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Pregled bibliografske jedinice broj: 319732

Časopis

Autori: Sondi, Ivan; Tomašić, Vlasta; Filipović-Vinceković, Nada
Naslov: Release of Silicon and Aluminum from Montmorillonite Surfaces in Aqueous Systems
( Release of Silicon and Aluminum from Montmorillonite Surfaces in Aqueous Systems )
Izvornik: Croatica Chemica Acta (0011-1643) 81 (2008), 4; 623-629
Vrsta rada: članak
Ključne riječi: aluminum; clay minerals; release; montmorillonite; pH; silicon; surfaces
( aluminum; clay minerals; release; montmorillonite; pH; silicon; surfaces )
Sažetak:
The release of silicon and aluminum from purified Na-montmorillonite surfaces in aqueous systems was investigated in dependence of pH at 25oC. This study has shown that the dissolution of montmorillonite solid involves several parallel and sequential physico-chemical processes. The initial fast exchange of surface cations by hydrogen ions is followed by the release of aluminum and silicon. The dissolution rate of Si is higher than that of Al, proportional to the relative ratios of basal siloxane and edge surfaces. It is quantitatively described by the dissolution rate constants depending on pH. These results are in agreement with the heterogeneity of montmorillonite surfaces and the dominant presence of the siloxane basal surface. The shift of pH to more basic values by the ion exchange processes, and the hydrolysis of dissolved species, induces the formation of secondary amorphous solids, which may serve as precursors for the formation of amorphous aluminosilicates.
Projekt / tema: 098-0982934-2742, 098-0982915-2949, 119-0000000-1158
Izvorni jezik: eng
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Geologija,Kemija
URL cjelovitog teksta:
Google Scholar: Release of Silicon and Aluminum from Montmorillonite Surfaces in Aqueous Systems
Upisao u CROSBI: Ivan Sondi (sondi@irb.hr), 28. Sij. 2008. u 12:44 sati



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