Detecting of sulfur ions (S^2-) in environment is critical to human health. In this work, a fast and convenient colorimetric sensing platform for S^2- was developed. In detail, Pt deposited on sea urchin-like CuCo₂O₄ nanostructures (Pt/CuCo₂O₄) was synthesized and demonstrated to possess enhanced peroxidase-like performance, similar to the natural horseradish peroxidase (HRP). Pt/CuCo₂O₄ can catalyze colorless 3, 3, 5, 5-Tetramethylbenzidine (TMB) to be oxidized by H₂O₂ into a blue product (oxTMB). When the above system encounters sulfur ions (S^2-), the peroxidase-like activity of Pt/CuCo₂O₄ is inhibited, accompanied with the color change of reaction solutions. On this basis, a colorimetric sensing platform for S^2- can be established. Kinetic experiments verified Pt/CuCo₂O₄ possessed a higher affinity with substrate than that of HPR. The excellent peroxidase-like performance of Pt/CuCo₂O₄ was attributed to two active species including hydroxyl radical (•OH) and superoxide radical (•O₂^-) in the catalytic process. The linear range of the proposed sensing platform for S^2- was 0.5-10 μM as well as the low limit of detection is 85.9 nM, much lower than the World Health Organization regulations. The sensing platform had been successfully applied to the detection of S^2- in tap water and lake water, which provided a convenient method for detecting S^2- in wastewater.

检测环境中的硫离子 (S ^2- ) 对人类健康至关重要。在这项工作中，开发了一种快速方便的 S ^2-比色传感平台。具体而言，合成了沉积在海胆状CuCo ₂ O ₄纳米结构（Pt/CuCo ₂ O ₄）上的Pt，并证明其具有增强的类过氧化物酶性能，类似于天然辣根过氧化物酶（HRP）。Pt/CuCo ₂ O ₄可催化无色3,3,5,5-四甲基联苯胺(TMB)被H ₂ O ₂氧化成蓝色产物(oxTMB)。当上述系统遇到硫离子（S ^2-)，Pt/CuCo ₂ O ₄的类过氧化物酶活性受到抑制，伴随反应溶液颜色的变化。在此基础上，可以建立S ^2-的比色传感平台。动力学实验证实Pt/CuCo ₂ O ₄对底物的亲和力高于HPR。_{Pt/CuCo 2} O ₄优异的类过氧化物酶性能归因于催化过程中羟基自由基(•OH)和超氧自由基(•O ₂ ^{- )两种活性物种。}所提出的 S ^2-传感平台的线性范围为 0.5-10 μM 以及检测下限为 85.9  nM，远低于世界卫生组织的规定。该传感平台已成功应用于自来水和湖水中S ^2-的检测，为废水中S ^{2-的检测提供了便捷的方法。}