Functional decoration on a regenerable bifunctional porous covalent organic framework probe for rapid detection and adsorption of copper ions  

作　　者：Yu-Long Li Xi-Lang Jin Yi-Ting Ma Jing-Rui Liu Fazal Raziq Peng-Yuan Zhu Zhi-Feng Deng Hong-Wei Zhou Wei-Xing Chen Wen-Huan Huang 

机构地区：[1]School of Materials and Chemical Engineering,Xi’an Technological University,Xi’an,710021,China [2]Yulin Boyi-Jingking Research Institute of Industrial Technology Development Research,Yulin,719054,China [3]KAUST Catalysis Center,King Abdullah University of Science and Technology,23955-6900,Thuwal,Kingdom of Saudi Arabia [4]Key Laboratory of Chemical Additives for China National Light Industry,College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi’an,710021,China [5]National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology,School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong,723001,China

出　　处：《Rare Metals》2024年第2期758-769,共12页稀有金属（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(Nos.22001156 and 22271178);the Innovation Capability Support Program of Shaanxi(No.2022KJXX-88);the Technology Innovation Leading Program of Shaanxi(No.2020QFY07-05).

摘　　要：Developing fluorescence porous probe for detecting and eliminating Cu^(2+) contamination in water or biosystem is an essential research project that has attracted considerable attention.However,improving the fluorescence detecting efficiency while enhancing the adsorption capacity of the porous probe is of great challenge.Herein,a bifunctional two-dimensional imine-based porous covalent organic framework(TTP-COF)probe was designed and synthesized from 1,3,5-tris(4-aminophenyl)benzene(TAPB)and 2,4,6-Triformylphloroglucinol(TP)ligand.TTP-COF displayed rapid detection of Cu^(2+)(limit of detection(LOD)=10 nmol·L^(−1) while achieving a high adsorption capacity of 214 mg·g^(−1)(pH=6)at room temperature with high reusability(>5 cycles).The key roles and contributions of highπ-conjugate and delocalized electrons in TABP and functional–OH groups in TP were proved.More importantly,the fluorescence quenching mechanism of TTP-COF was studied by density functional theory theoretical calculations,revealing the crucial role of intramolecular hydrogen bonds among C=N and–OH groups and the blocking of the excited state intramolecular proton transfer process in detecting process of Cu^(2+).

关 键 词：Covalent organic framework(COF) Excited-state intramolecular proton transfer(ESIPT) Copper ion detection Copper ion adsorption Renewability 

分 类 号：O657.3[理学—分析化学]