文献类型：期刊文献

中文题名：功能化的β-环糊精水凝胶对U(Ⅵ)、Th(Ⅳ)的吸附

英文题名：Contrastive Adsorptions of Uranium(Ⅵ) and Thorium(Ⅳ) by Modified β-Cyclodextrin Hydrogels

作者：毕蕾[1];杨柳[1];雷志伟[1];姜芸捷[1];刘莲[1];段国建[2];吴蓉[2];胡佩卓[1];刘同环[1]

第一作者：毕蕾

机构：[1]兰州大学核科学与技术学院,甘肃兰州730000;[2]甘肃中医药大学药学院,甘肃兰州730000

第一机构：兰州大学核科学与技术学院,甘肃兰州730000

年份：2019

卷号：41

期号：4

起止页码：349

中文期刊名：核化学与放射化学

外文期刊名：Journal of Nuclear and Radiochemistry

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金资助项目(21501082;21571088;21762001)

语种：中文

中文关键词：U(Ⅵ);Th(Ⅳ);偕胺肟基;对比吸附;拟合计算

外文关键词：U(Ⅵ);Th(Ⅳ);amidoxime group;comparative adsorptions;fitting calculation

摘要：以顺丁烯二酸酐修饰的β-环糊精(β-CD)、丙烯腈(AN)和顺丁烯二酸酐(MAH)为单体,合成了功能化三元共聚物水凝胶β-CD/MAH-co-AN-co-MAH(CD-AN-MAH),进一步肟化得到β-CD/MAH-co-AO-co-MAH(CD-AO-MAH)。为了探索两种三元共聚物水凝胶在一定条件下对U(Ⅵ)、Th(Ⅳ)的吸附特性,研究了酸度、时间和温度对吸附过程的影响,进而观察U(Ⅵ)和Th(Ⅳ)的不同的吸附行为;结合动力学拟合、吸附等温线和热力学拟合解释U(Ⅵ)和Th(Ⅳ)与两种新材料间的相互作用机理。结果表明:一定酸度条件下,两种三元共聚物水凝胶对U(Ⅵ)和Th(Ⅳ)的吸附均是快速的动力学过程,服从准二级动力学模型;肟化后的CD-AO-MAH对U(Ⅵ)的吸附效果优于肟化前的CD-AN-MAH;且两种三元共聚物水凝胶对于U(Ⅵ)的吸附均优于对Th(Ⅳ)的吸附。再一次证明肟基对U(Ⅵ)有较好的选择性,肟化后的三元共聚物水凝胶可以做为选择性分离U(Ⅵ)的潜在材料。
In this paper, maleic anhydride, acrylonitrile and β-cyclodextrin modified by maleic anhydride were used as monomers. Terpolymer hydrogel β-cyclodextrin/maleic -anhydride-co-acrylonitrile-co-maleic anhydride(CD-AN-MAH) were synthesized, which was further oximated to get the amidoxime product(CD-AO-MAH). In order to explore the adsorption characteristics of both U(Ⅵ) and Th(Ⅳ) in appropriate conditions, several groups of adsorption experiments as the effects of pH, time and temperature were studied to learn the different adsorption behaviors of U(Ⅵ) and Th(Ⅳ). And the mechanism of the adsorptions were explored by the kinetics, isotherms and thermodynamics. It is found that the processes of U(Ⅵ) and Th(Ⅳ) adsorbed onto CD-AN-MAH and CD-AO-MAH are all fast adsorption kinetics conforming to the pseudo-second-order model. The adsorption effect of CD-AO-MAH for U(Ⅵ) is better than CD-AN-MAH under the same conditions. While for Th(Ⅳ) the adsorption effects of both CD-AN-MAH and CD-AO-MAH are not as good as U(Ⅵ). The results indicate that the amidoxime group has a promising selectivity for U(Ⅵ). The terpolymer hydrogel modified by amidoxime group can be used as a potential material for selective separation of U(Ⅵ) in solution system in the future.