Abstract: ZnO and ZnO/Ag hybrid nanoparticles as photocatalyst were synthesized by different process of sol-gel method, with zinc acetate, silver nitrate as precursor and diethanolamine as stablizer. The content of Ag in all ZnO/Ag hybrid was 3 mol%. The structure and optical properties of samples were characterized by XRD, SEM, TEM, XPS, PL, UV-vis techniques, the photocatalytic activity of these samples was studied by analyzing the degradation of methyl orange. The results showed that the ZnO/Ag nanopowders prepared by different process dispersed uniformly and no obvious agglomeration phenomenon was observed. The face centered cubic metallic silver was attached on wurtzite ZnO to form heterojunction. Compared with pure ZnO, the photocatalytic activity of Ag loaded ZnO have largely improved. Among all samples, ZnO/Ag hybrid synthesized by one-step method had best photocatalytic activity with methyl orange entirely degraded under ultraviolet light irradiation for 70 minutes.
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