NDLI: Kanemite (NaHSi2O5·3H2O) and its hydrogen-exchanged form

Content Provider	Royal Society of Chemistry (RSC)
Author	Knowles, James A. Hudson, Michael J. Apperley, David C. Keene, Matthew T. J.
Copyright Year	1995
Abstract	Kanemite, NaHSi2O5·3H2O, is able to exchange metal cations directly from aqueous solution. However, the degree of extraction is dependent upon whether kanemite or its hydrogen-exchanged form is the exchanger. Zinc cations, for example, are exchanged from basic solutions but the equilibrium extraction decreases with increasing acidity (at an equilibrium pH of 11.2, Kd=1070 cm3 g–1, whereas at an equilibrium pH of 4.88, Kd=70 cm3 g–1). Kanemite acts as an effective ion exchanger but the hydrogen-exchanged form is less effective, exchanging only by surface sorption at pH 2. In order to explain these and other properties, high-resolution solid-state magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) has been used to probe the structure of kanemite and its hydrogen-exchanged form. In kanemite there are only Q3 silicon-containing groups with extensive hydrogen bonding, and the interlamellar water molecules interact strongly with the silicate layers. In the hydrogen form, there is a dominance of Q3, but there are also Q2 and Q4 silicons. There is no NMR evidence for extensive hydrogen bonding and the SiO-H group is essentially undissociated. There are Bipolar interactions between the protons and the Q3 silicon atoms with weaker interactions with the Q2 and Q4. When the H-form is heated to 400 °C, some of the Q3 groups are involved in dehydroxylation reactions, as evidenced by the formation of Q4 silicons, but there are still some Q3 silicons remaining, and hence there are OH groups in the resulting material both from interlamellar water and Si-OH groups.
Starting Page	577
Ending Page	582
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	5
Issue Number	4
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9950500577
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PH Dissociation constant Ion Sorption Nuclear magnetic resonance spectroscopy Magic angle spinning Hydrogen List of protein interactions Silicate
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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