Predesigned covalent organic framework with sulfur coordination: Anchoring Au nanoparticles for sensitive colorimetric detection of Hg(Ⅱ)  

作　　者：Guorong Li Yijing Wu Chao Zhong Yixin Yang Zian Lin 

机构地区：[1]Ministry of Education Key Laboratory of Analytical Science for Food Safety and Biology,Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety,College of Chemistry,Fuzhou University,Fuzhou 350108,China

出　　处：《Chinese Chemical Letters》2024年第5期392-396,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22274021,21974021 and 22036001).

摘　　要：Targeted construction of new covalent organic frameworks(COFs)with specific purposes and rationalities to build colorimetric assay platform for environmental pollutant monitoring have attracted increasing interest.However,it is still challenging due to lack of available coordination sites inside COFs pores and only a slight bonding ability for anchoring metal.In this work,a two-dimensional(2D)COFs(termed as Tz-COF)with high crystallinity,excellent chemical stability,and abundant sulfur coordination in its skeletons was synthesized and used for the confined growth of Au NPs.It was found that the Au NPs showed significant dispersibility for the support of Tz-COF.The proposed Tz-COF@Au NPs possessed outstanding Hg^(2+)-activated peroxidase-like activity benefited from physicochemical properties of gold amalgam and synergistic effect between COFs and Au NPs to oxidize chromogenic substrate.Based on highly efficient activity and distinctive color evolution,the strategy for detecting Hg^(2+)was developed and successfully applied to determine the content of Hg^(2+)in real environmental samples.This work manifests that a potential strategy to establish a colorimetric assay platform for environmental pollutant monitoring based on the targeted manufacturing of novel COFs with specific functions.

关 键 词：Covalent organic frameworks THIAZOLE Sulfur coordination Au nanoparticles Hg^(2+)-activated peroxidase-like activity 

分 类 号：O657.3[理学—分析化学] X830[理学—化学]