Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-22T22:34:17.080Z Has data issue: false hasContentIssue false
  • English
  • Français

Preparation and Porous Properties of Materials Prepared by Selective Leaching of Phlogopite

Published online by Cambridge University Press:  01 January 2024

Kiyoshi Okada ,
Noriyuki Nakazawa ,
Yoshikazu Kameshima ,
Atsuo Yasumori ,
Jadambaa Temuujin ,
Kenneth J. D. MacKenzie  and
Mark E. Smith
Kiyoshi Okada
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8552, Japan
Noriyuki Nakazawa
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8552, Japan
Yoshikazu Kameshima
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8552, Japan
Atsuo Yasumori
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8552, Japan
Jadambaa Temuujin*
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8552, Japan
Kenneth J. D. MacKenzie
Affiliation:
The New Zealand Institute for Industrial Research and Development, Lower Hutt, New Zealand
Mark E. Smith
Affiliation:
Department of Physics, University of Warwick, Coventry, UK
*
*E-mail address of corresponding author: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Porous silica products obtained by selective leaching of phlogopite using an acid solution were investigated by XRD, MAS NMR, SEM, TEM, DTA/TG, and N2 and Ar gas adsorptions. The phlogopite powder was leached by a nitric acid solution at various concentrations (0.01–10 M) at 5–150°C for 10 min–480 h. Selective leaching of the phlogopite powder became extensive when the concentration of nitric acid was >1 M. Only SiO2 remained after the treatment, the other components (MgO, Al2O3, K2O and Fe2O3) being selectively leached from the product. At higher leaching temperatures, the leaching rate became faster and the resulting maximum specific surface area of the porous silica product became larger at each leaching temperature. The porous silica products were found by SEM and TEM, to maintain their original platy particle shape even after the selective leaching. The 29Si MAS NMR spectra of the products, however, revealed that the linkage structure of SiO4 tetrahedra converted to a framework type from a layered type in the original phlogopite. The porous silica product with the maximum specific surface area (532 m2/g) was obtained by leaching in a nitric acid solution with concentration of 5 M at 90°C for 15 min. The pore-size distribution of the porous silica product was bimodal with micropores of ∼0.7 nm and mesopores of ∼4 nm. The pore size of the products changed from 0.7 nm to 4 nm and further to 6 nm with increased leaching time. The present results are discussed in relation to those reported for phlogopite by other workers.

Keywords

PhlogopitePorous PropertiesPorous SilicaSelective Leaching
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 5 , October 2002 , pp. 624 - 632
Copyright
Copyright © 2002, The Clay Minerals Society

References

Aznar, A.J. Gutierrez, E. Diaz, P. Alvarez, A. and Poncelet, G., (1996) Silica from sepiolite: Preparation, textural properties, and use as support to catalysts Microporous Materials 6 105–114 10.1016/0927-6513(95)00096-8.Google Scholar
Balci, S., (1999) Effect of heating and acid pre-treatment on pore size distribution of sepiolite Clay Minerals 34 647–655 10.1180/000985599546406.Google Scholar
Barrett, E.P. Joyner, L.G. and Halenda, P.P., (1951) The determination of pore volume and area distributions in porous substances. I. Computations from nitrogen isotherms Journal of the American Chemical Society 73 373–380 10.1021/ja01145a126.Google Scholar
Brunauer, S. Emmet, P.H. and Teller, E., (1938) Adsorption of gases in multimolecular layers Journal of the American Chemical Society 60 309–319 10.1021/ja01269a023.Google Scholar
Chon, M.C. Tsuru, T. and Takahashi, H., (1978) Changes in pore structure of kaolin mineral by sulfuric acid treatment Clay Science 5 155 162.Google Scholar
Harkonen, M.A. and Keiski, R.L., (1984) Porosity and surface area of acid-leached phlogopite: The effect of leaching conditions and thermal treatment Colloids and Surfaces 11 323–339 10.1016/0166-6622(84)80287-5.Google Scholar
Kaviratna, H. and Pinnavaia, T.J., (1994) Acid hydrolysis of octahedral Mg2+ sites in 2:1 layered silicates: An assessment of edge attack and gallery access mechanisms Clays and Clay Minerals 42 717–723 10.1346/CCMN.1994.0420607.Google Scholar
Komadel, P. Madejová, J. Janek, M. Gates, W.P. Kirkpatrick, R.J. and Stucki, J.W., (1996) Dissolution of hectorite in inorganic acids Clays and Clay Minerals 44 228–236 10.1346/CCMN.1996.0440208.Google Scholar
Kosuge, K. Shimada, K. and Tsunashima, A., (1995) Micropore formation by acid treatment of antigorite Chemistry Materials 7 2241–2246 10.1021/cm00060a009.Google Scholar
Le Van Mao, R. Kipkemboi, P. Levesque, P. Vailancourt, A. and Denes, G., (1989) Leached asbestos materials: Precursors of zeolites Zeolites 9 405–411 10.1016/0144-2449(89)90094-8.Google Scholar
Loughnan, F.C., (1969) Chemical Weathering of the Silicate Minerals New York Elsevier 154 pp.Google Scholar
Myriam, M. Suarez, M. and Martin-Pozas, J.M., (1998) Structural and textural modifications of palygorskite and sepiolite under acid treatment Clays and Clay Minerals 46 225–231 10.1346/CCMN.1998.0460301.CrossRefGoogle Scholar
Okada, K. Shimai, A. Takei, T. Hayashi, S. Yasumori, A. and MacKenzie, K.J.D., (1998) Preparation of microporous silica from metakaolinite by selective leaching method Microporous and Mesoporous Materials 21 289–296 10.1016/S1387-1811(98)00015-8.Google Scholar
Shinoda, T. Onaka, M. and Izumi, Y., (1995) Proposed models of mesopore structures in sulfuric acid-treated montmor-illonites and K10 Chemistry Letters 1995 495–496 10.1246/cl.1995.495.Google Scholar
Suquet, H. Chevalier, S. Marcilly, C. and Barthomeuf, D., (1991) Preparation of porous materials by chemical activation of the Llano vermiculite Clay Minerals 26 49–60 10.1180/claymin.1991.026.1.06.Google Scholar
Yasue, T. Kojima, Y. and Arai, Y., (1992) Recent study of and problems with surface improvement of asbestos Gypsum and Lime 238 194–204 (in Japanese).Google Scholar