Abstract
Ag/Ag2O/Ag2CO3 microcomposite was fabricated by a one-step hydrothermal route from AgNO3, NaHCO3, and Poly(N-vinylpyrrolidone) (PVP), utilizing PVP as the reducing agent. X-ray diffraction, X-ray photoelectron spectroscopy, and high resolution transmission electron microscopy results confirmed the forming of Ag/Ag2O/Ag2CO3 microcomposite was achieved by this hydrothermal method. UV–vis diffuse reflectance spectra of both pure Ag2CO3 and Ag/Ag2O/Ag2CO3 microcomposite displayed a band gap edge at about 390−420nm. Compared with pure Ag2CO3, an enhanced broad tail from approximately 400–800nm appeared in the UV–vis diffuse reflectance spectrum of Ag/Ag2O/Ag2CO3 microcomposite. The photocatalytic results indicated that the as-synthesized Ag/Ag2O/Ag2CO3 microcomposite was a kind of promising photocatalyst in remediation of water polluted by some chemically stable azo dyes under visible light irradiation.
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