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Clay Minerals; September 2002; v. 37; no. 3; p. 451-456; DOI: 10.1180/0009855023730052
© 2002 Mineralogical Society of Great Britain and Ireland
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Research Paper

Synthetic allophane from high-concentration solutions: nanoengineering of the porous solid

F. OHASHI1,*, S.-I. WADA2, M. SUZUKI3, M. MAEDA1 and S. TOMURA1

1 Ceramics Research Institute, AIST Chubu, Shimo-Shidami, Moriyama, Nagoya 463-8560, 2 Agricultural Department, Kyushu University, 6-10-1 Higashi, Hakozaki, Fukuoka 812-8581, and 3 Research Center for Deep Geological Environments, AIST Tsukuba, 1-1-1, Higashi, Tsukuba 305-8567, Japan

* E-mail: f.ohashi{at}aist.go.jp

(Received 5 September 2001; revised 16 January 2002)

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: nanoengineering, porous solids, allophane synthesis, spherical hollow structure, adsorption isotherms






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