基于中性红-碳纳米复合材料的化学修饰电极检测亚硝酸盐  

Detection of nitrites by chemically modified electrode based on neutral red-carbon nanocomposite

作　　者：黄凌霄 赵敏[2] 鲍彦舟 胡杰 颜家保 HUANG Ling-xiao;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,Wuhan 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》2023年第11期243-248,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：为了实现亚硝酸盐的灵敏检测,利用溶液剥离法和水合肼还原法制备了MWCNT@rGONR复合材料,并通过SEM和XRD等测试手段进行材料表征。将制备的复合材料滴涂在玻碳电极表面,借助简单可控的电聚合方法将中性红修饰到电极上,最终制备了PNR/MWCNT@rGONR/GCE。采用计时电流法对NO_(2)^(-)进行定量检测,结果表明,氧化峰电流与亚硝酸盐浓度在1.0×10^(-7)~1.9×10^(-3)mol/L范围内呈良好的线性关系,检出限为7.1×10^(-8)mol/L(S/N=3);同时,所制备的复合电极表现出良好的选择性和重现性。用此复合电极对某石化循环冷水进行实际水样的测定,回收率为93.26%~97.42%,相对标准偏差低于5.32%,结果较为理想。In order to realize the sensitive detection to nitrites,the solution stripping method and the hydrazine hydrate reduction method are employed to prepare [e-mail] composites are characterized by means of SEM and XRD.The prepared composite material is dropped on the surface of glassy carbon electrode,and then neutral red is modified on the electrode through a simple controllable electropolymerization method.Finally,PNR/MWCNT@rGONR/GCE is obtained.Quantitative detection of NO_(2)^(-) is proceeded by means of chronoamperometry,and it is shown there is a good linear relationship between oxidation peak current and nitrite concentration in the range of 1.0×10^(-7)-1.9×10^(-3)mol·L^(-1).The detection limit is 7.1×10^(-8)mol·L^(-1)(S/N=3).In addition,the prepared composite electrode shows good selectivity and reproducibility.As this composite electrode is applied to detect the circulating cold water sample in a petrochemical plant,the recovery is 93.26%-97.42%,and the relative standard deviation is lower than 5.32%,presenting a satisfactory result.

关 键 词：亚硝酸盐 羧基化碳纳米管 聚中性红 玻碳电极 电化学传感器 

分 类 号：TQ150[化学工程—电化学工业]