Abstract
Developing fluorescence porous probe for detecting and eliminating Cu2+contamination in water or biosystem is an essential research project that has attracted considerable attention.However,improving the fluores-cence 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 Cu2+(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 high π-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 Cu2+.
基金项目
国家自然科学基金(22001156)
国家自然科学基金(22271178)
Innovation Capability Support Program of Shaanxi(2022KJXX-88)
Technology Innovation Leading Program of Shaanxi(2020QFY07-05)
NETL
NSTL
万方数据