基于MoS2/氮掺杂石墨烯纳米复合材料灵敏电化学传感器检测镉(II)  

Sensitive electrochemical sensor for detection of Cd(Ⅱ)using MoS/nitrogendoped graphenenanoparticles

作　　者：于志辉[1] 蒲渝文 鲁理平[1] YU Zhihui;PU Yuwen;LU Liping(Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology,Beijing 100124)

机构地区：[1]北京市区域空气污染控制重点实验室,北京工业大学,北京100124

出　　处：《分析试验室》2021年第1期17-20,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(21876005);北京市自然科学基金重点项目(Z2018222)资助。

摘　　要：基于S-Cd和N-Cd的亲和作用,利用一锅法制备了MoS2-掺氮石墨烯(NG)新型纳米复合材料。采用方波溶出伏安法实现了Cd^(2+)的灵敏测定。在最优实验条件下,Cd^(2+)的溶出峰电流与Cd^(2+)的浓度在0.01~20μmol/L范围内呈线性关系(R^(2)=0.996),检出限为2.50 nmol/L。该传感器可用于监测实际样品中Cd^(2+)。Molybdenum sulfide/nitrogen-doped graphene(MoS2/NG)nanoparticles were prepared,which exploited the high heavy metal adsorption capacity of flower-like MoS2 and excellent electrical conductivity of NG.The electrochemical properties of the MoS2/NG-modified glassy carbon electrode(GCE)were studied by square-wave anodic stripping voltammetry.The electrochemical conditions,such as the pH of the buffer solution,content of MoS2/NG on the electrode surface,deposition potential,and deposition time,were optimized.Under the optimal conditions,the fabricated sensor showed a highly linear response from 0.01 to 20μmol/L and an estimated detection limit of 2.50 nmol/L for Cd^(2+).In addition,interference studies were performed.The sensitivity of the MoS2/NG/GCE sensor towards Cd(Ⅱ)did not change much in the presence of other coexisting heavy metal ions.Further experiments showed that the MoS2/NG/GCE sensor possessed good stability and reproducibility.Finally,accurate detection of Cd(Ⅱ)in river water samples by the MoS2/NG/GCE sensor indicates its potential to monitor Cd(Ⅱ)in real samples.

关 键 词：二硫化钼 氮掺杂石墨烯 溶出伏安法 镉 

分 类 号：O657.1[理学—分析化学]