Constructed ILs@ hollow porous spherical Ni-loaded CdFe2O4 modified electrode for highly sensitive simultaneous electrochemical analysis of bisphenols

Ionic liquids (ILs) coated hierarchically hollow porous spherical Ni-loaded CdFe2O4 (ILs@HPS-Ni/CdFe2O4) hybrid was designed as an enhanced sensing material for ultra-sensitive electrochemical simultaneous determination of endocrine-disrupting compounds (EDCs) bisphenol S (BPS) and bisphenol AP (BPAP). The electrocatalytic and electroanalytical properties of BPS and BPAP on the modified electrode were investigated by differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). After loading Ni, three-dimensional (3D) HPS-Ni/CdFe2O4 showed the higher electrocatalytic performance for the oxidation of BPS and BPAP. By the synergistic effect of IBMIMI[PF6] ILs, the electrochemical sensor film (ILs@HPS-Ni/CdFe2O4) not only further provided a greater electrochemically active surface area and facilitated electron transfer, but also exhibited a good anti-fouling ability. The simultaneous determination of BPS and BPAP was successfully carried out in the phosphate buffer solution (PBS) of pH 6.0, and the detection limits (S/N = 3) for BPS and BPAP were 5.37 x 10(-9) mol L-1 and 4.55 x 10(-9) mol respectively. The sensor showed high sensitivity, well reproducibility and anti jamming ability, and this study provided a potential candidate for electrochemical detection of EDCs individually or simultaneously in the environmental samples. (C) 2017 Elsevier B.V. All rights reserved.