Polymerization of -cyclodextrin in the presence of bentonite clay to produce polymer nanocomposites for removal of heavy metals from drinking water

New hybrid organic-inorganic nanocomposites consist of -cyclodextrin (-CD)/epichlorohydrin (ECH), and bentonite clay were prepared by direct intercalation through one step emulsion polymerization. The structure and thermal stability of prepared nanocomposites were investigated by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), differential of differential scanning calorimetry (DDSC), thermogravimetric analysis (TGA) and differential thermogravimetric (DTG) analyses. The observed results show that the -CD polymer/clay nanocomposites (-CD-ECH polymer/clay) with higher thermal stability than -CD-ECH polymer were successfully prepared. The removal of heavy metals such as Cu(II), Zn(II) and Co(II) ions from drinking water was studied using a batch method at ambient temperature. The removal percentage and distribution coefficients (Kd) were determined for the adsorption system. It was found that the -CD-ECH polymer/clay nanocomposites showed higher removal capacity for Co2+, Cu2+ and Zn2+ ions in comparison with -CD-ECH polymer. The selectivity order could be given as Zn2+>Cu2+>Co2+. Copyright (c) 2016 John Wiley & Sons, Ltd.