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Structural Changes of Allophane During Purification Procedures as Determined by Solid-State 27Al and 29Si NMR

Published online by Cambridge University Press:  01 January 2024

Syuntaro Hiradate
Syuntaro Hiradate*
Affiliation:
Department of Biological Safety Science, National Institute for Agro-Environmental Sciences (NIAES), 3-1-3 Kan-nondai, Tsukuba, Ibaraki 305-8604, Japan
*
*E-mail address of corresponding author: hiradate@affrc.go.jp
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Abstract

Allophanes are poorly crystalline and quasi-stable aluminosilicate minerals, the structures of which are sensitive to chemical treatment. In the present study, solid-state 27Al and 29Si nuclear magnetic resonance (NMR) spectra of allophane samples were monitored as they went through several purification procedures. It was confirmed that no significant structural changes were caused by boiling with 6% H2O2 to remove organic matter, by size fractionation (sonification), by sedimentation, by precipitation at pH 4.0, or by dithionite-citrate-bicarbonate treatment for the removal of Fe (hydr)oxides. Hot 5% Na2CO3 treatment for the removal of reactive silica-alumina gels and adsorbed citrate from allophane samples, however, decreased signal intensity corresponding to imogolite-like Si (Q33VIAl, −78 ppm in 29Si NMR) and increased signal intensities corresponding to IVAl (55 ppm in 27Al NMR) and possibly X-ray amorphous aluminosilicates (centered at −85 ppm in 29Si NMR). Cold (room temperature) 5% Na2CO3 treatment for 16 h proved to be effective in avoiding these structural changes.

Keywords

27Al NMRImogoliteKiP PumiceKitakami Pumice29Si NMRSolid-state MAS NMRVolcanic Glass
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 6 , December 2005 , pp. 653 - 658
Copyright
Copyright © 2005, The Clay Minerals Society

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