摘要
以Nafion（全氟化磺酸酯）为溶剂分散多壁碳纳米管（MWCNTs），利用MWCNTs良好的电化学性能及Nafion的富集和选择透过性特征制备了MWCNTs—Nafion修饰的玻碳电极。用扫描电子显微镜对MWCNTs—Nafion膜进行了形貌表征，研究了偏二甲肼（UDMH）在该修饰电极上的电化学行为。建立了微分脉冲伏安法测定UDMH含量的方法，并对修饰剂用量、支持电解质及其pH、富集时间、富集电位进行了优化。结果表明，MWCNTs—Nafion修饰的玻碳电极对UDMH有良好的富集特性和电催化活性。在最佳试验条件下，该方法的线性范围为1．3×10^-6～4．0×10^-5mol／L，检测限为2．2×10^-67mol／L。利用该方法测定了模拟水样中UDMH的含量，平均加标回收率为100．8％。
The multiwall carbon nanotubes （MWCNTs） were dispersed by using Nation （perfluorinated sulfonate） as solvent. The MWCNTs-Nafion modified glassy carbon electrodes were prepared by using the good electrochemical performance of the MWCNTs and the enrichment and selective permeability characteristics of Nation. The morpholo- gies of MWCNTs-Nafion films were characterized by using scanning electron microscopy, and the electrochemical behavior of unsymmetrical dimethylhydrazine （UDMH） on the modified electrodes was investigated. The differential pulse voltammetry method for determining UDMH content was established, the modifier amount, supporting electrolyte and its pH, enrichment time and enrichment potential were optimized. The results show that the MWCNTs-Nation modified glassy carbon electrode possesses good enrichment characteristic and electrocatalytic activity for UDMH. Under the optimal experimental conditions, the linear range of this method is 1.3×10^6-4.0×10^-5 mol/L, the detection limit is 2.2×10^-7 mol/L. The UDMH content in the simulated water sample was determined by using this method, the average standard addition recovery rate is 100.8%.
出处
《化学推进剂与高分子材料》
CAS
2018年第1期81-87,共7页
Chemical Propellants & Polymeric Materials
关键词
多壁碳纳米管
NAFION
偏二甲肼
循环伏安法
微分脉冲伏安法
multiwall carbon nanotube
Nation
unsymmetrical dimethylhydrazine
cyclic voltammetry
differential pulse voltammetry
