Mechanism of TMB Discoloration Catalyzed by Layered CoNi@CN Nanozymes:Application Based on Smart Phone for Resorcinol Detection  

作　　者：Qingyong Guo Rongsheng Xiao Haifeng Chen Meishuo Bao Jingwen Qi Qian-qian Jia Wuxiang Zhang 

机构地区：[1]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu,212003 China

出　　处：《Chinese Journal of Chemistry》2025年第3期281-291,共11页中国化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22306076);the Natural Science Foundation of Jiangsu Province(BK20230676);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.22KJB610011).

摘　　要：Real-time on-site monitoring of resorcinol(RS)concentrations is crucial for detecting hazardous levels,enabling prompt response measures to mitigate potential environmental and health risks.In this study,we developed an innovative method using CoNi@CN-2 nanozymes to activate peroxymonosulfate(PMS)for oxidizing 3,3',5,5'-tetramethylbenzidine(TMB).Our results show that the formation of Ni^(2+)through the oxidation of Ni^(0)on the CoNi@CN-2 surface significantly enhances the electron-donating capacity of Co^(0).The catalytic reaction of TMB is mediated by redox active species(SO_(4)^(•-),•O_(2)^(-),•OH and^(1)O_(2)).RS drives colorimetry by transferring electrons to the benzene ring and specific nitrogen atoms in ox-TMB,reducing ox-TMB to TMB.Furthermore,the colorimetric assay shows a robust linear correlation between RS concentration and absorbance(Abs),described by Abs=-0.44[RS]+0.886(0—200μmol/L,R^(2)=0.983).Also,we introduce a novel smartphone-integrated autonomous detection software that can analyze RS concentration and grayscale values(GSV),yielding GSV=0.327[RS]+63.601(0—200μmol/L,R^(2)=0.990)with a detection limit of 5.29μmol/L.Additionally,excess PMS leads to ROS attacking specific sites in ox-TMB,forming secondary oxidation products.This study has enabled rapid and accurate detection of RS,making a significant contribution to environmental safety and protection.

关 键 词：RESORCINOL Colorimetric reaction Nanozymes TMB SMARTPHONE 

分 类 号：O62[理学—有机化学]