Highly sensitive and selective amperometric determination of BPA on carbon black/f-MWCNT composite modified GCE

Abstract A novel electrochemical sensing platform for the determination of bisphenol A (BPA) was constructed on a glassy carbon electrode adapted by employing carboxylic acid functionalized carbon black-multi-walled carbon nanotubes (CB/f-MWCNTs). The morphology of CB/f-MWCNTs composite was described by examining scanning electron microscopy (SEM), X-ray powder diffraction (XRD), high-resolution transmission microscopy (HR-TEM) and laser Raman spectra. The developed electrode was examined for the electrochemical oxidation of BPA using cyclic voltammetry (CV) and amperometric techniques in which, CB/f-MWCNTs composite was demonstrated to be highly sensitive and selective detection of towards BPA. Contrasted with a bare GCE electrode, the CB/f-MWCNTs electrode showed an increase of peak current of about 260 μA on the electro-oxidation of BPA. The instant detection of BPA was refined with amperometry under streamlined conditions. CB/f-MWCNTs composite modified GC electrode revealed an excellent sensitivity within the concentration varying from 0.1 to 130 μM with a lower detection limit of 0.08 μmol L −1  (S/N = 3, R 2 : 0.998). The projected strategy was effectively to utilise the recognition of BPA real samples (plastic drinking water bottles) with acceptable results and great recuperation.