Absorption performance of DMSA modified Fe_3O_4@SiO_2 core/shell magnetic nanocomposite for Pb^(2+) removal  

DMSA改性Fe_3O_4@SiO_2核壳结构磁性纳米复合材料对Pb^(2+)的吸附行为（英文）

作　　者：TIAN Qing-hua WANG Xiao-yang MAO Fang-fang GUO Xue-yi 田庆华;王晓阳;毛芳芳;郭学益

机构地区：[1]School of Metallurgy and Environment, Central South University

出　　处：《Journal of Central South University》2018年第4期709-718,共10页中南大学学报（英文版）

基　　金：Project(2013DFA51290)supported by International S&T Cooperation Program of China

摘　　要：The purpose of this study is to explore the adsorption performance of meso-2,3-dimercaptosuccinic acid(DMSA)modified Fe3O4@SiO2 magnetic nanocomposite(Fe3O4@SiO2@DMSA)for Pb2+ions removal from aqueous solutions.The effects of solution pH,initial concentration of Pb2+ions,contact time,and temperature on the amount of Pb2+adsorbed were investigated.Adsorption isotherms,adsorption kinetics,and thermodynamic analysis were also studied.The results showed that the maximum adsorption capacity of the Fe3O4@SiO2@DMSA composite is 50.5 mg/g at 298 K,which is higher than that of Fe3O4 and Fe3O4@SiO2 magnetic nanoparticles.The adsorption process agreed well with Langmuir adsorption isotherm models and pseudo second-order kinetics.The thermodynamic analysis revealed that the adsorption was spontaneous,endothermic and energetically driven in nature.本研究旨在探究2,3-二巯基丁二酸(DMSA)改性的Fe_3O_4@SiO_2核壳结构纳米复合材料(Fe_3O_4@SiO_2@DMSA)对水溶液中Pb^(2+)的去除效果。考察了溶液p H、初始Pb^(2+)浓度、吸附时间、温度对Pb^(2+)吸附量的影响。结果表明,在298 K的条件下Fe_3O_4@SiO_2@DMSA复合材料对Pb^(2+)的饱和吸附量为50.5 mg/g,明显高于Fe_3O_4和Fe_3O_4@SiO_2两种磁性纳米材料。Fe_3O_4@SiO_2@DMSA对Pb^(2+)的吸附过程符合Langmuir等温吸附模型,为准二级动力学吸附。热力学分析显示Fe_3O_4@SiO_2@DMSA对Pb^(2+)的吸附为自发的、吸热的过程。

关 键 词：lead removal ADSORPTION Fe3O4@SiO2 core/shell structure DMSA modification magnetic nanocomposite 

分 类 号：O647.3[理学—物理化学] TB33[理学—化学]