摘要
本文采用简单的水热反应制备了CuFeO_2/氧化石墨烯(CuFeO_2/GO)杂化材料,并分别采用扫描电镜和X射线衍射对其进行了表征。将该材料修饰至玻碳电极(GCE)上,研究对亚硝酸盐的电化学响应。结果表明,与裸GCE、GO/GCE以及CuFeO_2/GCE相比,亚硝酸盐在CuFeO_2/GO/GCE上的氧化峰电流最大,氧化峰电位明显正移。在最佳实验条件下,CuFeO_2/GO/GCE对亚硝酸盐的氧化峰电流和亚硝酸盐浓度在0.1~100μmol/L之间呈良好线性关系,检测限(信噪比为3)达33nmol/L,而且该修饰电极测定亚硝酸盐的选择性、重复性和稳定性较好,已经成功用于真实样品中亚硝酸盐的测定。CuFeO_2提供有效的电子传递界面以及GO具备的高电导性和大比表面积所发挥的协同作用使得复合材料展现出优异的电催化性能。表明该复合材料可发展用于灵敏高效测定亚硝酸盐的电化学传感器。
In this work,a hybrid composite based on CuFeO_2 and graphene oxide（GO）was prepared by simple hydrothermal reaction and characterized by scanning electron microscopy and X-ray diffraction.Then this composite was modified onto glass carbon electrode（GCE）as a novel electrochemical sensor for nitrite.Compared with the bare GCE,GO/GCE and CuFeO_2/GCE,the oxidation behavior of nitrite at a CuFeO_2/GO/GCE exhibited the highest electrocatalytic activity in phosphate buffer by cyclic voltammetry.The enhanced oxidation current and more negative oxidation potential of CuFeO_2/GO/GCE to nitrite were contributed to the synergic effect of CuFeO_2 and GO with high conductivity,large surface area,and effective electron-transfer platform.Under the optimum operating conditions,the oxidation peak current was linear with the concentration of nitrite in the range of 0.1-100μmol/L with a detection limit of 33 nmol/L（S/N =3）.Moreover,the CuFeO_2/GO/GCE showed remarkable selectivity,repeatability and stability for the oxidation of nitrite.The sensor was successfully applied to the determination of nitrite in real samples.So this proposed CuFeO_2/GO hybrids can be constucted a promising electrochemical sensor for sensitive and convenient nitrite detection.
作者
张奥亚
吴芳辉
杨俊卿
高春新
何鹏飞
ZHANG Ao-ya;WU Fang-hui;YANG Jun-qing;GAO Chun-xin;HE Peng-fei(School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma＇anshan 24300)
出处
《分析科学学报》
CAS
CSCD
北大核心
2018年第5期659-663,共5页
Journal of Analytical Science
基金
国家自然科学基金(No.21271006)
安徽省教育厅自然科学重点基金(No.KJ2015A024)
安徽省大学生创新创业训练计划(No.AH201510360177
AH201610360164)
