Yang Xiupei, Chen Xiaofang, Yang Hanyu, Fan Yuxiu, Jiang Ling, Huo Feng
College of Chemistry and Chemical Engineering, Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637000, China.
College of Chemistry and Chemical Engineering, Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Feb 15;327:125328. doi: 10.1016/j.saa.2024.125328. Epub 2024 Oct 22.
With the development of electronics, electroplating, printing, and dyeing industries, environmental pollution caused by hexavalent chromium (Cr(VI)) has become increasingly prominent. Skin contact with Cr (VI) can cause allergies or genetic defects, and inhalation can cause cancer, which is a lasting danger to the environment and the human body. Developing effective strategies to monitor Cr(VI) in environmental water or industrial wastewater can evaluate the degree of water pollution and risk warning, thus helping to prevent the spread of Cr(VI) pollution, promote the protection of water resources and the ecological environment, and ensure human safety and sustainable development. On the basis of the regulation of dopamine, boron-doped zinc single-atom nanozymes (Zn/B-NC SAzymes) with three-dimensional nanoflower morphology were controlled in this work. The introduction of B in Zn/B-NC SAzymes and the high metal loading of Zn (6.5 wt%) led to the formation of more active sites, resulting in the material showing excellent enzyme-like activity. HO decomposed to generate superoxide radicals under the catalysis of Zn/B-NC SAzymes, which then oxidized the substrate 3,3',5,5'-tetramethylbenzidine (TMB) to generate blue oxTMB. When Cr(VI) was introduced into the sensor system, the color of blue oxTMB is deepened, and the colorimetric method of Cr(VI) was constructed. The linear range is 0.2-40 μM, LOD is 59 nM, and the visual detection of Cr (VI) is performed with the aid of the smartphone. This work not only provides experimental and theoretical guidance for understanding the active centers of Zn-SAzymes and their catalytic processes, but also provides a promising and alternative detection strategy for the rapid and even visual on-site detection of Cr(VI) in aquatic environments, which is of great significance for the control of Cr(VI) pollution in the environment and industrial wastewater.
随着电子、电镀、印刷和印染行业的发展，六价铬（Cr(VI)）造成的环境污染日益突出。皮肤接触Cr(VI)会导致过敏或基因缺陷，吸入则会致癌，这对环境和人体都是持久的危害。制定有效的策略来监测环境水或工业废水中的Cr(VI)，可以评估水污染程度并进行风险预警，从而有助于防止Cr(VI)污染的扩散，促进水资源和生态环境保护，确保人类安全与可持续发展。在多巴胺调控的基础上，本工作制备了具有三维纳米花形貌的硼掺杂锌单原子纳米酶（Zn/B-NC SAzymes）。Zn/B-NC SAzymes中B的引入以及Zn的高金属负载量（6.5 wt%）导致形成了更多的活性位点，使得该材料表现出优异的类酶活性。HO在Zn/B-NC SAzymes的催化下分解产生超氧自由基，超氧自由基进而氧化底物3,3',5,5'-四甲基联苯胺（TMB）生成蓝色的oxTMB。当将Cr(VI)引入传感器系统时，蓝色oxTMB的颜色加深，从而构建了Cr(VI)的比色检测方法。线性范围为0.2 - 40 μM，检测限为59 nM，并借助智能手机实现了对Cr(VI)的可视化检测。本工作不仅为理解Zn-SAzymes的活性中心及其催化过程提供了实验和理论指导，还为水生环境中Cr(VI)的快速甚至可视化现场检测提供了一种有前景的替代检测策略，这对于控制环境和工业废水中的Cr(VI)污染具有重要意义。
