A series of Cu2O/Ag/g-C3N4 complexes were prepared by hydrothermal and in situ photoreduc-tion methods and characterized by XRD,IR,PL.The photocatalysis performance of the complexes was tested.Experimental results show that Ag and Cu2O are loaded onto the surface of g-C3N4 without dama-ging its structure.The degradation conversion of tetracycline was 94.3％ when the solution pH=6 and 20 mg 15％-Cu2O/Ag/g-C3N4 was used.The·OH,·O2-,and h+play major role in degradation of tetracycline over Cu2O/Ag/g-C3N4 .The improved photocatalytic performance of catalyst may be due to increasing specific surface area of g-C3N4 after addition of Ag and Cu2O to form heterojunctions,decreasing of band gap energy resulting in increased absorption range in the visible region,and inhibiting in recombina-tion of photogenerated electron-hole pairs.
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