Extremely stable amidoxime functionalized covalent organic frameworks for uranium extraction from seawater with high efficiency and selectivity  

超稳定偕胺肟功能化共价有机框架用于高效选择性海水提铀

作　　者：Gong Cheng Anrui Zhang Zhiwei Zhao Zimin Chai Baowei Hu Bing Han Yuejie Ai Xiangke Wang 程功;张安睿;赵志伟;柴子民;胡保卫;韩冰;艾玥洁;王祥科(Key Laboratory of Resources and Environmental Systems Optimization,Ministry of Education,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;The Key Laboratory of Functional Molecular Solids,Ministry of Education,Anhui Normal University,Wuhu 241000,China;School of Life Science,Shaoxing University,Shaoxing 312000,China)

机构地区：[1]Key Laboratory of Resources and Environmental Systems Optimization,Ministry of Education,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China [2]The Key Laboratory of Functional Molecular Solids,Ministry of Education,Anhui Normal University,Wuhu 241000,China [3]School of Life Science,Shaoxing University,Shaoxing 312000,China

出　　处：《Science Bulletin》2021年第19期1994-2001,M0004,共9页科学通报（英文版）

基　　金：supported by the Science Challenge Project(TZ2016004);the National Natural Key Research and Development Program of China(2018YFC1900105 and 2017YFA0207002);Beijing Outstanding Young Scientist Program。

摘　　要：Uranium extraction from seawater is of strategic significance for nuclear power generation.Amidoximebased functional adsorbents play indispensable roles in the recovery of seawater uranium with high efficiency.Nevertheless,balancing the adsorption capacity and selectivity is challenging in the presence of complicated interfering ions especially vanadium.Herein,a polyarylether-based covalent organic framework functionalized with open-chain amidoxime(COF-HHTF-AO)was synthesized with remarkable chemical stability and excellent crystallinity.Impressively,the adsorption capacity of COF-HHTF-AO towards uranium in natural seawater reached up to 5.12 mg/g,which is 1.61 times higher than that for vanadium.Detailed computational calculations revealed that the higher selectivity for uranium over vanadium originated from the specific bonding nature and coordination pattern with amidoxime.Combining enhanced adsorption capacity,excellent selectivity and ultrahigh stability,COF-HHTF-AO serves as a promising adsorbent for uranium extraction from the natural seawater.海水提铀对于核能生产具有战略性意义.偕胺肟基功能性吸附剂在海水铀提取中发挥着不可或缺的作用.然而,面对海水复杂的离子环境,尤其在钒离子的存在下,同时获得高吸附性能和高选择性是一个巨大挑战.本文制备了基于聚芳醚的开环偕胺肟功能化共价有机框架(COF-HHTF-AO),COF-HHTF-AO表现出高结晶度和优异的化学稳定性.COF-HHTF-AO在真实海水中对铀的提取量高达5.12 mg/g,是钒的1.61倍.理论计算研究发现,铀相比于钒的高选择性归因于其与偕胺肟的结合方式和配位形态.COFHHTF-AO具有高吸附容量、优异的选择性和超高稳定性,是一种具有广泛前景的海水提铀吸附剂.

关 键 词：AMIDOXIME Covalent organic frameworks EXTRACTION URANIUM High selectivity 

分 类 号：G63[文化科学—教育学]