Assembly of a core–shell MOF with stability into polyacrylamide hydrogel for boosting extraction of uranium from seawater  

作　　者：Yucheng Song Huanhuan Tan Shiliang Qin Zhong Liu Chuntai Liu Changyu Shen Peipei Yang Songwei Li 

机构地区：[1]National Engineering Research Center for Advanced Polymer Processing Technology,Key Laboratory of Materials Processing and Mold(Ministry of Education),Zhengzhou University,Zhengzhou 450002,China [2]Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China

出　　处：《Nano Research》2024年第4期3398-3406,共9页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2019YFA0706802);the National Natural Science Foundation of China(No.52002356 and U20A20141);China Postdoctoral Science Foundation(No.2023M731020);Project for Young Scientists in Basic Research(No.YSBR-039).

摘　　要：Efficient and selective extraction of uranium(U(VI))from seawater is essential for sustainable nuclear power production.This study reports a novel adsorbent zeolitic imidazolate framework(ZIF)-67@SiO_(2)-A/polyacrylamide(PAM)which was synthesized by grafting the core–shell metal–organic frameworks(MOFs)-based nanostructures coated with the 3-aminopropyl triethoxysilane(APTES)functionalized SiO_(2)(SiO_(2)-A)onto PAM hydrogel.The SiO_(2) shell was grown on the surface of MOF,which improved the acid-base resistance of MOF.The introduction of ZIF-67@SiO_(2)-A enhances the specific surface area and adsorption efficiency of the PAM.The ZIF-67@SiO_(2)-A/PAM shows remarkable adsorption capacity,fast adsorption kinetics,and good reusability for uranium.It has excellent adsorption property(6.33 mg·g^(-1),30 d)in natural seawater.The X-ray photoelectron spectroscopy(XPS),Fourier transform infrared(FTIR),energy dispersive spectroscopy(EDS)mappings,and density functional theory reveal that the coordination by N and O in ZIF-67@SiO_(2)-A/PAM with uranium is the main mechanism of uranium adsorption.Thus,ZIF-67@SiO_(2)-A/PAM has great potential to capture uranium from natural seawater.

关 键 词：HYDROGEL metal–organic frameworks core–shelled nanostructures uranium extraction from seawater 

分 类 号：O64[理学—物理化学]