Carboxyl Multiwalled Carbon Nanotubes through Ultrasonic Dispersing in Dimethylfomamide Modified Electrode as a Sensitive Amperometric Sensor for Detection of Sulfonamide

摘要

A modified glassy carbon electrode (GCE) was fabricated by coated with a layer of carboxylmultiwalled carbon nanotubes (MWCNTs) treated with ultrasonic dispersing in dimethylfomamide(DMF) media. The modified electrode showed excellent electrochemical catalytic properties for theelectrical oxidation polymerization of sulfonamide. In the BR buffer system, the oxidation peak currentwas proportional to the concentration of sulfanilamide. Based on this, a sensitive method for detection-6 -4 of sulfonamide was established. The linear range was 1.010 ~1.010 mol/L of sulfonamide and the-7 linear correlation coefficient was 0.999. The detection limit was 5.010 mol/L and the recovery wasin the range of 95%~103%. Repeatability and stability of the modified electrode were also satisfied.