Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (11): 2107-2112.doi: 10.3866/PKU.WHXB201409041

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Synthesis of Ag3PO4/BiVO4 Composite Photocatalyst and Its Photocatalytic Degradation of Dyes under Visible Light Irradiation

GE Ming, TAN Mian-Mian, CUI Guang-Hua   

  1. College of Chemical Engineering, Hebei United University, Tangshan 063009, Hebei Province, P. R. China
  • Received:2014-06-23 Revised:2014-09-04 Published:2014-10-30
  • Contact: GE Ming, CUI Guang-Hua E-mail:geminggena@163.com;tscghua@126.com
  • Supported by:

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

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 words: Silver phosphate, Bismuth vanadate, Visible light, Photocatalysis, Dye, Mechanism

MSC2000: 

  • O644