Redes poliméricas de poli(dimetilsiloxano) funcionalizadas com grupo tiol ou sulfônico para adsorção de íons cádmio em solução etanólica

Abstract

Poly (dimethylsiloxane) (PDMS) networks functionalized with thiol or sulfonic groups have been prepared. The materials were characterized by Infrared Spectroscopy (IR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), X-Ray Diffraction (XRD) and 13C / 29Si Nuclear Magnetic Resonance (NMR). The results suggest that the materials were functionalized with above cited groups and the networks are constituted of linear segments of PDMS crosslinked by nodes of silsesquioxanes which contains T3 and/or T2 silicon types. The polymeric networks are in an amorphous state and with high thermal stability, when in an inert atmosphere. The potential of the materials to act as adsorbents for metal ions from ethanol solutions were studied by obtaining adsorption isotherms for Cd2+ ion. The material functionalized with the sulfonic group was the most efficient when compared to the thiol group. The total amount of cadmium adsorbed was 0.89 mmol g-1 and 0.33 mmol g-1, respectively. Evaluation of the linearized isotherms data shows that the model which better represents the interaction between the adsorbate-adsorbent for the prepared materials is the described by Langmuir.