Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-28T16:04:20.288Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Bamhisel, R. I., and Rich, C. I. 1985 . Gibbsite, bayerite and nordstrandite formation as affected by anions, pH and mineral surfaces. Soil Sci. Soc. Am. Proc. 29: 531–534.CrossRefGoogle Scholar
Hsu, Pa Ho, and Bates, T. F. 1964 . Formation of X-ray amorphous and crystalline aluminum hydroxides. Mineral. Mag. 33: 749–768.Google Scholar
Hsu, Pa Ho. 1989 . Minerals in Soil Environments. Madison, Wisconsin: Soil Sci. Soc. Am., 331–378.Google Scholar
Kodama, H., and Schnitzer, M. 1980 . Effect of fulvic acid on the crystallization of aluminum hydroxides. Geoderma 24: 195–205.CrossRefGoogle Scholar
Kwong Ng Kee, K. F., and Huang, P. M. 1977 . Influence of citric acid on the hydrolytic reaction of aluminum. Soil Sci. Soc. Am. J. 41: 692–697.CrossRefGoogle Scholar
Ross, G. J., and Turner, R. C. 1971 . Effect of different anions on the crystallization of aluminum hydroxide in partially neutralized aqueous aluminum salt systems. Soil Sci. Soc. Am. Proc. 35: 389–392.CrossRefGoogle Scholar
Schoen, R., and Roberson, E. C. 1970 . Structures of aluminum hydroxide and geochemical implication. Am. Mineral. 55: 43–77.Google Scholar
Violante, A., and Violante, P. 1980 . Influence of pH, concentration, and chelating power of organic anions on the synthesis of aluminum hydroxides and oxyhydroxides. Clay & Clay Miner. 28: 425–433.CrossRefGoogle Scholar
Violante, A., and Jackson, M. L. 1981 . Clay influence on the crystallization of aluminum hydroxide polymorphs in the presence of citrate, sulfate or chloride. Geoderma 25: 199–214.CrossRefGoogle Scholar
Violante, A., and Huang, P. M. 1985 . Influence of inorganic and organic ligands on the formation of aluminum hydroxides and oxyhydroxides. Clay & Clay Miner. 33: 181–192.CrossRefGoogle Scholar