A novel 3D sp2 carbon-linked covalent organic framework as a platform for efficient electro-extraction of uranium  

作　　者：Cheng-Rong Zhang Jia-Xin Qi Wei-Rong Cui Xiao-Juan Chen Xin Liu Shun-Mo Yi Cheng-Peng Niu Ru-Ping Liang Jian-Ding Qiu 

机构地区：[1]State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang,330013,China [2]College of Chemistry,Nanchang University,Nanchang,330031,China

出　　处：《Science China Chemistry》2023年第2期562-569,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(22036003,21976077);the Natural Science Foundation of Jiangxi Province(20212ACB203009,20212ACB-203011)。

摘　　要：Extracting uranium from seawater offers opportunities for sustainable nuclear fuel supply,but the task is quite challenging due to the low uranium concentration(~3 ppb)in seawater.Here,based on the Knoevenagel condensation reaction of aldehyde and acetonitrile groups,a novel stable sp^(2)carbon-linked three-dimensional covalent organic framework(3D COF),TFPM-PDANAO was prepared as a porous platform for uranium extraction from seawater.The TFPM-PDAN-AO designed with regular 3D pore channel of 7.12 A provides a specific channel for uranyl diffusion,which exhibits high selectivity and fast kinetics for uranium adsorption.Meanwhile,the superior stability and optoelectronic properties enable it an excellent porous platform for uranium electroextraction.By applying alternating voltages between-5 and 0 V,uranyl ions can rapidly migrate and enrich into the porous structure of TFPM-PDAN-AO,then inducing the electrodeposition of uranium compounds to form the charge neutral species(Na_(2)O(UO_(3)H_(2)O)x)with an unprecedentedly high adsorption capacity of 4,685 mg g^(-1).This work not only expands the application prospects of functionalized 3D COFs,but also provides a technical support for the electrodeposition adsorption of uranium from seawater.

关 键 词：THREE-DIMENSION covalent organic framework URANIUM adsorption ELECTROSORPTION 

分 类 号：TL2[核科学技术—核燃料循环与材料]