School of Electronic and Electrical Engineering, Hubei Province Engineering Research Center for Intelligent Micro-Nano Medical Equipment and Key Technologies, Wuhan Textile University, Wuhan, 430200, People's Republic of China.
Department of Hepatobiliary Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
Mikrochim Acta. 2022 Sep 13;189(10):381. doi: 10.1007/s00604-022-05475-3.
Different morphology of N-doped carbon materials, including three-dimensional interconnected N-doped hierarchically porous carbon networks (3D-NC), two-dimensional ultrathin porous carbon nanosheets (2D-NC), and bulk N-doped carbon with micron size (bulk-NC), was easily prepared by using NaCl crystal templates-assisted strategy. Compared with bare glassy carbon, bulk-NC, and 2D-NC, the as-synthesized 3D-NC exhibits excellent electrochemical activity toward the oxidation and sensing of three kinds of common environmental pollutants dihydroxybenzene isomers (hydroquinone (HQ), catechol (CC), and resorcinol (RS)). The impressive electrochemical activity of 3D-NC can be interpreted by its large specific surface area, continuous network-like morphology, superior electro-catalytic ability, and strong accumulation efficiency. Differential pulse voltammetry (DPV) test showed the 3D-NC-modified electrode exhibited three well-separated oxidation peaks at 0.05 V, 0.14 V, and 0.45 V vs. saturated calomel electrode (SCE) for HQ, CC, and RS, and their detection limits were evaluated to be as low as 0.0044, 0.012, and 0.016 mg L, respectively. Finally, a novel electrochemical analytical platform is successfully fabricated for the simultaneous monitoring of hydroquinone, catechol, and resorcinol with high sensitivity. When used for real wastewater samples analysis, recovery ratio ranging from 94 to 108% with lower than 5% of relative standard deviation (RSD) values was achieved. This work proves a facile strategy to prepare morphology-controlled N-doped carbon-based material and demonstrates its high application potential for environmental monitoring and electrochemical analysis.
不同形态的氮掺杂碳材料，包括三维相互连接的氮掺杂分级多孔碳网络（3D-NC）、二维超薄多孔碳纳米片（2D-NC）和微米尺寸的块状氮掺杂碳（bulk-NC），可以通过使用 NaCl 晶体模板辅助策略轻松制备。与裸玻碳、块状-NC 和 2D-NC 相比，所合成的 3D-NC 对三种常见环境污染物二羟基苯异构体（对苯二酚（HQ）、邻苯二酚（CC）和间苯二酚（RS））的氧化和传感表现出优异的电化学活性。3D-NC 的令人印象深刻的电化学活性可以通过其大的比表面积、连续的网络状形态、优异的电催化能力和强的积累效率来解释。差分脉冲伏安法（DPV）测试表明，3D-NC 修饰电极在 0.05 V、0.14 V 和 0.45 V 相对于饱和甘汞电极（SCE）处表现出三个分离良好的氧化峰，用于 HQ、CC 和 RS，其检测限分别低至 0.0044、0.012 和 0.016 mg L。最后，成功构建了一种用于同时监测对苯二酚、邻苯二酚和间苯二酚的新型电化学分析平台，具有高灵敏度。当用于实际废水样品分析时，回收率范围在 94%至 108%之间，相对标准偏差（RSD）值低于 5%。这项工作证明了一种制备形态可控的氮掺杂碳基材料的简便策略，并展示了其在环境监测和电化学分析方面的高应用潜力。
