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）
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摘要
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。
The purpose of this study is to explore the adsorption performance of meso-2, 3-dimercaptosuccinic acid(DMSA) modified Fe_3O_4@SiO_2 magnetic nanocomposite(Fe_3O_4@SiO_2@DMSA) for Pb~(2+) ions removal from aqueous solutions. The effects of solution p H, initial concentration of Pb~(2+)ions, contact time, and temperature on the amount of Pb~(2+) adsorbed were investigated. Adsorption isotherms, adsorption kinetics, and thermodynamic analysis were also studied. The results showed that the maximum adsorption capacity of the Fe_3O_4@SiO_2@DMSA composite is 50.5 mg/g at 298 K, which is higher than that of Fe_3O_4 and Fe_3O_4@SiO_2 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.
The purpose of this study is to explore the adsorption performance of meso-2, 3-dimercaptosuccinic acid(DMSA) modified Fe_3O_4@SiO_2 magnetic nanocomposite(Fe_3O_4@SiO_2@DMSA) for Pb~(2+) ions removal from aqueous solutions. The effects of solution p H, initial concentration of Pb~(2+)ions, contact time, and temperature on the amount of Pb~(2+) adsorbed were investigated. Adsorption isotherms, adsorption kinetics, and thermodynamic analysis were also studied. The results showed that the maximum adsorption capacity of the Fe_3O_4@SiO_2@DMSA composite is 50.5 mg/g at 298 K, which is higher than that of Fe_3O_4 and Fe_3O_4@SiO_2 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.
引文
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[30]GUO Xue-yi,MAO Fang-fang,WANG Wei-jia,YANG Ying,BAI Zhi-ming.Sulfhydryl-modified Fe3O4@Si O2 core/shell nanocomposite:Synthesis and toxicity assessment in vitro[J].ACS Applied Materials&Interfaces,2015,7:14983-14991.DOI:10.1021/acsami.5b03873.
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