A systematic investigation of aluminium ion speciation at high temperature. Part 1. Solution studies.
Identifieur interne : 002F22 ( Main/Exploration ); précédent : 002F21; suivant : 002F23A systematic investigation of aluminium ion speciation at high temperature. Part 1. Solution studies.
Auteurs : Kirill L. Shafran [Royaume-Uni] ; Carole C. PerrySource :
- Dalton transactions (Cambridge, England : 2003) [ 1477-9226 ] ; 2005.
Abstract
Speciation diagrams of aluminium ions in aqueous solution (0.2 M) at high temperature (90 degrees C) have been obtained from 48 h time-resolved multi-batch titration experiments monitored by 27Al NMR spectroscopy, potentiometry and dynamic light scattering. The quantitative speciation patterns and kinetic data obtained offer a dynamic picture of the distribution of soluble and insoluble Al species as a function of hydrolysis ratio h(h=[OH-]/[Al3+]) over a very broad range of conditions (-1.0 < or =h < or = 4.0). Monomeric, small oligomeric, tridecameric (the 'Al13-mer') and the recently characterised 30-meric aluminium species (the 'Al30-mer') as well as aluminium hydroxide have been identified and quantified. The Al13-mer species dominates over a relatively broad range of hydrolysis ratios (1.5 < or =h< or = 2.7) during the first 6 h of experiment, but are gradually replaced by Al30-mers at longer reaction times. Kinetic profiles indicate that the formation of the Al30-mer is limited by the disappearance of the Al13 species at mildly acidic conditions. The estimated rate constants of both hydrolytic processes show good internal correlation at h> or = 1.5. The effect of local perturbations leading to the formation of aluminium hydroxide below the electroneutrality point (h= 3.0) has been estimated quantitatively.
DOI: 10.1039/b502097b
PubMed: 15957049
Affiliations:
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