用碳纳米管-纳米TiO_2/Nafion修饰电极测定对苯二酚  

Determination of Hydroquinone Using Carbon Nanotube-Nano TiO_2/Nafion Modified Electrode

作　　者：蒋茹[1] 朱华跃[1,2] 管玉江[1] 袁青青[1] 

机构地区：[1]台州学院环境工程系,浙江台州317000 [2]武汉大学资源与环境科学学院,湖北武汉430072

出　　处：《化工环保》2011年第3期277-281,共5页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金青年项目(21007044)

摘　　要：利用Nafion(商品名,杜邦公司生产的一种聚四氟乙烯阳离子交换膜)的成膜作用,将纳米TiO2和碳纳米管同时负载到玻碳电极表面,制得碳纳米管-纳米TiO2/Nafion修饰电极,研究了对苯二酚在该修饰电极上的循环伏安电化学行为。实验结果表明:与玻碳电极相比,该修饰电极在对苯二酚的0.1mol/L H2SO4溶液体系中的氧化还原电流明显增大;当支持电解质为0.1mol/L H2SO4溶液、扫描速率为50mV/s时,循环伏安电流Ipa与对苯二酚浓度c在1.0×10-6～1.0×10-3mol/L范围内呈良好的线性关系,回归方程为Ipa=3.614 93+0.126 45c(相关系数为0.998 7,n=15),检出限(3σ)为1.60×10-7mol/L;该修饰电极用于测定模拟废水中对苯二酚浓度,回收率为95.03%～104.01%,结果令人满意。The carbon nanotubes （CNTs）-nano TiO2/Nafion modified electrode was prepared by loading nano-TiO2 and CNTs on the surface of glassy carbon electrode using the film-forming function of Nation （a product of polytetrafluoroethylene cation exchange membrane made in DuPont）. The electrochemical behavior of hydroquinone （HQ） on the modified electrode was studied by cyclic voltammetry. The experimental results show that： The redox current of the modified electrode in the 0.1 mol/L H2 SO4-HQ solution is much larger than that of the bare glassy carbon electrode; When using 0. 1 mol/L H2 SO4 solution as supporting electrolyte and the scanning rate is 50 mV/s, the current（Ipa） has a good linear relationship with the HQ concentration（c） in the range of 1.0 × 10^-6 - 1.0 × 10 ^-3 mol/L, the regression equation is Ipa = 3. 614 93 ＋ 0. 126 45c （ r = 0. 998 7, n = 15 ）, and the detection limit is 1. 60 ×10^-7 tool/L; The concentration of HQ in simulated wastewaters was determined using the modified electrode with 95.03% -104.01% of recovery rates.

关 键 词：对苯二酚 碳纳米管 二氧化钛 化学修饰电极 分析方法 

分 类 号：O657[理学—分析化学]