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Chemical, sorptive and morphological properties of montmorillonite treated with ammonium bifluoride (NH4HF2) solutions

Published online by Cambridge University Press:  09 July 2018

J. Fijal ,
M. Zyla  and
M. Tokarz
J. Fijal
Affiliation:
University of Mining and Metallurgy, 30–059 Krakow, Al. Mickiewicza 30, Poland
M. Zyla
Affiliation:
University of Mining and Metallurgy, 30–059 Krakow, Al. Mickiewicza 30, Poland
M. Tokarz
Affiliation:
University of Mining and Metallurgy, 30–059 Krakow, Al. Mickiewicza 30, Poland
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Abstract

The fluorination of montmorillonite by aqueous ammonium bifluoride solution (NH4HF2) has been investigated by chemical, sorptive, porosimetric and electron microscopic methods. Changes in the chemical composition of the montmorillonite during the fluorination were compared both in the crystal surface and in the bulk sample. The accumulation of fluorine was distinctly zonal, being present mainly in the surface layers. The electron microscope studies showed that the 300–400 nm thick macrodomains in the initial montmorillonite were cracked into small microdomains 20–30 nm in thickness, this resulting from disruption in the continuity of the octahedral sheets. These distinct changes in morphology of the montmorillonite aggregates particularly influenced the porosity and sorptive properties.

Type
Research Article
Information
Clay Minerals , Volume 20 , Issue 1 , March 1985 , pp. 81 - 92
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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References

Barrer, R.M. & Jones, D.L. (1970) Chemistry of soil minerals. Part VIII. Synthesis and properties of fluorhectorites. J. Chem. Soc.A 1531-1537.Google Scholar
Bordeaux-Juglaret, D. & Roby, C. (1970) Synthese seche d'une smectite fluoree saturee au sodium. Bull. Soc.fr. Miner. Crist. 93, 449–469.Google Scholar
Bykov, W.T., Gerasimova, W.G. & Zalevski, N.J. (1960) Natural Mineral Sorbents. Publ. House Kiev, USRR (in Russian).Google Scholar
Campbell, A.S., Adams, J.A. & Hawarth, D.T. (1972) Some problems encountered in the identification of plumbogumite minerals in soils. Clay Miner. 9, 415–421.Google Scholar
Ciembroniewicz, A. & Lason, M. (1972) Sorptive manostats. Semi-automatic apparatus for sorptive studies. Rocz. Chem. 46, 703–708. (in Polish).Google Scholar
Dyrek, K., Klapyta, A. & Sojka, Z. (1983) Hydration state of Cu2+ in mixed Cu2+-hexadecylpyridinium montmorillonite by electron spin resonance. Clays Clay Miner. 31, 223–229.Google Scholar
Fijal, J., Klapyta, Z., Zietkiewicz, J. & Zyla, M. (1976) Studies on the fluoro-derivatives of layer silicates. II. The effect of fluoride solutions on structural and surface properties of montmorillonite. Miner. Polon. 7, 27–37.Google Scholar
Fijal, J. & Olkiewicz, S. (1982) Thermal stability of cross-linked montmorillonite obtained by the use of fluor-hydroxy-aluminum and hydroxy-aluminum comples. Miner. Polon. 13, 273–284.Google Scholar
Fijal, J. & Tokarz, M. (1975) Studies on the fluoroderivatives of minerals with layer structure. Miner. Polon. 6, 59–72.Google Scholar
Fishel, N.A. (1968) Saturated hydrocarbon izomerization process. U.S. Pat. 3 763 261.Google Scholar
Grim, R.E. (1968) Clay Mineralogy, pp. 434–444. McGraw-Hill Book Co. New York.Google Scholar
Granquist, W.T., Hoffman, G.W. & Boteler, R.C. (1972) Clay mineral synthesis. III. Rapid hydrothermal crystallization of an aluminian smectite. Clays Clay Miner. 20, 323–329.Google Scholar
Granquist, W.T. & Kennedy, J.V. (1967) Sorption of water at high temperatures on certain clay mineral surfaces. Correlation with lattice fluoride. Clays Clay Miner. 15, 103–120.CrossRefGoogle Scholar
Hervert, G. L. (1969) Isomerization process. U.S. Pat. 3 467 728.Google Scholar
Hingston, F.J., Atkinson, R.J., Posner, A.M. & Quirk, J.P. (1967) Specific adsorption of anions. Nature 215, 1459–1461.Google Scholar
Hingston, F.J., Posner, A.M. & Quirk, J.P. (1972) Anion adsorption by goethite and gibbsite. I. Role of proton in determining adsorption envelopes. J. Soil Sci. 23, 177–192.Google Scholar
Huang, P.M. & Jackson, M.L. (1965) Mechanism of reaction of neutral fluoride solution with layer silicates and oxides of soil. Soil. Sci. Soc. Am. Proc. 29, 661–665.Google Scholar
Judge, J.S. (1971) A study of dissolution of SiO in acidic fluoride solutions. J. Electrochem. Soc. 118, 1772–1775.Google Scholar
Lok, B.M., Gortsema, F.P., Messina, C.A., Rastelli, H. & Izod, T.P. (1983) Zeolite modification—direct fluorination. Pp. 41–58 in: Intrazeolite Chemistry (Stucky, G. D. & Dwyer, F. G., editors). ACS Symposium Series 218, Washington.Google Scholar
Oscik, J. (1973) Adsorpcja, pp. 72–77. PWN, Warszawa (in Polish).Google Scholar
Perrot, K.W., Smith, B.F.L. & Inkson, R.H.E. (1976) The reaction of fluoride with soils and soil mineral. J. Soil Sci. 23, 58–67.Google Scholar
Romo, L.A. & Roy, R. (1957) Studies of substitution of OH by F in various hydroxylic minerals. Am. Miner. 42, 165–177.Google Scholar
Sobel, J.E. (1973) Butene separation, isomerization and alkylation. U.S. Pat. 3 413 370.Google Scholar
Spurr, A.R. (1969) A low viscosity epoxy resin embedding medium for electron microscopy. J. Ulstrastruct. Res. 26, 31–43.Google Scholar
Stone, W.E.E. & Sanz, J. (1980) Distribution of ions in the octahedral sheet of micas. Pp. 317–329 in: Advanced Chemical Methods for Soil and Clay Minerals Research (Stucki, J. W. & Banwart, W. L., editors). D. Reidel Publishing Co., New York.Google Scholar