Investigations on Microstructural and Layer Disorder Parameters of Na-Montmorillonite-Glycine Intercalation Compounds

Abstract

Glycine-Montmorillonite (Gly-MMT) composite has been synthesized through intercalation process using Na-Montmorillonite (Na-MMT) and glycine ethylester hydrochloride. Gly-MMT was employed for the synthesis of dipeptide (Gly-Gly-MMT). Microstructural parameters such as crystallite size, r.m.s. strain (<e 2 > 1/2 ) and layer disorder parameters such as variation of interlayer spacing (g) and proportion of planes affected by such defects (γ) of the samples have been calculated by X-ray line profile analysis. In comparison to Na-MMT the basal spacings (d001) of Gly-MMT and Gly-Gly-MMT were reduced by 2.4Å and 1.8Å respectively. The value of d001 of Gly-Gly-MMT (13.3 Å) suggests the monolayer orientation of dipeptide into interlayer spaces. It is also suggested that more homogeneity in the stacking of silicate layers is attained in Gly-Gly-MMT due to the increased chain length of the dipeptide and orientation in monolayer style.

Adsorption of paraquat and pirimiphos-methyl by montmorillonite modified with tetradecylammonium chloride and intragallery templating method

“…The decrease of the interlayer spacing indicated ion exchange between hydrated cations and paraquat dication. Similar behavior was also reported on ion exchange of hydrated Na + from Na-Mt by alkyl ammonium, glycine ethylester, and ethylenediammonium (Bala et al., 2000; Khan et al., 2009, 2012; Laura and Cloos, 1975). The XRD pattern of TDA-Mt–containing paraquat (TDA-Mt-PQ) shows the main peak at 7.0° corresponding to the interlayer spacing 1.27 nm.…”