Produção Nacional
Revisado por pares
Intercalation of Benzamide into Kaolinite
2000; Elsevier BV; Volume: 221; Issue: 2 Linguagem: Inglês
10.1006/jcis.1999.6581
ISSN1095-7103
AutoresJosé Eduardo Ferreira da Costa Gardolinski, Luiz Pereira Ramos, Gabriel Pinto de Souza, Fernando Wypych,
Tópico(s)Geological and Geochemical Analysis
ResumoWell-crystallized kaolinite (K) was initially reacted at 60°C with a water/dimethylsulfoxide (DMSO) mixture and the resulting intercalation derivative (K-DMSO) was characterized by powder X-ray diffractometry (PXRD), thermal analysis (simultaneous TG and DSC), and Fourier-transformed infrared spectroscopy (FTIR). Benzamide crystals were then melted with the K-DMSO derivative at 140°C for 4 days, when a gradual displacement of DMSO by benzamide was observed within the interlayer spacing of the modified kaolinite. The resulting material, after extensive washing with acetone, was characterized and compared to the results obtained previously for the K-DMSO composite. Benzamide intercalation proceeded by gradual displacement of DMSO molecules until completion. The structural stabilization of the K-BZ derivative was explained through the establishment of hydrogen bonds between the carbonyl oxygen atoms of the intercalated benzamide and aluminol groups present at the surface of the kaolinite layer. The interlamellar spacing of K-BZ was shown to be possibly occupied by benzamide molecules that were located at a 68° orientation in relation to the layer surface. Unlike most intercalation molecules such as DMSO, variations in the interplanar spacing of kaolinite were consistent with the nonkeying of any other part of the molecule between the aluminosilicate interlayers.
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