摘要
通过水热反应在室温下和成了一种氧化锌纳米花,通过物理滴涂的方法构筑了一种氧化锌纳米花修饰的玻碳电极(ZnO/GCE),将其用于亚硝酸盐的电催化氧化研究。采用扫描电子显微镜和电化学的方法对电极的形貌及其导电性进行了表征,并利用差示脉冲伏安法研究了亚硝酸盐在该修饰电极上的电化学行为。研究结果表明:氧化锌纳米材料修饰电极对亚硝酸盐表现出良好的电催化性能,与裸电极相比,氧化锌纳米材料修饰电极能够显著提高亚硝酸盐在电极上的电化学响应信号。且在1.71μmol·L^(-1)~951μmol·L^(-1)(R2=0.9935)的浓度范围内呈现良好的线性关系,检出限为0.3μmol·L^(-1)(S/N=3)。将该修饰电极用于香肠中亚硝酸盐含量的测定,测定结果良好。该修饰电极灵敏度高,线性范围宽,稳定性和重现性良好,可用于食品中亚硝酸盐的测定。
A kind of flower-like ZnO nanomaterial was synthesized through a facile aqueous solution route at room temperature,which was used to constructing a electrosensor of zinc oxide modified electode(ZnO/GCE)by droplet coating.The zinc oxide modified electode was used to study the electrochemical behavior of nitrite.SEM and electrochemical method were utilized to characterize the surface morphology and the conductivity of the modified electrode.Here,we demonstrate electrocatalytic oxidation of nitrite on the ZnO/GCE by the method of cyclic voltammetry and differential pulse voltammetry respectively.The results showed that the ZnO modified electrode has shown favourable improvement in oxidation peak current compared to bare glassy carbon electrode.The oxidation currents of nitrite were found to be linearly related to concentration over the range 1.71 to 951μM with a correlation coefficient of 0.9935 and the detection limits was calculated to be 0.3μM(S/N=3).The ZnO/GCE showed a satisfactorily result in quantitative determination of nitrite in the food sample of sausage.The ZnO/GCE showed high sensitivity,wide linearity,good reproducibility and stability,and can be used in nitrite determination in food sample.
作者
连欢
李金涛
刘凤平
赖柔柔
张翠忠
向刚
LIAN Huan;LI Jin-tao;LIU Feng-ping;LAI Rou-rou;ZHANG Cui-zhong;XIANG Gang(key Laboratory of Photoelectrochemical Sensing and Regionall Enviroumental Analysis,Guangxi Narmal University for Nationalities,Chongzuo 532200;Experiemntal Practising&Teaching center,Hebei GEO University,Shijiazhuang 050031)
出处
《中国食品添加剂》
CAS
北大核心
2021年第4期86-90,共5页
China Food Additives
基金
国家自然科学基金(21465004)
广西民族师范学院校级科研项目(2018YB032)。
关键词
氧化锌
修饰电极
亚硝酸盐
电催化
zinc oxide
modified electrode
nitrite
electrocatalytic
