对乙酰氨基酚在纳米金/十二烷基苯磺酸钠修饰电极上的电化学行为研究

摘要

基于电化学沉积法制备了纳米金/十二烷基苯磺酸钠修饰玻碳电极(Nano-Au/SDBS/GCE),并采用扫描电子显微镜、X-射线光电子能谱和电化学方法进行表征.研究了对乙酰氨基酚在Nano-Au/SDBS/GCE上的伏安行为,结果表明,对乙酰氨基酚由在裸玻碳电极上的不可逆氧化过程变为准可逆过程,氧化峰峰电位由0.60V负移至0.50 V,且在0.42 V处产生一个新的还原峰,表明nano-Au/SDBS膜能催化对乙酰氨基酚的电化学反应.在优化条件下,氧化峰峰电流与对乙酰氨基酚浓度在1.0 ×10-6 mol/L ～9.0 ×10-6 mol·L-1和1.0×10-5 ～1.0×10-4 mol - L-1间有良好的线性关系,检出限为8.0 ×10-7 mol·L-1(S/N=3).%Gold nanoparticles/sodium dodecylbenzene sulfonate modified glassy carbon electrode( nano-Au/SDBS/GCE) was fabricated with electrochemical technique. The obtained nano-Au/SDBS/GCE were characterized with transmission electronic microscopy (TEM) , X-ray Photoelectron Spectroscopy( XPS) and electrochemical techniques. Electrochemical behaviors of p-acetamidophenol at the nano-Au/SDBS/GCE were investigated. Compared to voltammetric behaviors of p-acetamidophenol at the bare glassy carbon electrode,the reversibility for the electrochemical reaction of p-acetamidophenol at the nano-Au/SDBS/GCE was improved due to a quasi-reversible process occurred rather than an irreversible process. The oxidation peak potential negatively shifted from 0.60 V to 0. 50V with the peak current significant increasing,and a new reduction peak was observed at 0.42 V. All results indicate that nano-Au/SDBS film can catalyze the electrochemical reaction of p-acetamidophenoL Under optimal conditions,the oxidation peak current was proportional to the p-acetamidophenol concentration in the range of 1. 0× 10-6 ~ 9.0 × 10-6 mol · L-1 and 1. 0× 10-1 ~ 1.0 × 10℃ mol · L-1. The estimated detection limit was 8. 0 ×l0-7mol · L-1(S/N=3).