Selective Capture of Germanium from Water by a Hydrotalcite-Based Ion-Imprinted Polymer: Performance and Mechanism

水滑石 吸附 材料科学 聚合 离子交换 无机化学 选择性 化学 聚合物 离子 物理化学 有机化学 催化作用 冶金 复合材料
作者
Hanjun Wu,Jing Wang,Zhenyue Zhang,Wenda Guo,Wendou Chen,Guoqing Feng,Junxia Yu,Ruan Chi,Zhi‐Quan Pan
出处
期刊:ACS applied polymer materials [American Chemical Society]
卷期号:6 (17): 10368-10379
标识
DOI:10.1021/acsapm.4c01489
摘要

In this work, a germanium ion-imprinted polymer (Ge-IIP) based on α-bromobutyric intercalation-modified hydrotalcite was synthesized by atom transfer radical polymerization and applied for the capture of germanium ions from wastewater. In particular, layered hydrotalcite as a skeleton support induced in situ polymerization of Ge-IIPs to form graded pores, and an α-bromobutyric interlayer was also used as an initiator to induce graft polymerization of functional monomers of 3-dihydroxypropyl-2-acrylate to form strong coordination cavities for germanium ions. Batch experiment results showed that Ge-IIPs could effectively capture germanium at a pH value of 3, and the maximum adsorption capacity was up to 55.18 mg·g–1. The adsorption kinetics and isotherms indicated that the capture of germanium was consistent with a pseudo-second-order kinetic model and a Freundlich isotherm model. The distribution coefficient values of Ge(IV) adsorption by Ge-IIPs in a coexisting metal ion solution were as high as 25 231.36 mL·g–1, indicating significant capture selectivity. In addition, Ge-IIPs showed good reusability, and the uptake rate of germanium could still reach 98.45% after 5 cycles. Furthermore, density functional theory calculation indicated that the efficient selective capture of germanium by Ge-IIPs may be attributed to the ion exchange and surface complexation between germanium ions and the abundance of o-hydroxyl groups in the Ge-IIP structure. The excellent salt tolerance and adsorption selectivity of Ge-IIPs provide the possibility for its practical application in germanium recovery from wastewater.
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