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Synthetic allophane from highconcentration solutions: nanoengineering of the porous solid

Published online by Cambridge University Press:  09 July 2018

F. Ohashi ,
S.-I . Wada ,
M. Suzuki ,
M. Maeda  and
S. Tomura
F. Ohashi*
Affiliation:
Ceramics Research Institute, AIST Chubu, Shimo-Shidami, Moriyama, Nagoya 463-8560
S.-I . Wada
Affiliation:
Agricultural Department, Kyushu University, 6-10-1 Higashi, Hakozaki, Fukuoka 812-8581
M. Suzuki
Affiliation:
Research Center for Deep Geological Environments, AIST Tsukuba, 1-1-1, Higashi, Tsukuba 305-8567, Japan
M. Maeda
Affiliation:
Ceramics Research Institute, AIST Chubu, Shimo-Shidami, Moriyama, Nagoya 463-8560
S. Tomura
Affiliation:
Ceramics Research Institute, AIST Chubu, Shimo-Shidami, Moriyama, Nagoya 463-8560
*
*E-mail: [email protected]
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Abstract

The amorphous aluminosilicate allophane was synthesized by rapid mixing of inorganic solutions with high initial concentrations (10 – 100 mmol/l) followed by hydrothermal treatment. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed homogeneous products having a hollow spherical amorphous structure with a particle diameter of 3 – 5 nm. The amorphous products had a high BET specific surface area (490 – 552 m2/g) in comparison with natural allophane and had a narrow pore-size distribution (2 – 5 nm in diameter). The results of water vapour adsorption isotherm studies showed a gradual increase over the range of relative water vapour pressure of 0.6 – 0.9 and reached a maximum of ∼85 wt.%. The synthetic allophane shows promise as an adsorbent material because of its high adsorption-desorption capacity and its unique structure.

Keywords

nanoengineeringporous solidsallophane synthesisspherical hollow structureadsorption isotherms
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 3 , September 2002 , pp. 451 - 456
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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References

Clark, C.J. & McBride, M.B. (1984) Cation and anion retention by natural and synthetic allophane and imogolite. Clays and Clay Minerals, 32, 291–299.CrossRefGoogle Scholar
Henmi, T. (1987) The relationship of the properties and structure of allophane to its silica-alumina molar ratio. Nendo-Kagaku, 27, 32–44.Google Scholar
Henmi, T. & Wada, K. (1976) Morphology and composition of allophane. American Mineralogist, 61, 379–390.Google Scholar
Iler, R.K. (1979) The Chemistry of Silica. John Wiley & Sons, New York, pp. 622–630.Google Scholar
Tomura, S., Maeda, M., Inukai, K., Ohashi, F. & Suzuki, M. (1996) Synthesis of allophane from dilute solution of silica and alumina. Proceedings of the Internat ional Conference on Solvothermic Reactions, Takamatsu, pp. 177–179.Google Scholar
Van Der Gaast, S.J., Wada, K., Wada, S.-I. & Kakuto, Y. (1985) Small-angle X-ray powder diffraction, morphology, and structure of allophane and imogolite. Clays and Clay Minerals, 33, 237–243.CrossRefGoogle Scholar
Wada, K. (1989) Allophane and imogolite. Pp. 1051–1087 in: Minerals in Soil Environments (Dixon, J.B. & Weed, S.B., editors). Soil Science Society of America, Madison, Wisconsin.Google Scholar
Wada, S.-I. & Wada, K. (1977) Density and structure of allophane. Clay Minerals, 12, 289–298 CrossRefGoogle Scholar
Wada, S.-I., Eto, A. & Wada, K. (1979) Synthetic allophane and imogolite. Journal of Soil Science, 30, 347–355.CrossRefGoogle Scholar
Wada, K., Wilson, M., Kakuto, Y. & Wada, S.-I. (1988) Synthesis and characterization of a hollow spherical form of monolayer aluminosilicate. Clays and Clay Minerals, 36, 11–18.CrossRefGoogle Scholar
Wilson, M.A., McCarthy, S.A. & Fredericks, P.M. (1986) Structure of poorly-ordered aluminosilicates. Clay Minerals, 21, 879–897.CrossRefGoogle Scholar