Ag2 S/ZnS复合纳米球的制备及可见光催化性能

摘要

采用水热反应体系,结合离子交换法制备了多孔Ag2 S/ZnS纳米球,以甲基橙(MO)溶液为模拟污染物对其进行了可见光光催化降解研究.与ZnS相比,Ag2 S的加入提高了材料催化降解甲基橙的能力,其中Ag0.4 Zn0.8 S催化降解效果最好.光催化活性的增强主要归因于光诱导下ZnS和Ag2 S之间有效的界面电荷转移(IF-CT).%The novel porous Ag2 S/ZnS composite nanospheres were fabricated via a hydrothermal proce-dure followed by a cation exchange method. Its photocatalytic performance was also evaluated by the pho-tocatalytic decolorization of methyl orange ( MO) in aqueous solution under visible light irradiation. The results show that the composite nanospheres exhibited enhanced visible light photocatalytic activity com-pared with the initial porous ZnS nanospheres. Among them, sample of Ag0.4 Zn0.8 S gave the highest deg-radation rate. The enhanced photocatalytic activity was presumed to the result of the direct photoinduced interfacial charge transfer (IFCT) from the valence band (VB) of ZnS to Ag2S.