通过溶剂热法合成了BiOI_xCl_1-x复合材料,并以聚乙烯吡咯烷酮(PVP)调控结构制备PVP-BiOI_xCl_1-x。利用XRD、SEM、HRTEM、XPS、UV-Vis DRS对系列样品进行表征。以四环素为污染物,在可见光下考察BiOI_xCl_1-x和PVP-BiOI_xCl_1-x复合材料的光催化性能。结果表明,PVP-BiOI_xCl_1-x的光催化性能显著增强,其中0.6PVP-BiOI_0.5Cl_0.5在1 h内可以去除83.6%的四环素(20 mg/L)。电子自旋共振(ESR)测试发现,·O^-₂和·OH活性自由基是光催化降解的主要活性物质。增强的光催化性能主要归因于BiOI和BiOCl间Z型异质结构件,光生电子空穴转移效率显著改善。

BiOI_xCl_1-x composites are synthesized via solvothermal method,and in turn PVP-BiOI_xCl_1-x is prepared by using polyvinyl pyrrolidone (PVP) to control the micro-structure.The samples are characterized by means of XRD,SEM,HRTEM,XPS and UV-Vis DRS.The photocatalytic properties of BiOI_xCl_1-x and PVP-BiOI_xCl_1-x composites are investigated under visible light with tetracycline as the pollutant.The results indicate that PVP-BiOI_xCl_1-x has a significantly enhanced photocatalytic activity,of which 0.6PVP-BiOI_0.5Cl_0.5 can remove 83.6% of tetracycline (20 mg·L^-1) in 1 h.ESR test shows that ·O^-₂ and ·OH radicals are the main active substances in photocatalytic degradation.The enhancement of photocatalytic performance is mainly attributed to Z-type heterostructure between BiOI and BiOCl,therefore the photogenerated electron hole transfer efficiency is significantly improved.

朱敏(1986-),女,硕士,讲师,主要从事功能材料开发研究,zhumin@njucm.edu.cn。