功能化石墨烯-二硫化钼复合材料修饰电极对亚硝酸盐的电化学传感研究  

Functionalized Graphene-Molybdenum Disulfide-based Electrochemical Sensor for Detection of Nitrite

作　　者：郭伟华[1] 徐惠玲 徐杭林 曹小红[1] 刘云海[1] 曲小姝[2] GUO Wei-Hua;XU Hui-Ling;XU Hang-Lin;CAO Xiao-Hong;LIU Yun-Hai;QU Xiao-Shu(School of Chemistry and Materials Sciences,East China University of Technology,Nanchang 330013,China;College of Chemical and Pharmaceutical Engineering,Jilin Institute of Chemical Technology,Jilin 132022,China)

机构地区：[1]东华理工大学化学与材料学院,南昌330013 [2]吉林化工学院化学与制药工程学院,吉林132022

出　　处：《分析化学》2024年第11期1766-1774,共9页Chinese Journal of Analytical Chemistry

基　　金：江西省自然科学基金项目(No.20181BAB213009);国家自然科学基金项目(No.22071080)资助。

摘　　要：制备了功能化石墨烯-二硫化钼(PEI-rGO-MoS_(2))复合材料,采用扫描电镜和红外光谱对此复合物材料进行了表征。将PEI-rGO-MoS_(2)复合材料用于修饰玻碳电极(GCE),制备了亚硝酸盐电化学传感器,利用循环伏安法、线性伏安法、差分脉冲伏安法和计时电流法考察了此纳米复合材料修饰电极的电化学行为。结果表明,PEI、rGO和MoS_(2)之间的协同作用增强了复合材料对亚硝酸盐的电催化性能。在最优实验条件下,此电化学传感器检测亚硝酸根离子的检出限为0.7μmol/L,两段线性范围分别为1~20μmol/L和35~1000μmol/L,并表现出良好的选择性和稳定性。将此传感器用于自来水和碳酸饮料中亚硝酸盐的检测,加标回收率为98.0%~110.6%,相对标准偏差为0.8%~2.2%,表明此传感器具有良好的实用性。An electrochemical sensor for detection of nitrite using a polyethylenimine functionalized graphene-molybdenum disulfide nanocomposite material modified glassy carbon electrode(PEI-rGO-MoS_(2)/GCE)was reported.The characteristics of PEI-rGO-MoS_(2) nanocomposite were studied by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy.The electrochemical behavior of PEI-rGO-MoS_(2) nanocomposite modified electrode was investigated by cyclic voltammetry,linear voltammetry,differential pulse voltammetry and chronoamperometry,and it was found that the synergistic effect between PEI,rGO and MoS_(2) enhanced the electrocatalytic activity towards oxidation of nitrite.Under the optimal experimental conditions,the prepared PEI-rGO-MoS_(2)/GCE exhibited low detection limit(0.7μmol/L)and wide linear range(1-20μmol/L and 35-1000μmol/L)for nitrite,with good selectivity and stability.Furthermore,the practicability of the prepared sensor was confirmed by detection of nitrite in the actual tape water and soda water samples.The recoveries were 98.0%-110.6%,and the relative standard deviation was 0.8%-2.2%,proving application potential of this sensor.

关 键 词：二硫化钼 功能化石墨烯 亚硝酸盐 电化学传感器 

分 类 号：O657.1[理学—分析化学] TP212[理学—化学] TB332[自动化与计算机技术—检测技术与自动化装置]