Acid matrix production from treated natural vermiculite-hydrobiotite

Given the potential of acid-activated clays in adsorptive and catalytic processes, several studies focusing on acid matrices have grown over years, making it possible to study vermiculite, a mineral composed type 2:1 unit cell with tetrahedral octahedral sheets. Therefore, this work aimed vermiculite treated acids for production matrices. In work, treatment natural vermiculite-hydrobiotite, nitric concentrations 0.25, 0.50, 0.75, 1 mol.L-1, followed by dealumination process sulfuric 25% v/v, aiming applications as support biocatalysts, chemical adsorbents, among others. The produced materials were characterized using different techniques, including X-ray fluorescence spectroscopy, diffraction, scanning electron microscopy, Fourier transform infrared thermogravimetric analysis, isotherm adsorption BET method. results showed that after leaching high SiO2 content, Brønsted Lewis surface acidity, good adsorption/desorption performance, significant growth specific area, qualifying promising material future biocatalytic processes. concentration had considerable influence compositional textural modification vermiculite-hydrobiotite.