过氧化氢
过氧化物酶
化学
蒙脱石
钴
催化作用
显色的
检出限
无机化学
核化学
有机化学
酶
色谱法
作者
Kaili Wu,Weikang Li,Shuang Zhao,Wei Chen,Xixi Zhu,Guangwen Cui,Zhenxue Liu,Qingyun Liu,Xianxi Zhang,Xiaoxin Zhang
标识
DOI:10.1016/j.colsurfa.2020.125063
摘要
Series of Co-doped CuS-Montmorillonite (Co/CuS-MMT) nanocomposites with different mole ratio of Co2+ to Cu2+ have been prepared via a simple hydrothermal route. Co/CuS-MMT has been firstly demonstrated to possess an intrinsic peroxidase-like activity with the aid of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB). The colorless TMB is rapidly oxidized into blue oxTMB by H2O2 only in 3 min, which is obviously distinguished by the naked eye. Among series of Co/CuS-MMT, 50Co/CuS-MMT (Co2+ doping is set to 50 atomic percentage (at%)) exhibited the highest peroxidase-like activity, in accordance with the typical Michaelis-Menten kinetics. The catalytic activity of Co/CuS-MMT is dependent on temperature, pH and the amount of Co2+, respectively. The excellent peroxidase-like performance is attributed to the OH generated in the process of catalytic reaction. Based on the peroxidase-like activity of 50Co/CuS-MMT, a fast colorimetric H2O2 sensing platform was constructed in a linear response range (10–100 μM) with a relative low detection limit (2.2 μM). This fast sensitive colorimetric sensor is conveniently applied to detect H2O2 residue in contact lens solution.
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