Híbridos da montmorillonita-KSF contendo grupos alquiamina - Sintese, caracterização e aplicações adsortivas

Abstract

The sodium montmorillonite-KSF (KSF-Na+) was organically modified by intercalation reactions, ion exchange and silanization using amines and amino silanes. The solids were characterized by various techniques of X-ray diffraction, infrared spectroscopy, elemental analysis (CHN), thermogravimetry, scanning electron microscopy and nuclear magnetic resonance of 29Si and 13C. The solid chlorinated indicated the immobilization of 0.97 mmolg-1 of chlorine in the matrix KSF-Na+. The reaction of the solid precursor and chlorinated with diamines in aqueous solution and without solvent was more efficient with the molecule of ethylenediamine. Substrates containing a silanized aminosilanos with two nitrogens indicated 1.47 and 1.13 mmolg-1 groups immobilized on the matrix KSF-Na+, respectively. For reactions with increasing chain diamines (H2N ((CH2) nNH2) where n = 8, 9, 10 and 12) it was realized that nonildiamina showed better incorporation into the matrix KSF-Na+. The synthesis of solid dodecylamine saw the entry of a 2,12 mmolg-1 of organic groups, and the matrix applied to the retention of copper ions (II) with values of 115.0, 80.06, 71.16 and 62.26 mg g-1 at 303, 308, 313 and 318 K, respectively. For diamines (H2N ((CH2) nNH2) where n = 8, 9, 10 and 12) there was protonated by the set of characterizations the effectiveness of the reactions. The solid containing protonated dodecylamine (KSF-C12N+) was applied to the adsorption of the dye Remazol Brilliant Blue R 303, 313 and 323 K, other words, the adsorptive process followed the pseudo second order model. The maximum retention capacities were 27.28, 28.84 and 31.87 mg/g at temperatures of 303, 313 and 323 K, respectively, and the process is adjusted to the Langmuir model.