PBPB-GO复合膜修饰电极的研制及其在快速检测亚硝酸盐中的应用  

Development of composite membrane modified electrode and its application in rapid detection of nitrites

作　　者：李林 赵敏[2] 鲍彦舟 胡杰 颜家保 LI Lin;ZHAO Min;BAO Yan-zhou;HU Jie;YAN Jia-bao(Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials,School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;School of Information Science and Engineering,Wuhan University of Science and Technology,430081,China;School of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China)

机构地区：[1]武汉科技大学化学与化工学院,煤转化与新型炭材料湖北省重点实验室,湖北武汉430081 [2]武汉科技大学信息科学与工程学院,湖北武汉430081 [3]武汉轻工大学化学与环境工程学院,湖北武汉430023

出　　处：《现代化工》2024年第10期150-155,共6页Modern Chemical Industry

基　　金：湖北省技术创新专项重大项目(2017ACA179);武汉科技大学“十四五”湖北省特色学科项目(2023B0501)。

摘　　要：通过改进的hummers法合成氧化石墨烯,将氧化石墨烯(GO)分散液滴涂至玻碳电极表面,然后利用电聚合法将聚溴酚蓝(PBPB)修饰到电极上,成功制备出PBPB-GO复合膜修饰的NO^(-)_(2)检测电极。利用扫描电镜对电极材料的形貌进行表征,并对NO^(-)_(2)在复合材料上的电化学氧化机理进行了探讨。采用计时电流法对NO^(-)_(2)进行定量检测。结果表明,制备的复合膜修饰电极响应电流与NO^(-)_(2)浓度在1.0×10^(-6)~1.0×10^(-)_(2)mol/L范围内呈良好的线性关系,检出限为6.41×10^(-7)mol/L(S/N=3),电极稳定性高、重现性好、抗干扰能力强。依据国标法提取榨菜中的亚硝酸盐,用该复合电极对其进行加标回收实验,加标回收率为104.90%~112.80%,与分光光度法相比,该法的相对误差为3.49%~9.43%。Graphene oxide(GO)is synthesized through the modified Hummers method,and graphene oxide dispersed droplets are coated on the surface of glass carbon electrode,which are then modified by polybromophenol blue(PBPB)through electro-polymerization to obtain PBPB-GO composite membrane modified electrode for NO^(-)_(2)detection.The morphology of the electrode material is characterized by means of scanning electron microscope.The electrochemical oxidation mechanism of NO^(-)_(2)on the composite is explored.NO^(-)_(2)is quantitatively detected by means of chronoamperometry.Results show that the response current of the prepared composite membrane modified electrode shows a good linear relationship with NO^(-)_(2)concentration in the range of 1.0×10^(-6)-1.0×10^(-)_(2)mol·L^(-1),and the detection limit is 6.41×10^(-7)mol·L^(-1)(S/N=3).The electrode has high stability,good reproducibility and strong anti-interference ability.According to Chinas national standard method,the nitrite in pickled mustard is extracted,and used to perform the spiked recovery test by the composite electrode.The recovery rates are in the range of 104.90%-112.80%,and the relative errors are in the range of 3.49%-9.43%compared with spectrophotometry.

关 键 词：亚硝酸盐 NO^(-)_(2)传感器 复合膜修饰电极 氧化石墨烯 聚溴酚蓝 

分 类 号：O657.1[理学—分析化学]