Adsorption and removal of bisphenol A, α-naphthol and β-naphthol from aqueous solution by Fe3O4@polyaniline core-shell nanomaterials

In present study, functional material, polyaniline coated Fe3O4 (Fe3O4@PANI), was synthesized using a simple two-step polymerization method, which was characterized by transmission electron microscopy (TEM), scanning electron microscope(SEM), FT-IR, X-ray diffraction(XRD), etc. Due to its structure, it would have strong affinities to the organics containing benzene ring because of pi-pi interactions and electrostatic interaction. This material was investigated to remove bisphenol A (BPA), alpha-naphthol and beta-naphthol from water samples. The adsorption capacity (q(max)) of the core-shell materials for bisphenol A (BPA), alpha-naphthol and beta-naphthol was 23.0947, 28.7356, 9.1324 mg/g at 298 K, respectively. The kinetics results indicated that the adsorption process fit the pseudo-second-order kinetic model. The thermodynamic parameters Delta G for BPA, alpha-naphthol and beta-naphthol were negative, suggesting that the adsorption reaction was spontaneous and endothermic in nature. The experimental results demonstrated that Fe3O4@PANI core-shell composites had great potential prospect for removing BPA, alpha-naphthol and beta-naphthol from environmental water in the future. (C) 2015 Elsevier B.V. All rights reserved.