Acid-leached mixed vermiculites obtained by treatment with nitric acid
作者： S.S.G. Santos , H.R.M. Silva , A.G. de Souza , A.P.M. Alves , E.C. da Silva Filho
DOI: 10.1016/J.CLAY.2014.12.008
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摘要: Abstract Two samples of pristine vermiculites (V and V*) were reacted with nitric acid under controlled conditions. Structural textural studies performed using chemical composition, X-ray diffraction (XRD), 29 Si 27 Al NMR, adsorption/desorption gaseous nitrogen measurements, SEM TEM. Acid-activation increased the specific surface area porosity led to partial leaching iron, aluminum magnesium from octahedral sheets. Acid two vermiculite 3 4 mol L − 1 HNO at 80 °C for 4 h nearly removed all MgO, 2 O Fe , left behind SiO -containing residue. The elements easily extracted both dissolution rate decreased in order Mg 2 + > Al 3 + > Fe . XRD showed formation products low crystallinity treated high concentrations.
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