Novel insights on magadiite disaggregation: a multitechnique study on thermal stability

Abstract

Disaggregated magadiite was obtained through ion-exchange in acidic media from magadiite intercalated in the synthesis with cetyltrimethylamonium cations. The combination of Soxhlet extraction and ultrasound during the procedure resulted in different morphology and different properties when compared with the pristine material, as observed by SEM. Thermal and surface properties studies performed by VT-XRD, TG, VT-FTIR, HETCOR SS-NMR, and N₂ physisorption show that disaggregated magadiite presents a basal space of 1.35 nm and that [SiO₄] entities of adjacent magadiite silicate layers connect during ion-exchange under ultrasound. Despite these bonding events, the surface area increased from 20–26 m² g⁻¹ in CTA-magadiite to 55–72 m² g⁻¹ in disaggregated magadiite.