Hydrotalcite synthesis via co-precipitation reactions using MgO and Al(OH) 3 precursors

Hydrotalcite (Mg 6Al 2(OH) 16(CO 3)·4H 2O), also known as aluminum–magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications, such as clinic anti-acid, catalyst support, adsorptive flotati...

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Bibliographic Details
Published in:Ceramics international 2011-12, Vol.37 (8), p.3063-3070
Main Authors: Salomão, Rafael, Milena, L.M., Wakamatsu, M.H., Pandolfelli, Victor C.
Format: Article
Language:English
Subjects:
Aluminium hydroxide
Aluminum hydroxide
Ceramics
Coprecipitation
Hydration
Hydrotalcite
Magnesium oxide
Precursors
Production methods
Purification
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Summary:Hydrotalcite (Mg 6Al 2(OH) 16(CO 3)·4H 2O), also known as aluminum–magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications, such as clinic anti-acid, catalyst support, adsorptive flotation, flame retardant, acid scavengers in polymer composites and as a raw material for high temperature insulating porous ceramics. This compound is usually produced by controlled chemical equilibrium shifting processes (such as co-precipitation) that requires various other purification steps (centrifugation, for example) and careful drying (freeze drying or ultrafiltration). In this paper, a novel route to synthesize hydrotalcite is presented, based on the hydration, dissolution and co-precipitation reactions carried out almost simultaneously in aqueous suspension containing reactive magnesium oxide and aluminum hydroxide. Compared to other methods (the regular co-precipitation, particularly), it presents various technological advantages such as low time-energy consumption, no further purification step requirement, high output and competitive production costs.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2011.05.034