姜黄素-碳纳米管-离子液体修饰电极对盐酸羟胺电催化氧化性能研究

Electrocatalytic Oxidation of Hydroxylamine Hydrochloride at a Curcumin-Carbon Nanotubes-Ionic Liquid Composites Modified Electrode

以N-辛基吡啶六氟磷酸盐离子液体为分散剂,制备羧基碳纳米管-离子液体均匀分散体系,制备碳纳米管修饰电极。并通过电化学沉积,制备得到姜黄素-碳纳米管-离子液体修饰电极。修饰电极的电化学性能研究表明,该电极具有较低的背景电流响应,对盐酸羟胺具有明显的电化学催化氧化作用。阳极电位为0.25 V时,盐酸羟胺在修饰电极上氧化电流显著增大,在5.0～455μmol/L浓度范围内,氧化电流和盐酸羟胺浓度呈线性响应。

N-octyl-pyridinium-hexafluorophosphate ionic liquid was chosen as the dispersing agent for carboxyl carbon nanotubes to produce carbon nanotubes modified electrodes. Cureumin was used as the eleetrocatalytic media which was deposited onto the carbon nanotubes modified electrode by successive cyclic vohammetric scanning to form a new curcumin-carbon nanotubes-ionie liquid modified electrode. Electrochemical characterization indicated that the new modified electrode held the characteristics of higher current responses and lower backgrounds than that of a glassy carbon electrode or a normal carbon nanotubes modified electrode. The new modified electrode exhibited strong electroeatalytic ability to the oxidation of hydroxylamine hydroehloride with a low oxidation overpotential （0.25 V）. The oxidation peak currents of hydroxylamine hydrochloride obtained on the new modified electrode were proportional to the concentration of hydroxylamine hydroehloride within the range of 5.0-455μmol/L.