Studies on the mechanism of hydrolysis and polymerization of aluminum salts in aqueous solution: correlations between the “Core-links” model and “Cage-like” Keggin-Al13 model
✍ Scribed by Shuping Bi; Chenyi Wang; Qing Cao; Caihua Zhang
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 326 KB
- Volume
- 248
- Category
- Article
- ISSN
- 0010-8545
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✦ Synopsis
Two conflicting models describe the mechanism of aluminum (Al) hydrolysis and polymerization in aqueous solution, namely, the "Core-links" model and the "Cage-like" Keggin-Al 13 model. For the sake of simplicity, the expressions of Al 13 in the "Core-links" model and the "Cage-like" model are termed as C-Al 13 and K-Al 13 , respectively. The two models have co-existed for almost 50 years, but describe differences in the transformation of polymeric Al speciation in aqueous solution, such as, hydrolysis, polymerization, flocculation, precipitation and crystallization. Many of the polynuclear Al species presented in the literature cannot be adequately described with either the "Core-links" model or the "Cage-like" Keggin-Al 13 model. This paper introduces new considerations for the mechanism of Al hydrolysis and polymerization in aqueous solution, a "Continuous" model representing a unification of the "Core-links" model and "Cage-like" model,