ZnS纳米粒子修饰FeWO4纳米棒增强可见光催化活性研究

ZnS nanoparticles modified FeWO4 nanorods to enhance visible light photocatalytic activity

采用两步水热辅助微乳液法,制备出硫化锌纳米粒子修饰钨酸亚铁纳米棒异质结光催化剂。TEM,EDS测试表明硫化锌纳米粒子均匀的负载在钨酸亚铁纳米棒表面。通过调节钨酸亚铁的加入量制备出了不同质量比的异质结光催化剂样品,与单独的硫化锌粒子和钨酸亚铁纳米棒相比,异质结构ZnS/FeWO4光催化剂对亚甲基蓝染料展现出高效的降解性能,其中0.2-ZnS/FeWO4样品4 h的降解率达到93%。异质结催化剂光催化性能的提高可以归因于异质结构的存在降低了光生电子和空穴的复合速率,加速了光生电子的转移,从而提高了量子效率。

ZnS nanoparticles modified FeWO4 heterostructure photocatalyst were fabricated by a two step hydrothermoal assisted microemulsion.TEM and EDS showed that the ZnS nanoparticles highly distributed onto the surface of FeWO4 nanorods.The composite photocatalysts with different mass ratio of ZnS and FeWO4 were synthesis according to adjusting the dosage of FeWO4.The heterostructure photocatalyst samples exhibited higher photocatalytic activity for MB dye degradation compared with the pure ZnS nanoparticles and FeWO4 nanorods under visible light radiation.Furthermore,the 0.2-ZnS/FeWO4 sample showed 93%degradation efficiency in 4 h.The improved photocatalytic activity can be attributed to the lower recombination rate of photogenerated electron-hole pairs and the efficient transfer of their corresponding carriers in the heterojunction area,which leading to a higher quantum efficiency.