Chemical Journal of Chinese Universities ›› 2014, Vol. 35 ›› Issue (6): 1286-1292.doi: 10.7503/cjcu20140003

• Physical Chemistry • Previous Articles     Next Articles

Sunlight-Responsive Ag2S/Ag3PO4 Composite Preparation and Degradation of Salicylic Acid

ZHU Suiyi, XU Dongfang, FANG Shuai, GENG Zhi*(), YANG Xia   

  1. College of Environment, Northeast Normal University, Changchun 130024, China
  • Received:2014-01-02 Online:2014-06-10 Published:2014-05-12
  • Contact: GENG Zhi E-mail:aaavbackkom@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.51238001, 51108069)

Abstract:

An efficient sunlight responsive Ag2S/Ag3PO4 composite was prepared by co-precipitation method combined with hydrothermal treatment. The morphology, composition, surface physical and chemical property and optical absorption property were characterized by scanning electron microscope(SEM), X-ray powder diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and ultraviolet-visible diffuse reflection(UV-Vis DR). The 1%Ag2S/Ag3PO4 composite has rough surface with smaller particle size less than 0.8 μm and wider bandgap(2.24 eV) compared to Ag3PO4. The photocatalytic activity of Ag2S/Ag3PO4 was evaluated by degradation of salicylic acid which is a typical material in pharmaceuticals and personal care products(PPCPs) and harmful to human health and ecosystems. The results show that Ag2S/Ag3PO4 composite doped 1%Ag2S with hydrothermal treated at 120 ℃ for 4 h exhibits excellent salicylic acid degradation efficiency reached to 88.2% under simulated sunlight irradiation for 60 min and the light source current intensity is 15 A, when Ag2S/Ag3PO4 used 0.15 g, the initial concentration of salicylic acid is 10 mg/L and pH is 6.0, respectively. The contribution of various parameters for the enhanced photocatalytic activities is revealed in detail. The primary reasons for the increased simulated sunlight photocatalyst activity are contribution to the perfect cubic crystal structure, smaller particle size and broaden the visible spectral response. Doping sulfide is benefit to absorb sunlight and separate the electron-hole effectively.

Key words: Silver sulfide, Silver phosphate, Photocatalysis, Simulated sunlight, Salicylic acid

CLC Number: