Investigação gravimétrica e eletroquímica de polímeros de coordenação com o ligante ácido 1,3,5 benzeno tricarboxílico (BTC) e materiais resultantes de adsorção com ácido sulfídrico

Abstract

The Metal Organic Frameworks, also called MOFs, are a new class of compounds that has gained importance in the scientific literature due the very better understanding of nanocomposites properties and the increase of opportunities for industrial used. In this thesis, results of experiments with MOFs prepared on basis of Fe, Cu Cd, Al, Pb and Zn as metallic nuclei and complexed with 1,3,5 benzene tricarboxylate (BTC). Analogic thermogravimetry experiments and cyclic voltammetry were performed under some specific conditions in order to evaluate the potential use of these MOFs type Metal-BTC for two purposes: energy storage (as adsorption of hydrogen sulfide) and indirect electrocatalysis (as homogeneous redox catalyst). The results of thermogravimetric study, based on mass loss of the material saturated with H2S. Voltammetric studies were carried out in three different systems: a) MOF immobilized on chitosan gel, b) use of paste microelectrode with mineral oil and activated carbon, c) use of a glassy carbon electrode with MOF dispersed in chloride-based electrolyte in presence and absence of Fe2+/3+. The MOFs voltammograms presented redox waves related to the signing of the MOF´s metallic nuclei, with particularly detach for compounds of Pb and Cd, whose behavior suggests potential use as homogeneous catalyst