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Mechanism of the anion exchange reactions of the layered double hydroxides (LDHs) of Ca and Mg with Al

Radha, AV and Kamath, Vishnu P and Shivakumara, C (2005) Mechanism of the anion exchange reactions of the layered double hydroxides (LDHs) of Ca and Mg with Al. In: Solid State Sciences, 7 (10). pp. 1180-1187.

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Abstract

The nitrate containing layered double hydroxide (LDH) of Ca with Al on reaction with aqueous solutions of $Na_{2}CO_{3}$ and $Na_{3}PO_{4}$ yields $CaCO_{3}$ and $Ca_{5}(PO_{4})_{3}OH$ respectively rather than the carbonate/phosphate containing LDHs. The LDH of Mg with Al on reacting with dissolved phosphate ions also leads to the formation of unitary phosphates. This shows that the anion exchange reactions of layered double hydroxides take place by the dissolution-reprecipitation mechanism rather than by the topotactic mechanism.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: Layered double hydroxide;Hydrocalumite;Hydrotalcite;Dissolution-reprecipitation;Anion exchange
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 29 Nov 2005
Last Modified: 19 Sep 2010 04:21
URI: http://eprints.iisc.ernet.in/id/eprint/4217

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