Efficient gaseous iodine capture enhanced by charge-induced effect of covalent organic frameworks with dense tertiary-amine nodes  

作　　者：Bo Jiang Yue Qi Xiaofeng Li Xinghua Guo Zhimin Jia Jie Zhang Yang Li Lijian Ma 

机构地区：[1]College of Chemistry,Sichuan University,Chengdu 610064,China

出　　处：《Chinese Chemical Letters》2022年第7期3556-3560,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21976125);the Sichuan Science and Technology Program(Nos.2020JDRC0014 and 2021YFG0229);the support from the Fundamental Research Funds for the Central Universities;the Comprehensive Training Platform Specialized Laboratory,College of chemistry,Sichuan University。

摘　　要：Based on the outstanding application advantages of nitrogen-rich materials with regular porous frameworks in the capture of gaseous radioactive iodine,a series of covalent organic frameworks(COFs)with dual channels and abundant tertiary-amine active sites were constructed herein via a unique multinitrogen node design.The high density of up-to-six nitrogen adsorption sites in a single structural unit of the products effectively improved the adsorption capacities of the materials for iodine.Moreover,the adsorption affinity of the active sites can be further regulated by charge-induced effect of different electrondonating groups introduced into the COFs.Adsorption experiments combined with DFT theoretical calculations confirmed that the introduction of electron-donating groups can effectively increase the electron density around the active sites and enhance the binding energy between the materials and iodine,and thus improve the iodine adsorption capacity to 5.54 g/g.The construction strategy of multi-nitrogen node and charge-induced effect proposed in this study provides an important guidance for the study of the structure-activity relationship of functional materials and the design and preparation of high-performance iodine adsorption materials.

关 键 词：Covalent organic frameworks Tertiary-amine nodes Charge-induced effect Gaseous iodine capture DFT theoretical calculation 

分 类 号：TB34[一般工业技术—材料科学与工程] O647.3[理学—物理化学]