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Pregled bibliografske jedinice broj: 319732

Release of Silicon and Aluminum from Montmorillonite Surfaces in Aqueous Systems


Sondi, Ivan; Tomašić, Vlasta; Filipović-Vinceković, Nada
Release of Silicon and Aluminum from Montmorillonite Surfaces in Aqueous Systems // Croatica Chemica Acta, 81 (2008), 4; 623-629 (međunarodna recenzija, članak, znanstveni)


Naslov
Release of Silicon and Aluminum from Montmorillonite Surfaces in Aqueous Systems

Autori
Sondi, Ivan ; Tomašić, Vlasta ; Filipović-Vinceković, Nada

Izvornik
Croatica Chemica Acta (0011-1643) 81 (2008), 4; 623-629

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
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.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija



POVEZANOST RADA


Projekt / tema
098-0982915-2949 - Površinski aktivne tvari, procesi u otopinama i na međupovršinama (Maja Dutour Sikirić, )
098-0982934-2742 - Nanočestice u biogeokemijskim procesima u okolišu (Ivan Sondi, )
119-0000000-1158 - Međudjelovanje minerala i okoliša (Vladimir Bermanec, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus