Ni-MoS_2/γ-Al_2O_3催化剂的制备及其光催化性能研究

Preparation and Catalytic Degradation Performance of Ni-MoS_2/γ-Al_2O_3 Catalyst

采用共沉淀结合水热合成方法,以γ-Al_2O_3为载体,制备出Ni-MoS_2/γ-Al_2O_3复合催化剂。采用X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)等方法对样品的结构与形貌进行表征。研究了MoS_2负载量、煅烧温度对NiMoS_2/γ-Al_2O_3复合催化剂光催化降解罗丹明B性能的影响,并考察了催化剂的循环使用性能。结果表明:负载量为30wt%,煅烧温度为300℃的复合催化剂Ni-MoS_2/γ-Al_2O_3表面的MoS_2纳米片兼具有良好的结晶度和均匀分散性,其纳米片尺寸约为200 nm。可见光下,Ni-MoS_2/γ-Al_2O_3(MoS_2 30wt%/Ni 5wt%)复合催化剂对罗丹明B的降解效率能达到100%,且循环使用5次后,对罗丹明B的降解效率仍能够达到88.9%。

Ni-MoS_2/γ-Al_2O_3 composite material was prepared by the combination of coprecipitation and hydrothermal method,using γ-Al_2O_3 as the carrier.The structure and morphology of the composite were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).The effects of MoS_2loading amount and calcination temperature on the light-driven photocatalystic degradation of RhB dye molecules on the Ni-MoS_2/γ-Al_2O_3 composites were investigated,and the cycling stability of the composite catalyst was also studied.The results show that MoS_2 nanosheets form on the surface of the Ni-MoS_2/γ-Al_2O_3 composite catalyst with 30wt%loading amount after calcinations at 300 ℃ are well-crystallized and uniformly dispersed,while the average size of MoS_2 nanosheets is about 200 nm.The degradation rate of the rhodamine B can reach 100%under visible light irradiation,and still remains 88.9%after recycling 5times by the Ni-MoS_2/γ-Al_2O_3(MoS_2 30wt%/Ni 5wt%).