Síntese de sodalita para adsorção utilizando como fonte de calor a variação de entalpia de dissolução dos reagentes

Abstract

Zeolites are ceramic materials formed by four oxygen atoms enclosing a cation, rearranged in interconnected tetrahedra and presenting channels and "cages" as a framework of open cavities, normally occupied by water molecules and extra-structural cations capable of ion exchange. The objective of this work was to synthesize sodalite zeolite from filler kaolin (CE) with the use of heating mantle and / or heat dissolution of sodium hydroxide and sodium silicate, as well as to evaluate the energy cost of zeolite synthesis Only with heat of dissolution and thus to elaborate through the material synthesized pellets of varied composition of sodalite, and other materials like treated clay, charcoal and hair in order to study the effect on the efficiency in the adsorption of water vapor and copper ion . The zeolite used for the conformation of the pellets was synthesized using calcined filler kaolin at 600 ° C, sodium hydroxide and silicate and distilled water. The zeolitic products as well as the starting materials were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Thermal Analysis (DSC, DTG, TG). From the reaction conditions studied it was possible to obtain zeolitic material in the short time 3, 6, 9, 12, 15 min using dissolution heat and 30 and 60 min using dissolution heat and heating mantle. Through the zeolitic material obtained, as well as its pellets, water vapor adsorption tests were carried out in systems with and without moisture control, as well as copper ion adsorption in which the final concentration was measured in Uv-1800 model spectrophotometer. The results showed that the adsorption of water vapor with and without moisture control applying pulverized sodalite and pellets had statistically similar values. The adsorption of the copper ion had a good efficiency when compared to other studies available in the literature.