以BiVO₄纳米棒为载体,采用室温共沉淀法制备了BiVO₄负载ZnS量子点的纳米复合材料,利用SEM、TEM、XRD和FT-IR等对其组成、结构、形貌进行表征;以四环素(TC)为污染物,考察了ZnS/BiVO₄复合材料的光催化性能。结果表明,与纯ZnS和BiVO₄相比,ZnS/BiVO₄复合材料对TC光催化降解的性能显著增强,其中,Zn/Bi摩尔比为2/1的ZnS/BiVO₄-2/1样品对TC的降解效果最佳,1 h内TC(20 mg/L)清除率达到83.5%。自由基猝灭实验证实光生空穴(h⁺)、超氧自由基(·O^-₂)及羟基自由基(·OH)均在ZnS/BiVO₄-2/1样品光催化降解TC过程中发挥作用,初步阐述了ZnS/BiVO₄-2/1光催化TC降解的Z型异质结机理。

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 (·O^-₂),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.

冯好胜(1997-),男,硕士生,主要从事光催化研究,29133113856@qq.com