MoS_(2)/尼龙复合纳滤膜对水中铅离子的去除机理研究  

Mechanism of Pb^(2+)Removal from aqueous solution by MoS_(2)/nylon composite nanofiltration membranes

作　　者：胡传智 吴红丹[1] 周志辉[1] 张健 Hu Chuanzhi;Wu Hongdan;Zhou Zhihui;Zhang Jian(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《武汉科技大学学报》2023年第5期354-360,共7页Journal of Wuhan University of Science and Technology

基　　金：湖北省教育厅科学研究计划指导性项目(B2020019).

摘　　要：以尼龙微孔滤膜为载体,采用真空辅助自组装法制得MoS_(2)/尼龙复合纳滤膜,借助XRD、SEM、EDS、XPS等研究了其对水中铅离子(Pb^(2+))的去除能力。结果表明,与干膜相比,MoS_(2)/尼龙纳滤湿膜具有更高的水通量和更好的Pb^(2+)去除性能。当MoS 2纳米片负载量为64 mg、Pb^(2+)浓度低于5 mg/L时,湿膜对Pb^(2+)的去除率可达99.8%,通量稳定在230 L·m^(-2)·h^(-1)·bar^(-1)左右。在Pb^(2+)去除过程中,Pb^(2+)与MoS 2纳米片表面的H+发生了离子交换反应,同时与纳米片中的S原子形成了Pb-S键。经5个循环再生周期,MoS_(2)复合纳滤膜对Pb^(2+)仍具有较强的吸附能力,表现出良好的再生性能。MoS_(2)/nylon composite nanofiltration membranes were prepared via vacuum-assisted self-assembly(VASA)method with nylon microporous membrane as the carrier,and the effects of Pb^(2+)removal from the aqueous solution by the as-prepared composite membranes were investigated by means of XRD,SEM,EDS and XPS.The results show that wet MoS_(2)/nylon nanofiltration membranes have higher water flux and better Pb^(2+)removal performance than that of dry membranes.When the MoS_(2)nanosheet loading is 64 mg and the concentration of Pb^(2+)is less than 5 mg/L,the removal rate of Pb^(2+)by wet membranes can reach 99.8%,and the flux is stable at about 230 L·m^(-2)·h^(-1)·bar^(-1).During Pb^(2+)removal,Pb^(2+)undergoes ion exchange reaction with H+on the surface of the MoS_(2)nanosheet,and at the same time forms a Pb—S bond with the S atom in the nanosheet.After 5 cycles of regeneration,MoS_(2)composite nanofiltration membranes still have strong adsorption capacity for Pb^(2+)and show good regeneration performance.

关 键 词：MoS_(2) 尼龙 复合纳滤膜 Pb^(2+) 去除机理 

分 类 号：X703.1[环境科学与工程—环境工程]