吸附
选择性
X射线光电子能谱
吸附
水溶液中的金属离子
化学
朗缪尔
化学吸附
朗缪尔吸附模型
单层
螯合作用
金属
核化学
无机化学
有机化学
化学工程
催化作用
生物化学
工程类
作者
Yu Li,Tu Lan,Guoyuan Yuan,Chongxiong Duan,Xiaoqin Pu,Ning Liu
出处
期刊:Polymers
[MDPI AG]
日期:2023-04-30
卷期号:15 (9): 2150-2150
被引量:7
标识
DOI:10.3390/polym15092150
摘要
In this work, a novel metal-organic frameworks (MOFs)-based ion-imprinted polymer (MIIP) was prepared to remove Co(II) from simulated radioactive wastewater. The batch experiments indicated that the sorption was well described by the pseudo-second-order kinetic and Langmuir models, and it is monolayer chemisorption. The theoretical maximum sorption capacity was estimated to be 181.5 mg∙g-1, which is by far the reported maximum value of Co(II) sorption by the imprinted materials. The MIIP presented an excellent selectivity for Co(II) in the presence of common monovalent and divalent metal ions, and the selectivity coefficients were 44.31, 33.19, 10.84, 27.71, 9.45, 16.25, and 7.60 to Li(I), K(I), Mg(II), Ca(II), Mn(II), Ba(II), and Cd(II), respectively. The sorption mechanism was explored by X-ray photoelectron spectroscopy (XPS) technology and density functional theory (DFT) calculations, suggesting that Co(II) was adsorbed by the MIIP via the chelation of 4-vinylpyridine (VP) ligands with Co(II), which was a spontaneous process, and the optimal coordination ratio of VP to Co(II) was 6. This work suggested that the MIIP has a high sorption capacity and excellent selectivity for Co(II), which is of great significance for the selective separation of Co-60 from radioactive wastewater.
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