Application of carbon nanotubes and zwitterionic surfactant-modified acetylene black electrode for the determination of triclosan in household commodities

Abstract

A novel electrochemical sensor for the determination of triclosan (TCS) based on acetylene black (AB)/carbon nanotube (CNT)/cetyl sulphonyl betaine (SB16) was prepared. The composite AB/CNT/SB16 sensor was constructed using AB electrode with CNT and SB16 as sensitising materials. Sensor performance was evaluated by cyclic voltammetry, scanning electron microscopy and electrochemical impedance spectroscopy analyses. The linear equation was Ip(μA) = 19.16CTCS(μM) + 0.1319(R2 = 0.9823), and the linear range of the prepared method for the detection of TCS was from 0.01 μM to 2.0 μM with a detection limit of 6.18 nM. The sensor also displayed excellent selectivity, repeatability, and stability for TCS determination. Finally, the sensor was successfully used to detect TCS in real commodity samples, with a relative standard deviation from 0.56% to 2.32%, consistent with the results of high-performance liquid chromatography.