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Formation of Aluminum Hydroxides as Influenced by Aluminum Salts and Bases

Published online by Cambridge University Press:  28 February 2024

K. P. Prodromou  and
A. S. Pavlatou-Ve
K. P. Prodromou
Affiliation:
Laboratory of Applied Soil Science, Aristotelian University of Thessaloniki, 540 06 Thessaloniki, Greece
A. S. Pavlatou-Ve
Affiliation:
Laboratory of Soil Science, Aristotelian University of Thessaloniki, 540 06 Thessaloniki, Greece
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Abstract

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The influence of different ions in the formation of Al(OH)3 polymorphs has been studied experimentally by promoting stoichiometric reactions between the aluminum salts (AlCl3, Al(NO3)3, Al2(SO4)3) and bases (NaOH, KOH, NH4OH). In all cases the polymorphs obtained were a mixture of gibbsite, bayerite and nordstrandite or pseudoboehmite with the exception of the reaction between KOH, or NH4OH and Al2(SO4)3 which produced amorphous gels. Ageing of these gels at ambient temperature and pressure for 180 days or at 60°C for 20 days resulted in crystalline structure. Specifically, pseudoboehmite was crystallized from the reaction between Al2(SO4)3 and NH4OH. Significantly, of all ions present in solution in the present experiment, only the sulphate ones were observed to have a marked influence in the precipitation of Al oxyhydroxides.

Keywords

Aluminum hydroxidesPseudoboehmiteSulfates
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 1 , February 1995 , pp. 111 - 115
Copyright
Copyright © 1995, The Clay Minerals Society

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