巯基功能化磁性纳米材料去除水中Ag(I)和Cd(II)  

Efficient Removal of Ag(I) and Cd(II) from Aqueous Solution by Sulfhydryl-Functionalized Magnetic Nanomaterial

作　　者：李广柱[1,2] 艾胜书 田曦[1,2] 张竹青 王勤智[1] 边德军 LI Guangzhu;AI Shengshu;TIAN Xi;ZHANG Zhuqing;WANG Qinzhi;BIAN Dejun(College of Water Conservancy and Environmental Engineering,Changchun Institute of Technology,130012 2.Jilin Provincial Key Laboratory of Municipal Wastewater Treatment,130012;3.Environmental Monitoring Center of Jilin Provincial,130011： Changchun China)

机构地区：[1]长春工程学院水利与环境工程学院,130012 [2]吉林省城市污水处理重点实验室,130012 [3]吉林省环境监测中心站,吉林长春130011

出　　处：《水处理技术》2018年第9期93-98,共6页Technology of Water Treatment

基　　金：国家科技重大专项(2014ZX07201-011);国家自然科学基金项目(51578118);吉林省科技发展计划项目(20180101029JC;20180201020SF);长春工程学院国家级大学生创新创业训练计划项目(201711927019)

摘　　要：以3-巯基丙基三甲氧基硅烷为改性剂,对Si O_2包覆Fe_3O_4纳米粒子(Fe_3O_4@Si O_2)进行改性,制备了表面巯基化磁性纳米吸附材料(Fe_3O_4@Si O_2-RSH),对其进行了表征,并研究了其对水中痕量Ag(I)和Cd(II)的吸附性能。结果表明,Fe_3O_4@Si O_2-RSH能够通过其表面巯基的螯合离子交换作用,在p H为4.0~8.0内快速、高效的吸附溶液中痕量Ag(I)和Cd(II),且受溶液中Na(I)、Ca(II)、Fe(II)等共存离子影响较小。发生在Fe_3O_4@Si O_2-RSH表面的单层吸附能够在10 min内达到平衡,Ag(I)和Cd(II)的去除率均>90%;被吸附的Ag(I)和Cd(II)能够被HNO_3溶液或L-半胱氨酸溶液洗脱并回收,回收率>83%。Fe_3O_4@Si O_2-RSH可以作为高效的吸附剂,用于污水中痕量Ag(I)和Cd(II)的深度处理和资源化回收利用。Surface sulflaydryl-functionalized magnetic nanomaterial （Fe3O4@SiO2-RSH） were prepared by modifying Fe3O4@SiO2 nanoparticles with 3- M The prepared nanomaterial was characterized, and the adsorption properties for Ag（I） and Cd（II） ions in aqueous solution were investigated. The results showed that, Fe3O4@SiO2-RSH exhibited high adsorption affinity for Ag（I） and Cd（II）, resulting from chelating interaction by surface sulthydryl group, and the adsorption was not significantly impacted by pH within the range 0f 4.0-8.0 or coexisting Na（I）, Ca（II）, Fe（II） ions. The monolayer adsorption on surface of Fe3O4@SiOz-RSH could reach equilibrium in 10 min, and the removal rates of Ag（I） and Cd（II） were all more than 90%. Moreover, the Ag（I） and Cd（II） adsorbed on Fe3O4@SiO2-RSH could be desorbed and recycled easily by HNO3 solution or L-cysteine solution. Fe304@SiO2-RSH as effective and reusable adsorbents for advanced treatment and recovery of trace Ag（I） and Cd（II） from wastewater.

关 键 词：磁性纳米材料 巯基功能化 银 镉 去除 回收 

分 类 号：X703.1[环境科学与工程—环境工程]