A stable and active AgxS crystal preparation and its performance as photocatalyst

doi:10.1016/S1872-2067(14)60288-6

Abstract

Abstract:

Ag_xS crystals were synthesized via hydrothermal (Ag_xS-H) and in situ ion-exchange (Ag_xS-IE) methods. The samples were characterized by scanning electron microscopy, X-ray diffraction, ultraviolet-visible-near infrared absorption spectroscopy, N₂ adsorption-desorption, X-ray photoelectron spectroscopy and surface photovoltage measurements. The photocatalytic performance was investigated for the decomposition of methyl blue (MB) under visible light irradiation (λ ≥ 420 nm). The Ag_xS-H had smaller particles, wider band gap and weaker recombination of photoinduced charges than Ag_xS-IE, resulting in a higher photocatalytic activity. Moreover, Ag_xS-H was stable, and could be reused five times without loss of photocatalytic activity. Additionally, a possible pathway for the photocatalytic degradation of MB over Ag_xS has been proposed, that MB was oxidized mainly by hydroxyl radicals and partly via electron holes generated in the Ag_xS. Ag_xS-H is an efficient photocatalyst and has great potential for the degradation of harmful organic dyes in wastewater.

Key words: Silver sulfide, Visible light irradiation, Photocatalytic degradation, Organic pollutants, Band gap

Pingjing Chang, Haiyang Cheng, Weiwei Lin, Xiaoru Li, Fengyu Zhao. A stable and active Ag_xS crystal preparation and its performance as photocatalyst[J]. Chinese Journal of Catalysis, 2015, 36(4): 564-571.

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A stable and active Ag_xS crystal preparation and its performance as photocatalyst

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