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偕胺肟功能化β-环糊精接枝（马来酸酐-丙烯腈）共聚物的制备及铀吸附与再生性能评价

Preparation of Amidoxime-Functionalized β-Cyclodextrin-Graft-(Maleic Anhydride-co-Acrylonitrule) Copolymer and Evaluation of the Adsorption and Regeneration Properties of Uranium.

作者信息

Yang Liu, Bi Lei, Lei Zhiwei, Miao Yu, Li Bolin, Liu Tonghuan, Wu Wangsuo

机构信息

Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.

出版信息

Polymers (Basel). 2018 Feb 27;10(3):236. doi: 10.3390/polym10030236.

DOI:10.3390/polym10030236
PMID:30966271
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6414990/
Abstract

The β-cyclodextrin-graft-(maleic anhydride--acrylonitrule) copolymer (β-CD-g-(MAH--AN)) synthesized through radical polymerization reactions of β-cyclodextrin (β-CD) with maleic anhydride (MAH) and acrylonitrule (AN) in the special monomer proportion, chemically modify with amidoxime groups to obtained the new adsorbent, which was terms as amidoxime-functionalized β-cyclodextrin-graft-(maleic anhydride--acrylonitrule) copolymer (β-CD-g-(MAH--AO)). Based on the characteristic results of Fourier transform infrared spectra (FTIR), scanning electron microscopy (SEM), X-ray Diffraction (XRD), and thermalgravity analysis (TGA) techniques, the grafted nitrile groups were successfully converted to amidoxime groups by reaction with hydroxylamine. In this report, the influence of different factors such as pH value and ionic strength, solid-liquid ratio, contact time, initial U(VI) concentration, and temperature on adsorption was investigated by a batch adsorption experiment. The adsorption process fitting results show that the adsorption followed the Langmuir isotherm model and the maximum adsorption capacity was 0.747 / at pH 4.0. In addition, the regeneration performance was investigated by varying the concentration of eluent, temperature, and contact time. Under the desorption condition of 0.10 M HNO₃, the adsorbents can be reused 12 times in the case that the adsorption capacity was not significantly reduced. The functionalized copolymer exhibits high selectivity under circumstance of other co-existing ions is present in the solution.

摘要

通过β-环糊精（β-CD）与马来酸酐（MAH）和丙烯腈（AN）按特定单体比例进行自由基聚合反应合成的β-环糊精接枝（马来酸酐-丙烯腈）共聚物（β-CD-g-(MAH-AN)），用偕胺肟基团进行化学改性以获得新型吸附剂，该吸附剂被称为偕胺肟功能化β-环糊精接枝（马来酸酐-丙烯腈）共聚物（β-CD-g-(MAH-AO)）。基于傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X射线衍射（XRD）和热重分析（TGA）技术的特征结果，接枝的腈基通过与羟胺反应成功转化为偕胺肟基团。在本报告中，通过批量吸附实验研究了pH值、离子强度、固液比、接触时间、初始U(VI)浓度和温度等不同因素对吸附的影响。吸附过程拟合结果表明，吸附遵循朗缪尔等温线模型，在pH 4.0时最大吸附容量为0.747 / 。此外，通过改变洗脱剂浓度、温度和接触时间研究了再生性能。在0.10 M HNO₃的解吸条件下，吸附剂在吸附容量未显著降低的情况下可重复使用12次。在溶液中存在其他共存离子的情况下，功能化共聚物表现出高选择性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/533a/6414990/701b4e5cdd11/polymers-10-00236-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/533a/6414990/afea3850fd6f/polymers-10-00236-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/533a/6414990/16aa6241931f/polymers-10-00236-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/533a/6414990/9d111476b725/polymers-10-00236-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/533a/6414990/701b4e5cdd11/polymers-10-00236-g015.jpg

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