Hydrothermal synthesis of sodalite from a kaolin waste by alkali fusion treatment

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Abstract
13-050 Amanda Maria Vieira Vieira, A.M.(Universidade Federal do Oeste do Pará); FIGUEIRA, B.A.(Universidade Federal do Oeste do Pará); SANTOS, M.P.(Universidade Federal do Oeste do Pará); Vasconcelos, A.A.(Universidade Federal do Oeste do Pará); da Luz, P.T.(Instituto Federal do Pará); Maia, A.A.(Universidade Federal do Pará); In this investigation, sodalite nanoparticles has been prepared from kaolin processing waste (without metakaolinization) by alkali fusion, using NaOH and hydrothermal synthesis at 90 ºC. The effects of time and temperature on crystallinity have been studied. The diffraction pattern displayed intense characteristic peaks at 14.42, 24.85, 28.73, 32.05, 35.30, 43.51 and 58.89º (2q), which correspond to the (110), (211), (220), (310), (222), (411) and (440) planes of cubic sodalite, respectively, with cell parameters of a = 8.823 Å and Volume = 694.54 Å and crystallite size (Scherrer Equation) around 30 nm, which agreed with the values described in the literature. FTIR spectrum of sodalite showed bands at 3426 and 1600 cm-1 related to the presence of hydroxyls and water molecules in the sodalite cages. The bands at 977, 710, 664, 585 and 465 cm-1 could be ascribed to the T-O (Si, Al) stretching vibrations. An XRD study monitoring the structural evolution on heat-treated sodalite revealed that the structure was maintained up 750ºC, despite the cell parameters have presented an important change.
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