新型au -锚定Fe-NC纳米酶快速灵敏比色检测Cr（VI）

IF 3.3 3区化学 Q2 CHEMISTRY, ANALYTICAL

Analyst Pub Date : 2025-10-02 DOI:10.1039/d5an00830a

Shumin Xi, Fengjun Luo, Peng Chen, Ding Wang, Jingxi Wang, Beibei Kou, Renyong Zhao

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引用次数: 0

摘要

六价铬（Cr(VI)）作为一种高生物毒性重金属离子，对环境安全和人体健康构成极大威胁。在此，我们报告了一种基于Au纳米颗粒锚定Fe-NC纳米酶（AuNPs/Fe-NC）催化的简单且经济高效的Cr（VI）检测比色传感平台。AuNPs/Fe-NC纳米酶具有与天然辣根过氧化物酶（HRP）相当的催化活性和动力学，可以催化3,3 ',5,5 ' -四甲基联苯胺（TMB）氧化成蓝色。在8-羟基喹啉（8-HQ）的存在下，制备的AuNPs/Fe-NC的催化活性被抑制，削弱了AuNPs/Fe-NC催化氧化TMB的能力。引入Cr（VI）后，AuNPs/Fe-NC纳米酶的这种催化活性可以恢复，导致蓝色增加。通过监测Cr（VI）的紫外-可见吸光度变化，对其进行了定量分析，显示出良好的灵敏度，检出限低至0.25 μM，线性范围为1 ~ 165 μM。该方法对一系列金属阳离子也有很高的选择性，已成功应用于自来水中Cr（VI）的检测。

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Novel Au-anchored Fe-NC nanozyme enabled rapid and sensitive colorimetric detection of Cr(VI)

Hexavalent chromium (Cr(VI)), as a high biologically toxic heavy metal ion, poses a great threat to environmental safety and human health. Herein, we report a facile and cost-effective colorimetric sensing platform for Cr(VI) detection based on Au nanoparticles-anchored Fe-NC nanozyme (AuNPs/Fe-NC) catalysis. The AuNPs/Fe-NC nanozyme shows comparable catalytic activity and kinetics to natural horseradish peroxidase (HRP), which could catalyze 3,3’,5,5’

-tetramethylbenzidine (TMB) to its oxidized form with a blue color. In the presence of 8-hydroxyquinoline (8-HQ), the catalytic activities of prepared AuNPs/Fe-NC was inhibited, which weaken AuNPs/Fe-NC-catalyzed oxidation towards TMB. After Cr(VI) was introduced, this catalytic activity of AuNPs/Fe-NC nanozyme could be recovered, resulting in an increasing blue color. By monitoring the variation of UV-vis absorbance, Cr(VI) had been quantified analysis and shown excellent sensitivity with the detection limit as low as 0.25 μM, and the linear range was 1-165 μM. It also exhibited high selectivity for a series of metal cations, and had been successfully applied to the detection of Cr(VI) in tap water.