The Key Laboratory of Functional Molecular Solids, Ministry of Education;Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of ChemoBiosensing, Anhui Key Laboratory of Functional Molecular Solids, China.
College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, P.R. China.
Analyst. 2022 May 30;147(11):2388-2395. doi: 10.1039/d2an00560c.
The development of an efficient protocol to achieve the precise monitoring of trace Hg is of great significance. In this work, a colorimetric sensing platform for Hg monitoring was constructed modifying gold nanoparticles (Au NPs) and hemin/reduced graphene oxide (H-rGO) onto carbon cloth (CC) (AuNPs/H-rGO/CC). The Au NPs, anchored on the surface of the interlaced fibers of CC without aggregation, showed high peroxidase-mimetic catalytic activity. The formed Au amalgam and the synergistic effect of Au NPs and H-rGO enhanced the peroxidase-mimetic activity of AuNPs/H-rGO/CC and enabled the sensing platform to achieve the colorimetric detection of Hg over a wide range of 3.2 × 10 M-1.0 × 10 M. AuNPs/H-rGO/CC exhibited high selectivity towards Hg due to the high special affinity between Au NPs and Hg. The sensing platform was further successfully applied to the determination of Hg in different water samples a simplified operation involving just tweezers. The present sensing protocol is expected to provide an efficient way to construct colorimetric sensors and to promote the sensitive determination of Hg for a variety of relevant applications.
开发一种有效的方法来精确监测痕量汞具有重要意义。在这项工作中，通过修饰金纳米粒子（Au NPs）和血红素/还原氧化石墨烯（H-rGO）在碳布（CC）上（AuNPs/H-rGO/CC）构建了用于 Hg 监测的比色传感平台。Au NPs 锚定在 CC 的交错纤维表面上，没有聚集，表现出高过氧化物酶模拟催化活性。形成的 Au 汞齐以及 Au NPs 和 H-rGO 的协同作用增强了 AuNPs/H-rGO/CC 的过氧化物酶模拟活性，使传感平台能够在 3.2×10-5 M-1.0×10-4 M 的宽范围内实现对 Hg 的比色检测。由于 Au NPs 和 Hg 之间的高特殊亲和力，AuNPs/H-rGO/CC 对 Hg 表现出高选择性。传感平台进一步成功应用于不同水样中 Hg 的测定，操作简单，只需用镊子夹取即可。本传感方案有望为构建比色传感器提供一种有效的方法，并促进对各种相关应用中 Hg 的灵敏测定。
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