LAUSR

The purpose of this study is to explore the adsorption performance of meso-2, 3-dimercaptosuccinic acid (DMSA) modified Fe3O4@SiO2 magnetic nanocomposite (Fe3O4@SiO2DMSA) 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@SiO2DMSA 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.摘要本研究旨在探究2,3-二巯基丁二酸(DMSA)改性的Fe3O4@SiO2 核壳结构纳米复合材料 (Fe3O4@SiO2@DMSA)对水溶液中Pb2+的去除效果。考察了溶液pH、初始Pb2+浓度、吸附时间、 温度对Pb2+吸附量的影响。结果表明,在298 K 的条件下Fe3O4@SiO2@DMSA 复合材料对Pb2+的饱 和吸附量为50.5 mg/g,明显高于Fe3O4 和Fe3O4@SiO2 两种磁性纳米材料。 Fe3O4@SiO2@DMSA 对 Pb2+ 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 Fe3O4@SiO2@DMSA 对Pb2+的吸附为自发的、吸热的过程。