Preparation and characterization of organoclays synthesized from Thanh Hoa bentonite and demethyl dioctadecyl ammonium chloride.

Abstract

In this study, organoclays were synthesized by placing dimethyl dioctadecyl ammonium (DMDODA) cation onto bentonites.  The structure of modified bentonites was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), chemical analysis, thermal analysis and FT-IR spectra. The intercalation of the DMDODA cation increased the interlamellar distances from 15.6Å (Na-bentonites) to 40.57Å. The effect of temperature, pH, time and amount of quaternary ammonium salt on the distance layer of organoclays was addressed.