复合材料修饰电极伏安法测定对氯苯酚  

Voltammetric determination of p-chloro phenol based on the composite material modified electrode

作　　者：王安亭[1] 卫应亮[1] 唐波[1] 李超[2] 

机构地区：[1]洛阳理工学院环境工程与化学系,河南洛阳471023 [2]郑州轻工业学院材料与化工学院,河南郑州450002

出　　处：《化学研究与应用》2013年第8期1218-1222,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(20871107)资助;河南省基础与前沿技术研究计划项目(122300410031)资助;河南省高等学校青年骨干教师资助计划项目(2009GGJS_123)资助;河南省教育厅自然科学研究计划项目(2010B150019)资助

摘　　要：制备了纳米金/碳纳米管复合修饰电极,研究了对氯苯酚在此修饰电极上的电化学行为,结果表明对氯苯酚在磷酸盐缓冲液(PBS)中有良好的伏安曲线。在pH为6.5,14μL修饰剂用量,富集时间为30s时,对氯苯酚于0.645V处有一灵敏的氧化峰。在对氯苯酚浓度为9.0×10-7～1.0×10-5mol.L-1时,峰电流与浓度呈良好的线性范围。在扫速为0.01～0.3V.s-1时,氧化峰电流与扫速呈线性关系,表明对氯苯酚的电极反应是受吸附控制的电极过程。计时电量实验中得到电量与时间的平方根的线性关系,其斜率为2.024μC/s1/2,根据Cottrell方程积分式得到扩散系数(D)为4.62×10-7cm2.s-1。根据所推导出的电荷转移数、参与反应的质子数,提出了对氯苯酚的电化学反应过程。In this work,a novel modified electrode,namely,nano-gold/carbon nanotubes composite modified electrode was developed,and the electrochemical behavior of p-chlorophenol（p-CP）at this modified electrode was investigated systematically.The result indicated that p-chlorophenol showed stable voltammetric response in phosphate buffer solution（PBS）.A sensitive oxidation peak of p-CP was observed at the potential of 0.645V.The effect factors of the electrochemical response of p-CP,such as solution pH,the amount of modifier and accumulation time and so on were carefully optimized.The results are as follows：pH=6.5,14 μL modifier and 30 seconds accumulation.Under the optimum conditions,a good linear relationship was obtained in the range of 9.0×10-7～1.0×10-5mol·L-1.The oxidation peak current increases linearly with scanning speed in the range of 0.01～0.3V·s-1,which suggesting that the electrochemical oxidation process of p-CP on this modified electrode is absorption-controlled process.Based on chronocoulometry result,the diffusion coefficient（D）could be estimated and the result was 4.62×10-7cm2 ·s-1.According to the proton number and the electron transfer number of p-chlorophenol oxidation,we proposed the probable process of the electrode reaction.

关 键 词：对氯苯酚 碳纳米管 纳米金粒子 修饰电极 

分 类 号：O657.1[理学—分析化学]