MoS2/Bi2WO6复合催化剂的制备及其光催化性能研究

Preparation and property of MoS2/Bi2WO6 composite catalyst

通过溶剂热法制备二硫化钼/钨酸铋(MoS2/Bi2WO6)复合催化剂,考察了Mo与W摩尔比不同的复合催化剂光催化降解气相甲苯的性能,并对催化剂的结构进行了表征。结果表明:Bi2WO6纳米颗粒负载在片状的MoS2上,粒径在5~25nm范围,MoS2/Bi2WO6表现出比纯Bi2WO6更好的光催化降解率。当Mo与W摩尔比为1∶5时,MoS2/Bi2WO6光催化降解率最佳。复合催化剂降解率提高原因主要是:一方面MoS2/Bi2WO6复合催化剂的带隙较小,有助于提高可见光利用率;另一方面MoS2/Bi2WO6复合催化剂可以有效提高光生载流子迁移和分离。

MoS2/Bi2WO6 was synthesized by solvothermal method.The samples were characterized,and the effect of n(Mo)∶n(W)mole ratio on the catalyst performance was evaluated by toluene degradation.The results shown that the Bi2WO6 with diameters of 5~25nm and these nanoparticles were loaded on the sheet of MoS2.MoS2/Bi2WO6 composites exhibited higher photocatalytic degradation efficiency than pure Bi2WO6.When the mole ratio of n(Mo)∶n(W)reached 1∶5,the MoS2/Bi2WO6 exhibited the best photocatalytic degradation efficiency.The increase of efficiency was mainly caused by two reasons.On the one hand,it can be seen that the band gap of MoS2/Bi2WO6 was smaller,which improved the utilization of visible light.On the other hand,the MoS2/Bi2WO6 photocatalyst can effectively inhibit photoelectron-hole recombination,and enhanced photocatalytic activity.