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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: f.ohashi@aist.go.jp
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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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