State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510640, China.
State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510640, China.
J Colloid Interface Sci. 2022 Feb;607(Pt 2):1313-1322. doi: 10.1016/j.jcis.2021.09.036. Epub 2021 Sep 16.
A highly sensitive electrochemical sensor was developed through a one-pot green synthesis method for nitrite detection based on the electrochemical technique. Xylan-based carbon quantum dots (CQDs) were used as green in situ reducing agent to prepare CQDs capped gold nanoparticles (Au@CQDs). MXene of good electrical conductivity was used as the immobilized matrix to fabricate Au@CQDs-MXene nanocomposites with the advantages of good electrical conductivity and electrocatalysis. An electrochemical sensor for nitrite monitor was obtained by loading the Au@CQDs-MXene on a glassy carbon electrode. The sensor presents high sensitivity, good stability, wide linear range, and excellent selectivity due to the high catalytic activity of AuNPs and CQDs, the large specific surface area of MXene, and exceptional electrical conductivity of AuNPs and MXene. Under the optimal condition, the linear detection range of the sensor was from 1 μM to 3200 μM with a detection limit of 0.078 μM (S/N = 3), which was superior to most reported sensors using differential pulse voltammetry (DPV) method. Furthermore, this sensor was successfully applied to detect nitrite in tap water and salted vegetables with satisfactory recoveries. This modified electrocatalytic sensor shows a new pathway to fabricate nitrite detection sensor with feasibility for practical application.
一种基于电化学技术的亚硝酸根检测的高灵敏度电化学传感器是通过一锅绿色合成方法开发的。基于木聚糖的碳量子点（CQDs）被用作绿色原位还原剂来制备 CQDs 封端的金纳米粒子（Au@CQDs）。具有良好导电性的 MXene 被用作固定基质，以制备具有良好导电性和电催化性能的 Au@CQDs-MXene 纳米复合材料。通过将 Au@CQDs-MXene 负载到玻碳电极上，获得了用于监测亚硝酸盐的电化学传感器。由于 AuNPs 和 CQDs 的高催化活性、MXene 的大比表面积以及 AuNPs 和 MXene 的出色导电性，该传感器具有高灵敏度、良好的稳定性、宽线性范围和优异的选择性。在最佳条件下，传感器的线性检测范围为 1μM 至 3200μM，检测限为 0.078μM（S/N=3），优于大多数使用差分脉冲伏安法（DPV）的报道传感器。此外，该传感器成功应用于检测自来水中和腌制蔬菜中的亚硝酸盐，回收率令人满意。这种改进的电催化传感器为制备亚硝酸根检测传感器提供了一种新途径，具有实际应用的可行性。
