A series of BiVO4 loaded ZnS quantum dots nanocomposites are prepared with BiVO4 nanorods as carriers through co-precipitation method at room temperature,and their composition,structure,and morphology are characterized by means of SEM,TEM,XRD,and FT-IR.Taking tetracycline(TC)as a targeted pollutant,the photocatalytic performance of ZnS/BiVO4 nanocomposites is evaluated.Compared with pure ZnS or BiVO4,ZnS/BiVO4 composites show a significantly enhanced photocatalytic performance for tetracycline degradation.Among them,ZnS/BiVO4-2/1 sample with a Zn/Bi molar ratio of 2/1 demonstrates the best photocatalytic performance for tetracycline degradation,over which more than 83.5％of tetracycline is removed within 60 min under the optimum conditions.It is confirmed through free radicals quenching experiment that photo generated holes(h+),superoxide radicals(·O2),and hydroxyl radicals(·OH)all play significant roles during the photocatalytic degradation process of tetracycline.A Z-type heterojunction mechanism is proposed for expounding ZnS/BiVO4-2/1 photocatalytic performance in degradation of tetracycline.
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