多壁碳纳米管(MWNTs)在质量分数为36%的HCl中超声纯化后于2.2 mol/L的HNO3中超声氧化处理.处理好的MWNTs分散于N,N-二甲基甲酰胺(DMF)后滴加在玻碳电极表面制得MWNTs修饰电极(MWNTs/GCE),此电极对抗坏血酸(AA)有显著电催化氧化作用.在pH=4.0的B-R缓冲溶液中首次得到AA有2个分离良好的氧化峰,其电位分别在0.187和0.452 V(vs.SCE).根据AA分子与表面羧基化的MWNTs相结合后的电子传递性质对AA的2个氧化峰进行了初步解释.AA在MWNTs/GCE上的氧化为吸附控制的不可逆过程,其在电极表面的吸附量为1.02×10-9 mol/cm 2,2个氧化峰的电极反应标准速率常数分别为1.03×10-2和3.94×10-3 s-1.应用MWNTs/GCE对AA的电催化氧化性质以微分脉冲伏安法对AA进行测定,在最佳实验条件下其线性范围为5.0×10-7～5.0×10-2 mol/L,检测限为5.0×10-8 mol/L(S/N=3).
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