Fabrication of water-compatible molecularly imprinted polymer based on β-cyclodextrin modified magnetic chitosan and its application for selective removal of bisphenol A from aqueous solution

Beta-cyclodextrin modified magnetic chitosan molecularly imprinted polymer (MMIP) was successfully synthesized via covalent modification and self-assembly polymerization for selective removal of bisphenol A (BPA) from wastewater. To obtain more water-compatible imprinting sites, chitosan and betacyclodextrin were introduced as functional monomer of polymerization process. The provided multifunctional ligand containing-NH2, -OH and hydrophobic cavity enhanced the capture capability toward target molecule. The as-prepared MMIP was evaluated and characterized by scanning electron microscopy, Fourier transform infrared analysis, x-ray diffraction and vibrating sample magnetometry. Pseudo-second order kinetic and Langmuir isotherm mode fitted the experimental data better than other models. The optimal adsorption was observed at pH = 6 with the highest binding capacity of 105.5 mg/g at 298 K. The initial adsorption rate of MMIP was 7.062 mg/g min, and adsorption equilibrium was reached in less than 60 min. Moreover, MMIP showed significantly selective binding capacity to BPA over other structurally related phenolic compounds. Regenerative study demonstrated that no obvious decline of removal capacity was observed after several cycles. Therefore, MMIP could be expected to be a promising candidate for selective removal of target pollutant from aqueous solution. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.