Li Dewang, Xu Shuai, Jin Haiyan, Wang Jinqing, Yan Fei
Donghai Laboratory, Zhoushan 316021, China.
Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China.
Molecules. 2023 Nov 10;28(22):7515. doi: 10.3390/molecules28227515.
The nitrate ion (NO) is a typical pollutant in environmental samples, posing a threat to the aquatic ecosystem and human health. Therefore, rapid and accurate detection of NO is crucial for both the aquatic sciences and government regulations. Here we report the fabrication of an amino-functionalized, vertically ordered mesoporous silica film (NH-VMSF) confining localized copper nanoparticles (CuNPs) for the electrochemical detection of NO. NH-VMSF-carrying amino groups possess an ordered perpendicular nanochannel structure and ultrasmall nanopores, enabling the confined growth of CuNPs through the electrodeposition method. The resulting CuNPs/NH-VMSF-modified indium tin oxide (ITO) electrode (CuNPs/NH-VMSF/ITO) combines the electrocatalytic reduction ability of CuNPs and the electrostatic attraction capacity of NH-VMSF towards NO. Thus, it is a rapid and sensitive electrochemical method for the determination of NO with a wide linear detection range of 5.0-1000 μM and a low detection limit of 2.3 μM. Direct electrochemical detection of NO in water samples (tap water, lake water, seawater, and rainwater) with acceptable recoveries ranging from 97.8% to 109% was performed, demonstrating that the proposed CuNPs/NH-VMSF/ITO sensor has excellent reproducibility, regeneration, and anti-interference abilities.
硝酸根离子（NO）是环境样品中的典型污染物，对水生生态系统和人类健康构成威胁。因此，快速准确地检测NO对水生科学和政府监管都至关重要。在此，我们报道了一种用于电化学检测NO的载有氨基的垂直有序介孔二氧化硅膜（NH-VMSF）的制备，该膜限制了局部铜纳米颗粒（CuNPs）的存在。带有氨基的NH-VMSF具有有序的垂直纳米通道结构和超小纳米孔，能够通过电沉积方法实现CuNPs的受限生长。所得的CuNPs/NH-VMSF修饰的氧化铟锡（ITO）电极（CuNPs/NH-VMSF/ITO）结合了CuNPs的电催化还原能力和NH-VMSF对NO的静电吸引能力。因此，它是一种快速灵敏的电化学方法，用于测定NO，线性检测范围宽，为5.0 - 1000 μM，检测限低至2.3 μM。对自来水、湖水、海水和雨水等水样中的NO进行了直接电化学检测，回收率在97.8%至109%之间，表明所提出的CuNPs/NH-VMSF/ITO传感器具有出色的重现性、再生能力和抗干扰能力。
