基于功能材料的电化学传感器检测新烟碱类杀虫剂的研究进展

基于纳米材料的电化学分析技术已成为快速检测新烟碱类杀虫剂的研究热点。尤其是新型功能材料的应用,对拓宽农药传感器的适用性和增大检测范围具有重要意义。该文以功能材料为核心,梳理了适配体、分子印迹、光电材料、碳纳米材料、有机框架材料等新型功能材料的最新发展,重点阐述了功能材料在构建新烟碱类杀虫剂电化学传感器中的突出作用、优缺点及最新进展,并对基于功能材料的各类新烟碱类杀虫剂电化学传感器的未来发展进行了展望,以期为其深入研究与应用提供参考。     

Detection of sulfamethazine by voltammetry based on γ -cd/g-c3n4 nanosheets modified electrodeEI北大核心CSCD

Bulk carbon nitride (b-C3N4) was prepared from melamine by thermal polymerization method. The graphitic carbon nitride (g-C3N4) was prepared by recombining ultrasonication method, and γ-CD/g-C3N4 composites were obtained by ultrasonication g-C3N4 with γ-cyclodextrin (γ-CD). The working electrode of the sensor for sulfamethazine (SM2) detection was decorated by γ-CD/g-C3N4 on glassy carbon electrode (GCE). Electrochemical analysis of SM2 was performed under optimized conditions, and the results showed that the determination of SM2 on this electrode was controlled by adsorption. The linear range of this method was 1-150 µmol/L and 150750 µmol/L with a detection limit of 0.79 µmol/L. Results showed that the determination was not interfered after adding 50 times K+, Ca2+, Fe3+, Cu2+, NH4+, SO42−, NO3−, chlortetracycline hydrochloride, vitamins, paraaminobenzoic acid and other interfering substances. In addition, the peak currents retained 93% and 87% of the original response after the electrode was stored for 5 d and 10 d at 5°C, respectively. This method was successfully applied to determine the levels of SM2 in milk samples with good recoveries ranging from 84% to 113% and the relative standard deviations (RSD) was lower than 5%. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

基于电剥离石墨烯传感器伏安法检测杀螟硫磷

以石墨片为原料,在硫酸铵电解液中利用电化学剥离的方法制备了一种石墨烯（eGr）。将该材料修饰到玻碳电极（GCE）表面构建了电化学传感器,利用该传感器探究了杀螟硫磷的电化学行为。对缓冲溶液pH、电极修饰量等实验条件进行了优化。结果表明：该电极具有较大的活性比表面积以及良好的电子转移速度,对杀螟硫磷具有良好的电催化氧化作用。通过线性扫描伏安法检测了杀螟硫磷,其线性响应浓度在1～100μmol/L之间,检出限为70 nmol/L。该传感器可应用于河水中杀螟硫磷的残留分析,回收率为97.2%～100.3%。