Electrochemical Behavior of o-Nitrophenol at Hexagonal Mesoporous Silica Modified Carbon Paste Electrodes

摘要

A hexagonal mesoporous silica (HMS) modified carbon paste electrode (CPE) was fabricated and characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) methods (ferrocene as a probe). The electrochemical behavior of nitrophenol (o-NP) at the HMS modified electrode (HMSCPE) was investigated. Compared with CPE, a well-defined reduction peak and a remarkably peak current response was observed. It is indicated that mesoporous HMS exhibited remarkable enhancement effects on the electrochemical reduction of o-NP. The electrochemical reduction mechanism was also discussed. Consequently, a simple and sensitive electrochemical method was proposed for the determination of o-NP, which was used to determine o-NP in waste water samples.