Carboxyl functional poly(ionic liquid)s confined in metal–organic frameworks with enhanced adsorption of metal ions from water

吸附 水溶液中的金属离子 聚合 离子液体 离子键合 金属 化学工程 放热过程 解吸 朗缪尔吸附模型 化学 X射线光电子能谱 材料科学 无机化学 朗缪尔 离子 复合材料 物理化学 有机化学 催化作用 聚合物 工程类
作者
Yuanchao Pei,Yaxin Zhang,Jie Ma,Yang Zhao,Zhiyong Li,Jianji Wang,Jianji Wang,Ran Du
出处
期刊:Separation and Purification Technology [Elsevier]
卷期号:299: 121790-121790 被引量:20
标识
DOI:10.1016/j.seppur.2022.121790
摘要

Development of porous adsorption materials tethered with functional groups was favorable to establish a more efficient, stable and broad-spectrum metal ions removal strategy from water. In this work, carboxyl functional poly(ionic liquid)[email protected] composites were prepared through in situ polymerization of ILs monomers inside MOF pores. Their thermophysical property, structure and morphology were characterized by different techniques. These [email protected] composites were proposed as universal and efficient adsorbents to remove selected rare earth metal ions (La3+, Sm3+, Nd3+) and heavy metal ions (Pb2+, Cd2+) from water medium. Effect of pH value and composite dosage on the adsorption efficiency were studied in detail. The optimized adsorption efficiency as high as 99.8 % could be found for the selected metal ions by [email protected] In addition, the isotherms, kinetics and thermodynamic parameters of the adsorption process were also determined, and these results imply that the Langmuir model and pseudo-second-order model fitted well with the experimental data. Thermodynamic parameters revealed spontaneous and exothermic nature of the adsorption process. A plausible mechanism for the adsorption process was suggested by the electrostatic interaction and coordination between the carboxyl group and metal ions with the aid of FTIR and XPS measurements. Finally, recycling experiments were performed to demonstrate the recyclability and stability of [email protected] composites undergoes at least five adsorption–desorption runs. The current research presented a series of poly(ionic liquid)[email protected] composites as a universal adsorption platform that demonstrated great potential for removing metal ions with remarkable efficiency.
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