Guo Jieli, Li Jin, Xing Xiujing, Xiong Wei, Li Hao
Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor & Green Chemical Technology, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
Chemistry Department, University of California, Davis, 95616, USA.
Mikrochim Acta. 2024 Aug 17;191(9):542. doi: 10.1007/s00604-024-06623-7.
As an ideal transition metal oxide, CoO is a P-type semiconductor with excellent electrical conductivity, non-toxicity and low cost. This work reports the successful construction of CoO materials derived from metal-organic frameworks (MOFs) using a surfactant micelle template-solvothermal method. The modified electrodes are investigated for their ability to electrochemically detect Pb and Cu in aqueous environments. By adjusting the mass ratios of alkaline modifiers, the morphological microstructures of CoO-X exhibit a transition from distinctive microspheres composed of fiber stacks to rods. The results indicate that CoO-1(NHF/CO(NH) = 1:0) has a distinctive microsphere structure composed of stacked fibers, unlike the other two materials. CoO-1/GCE is used as the active material of the modified electrode, it shows the largest peak response currents to Pb and Cu, and efficiently detects Pb and Cu in the aqueous environment individually and simultaneously. The linear response range of CoO-1/GCE for the simultaneous detection of Pb and Cu is 0.5-1.5 μM, with the limits of detection (LOD, S/N = 3) are 9.77 nM and 14.97 nM, respectively. The material exhibits a favorable electrochemical response, via a distinctive CoO-1 microsphere structure composed of stacked fibers. This structure enhances the number of active adsorption sites on the material, thereby facilitating the adsorption of heavy metal ions (HMIs). The presence of oxygen vacancies (O) can also facilitate the adsorption of ions. The CoO-1/GCE electrode also exhibits excellent anti-interference ability, stability, and repeatability. This is of great practical significance for detecting Pb and Cu in real water samples and provides a new approach for developing high-performance metal oxide electrochemical sensors derived from MOFs.
作为一种理想的过渡金属氧化物，氧化钴是一种具有优异导电性、无毒且成本低廉的P型半导体。本工作报道了采用表面活性剂胶束模板-溶剂热法成功构建了源自金属有机框架（MOF）的氧化钴材料。研究了改性电极在水环境中电化学检测铅和铜的能力。通过调整碱性改性剂的质量比，氧化钴-X的形态微观结构呈现出从由纤维堆叠组成的独特微球到棒状的转变。结果表明，氧化钴-1（NHF/CO(NH) = 1:0）具有由堆叠纤维组成的独特微球结构，与其他两种材料不同。将氧化钴-1/玻碳电极（GCE）用作改性电极的活性材料，它对铅和铜表现出最大的峰值响应电流，并能在水环境中单独和同时有效地检测铅和铜。氧化钴-1/GCE同时检测铅和铜的线性响应范围为0.5 - 1.5 μM，检测限（LOD，S/N = 3）分别为9.77 nM和14.97 nM。该材料通过由堆叠纤维组成的独特氧化钴-1微球结构展现出良好的电化学响应。这种结构增加了材料上活性吸附位点的数量，从而促进了重金属离子（HMI）的吸附。氧空位（O）的存在也有助于离子的吸附。氧化钴-1/GCE电极还表现出优异的抗干扰能力、稳定性和可重复性。这对于实际水样中铅和铜的检测具有重要的实际意义，并为开发源自MOF的高性能金属氧化物电化学传感器提供了一种新方法。
