摘要
目的将离子液体(N-己基吡啶六氟磷酸盐,[HPy][PF_6])与石墨粉混合,制备离子液体碳糊电极(CILE);再将石墨烯溶液(GR)滴涂在CILE表面,制备石墨烯修饰离子液体碳糊电极(GR/CILE)。建立GR/CILE测定对乙酰氨基酚的电化学方法。方法采用循环伏安法对比研究对乙酰氨基酚在CILE和GR/CILE上的电化学和电催化行为,采用微分脉冲伏安法建立GR/CILE测定对乙酰氨基酚含量的新方法。结果 GR/CILE对对乙酰氨基酚的氧化还原具有明显的电催化作用;在0.1V·s^(-1)扫速下,对乙酰氨基酚的氧化还原峰电位差(ΔE_P)为87mV;在1.0×10^(-6)~5.0×10^(-4) mol·L^(-1)范围内,其氧化峰电流与浓度之间呈良好线性(r=0.995 6),检出限为3.0×10^(-7) mol·L^(-1)(S/N=3)。结论该GR/CILE修饰电极成功用于片剂中对乙酰氨基酚含量的测定,且其电子转移速率和灵敏度优于CILE电极。
Purposes--To get a graphene(GR) nanocomposite modified CILE (GR/CILE) after immobilizing GR on the surface of CILE prepared by mixing ionic liquid N-hexyl pyridinium hexafluo- phosphate ([HPy] [PF6]) with graphite powder, and to determine paracetamol at GR/CILE. Methods--The electrochemical behavior and electrochemical catalytic behavior of paracetamol are investigated with cyclic voltammetry at CILE and GR/CILE. The determination of paracetamol is attained with differential pulse voltammetry at GR/CILE. Results--The peak-to-peak potential separa- tion (△Ep) of paracetamol is 0. 087 V with the scan rate of 0.1 V/s. The results show that GR/CILE exhibits better electrocatalysis for the redox of paracetamol. The oxidation peak current versus concentration of paracetamol at GR/CILE shows linearity in the range of 1.0× 10-6 -5.0× 10-4mol L-1(r=0. 995 6) with a detection limit of 3.0× 10-7 mol L-1. Conclusions--The differential pulse voltammetry is applied to determine paracetamol in tablets successfully at GR/CILE, and the electron transfer rate and sensitivity are better than those at CILE.
出处
《宝鸡文理学院学报(自然科学版)》
CAS
2017年第2期36-41,共6页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
陕西省教育厅科学研究专项科研计划项目(16JK2003)
关键词
伏安法
电催化
离子液体碳糊电极
石墨烯
对乙酰氨基酚
voltammetry
electro-catalysis
ionic liquid carbon paste electrode
graphene
parac-etamol