铁离子在多齿配体功能化硅胶上的吸附研究  

Adsorption of Ferric Ion on Multidentate Ligand Functionalized Silica Gel

作　　者：陈鹏 李蓉[1] 陈斌[1] CHEN Peng;LI Rong;CHEN Bin(School of Chemical Engineering,Northwest University,Xi′an 710069,China)

机构地区：[1]西北大学化工学院,西安710069

出　　处：《分析化学》2022年第2期300-309,共10页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.21376191);陕西省自然科学基金项目(No.2011JM2013);陕西省教育厅服务地方专项项目(No.14JF027);陕西省产业化项目(No.2013jc23)资助。

摘　　要：以自制的多齿配体功能化硅胶为吸附剂,探究了配体齿数对废水中常见重金属离子吸附的影响。研究结果表明,五齿配体亚氨基二琥珀酸-硅胶吸附剂对铁离子(Fe^(3+))的吸附能力最强,吸附量为14.4 mg/g。进一步探讨了此吸附剂对Fe^(3+)的吸附动力学和热力学行为,考察了Fe^(3+)浓度、温度、转速以及共存离子对吸附的影响,并对吸附剂的重复使用性进行了评价。结果表明,此吸附剂对Fe^(3+)的初始吸附行为相对较快,伪二阶模型可以更好地描述吸附剂的吸附动力学;Freundlich等温线模型更适合描述吸附剂的吸附热力学,吸附过程是放热的、非自发的;增大浓度和升高温度均可提高Fe^(3+)在IDS-Silica上的吸附量,而转速的提升仅能缩短达到吸附平衡的时间。除Cu 2+外,其它干扰离子对Fe^(3+)的吸附均无明显影响。IDS-Silica对Fe^(3+)的吸附具有良好的可重复性。本研究为去除废水中Fe^(3+)提供了一种新型高效的吸附材料,同时也为五齿配体亚氨基二琥珀酸螯合吸附材料的开发提供了理论参考。The self-made silica gels functionalized with various multidentate ligands were used as adsorbents to explore the effects of ligand dentate numbers on the adsorption of common heavy metal ions in wastewater.Silica gel modified with pentadentate ligand iminodisuccinic acid displayed the highest adsorption capacity of 14.4 mg/g for Fe^(3+).The adsorption kinetics and thermodynamics of this adsorbent were studied,and the influences of concentration of Fe^(3+),temperature,rotation speed and coexisting ions on the adsorption were investigated.The experiment results showed that the adsorbent had a relatively fast initial adsorption behavior for Fe^(3+),and the pseudo-second-order model could better describe the adsorption kinetics of the adsorbent.Freundlich isotherm model was more suitable for describing equilibrium data,and the adsorption process was exothermic and non-spontaneous.Increasing the concentration and temperature could improve the adsorption capacity of Fe^(3+)on IDS-Silica,while increasing speed could shorten time to reach adsorption equilibrium.Other interfering ions had no effects on adsorption of Fe^(3+)except for Cu 2+.Furthermore,IDS-Silica had good repeatability for adsorption of Fe^(3+).This work provided a new and efficient adsorption material for removing Fe^(3+)in wastewater,and also provided a theoretical reference for developing chelating adsorption material modified with pentadentate ligand iminodisuccinic acid.

关 键 词：多齿配体 铁离子 吸附动力学 吸附热力学 重复使用性 亚氨基二琥珀酸 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]