羧化单壁碳纳米管/二茂铁/离子液体复合电极对叶酸的电催化研究

摘要

通过将1-正丁基-3-甲基咪唑六氟磷酸盐([BMIm] PF6)、羧化单壁碳纳米管以及二茂铁混合物滴涂于玻碳电极表面得到修饰电极,并以循环伏安法研究了该电极在不同条件下对叶酸的电催化行为.实验结果表明,在pH =6.8的磷酸盐缓冲溶液中,该修饰电极在叶酸浓度范围1.00 × 10-7～6.0×10-5 mol/L内与其氧化峰电流呈良好的线性关系,氧化峰电流与浓度线性相关系数R =0.996 2,检出限为8.6×10-8 mol/L,回收率为97.47％～ 101.26％.测定样品效果良好.%Room temperature ionic liquid l-butyl-3-methyl imidazolium hexafluorophosphate ( [BMIm]PF6) -car-boxylic single-walled carbon nanotubes-ferrocene modified glassy carbon electrode was prepared using drop coating method. The electrochemical behaviors of modified electrode for determination of folic acid ( FA) at different conditions were explored. The results showed that in pH =6. 8 phosphate buffer solution (PBS) , a good linear relation between concerntration of folic acid and oxidation peak current (R =0. 996 2) was indicated in the range of l.00×lO-7 ~6.0×10-5 mol/L. The detection limit and recovery of folic acid is 8. 6 × 10-8 mol/L and 97.47% ~ 101. 26% , respectively. Furthermore, the results of determination of sample of folic acid are good.