MoS2/Bi2WO6复合光催化剂的制备及可见光光催化性能研究

摘要

本文采用静电自组装法制备MoS2/Bi2WO6复合光催化剂,通过X射线衍射仪、扫描电子显微镜、透射电子显微镜和X射线光电子能谱仪等系统地表征了MoS2/Bi2WO6复合光催化剂的微观形貌、元素组成和晶体结构。以左氧氟沙星(LVFX)为目标降解物对MoS2/Bi2WO6复合光催化剂进行光催化活性测试,并分析其光催化降解机理。结果表明:负载MoS2量子点后,MoS2/Bi2WO6复合光催化剂的可见光吸收能力有所改善,光生载流子迁移效率明显提升。最优的MoS2/Bi2WO6复合光催化剂在可见光照射1 h后对LVFX的降解率达到83%,而Bi2WO6在可见光照射1 h后降解率仅为69%,复合光催化剂降解动力学常数为0.0183 min−1,降解速率是Bi2WO6的1.22倍。MoS2/Bi2WO6 composite photocatalystswere prepared by electrostatic self-assembly method in this paper. Themorphology, composition and structure of the MoS2/Bi2WO6 composite photocatalysts are systematically characterized by X-ray diffraction,scanning electron microscopy, transmission electron microscopy and X-rayphotoelectron spectroscopy. The photocatalytic degradation forlevofloxacin (LVFX) of MoS2/Bi2WO6 compositephotocatalysts were studied, and the photocatalytic mechanism was analyzed. Theobtained results indicated that both the visible light absorption capacity and the photogenerated carriermigration rates of MoS2/Bi2WO6 composite photocatalystswere significantly improved after loading MoS2 quantum dots. Thephotocatalytic degradation rate of the optimal MoS2/Bi2WO6 composite photocatalyst for LVFX reached 83%, while the degradation rate of Bi2WO6 was only 69% under visible light irradiation for 1 h. The degradation kineticconstant of the composite photocatalyst was 0.0183 min−1, which was1.22 times than that of Bi2WO6.