Nitrogen-rich carbon nitrogen polymers for enhancing the sorption of uranyl  

作　　者：Zeru Wang Wenhao Li Linzhen Wu Zhuang Wang Yalan Cao Jingkai Cheng Guangyuan Chen Qian Zhao Mei Jiang Zhengguo Chen Lin Zhu Tao Duan 

机构地区：[1]National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety,Southwest University of Science and Technology,Mianyang 621010,China [2]State Key Laboratory of Environment-friendly Energy Materials,School of National Defence Science and Technology,Southwest University of Science and Technology,Mianyang 621010,China [3]College of Chemistry,Sichuan University,Chengdu 610064,China [4]School of Physics and Astronomy,China West Normal University,Nanchong 637002,China [5]NHC Key Laboratory of Nuclear Technology Medical Transformation,Mianyang Central Hospital,Mianyang 621010,China

出　　处：《Chinese Chemical Letters》2022年第7期3468-3473,共6页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.U2167221,21976148,21906133,21902129);the Basic Scientific Research Project of China(No.JCKY2018404C008);the National key research and development Project of China(No.2016YFC1402500);the Project of State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology(No.18ZXHK04);the Long Shan Talent Project(Nos.18LZX304,18LZXT04)。

摘　　要：Nitrogen enrichment and increased nitrogen content is an effective strategy for enhancing adsorption of uranium by carbon nitride polymers.Herein,we reported the uranium absorption by using a structurally well-defined and nitrogen-rich carbon nitride polymer with C_(3)N_(5) stoichiometry for the first time.In comparison with the adsorption performance of g-C_(3)N_(4) for U(Ⅵ),the conjugation system of the material was increased by connecting the heptazine unit through the azo bridge in the structure of C_(3)N_(5),so that C_(3)N_(5) exhibited several times higher adsorption performance than that of g-C_(3)N_(4).The C_(3)N_(5) has high kinetics for uranyl ions,which can adsorb100 mg/g U(Ⅵ)in only 10 min and reach complete adsorption equilibrium in 60 min;the theoretical maximum adsorption capacity is 207 mg/g,meanwhile,the material exhibits high selectivity.The results of spectral analysis and theoretical calculations indicate that the process of uranyl ion capture by C3N5is a combination of physical and chemical adsorption,and its higher density of electronic states makes the electrostatic binding ability enhanced,which is favorable to the adsorption of uranyl ions by C_(3)N_(5).This work indicates that C_(3)N_(5) has great promise and application in the separation and enrichment of uranyl ions,and also provides a reference for the systematic investigation of the adsorption ability of nitrogenrich carbon nitrogen polymers on uranyl ions.

关 键 词：URANIUM Nitrogen enrichment Carbon nitride C_(3)N_(5) Adsorption 

分 类 号：X771[环境科学与工程—环境工程] TQ424[化学工程]