Highly efficacious entrapment of Th (IV) and U (VI) from rare earth elements in concentrated nitric acid solution using a phosphonic acid functionalized porous organic polymer adsorbent
Highly efficacious entrapment of Th (IV) and U (VI) from rare earth elements in concentrated nitric acid solution using a phosphonic acid functionalized porous organic polymer adsorbent
复制标题
使用膦酸功能化多孔有机聚合物吸附剂高效捕获浓硝酸溶液中稀土元素中的 Th (IV) 和 U (VI)
DOI：
10.1016/j.seppur.2019.116379
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发表时间：
2020
影响因子：
8.6
通讯作者：
Qinghua Zhang
中科院分区：
文献类型：
--
作者：
Dingzhong Yuan;Shiao Zhang;Jiale Tan;Yahong Dai;Yun Wang;Yan He;Yan Liu;Xiaohong Zhao;Mengmeng Zhang;Qinghua Zhang
在浓酸性溶液中从稀土元素中提取Th（IV）和U（VI）具有挑战性。本文以二乙烯基苯（DVB）和乙烯基膦酸（VPA）为原料，通过溶剂热共聚法合成了一种含膦酸基团的纳米多孔聚合物吸附剂P（DVB-VPA）。P（DVB-VPA）对Th（IV）和U（VI）的最大吸附容量（qmax）估计为354.6和216.5 mg g− 1，在298 K，4 mol L− 1的硝酸介质中，这比以前报道的大多数吸附剂大得多。在浓硝酸溶液中，P（DVB-VPA）对稀土元素中的Th（IV）和U（VI）具有良好的选择性，La（III）、Ce（III）、Eu（III）、Nd（III）和Sm（III）对Th（IV）和U（VI）的选择性分别为82.2%和72.5%。XPS分析表明，吸附机理是通过P（DVB-VPA）聚合物骨架上的P双键O配体与钍和铀的络合作用实现的。由于P（DVB-VPA）对Th（IV）的结合力大于U（VI），因此在浓硝酸介质中，P（DVB-VPA）对Th（IV）的qmax和选择性均大于对U（VI）的qmax和选择性。
It is challenging to extract Th (IV) and U (VI) from rare earth elements (REEs) in concentrated acidic solution. Herein, a nanoporous polymer adsorbent P (DVB-VPA) bearing phosphonic acid groups has been synthesized by solvothermal copolymerization of divinylbenzene (DVB) and vinylphosphonic acid (VPA). The maximum adsorption capacity (qmax) for Th (IV) and U (VI) onto P (DVB-VPA) was estimated to be 354.6 and 216.5 mg g−1at 298 K in 4 mol L−1of hydrogen nitrate media, which were much larger than most of the adsorbents reported previously. Besides, P (DVB-VPA) exhibited a good selectivity for Th (IV) and U (VI) from REEs in concentrated nitric acid solution, since the values of the selectivity for Th (IV) and U (VI) over La (III), Ce (III), Eu (III), Nd (III) and Sm (III) were 82.2% and 72.5%, respectively. XPS analysis revealed that the adsorption mechanism was achieved through the complexation of Pdouble bondO ligands anchored onto the polymer skeleton of P (DVB-VPA) with thorium and uranium. Due to P (DVB-VPA) showed a larger binding force toward Th (IV) than U (VI), both qmaxand selectivity for Th (IV) in concentrated hydrogen nitrate media was larger than those for U (VI) on P (DVB-VPA), which has been confirmed by DFT calculations.