Intercalation of Kaolinite from the Rio Capim-PA-Brazil with Dimethyl Sulfoxide under Hydrothermal Conditions

Reference	Presenter	Authors (Institution)	Abstract
16-038	Francisco Rolando Valenzuela-Diaz	Neves, R.F.(Federal University of Pará); Carvalho, T.C.(Escola Politécnica da Universidade de São Paulo); Silva Valenzuela, M.d.(Escola Politecnica da Universidade de Sao Paulo); Angélica, R.S.(Universidade Federal do Pará); Valenzuela-Diaz, F.R.(Polytechnic School of the University of São Paulo);	Kaolinite is a phyllosilicate of 1:1 type whit lamellar structure whose unit cell neutral formula is Al4Si4O10 (OH)4, consisting of a sheet of SiO4 tetrahedra and octahedra of Al2(OH)4, united by common oxygens. Kaolinite presents lamellar pseudo hexagonal morphology with two of its dimensions of micrometer (< 2 or 4?m) order, and submicrometric thickness order. For the purpose of obtaining nanometric kaolinite particles, several papers with dimethyl sulfoxide as intercalating agent have already been developed, but the kinetics of the reaction of intercalation was little researched. This work presents a simple intercalation methodology of DMSO in kaolinite with focus in the kinetics of the process, using intercalation quantification of by x-ray diffraction. The procedures were performed in autoclaves, without stirring, at temperatures of 100oC, 125oC 150oC. X-ray patterns of kaolinite and kaolinite-DMSO complexes, formed at different temperatures and times, conversion percentage curves and, particle size, FTIR, TG, TEM and SEM analysis are presented. It was achieved 90% conversion at temperatures of 100oC, 125oC, and 150oC for 120 minutes, 60 minutes and 20 minutes of reaction times respectively.
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