An ordered mesoporous carbon modified electrochemical sensor for solid-phase microextraction and determination of triclosan in environmental samples

Abstract

A simple and sensitive electrochemical sensor was performed with an ordered mesoporous carbon modified screen-printed carbon electrode (SPCE) to detect triclosan (TCS) in river water samples. A nanostructured mesoporous carbon CMK-3 type was successfully obtained from ordered mesoporous silica SBA-15 type used as hard-templated and sucrose as carbon precursor. Due to its high specific surface area (1125 m2 g-1), large pore volume (1.16 cm3 g-1), uniform mesostructure (4.4 nm), good conductivity and excellent electrochemical activity, this porous carbon material provides selectivity and sensitivity for the electrochemical determination. CMK-3 was immobilized onto a SPCE using chitosan (CH) as a binder. CMK-3/CH/SPCE was characterized by cyclic voltammetry, transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive spectrometry and N2 adsorption-desorption isotherms. CMK-3/CH was used for solid-phase microextraction, since it has an excellent extraction selectivity towards organic aromatic compounds. The electrochemical behavior of TCS showed an irreversible oxidation peak measured by square wave voltammetry. The detection limit of this electrochemical sensor was 0.24 ng mL-1 with a wide linear range from 0.8 ng mL-1 to 40 ng mL-1, the intra- and inter-assay coefficients of variation were below 4%. This electrochemical platform offered a useful tool for on-site TCS determination in environmental samples.