单壁碳纳米角/磷钼酸修饰电极对亚硝酸根的测定

Single Walled Carbon Nanohorns/Phosphomolybdic Acid-based Modified Electrode for Determination of Nitrite

通过电聚合法制备了单壁碳纳米角/磷钼酸修饰电极,采用计时电流法表征所制备电极的电化学性能。研究表明,该传感器对亚硝酸根(NO_2^-)表现出了良好的电催化作用,在1.0×10^(-5)1.9×10^(-3)mol·L^(-1)的范围内,电流与浓度呈现良好的线性关系,检出限为1.1×10^(-6)mol·L^(-1)(S/N=3)。该传感器具有良好的选择性,对AA、尿酸(UA)和DA无响应。

A novel single walled carbon nanohorns/phosphomolybdic acid based sensor was successfully fabricated by electropolymerization of phosphomolybdic acid at single walled carbon nanohorns modified glassy carbon electrode and studied by chronoamperometry. The modified electrode showed excellent electrocatalytic activity towards NO2 and exhibited linear amperometric response for NO2- in the concentration range of 1.0 × 10-5 - 1.9 × 10-3 mol· L-1. The detection limit was calculated as 1.1 ×10-6 mol · L-1（ S/N = 3 ）. The as prepared modified electrode was highly selective to NO~ and showed no reponse to AA, uric acid （UA） and DA.