百里香酚在聚甲苯胺蓝/多壁碳纳米管修饰电极上的电催化氧化动力学研究  

Study of electrocatalytic oxidation kinetics of thymol at polymeric toluidine blue/multi-walled carbon nanotubes modified electrode

作　　者：李娟娟[1] 李将渊[1] 年作权[1] 

机构地区：[1]化学合成与污染控制四川省重点实验室,西华师范大学化学化工学院,四川南充637009

出　　处：《化学研究与应用》2013年第2期163-168,共6页Chemical Research and Application

基　　金：四川省南充市科学技术局重点科研项目(N2008-SF003)资助

摘　　要：采用电聚合、滴涂及多层修饰方法制备了4种修饰电极,百里香酚在几种修饰电极上均是不可逆电氧化反应,其中聚甲苯胺蓝/多壁碳纳米管修饰电极的电催化效果最佳,过电位降低了111mV,氧化峰电流增大了5倍。在pH为7.69的PBS溶液中,百里香酚在聚甲苯胺蓝/多壁碳纳米管修饰电极上是电子转移数和质子数均为1的扩散控制不可逆电氧化过程,扩散系数D=4.8470×10-4cm2/s,电极有效面积A=0.0383cm2。氧化峰电流ip与浓度c在9.0×10-6～5.0×10-4mol/L范围内呈良好的线性关系:ip(A)=-3.781×10-5-0.0491c(mol/L),相关系数R=-0.9958,样品测定回收率为96.88%～101.50%。Four modified electrodes were prepared by eleetropolymerized,drop-coated and multi-layer modified methods. The oxida- tion process of thymol at the four modified electrodes were all irreversible, the polymeric toluidine blue/multi-walled carbon nano- tubes modified electrode showed excellent electrochemical catalytic activities towards the oxidation of thymol,overpotential reduced 111 mV, the oxidation peak current increase by five times. In PBS supporting electrolyte with pH of 7.69, thymol at PBT/MWNT/GC was mainly controlled by diffusion. Some kinetic parameters were calculated ,the electron transfer number（n） ,proton transfer num- ber（m） wasl, respectively, diffusion coeffcient （D） was 4. 8470 x 10^-4 em2/s, the effective area of electrode （ A ） was 0. 0383em2, a good linearity relationship between peak current and concentration of thymol in the range of 9. Ox 10^-6～5.0x 10^-4 mol/L was found, ip （A） = -3. 781 x 10^-5 -0. 0491c （ tool/L）, the correlative coefficient R = -0. 9958, and the recovery was between 96. 88% and 101.50%.

关 键 词：百里香酚 甲苯胺蓝 电催化氧化 动力学 

分 类 号：O657.1[理学—分析化学]