Preparation and characterization of hybrid materials consisting of high-energy ground montmorillonite and α-amino acids

Two amino acids (L-cysteine and L-glutamic acid) were adsorbed on high-energy ground montmorillonite to prepare novel hybrid materials. The present minerals were analysed by X-ray diffraction (XRD) and C content was obtained. The amount of adsorbed glutamic acid was negligible in comparison to samples prepared by addition of cysteine. XRD assay showed the presence of cystine formed by oxidation of cysteine catalyzed probably by Fe(III) from the montmorillonite layers. Hybrid materials consisting of clay minerals and amino acids are promising biodegradable and nontoxic materials. (C) 2015 Elsevier B.V. All rights reserved.