International Journal of Molecular Sciences, Vol.15, No.4, 6111-6136, 2014
Molecular Imprinted Polymer of Methacrylic Acid Functionalised beta-Cyclodextrin for Selective Removal of 2,4-Dichlorophenol
This work describes methacrylic acid functionalized beta-cyclodextrin (MAA-beta CD) as a novel functional monomer in the preparation of molecular imprinted polymer (MIP MAA-beta CD) for the selective removal of 2,4-dichlorophenol (2,4-DCP). The polymer was characterized using Fourier Transform Infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) and Field Emission Scanning Electron Microscopy (FESEM) techniques. The influence of parameters such as solution pH, contact time, temperature and initial concentrations towards removal of 2,4-DCP using MIP MAA-beta CD have been evaluated. The imprinted material shows fast kinetics and the optimum pH for removal of 2,4-DCP is pH 7. Compared with the corresponding non-imprinted polymer (NIP MAA-beta CD), the MIP MAA-beta CD exhibited higher adsorption capacity and outstanding selectivity towards 2,4-DCP. Freundlich isotherm best fitted the adsorption equilibrium data of MIP MAA-beta CD and the kinetics followed a pseudo-second-order model. The calculated thermodynamic parameters showed that adsorption of 2,4-DCP was spontaneous and exothermic under the examined conditions.