WHXB201409041
CATALYSIS AND SURFACE SCIENCE     
Synthesis of Ag3PO4/BiVO4 Composite Photocatalyst and Its Photocatalytic Degradation of Dyes under Visible Light Irradiation
GE Ming, TAN Mian-Mian, CUI Guang-Hua
College of Chemical Engineering, Hebei United University, Tangshan 063009, Hebei Province, P. R. China
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Abstract  

Silver phosphate/bismuth vanadate (Ag3PO4/BiVO4) composite photocatalysts were successfully synthesized by coupling a reflux method with an in situ precipitation route. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy were used to characterize the as-prepared products. The XRD and FESEM results showed that Ag3PO4/BiVO4 composite photocatalysts were successfully obtained. An energy-efficient light emitting diode lamp was used as the visible light source, and the photocatalytic performances of the as-synthesized products were evaluated for dye degradation in a low-cost photocatalytic system. The Ag3PO4/BiVO4 composite with a Ag3PO4:BiVO4 molar ratio of 1:3 exhibited much higher photocatalytic activity than pure Ag3PO4 catalyst, resulting in decreased use of Ag3PO4. The Ag3PO4/BiVO4 composite photocatalyst showed the best photoactivity in neutral solution and had a higher photodegradation rate for cationic dyes than anionic dyes. The superoxide radicals (O2) and holes (h+) were considered to be the main active species in the Ag3PO4/BiVO4 system. The photocatalytic activity of the Ag3PO4/BiVO4 composite photocatalyst decreased to different degrees after three cycles because of the production of metallic silver.



Key wordsSilver phosphate      Bismuth vanadate      Visible light      Photocatalysis      Dye      Mechanism     
Received: 23 June 2014      Published: 04 September 2014
MSC2000:  O644  
  O649  
Fund:  

The project was supported by the Natural Science Foundation of Hebei Province, China (B2014209182) and Youth Foundation of Hebei Education Department, China (QN2014045).

Corresponding Authors: GE Ming, CUI Guang-Hua     E-mail: geminggena@163.com;tscghua@126.com
Cite this article:

GE Ming, TAN Mian-Mian, CUI Guang-Hua. Synthesis of Ag3PO4/BiVO4 Composite Photocatalyst and Its Photocatalytic Degradation of Dyes under Visible Light Irradiation. Acta Phys. Chim. Sin., 2014, 30(11): 2107-2112.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201409041     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2014/V30/I11/2107

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