Zinc/Aluminium–Quinclorac Layered Nanocomposite Modified Multi-Walled Carbon Nanotube Paste Electrode for Electrochemical Determination of Bisphenol A

This paper presents the application of zinc/aluminium-layered double hydroxide-quinclorac
(Zn/Al-LDH-QC) as a modifier of multiwalled carbon nanotubes (MWCNT) paste electrode for the
determination of bisphenol A (BPA). The Zn/Al-LDH-QC/MWCNT morphology was examined bya
transmission electron microscope and a scanning electron microscope. Electrochemical impedance
spectroscopy was utilized to investigate the electrode interfacial properties. The electrochemical
responses of the modified electrode towards BPA were thoroughly evaluated by using square-wave
voltammetry technique. The electrode demonstrated three linear plots of BPA concentrations from
3.0
10 8–7.0 10 7 M(R2 =0.9876), 1.0 10 6–1.0 10 5 M(R2 =0.9836)and3.0 10 5–3.0
10 4 M(R2 =0.9827)withalimit of detection of 4.4 10 9 M.Theelectrode also demonstrated good
reproducibility and stability up to one month. The presence of several metal ions and organic did not
affect the electrochemical response of BPA. The electrode is also applicable for BPA determination in
baby bottle and mineral water samples with a range of recovery between 98.22% and 101.02%