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A new adsorbent of Pb(II) ions from aqueous solution synthesized by mechanochemical preparation of sulfonated expanded graphite

机译:机械化学法制备磺化膨胀石墨的水溶液中Pb(II)离子的新型吸附剂

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In this study, sulfonated expanded graphite (SEG) was prepared through a mechanochemical method between EG, N,N-dimethylformamide, and a sulphur trioxide pyridine complex. XRD, XPS, FT-IR, BET, SEM-EDS, and zeta potentials were used to assess the characterizations of SEG. Thereafter, the effects of pH, adsorbent dosage, initial concentration, temperature, and contact time on adsorption performances were investigated. Results demonstrated that SEG shows superior adsorption properties to remove Pb(II) with high efficiency, and the removal capacity reached 325.12?mg g?1. The Langmuir model fit the equilibrium data better than either the Freundlich model or the Temkin model. Based on kinetic experiments, the adsorption of Pb(II) with SEG was perfectly described by a pseudo-second order kinetics model. According to thermodynamic parameters, the adsorption process was endothermic and spontaneous. Adsorption–desorption results showed a superior regeneration and cyclic performance of SEG as well. In addition, results of the adsorption mechanism indicated that the sulfonated functional groups played a significant role during the adsorption process.
机译:在这项研究中,通过EG, N N -二甲基甲酰胺和三氧化硫吡啶配合物之间的机械化学方法制备了磺化膨胀石墨(SEG)。 XRD,XPS,FT-IR,BET,SEM-EDS和zeta电位用于评估SEG的特征。此后,研究了pH,吸附剂量,初始浓度,温度和接触时间对吸附性能的影响。结果表明,SEG对Pb( II )的去除效率高,吸附能力高达325.12?mg g ?1 。与Freundlich模型或Temkin模型相比,Langmuir模型对平衡数据的拟合效果更好。在动力学实验的基础上,用伪二级动力学模型完美地描述了SEG对Pb( II )的吸附。根据热力学参数,吸附过程是吸热的和自发的。吸附-解吸结果也显示了SEG优异的再生和循环性能。此外,吸附机理的结果表明,磺化官能团在吸附过程中起着重要作用。

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