Monitoring endocrine-disrupting chemicals such as bisphenol-A
(BPA)
is of great concern because its exposure may lead to reproductive
problems, neurotoxicity, mutagenicity, and even carcinogenicity. Herein,
we reported the fabrication of an efficient electrochemical sensor
based on CuO–NiO wrapped cellulose acetate/polyaniline electrospun
nanofibers at a Ni foam (CuO–NiO/CA–PANI@NF) electrode
for the sensitive and selective monitoring of BPA. CA–PANI-based
electrospun nanofibers were selected because of their improved electrical
conductivity and charge density, high binding affinity toward BPA
via alternative amine and imine groups, and low cost, thus paving
the way for the smooth and uniform flow of ions. However, CuO–NiO-based
nanoparticles offer more exposed catalytic active species such as
NiOOH/CuOOH for the fast electrocatalytic oxidation of BPA. Thus,
the synergistic effect of CuO–NiO nanoparticles with electrospun
nanofibers leads to high sensitivity (0.00172 μA/nM/cm2) with a low limit of detection (0.6 nM), a wide linear range (2–100
nM), and high selectivity, even in the presence of interferences,
including Co2+, Cd2+, Na+ Pb2+, Ni2+, Cd2+, Ca2+, Fe3+, NO3
2–, SO4
2–, Cr6+, Br–, Mg2+, Zn2+, and Ba2+ and molecules such as bisphenol-B,
bisphenol-F, and phenol. The designed electrode was successfully applied
to monitor BPA from plastic bottled water with high precision, thus
suggesting the reliability of our designed system.
