摘要
研究了硝基苯在羧基化多壁碳纳米管修饰电极上的电化学行为,探讨了硝基苯的电还原机理。结果表明：在0.2 mol.L-1硫酸溶液中,修饰电极对硝基苯具有明显的催化作用,其还原峰电位由裸玻碳电极上-0.44 V正移至-0.35 V,正移了90 mV;氧化峰电位由0.35 V负移至0.30 V,负移了50 mV。采用循环伏安法进行硝基苯定量测定,其还原峰电流与浓度在5.0×10-7-4.2×10-5mol.L-1范围内呈线性关系,检出限（3S/N）为8.2×10-8mol.L-1。用于湖水样品中硝基苯的测定,并用标准加入法作回收试验,回收率在98.3%-100.6%之间。
Electrochemical behaviour of nitrobenzene at the GCE modified with carboxylated multwall carbon nanotubes was studied and its mechanism of electrochemical reduction was discussed.It was found that in 0.2 mol·L-1 H2SO4 solution,the reduction of nitrobenzene at the modified electrode was remarkably catalyzed,showing a positive shift of the reductive peak potential of 90 mV as from-0.44 V（at the bare GCE） to-0.35 V（at the modified electrode of CMWCNT′s/GCE） and a negative shift of the oxidative peak potential of 50 mV as from 0.35 V（at the bare GCE） to 0.30 V（at the modified GCE）.Cyclic voltammetric determination of nitrobenzene was performed in the linearity range of 5.0×10-7-4.2×10-5mol·L-1 in respective to the values of reductive peak current.Value of detection limt（3S/N） found was 8.2×10-8mol·L-1.Using the sample of lake water as matrix,test for recovery was made by standard addition method,and values of recovery found were in the range of 98.3%-100.6%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2010年第5期521-524,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
湖北省自然科学基金杰出青年人才计划项目(2006ABB039)
关键词
循环伏安法
多壁碳纳米管
硝基苯
Cyclic voltammetry
Multiwall carbon nanotubes
Nitrobenzene
