MoS_(2)/ZnIn_(2)S_(4)的制备及光催化降解含油污水  

Preparation of MoS_(2)/ZnIn_(2)S_(4) and photocatalytic degradation of oily wastewater

作　　者：夏德国 杜英莲 XIA Deguo;DU Yinglian(Environmental Monitoring Center of Junan County Linyi City,Linyi 276600,China)

机构地区：[1]临沂市莒南县环境监控中心,山东临沂276600

出　　处：《工业用水与废水》2022年第5期51-56,共6页Industrial Water & Wastewater

基　　金：国家重点研发计划项目(2018YFC1801901)。

摘　　要：在水热法合成ZnIn_(2)S_(4)的基础上,通过低温等离子体技术将MoS_(2)负载到ZnIn_(2)S_(4)表面,制备了一系列不同MoS_(2)含量的MoS_(2)/ZnIn_(2)S_(4)复合光催化剂,采用XRD、SEM/TEM、XPS和BET等分析手段对MoS_(2)/ZnIn_(2)S_(4)复合光催化剂的结构进行了表征。结果表明,利用低温等离子体技术可以将二维的MoS_(2)直接负载到二维的ZnIn_(2)S_(4)表面,形成2D-2D复合结构,不仅可以增大比表面积,还可以有效抑制光生载流子的复合几率。研究了MoS_(2)的负载量、不同的激发光源以及光催化剂的用量对光催化降解含油污水性能的影响。结果表明,MoS_(2)的负载可以显著增强ZnIn_(2)S_(4)的光催化活性。其中,5%MoS_(2)/ZnIn_(2)S_(4)经18.4 W可见光照射80 min后,在pH值为11,含油污水初始COD的质量浓度为120 mg/L的条件下,对COD去除率达到92%,其表观一级反应速率常数达到0.0334 min^(-1),是单一ZnIn_(2)S_(4)的5.2倍。Based on the hydrothermal synthesis of ZnIn_(2)S_(4),a series of MoS_(2)/ZnIn_(2)S_(4) composite photocatalysts with different MoS_(2) contents were prepared by loading MoS_(2) on the surface of ZnIn_(2)S_(4) through low-temperature plasma technology.The structure of MoS_(2)/ZnIn_(2)S_(4) composite photocatalyst was characterized by XRD,SEM/TEM,XPS and BET techniques.The results showed that,two-dimensional MoS_(2) could be directly loaded on the surface of two-dimensional ZnIn_(2)S_(4) by low-temperaure plasma to form a 2D-2D composite structure,which not only increase the specific surface area,but also effectively inhibit the recombination of photon-generated carrier.The effect of MoS_(2) loading amount,different excitation light source and photocatalyst dosage on photocatalytic degradation of oily wastewater were studied.The results showed that,the loading of MoS_(2) could significantly enhance the photocatalytic activity of ZnIn_(2)S_(4).Among all MoS_(2)/ZnIn_(2)S_(4) composites,5%MoS_(2)/ZnIn_(2)S_(4) could degrade 92%of COD in wastewater with initial concentration of 120 mg/L after 80 min of visible light irradiation(18.4 W)at pH value of 11,and its apparent first-order reaction rate constant reached 0.0334 min^(-1),which was 5.2 times that of single ZnIn_(2)S_(4).

关 键 词：光催化 MoS_(2)/ZnIn_(2)S_(4) 含油污水 COD 低温等离子体技术 

分 类 号：X703.1[环境科学与工程—环境工程] O613.51[理学—无机化学]