A Novel Catechol Electrochemical Sensor Based on Cobalt Hexacyanoferrate/ (CoHCF)/Au/SBA-15

Abstract

A novel electrochemical sensor for catechol was developed by electrodepositing HAuCl 4 and cobalt hexacyanoferrate (CoHCF) on an ordered mesoporous SBA-15 decorated glassy carbon electrode (GCE). The CoHCF/Au/SBA-15 film was characterized by scanning electron microscopy (SEM) and impedance spectra. A mesoporous SBA-15 was used as a platform that enlarged the surface area of the working electrode. The CoHCF/ Au/SBA-15 modified electrode showed good electrocatalytic activity to catechol and the electrocatalytic response was measured using cyclic voltammetry and Amperometric i-t curve. The electrochemical performance of the sensor for catechol was further enhanced due to the deposition of Au on the electrode surface. Under the optimal conditions, the sensor showed a linear range from 3.0 × 10 -7 M to 5.1 × 10 -5 M of catechol, with a detection limit of 50 nM (S/N=3). Good reproducibility, stability and good selectivity in the presence of numerous organic phenolics made the CoHCF/ Au/SBA-15 modified electrodes applicable to the determination of catechol in the various water samples.

Multicomponent Template Effects—Preparation of Highly Porous Polyaniline Nanorods Using Crude Lemon Juice and Its Application for Selective Detection of Catechol

“…Catechol sensors have been fabricated using many other materials, such as goldnanoparticle/cobalt hexacyanoferrate/SBA-15, poly­(aniline- co -o-aminophenol), poly­( N -vinylpyrrolidone), PANI/polyacrylonitrile, silicon/tyrosinase, Fe 3 O 4 /PANI/chitosan, Fe 3 O 4 –SiO 2 , MWCNTs/MnO 2 , agarose–guar gum, graphene oxide/multiwalled carbon nanotubes/terthiophene, poly­(malachite green)/MWCNTs, molecularly imprinted polymers, PANI/ionic liquid, and DNA/graphene oxide. − The performance of the proposed sensor was compared with some other reported polyaniline-based catechol sensors, as summarized in Table .…”

“…Its exposure may cause many metabolic disorders, e.g., Atherosclerosis, Parkinson’s, Alzheimer’s, Diarrhea, depression of the central nervous system, and gastrointestinal, respiratory, and cardiovascular problems. Enzymatic and nonenzymatic detection of catechol has been reported by many researchers. − …”