摘要
通过高温煅烧法制备了具有类氧化物酶活性的多孔CoNi双金属氮掺杂碳纳米酶(CoNi/NC)。该纳米酶可以在无H_(2)O_(2)条件下直接催化显色底物3,3′,5,5′-四甲基联苯胺(TMB)变蓝。得益于该纳米酶双金属组分与多孔结构的协同作用,其类氧化物酶催化活性优异。由动力学实验可得,其Km为(0.919±0.283) mmol/L,V_(max)为(3.850±0.707)×10^(-8) mol·L^(-1)·s^(-1),对底物表现出较强的亲和力和较大的反应速率。由自由基清除实验可得,在TMB被氧化变色过程中,·OH和·O_(2)-起关键作用。利用Mn^(2+)可以与显色产物络合使溶液体系褪色的现象,构建了比色检测Mn^(2+)含量的新方法。该方法线性范围为0.005~0.04 mmol/L,检出限低至0.001 7 mmol/L,且在实际水样中得到成功应用。为进一步提高方法的便捷性,使该纳米酶凝胶化,探究其在实际样品检测中应用的可能性,以期为比色检测方法集成化提供新思路。
Porous CoNi bimetallic nitrogen-doped carbon nanozyme(CoNi/NC)with oxidase-like activity was prepared by high-temperature calcination.This nanozyme can directly catalyze the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine(TMB)to produce a blue coloration wit-hout the need for H_(2)O_(2).The excellent peroxidase-like catalytic performance of this nanozyme is attributed to the synergistic effect of its bimetallic components and its porous structure.Kinetic studies revealed that the K m value is(0.919±0.283)mmol/L,and the V max is(3.850±0.707)×10^(-8)mol·L^(-1)·s^(-1),indicating strong substrate affinity and a high reaction rate.Free radical scavenging experiments demonstrated that·OH and·O_(2)-radicals play crucial roles in the oxidation and color change process of TMB.Leveraging the phenomenon that Mn^(2+) can complex with the chromogenic product to cause solution decolorization,we developed a novel colorimetric method for detecting Mn^(2+) content.This method exhibits a linear range of 0.005-0.04 mmol/L and a detection limit as low as 0.0017 mmol/L,and has been successfully applied to real water samples.To enhance the practicality of this method,the nanozyme was immobilized in a gel matrix,exploring its potential for detecting actual samples and providing new insights into the integration of colorimetric detection methods.
作者
公海龙
沈思宇
侯晓峰
马勤勤
王学东
刘婷婷
GONG Hailong;SHEN Siyu;HOU Xiaofeng;MA Qinqin;WANG Xuedong;LIU Tingting(Jiangsu Key Laboratory of Environmental Science and Engineering,School of Environmental Science and Engineering,Suzhou University of Science and Techno-logy,Suzhou 215009,Jiangsu,China)
出处
《材料导报》
北大核心
2026年第3期117-124,共8页
Materials Reports
基金
国家自然科学基金(22076134)
江苏省重点研发计划(BE2022733)。
