一种基于纳米氧化铝/石墨烯复合膜修饰的对硫磷电化学传感器

江汉大学学报（自然科学版） ›› 2015, Vol. 43 ›› Issue (3): 204-209.

• 光电化学材料与器件研究 • 上一篇下一篇

一种基于纳米氧化铝/石墨烯复合膜修饰的对硫磷电化学传感器

宋斌^a,b，徐俊晖^b，王亚珍^*a,b

江汉大学 a. 光电化学材料与器件省部共建教育部重点实验室，湖北武汉 430056；b. 化学与环境工程学院，湖北武汉 430056

出版日期:2015-06-28 发布日期:2015-07-02
通讯作者: 王亚珍
作者简介:宋斌（ 1989—），男，硕士生，研究方向：电化学传感与检测。
基金资助:
武汉市科技局科技计划项目（ 201250499145-9）；江汉大学研究生科研创新基金项目（ 301004210001）

A Parathion Electrochemical Sensor Based on Nano-Al2O3/Graphene Composite Film Modified Electrode

SONG Bin^a,b,XU Junhui^b,WANG Yazhen^*a,b

a. Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education； b. School of Chemistry and Environemental Engineering， Jianghan University， Wuhan 430056， Hubei， China

Online:2015-06-28 Published:2015-07-02

摘要/Abstract

摘要： 制备了一种纳米氧化铝/石墨烯（ Al₂O_a/Gr）复合膜修饰的对硫磷电化学传感器，用电子扫描显微技术（ SEM）表征了复合膜的表面形貌，用循环伏安法研究了对硫磷（ PT）在复合膜及单层膜修饰的电极表面的电化学行为。研究表明：在 pH 为 5. 2 的醋酸缓冲液中开路富集 2. 5 min 时， PT 的还原峰电流最大。在优化实验条件下，PT 的还原峰电流 i_pc 与其浓度在 0. 05~60 μM 范围内呈良好线性关系，线性回归方程为 i_pc (μA） =5. 666+0. 693 7 c（ μM）， R =0. 996 4，检测限可达 20 nM（ S / N =3）。该传感器稳定性好、重现性佳，且具有一定抗干扰能力。用加标回收法测量新鲜小白菜样品中 PT 含量，回收率在 94. 5%~101. 0%，结果令人满意。

关键词: 石墨烯（ Gr）, 纳米 Al₂O₃, 对硫磷, 电化学传感器

Abstract: A parathion electrochemical sensor based on nano-Al₂O₃/graphene composite film modified electrode has been developed. Scanning electron microscopy（ SEM） was used to characterize the surface morphology of nano-Al₂O₃ film and nano-Al2O3/graphene composite film. The electrochemical behavior of parathion at the sensor was investigated by cyclic voltammetry（ CV） and linear sweep voltammetry（ LSV）.Compared with bare glassy carbon electrode， the sensor showed good catalysis for the redox of parathion due to porous structure of nano-Al2O3 and excellent conductivity of graphene. The optimized experimental conditions were obtained. The results indicated that the LSV responses of parathion were linear with concentrations in the range of 0. 05 to 60 μM with linear equation of i_pc（ μA） = 5. 666+0. 693 7 c（ μM）in pH 5. 2 acetate buffer with open circuit accumulation for 2.5 min. The detection limit was 20 nM（ S / N =3） and R =0. 996 4. The sensor exhibited high sensitivity and good selectivity as well as certain anti-interference ability. It was applied to the determination of residual parathion in fresh cabbage sample with the recovery of 94. 5%~101. 0%. The results were satisfactory.

Key words: graphene, nano-Al₂O₃, parathion, electrochemical sensor

中图分类号:

O657.15

宋斌，徐俊晖，王亚珍. 一种基于纳米氧化铝/石墨烯复合膜修饰的对硫磷电化学传感器[J]. 江汉大学学报（自然科学版）, 2015, 43(3): 204-209.

SONG Bin， XU Junhui， WANG Yazhen. A Parathion Electrochemical Sensor Based on Nano-Al2O3/Graphene Composite Film Modified Electrode[J]. Journal of Jianghan University(Natural Science Edition), 2015, 43(3): 204-209.

一种基于纳米氧化铝/石墨烯复合膜修饰的对硫磷电化学传感器

A Parathion Electrochemical Sensor Based on Nano-Al2O3/Graphene Composite Film Modified Electrode

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