ENSAIOS DE ADSORÇÃO DE CO2 DE ARGILAS FUNCIONALIZADAS COM AMINA

Abstract

Given the growing concern over the increasing concentration of carbon dioxide (CO₂) in the atmosphere, this study evaluated the potential of natural clays (kaolinite and bentonite PMT3) and their modified forms impregnated with 15% diethylenetriamine (DETA) for CO₂ adsorption. The samples were characterized using X-ray diffraction (XRD), Fouriertransform infrared spectroscopy (FTIR), thermogravimetric and differential thermal analysis (TGA/DTA), and X-ray fluorescence (XRF), aiming to understand the structural, thermal, and chemical changes induced by functionalization. XRD and FTIR analyses confirmed reductions in crystallinity and the successful incorporation of amine groups. Thermal analysis revealed additional decomposition events attributed to amine (DETA), while XRF showed mineralogical differences between the clays. CO₂ adsorption experiments demonstrated a significant increase in adsorption capacity for the functionalized materials, with the modified bentonite achieving the highest performance (25.2 mg of CO₂ per g of adsorbent). The results indicate that amine functionalization enhances the adsorptive properties of clays, making them promising materials for application in carbon capture technologies.