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

F. Ohashi; S. I. Wada; M. Suzuki; M. Maeda; S. Tomura

doi:10.1180/0009855023730052

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

F. Ohashi, S. I. Wada, M. Suzuki, M. Maeda, S. Tomura

Bioproduction Environmental Sciences

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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.

Original language	English
Pages (from-to)	451-456
Number of pages	6
Journal	Clay Minerals
Volume	37
Issue number	3
DOIs	https://doi.org/10.1180/0009855023730052
Publication status	Published - Sept 2002

All Science Journal Classification (ASJC) codes

Geochemistry and Petrology

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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.",

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T1 - Synthetic allophane from high-concentration solutions

T2 - Nanoengineering of the porous solid

AU - Ohashi, F.

AU - Wada, S. I.

AU - Suzuki, M.

AU - Maeda, M.

AU - Tomura, S.

PY - 2002/9

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AB - 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.

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

Abstract

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