Citation:
CHEN Xi, LI Li, ZHANG Wen-Zhi, SONG Qiang, LI Yi-Xuan. Photocatalytic Performance and Photolysis Mechanism of Ag2S/ZnO with Visible-Light Response Prepared by Microwave Hydrothermal Two-Step Method[J]. Chinese Journal of Inorganic Chemistry,
;2015, 31(10): 1971-1980.
doi:
10.11862/CJIC.2015.269
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Under different synthetic condition, the Ag2S/ZnO photocatalyst with visible-light response was prepared by microwave hydrothermal two-step method. The phase structures, physicochemical properties and morphologies were well-characterized via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption (UV-Vis/DRS), Scanning electron microscopy (SEM) and N2 adsorption-desorption tests. Results indicate that the synthetic product is mainly hexagonal wurtzite ZnO, of which phase structure has been changed with the temperature of reaction and the nAg2S/nZnO increased. The presence of Ag2S enhances the light absorption of the photocatalyst under the visible-light region, redshifting the absorption band, and suppresses the growth of ZnO along the (001) crystal plane. In addition, with the nAg2S/nZnO increased, the morphology of synthetic Ag2S/ZnO realizes a transformation from the shape of popcorn to cylinder, moreover, the BET values reduce obviously. Compared to pure ZnO, when the nAg2S/nZnO was 1:10, the composite performs the highest photocatalytic activity to degrade Rhodamine B under the irradiation of ultraviolet, visible and simulated sunlight, far superior than P25 which was the most widely used at present. Moreover, there is no significant change in the degradation efficiency of Ag2S/ZnO 200° 1-10 after four times of recycling, which shows the photocatalytic stability to a certain extent. In addition, the capture experiments proved that holes brought out main effect on the photocatalytic reaction of Ag2S/ZnO. Accordingly, a potential reaction mechanism was proposed.
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