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

doi:10.7503/cjcu20140003

Abstract

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:

O649.4

ZHU Suiyi, XU Dongfang, FANG Shuai, GENG Zhi, YANG Xia. Sunlight-Responsive Ag₂S/Ag₃PO₄ Composite Preparation and Degradation of Salicylic Acid^†[J]. Chemical Journal of Chinese Universities, 2014, 35(6): 1286-1292.

Figures/Tables 12

Fig.1 SEM images of Ag3PO4(A) and 1%Ag2S/Ag3PO4(B) treated by hydrothermal 120 ℃ for 4 h, and EDS of 1%Ag2S/Ag3PO4(C)

Fig.2 X-Ray diffraction patterns of Ag3PO4(a), 1%Ag2S/Ag3PO4(b) and 20%Ag2S/Ag3PO4(c) treated at 120 ℃ for 4 h

Fig.3 X-Ray diffraction patterns of 1%Ag2S/Ag3PO4 treated at 40 ℃(a), 120 ℃(b), 160 ℃(c) for 4 h

Fig.4 XPS spectra of Ag3d(A), P2p(B) and O1s(C) of Ag3PO4(a) and 1%Ag2S/Ag3PO4(b) treated at 120 ℃ for 4 h

Fig.5 UV-Vis DR spectra for Ag3PO4(a), 0.5%Ag2S/Ag3PO4(b), 1%Ag2S/Ag3PO4(c) and 2%Ag2S/Ag3PO4(d) with hydrothermal treated at 120 ℃ for 4 h

Fig.6 Influence of Ag2S doping in Ag2S/Ag3PO4 with hydrothermal treated at 120 ℃ for 4 h on degradation of salicylic acida. Ag3PO4; b. 0.5%Ag2S/Ag3PO4; c. 1%Ag2S/Ag3PO4; d. 2%Ag2S/Ag3PO4.

Fig.7 Influence of hydrothermal temperature of 1%Ag2S/Ag3PO4 with hydrothermal treated for 4 h on degradation of salicycic acida. 40 ℃; b. 80 ℃; c. 120 ℃; d. 160 ℃.

Fig.8 Influence of hydrothermal time of 1%Ag2S/Ag3PO4 with hydrothermal treated at 120 ℃ on degradation of salicylic aeidTime/h: a. 2; b. 4; c. 8; d. 16.

Fig.9 Influence of different light source current intensity on degradation of salicylic acid by 1%Ag2S/Ag3PO4pH value of salicylic acid is 6.0; c0=20 mg/L; amount of catalysts is 0.15 g. I/A: a. 10; b. 15; c. 20.

Fig.10 Influence of initial pH value in solution on degradation of salicylic acid by 1%Ag2S/Ag3PO4Light source current intensity is 15 A; the amount of catalysts is 0.15 g; c0=20 mg/L. a. pH=4.0; b. pH=6.0; c. pH=8.0.

Fig.11 Photolysis of salicylic acid(a) and influence of catalyst amount(c—d) on degradation of salicylic acid by 1%Ag2S/Ag3PO4Light source current intensity is 15 A; V=100 mL, pH=6.0; c0=20 mg/L. m(1%Ag2S/Ag3PO4)/g: a. 0; b. 0.05; c. 0.15; d. 0.25.

Fig.12 Influence of initial concentration of salicylic acid on degradation of salicylic acid by 1%Ag2S/Ag3PO4Light source current intensity is 15 A; pH value is 6.0; the amount of catalysts is 0.15 g. csalicylic acid/(mg·L-1): a. 10; b. 20; c. 30.

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

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