Surface complexation modeling of uranyl adsorption onto kaolinite based clay minerals using FITEQL 3 2
Yazarlar (3)
D. Arda
Istanbul Üniversitesi, Türkiye
Prof. Dr. Fehime Jülide HIZAL YÜCESOY Istanbul Üniversitesi, Türkiye
R. Apak
Istanbul Üniversitesi, Türkiye
Makale Türü Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı Radiochimica Acta (Q1)
Dergi ISSN 0033-8230 Dergi Bilgileri (2006)
Dergi Tarandığı Indeksler SCI
Makale Dili İngilizce Basım Tarihi 01-2006
Kabul Tarihi – Yayınlanma Tarihi 01-12-2006
Cilt / Sayı / Sayfa 94 / 12 / 835–844 DOI 10.1524/ract.2006.94.12.835
Makale Linki https://www.degruyterbrill.com/document/doi/10.1524/ract.2006.94.12.835/html
UAK Araştırma Alanları
Analitik Kimya
Özet
The aim of this study is to explain how the kaolinite-based clay minerals adsorb hexavalent uranium (uranyl ion), and to model uranyl adsorption based on inner-sphere surface complexation with the kaolinite edge hydroxyl sites and outer-sphere complexation with the permanent charge sites. The adsorption of UO22+ on kaolinite-based clay was modeled with the aid of FITEQL 3.2 code using the single-site binding model of the Langmuir approach. Potentiometric titrations and adsorption capacity experiments were carried out in solutions containing different concentrations of the inert electrolyte NaClO4, however adsorption modeling was deliberately done at low ionic strength (0.01 M electrolyte) for enabling adsorption onto the permanent negatively charged sites of kaolinite. When a 'two-site' binding model was adopted, i.e., ≡S1OH sites representing silanol and ≡S2OH sites aluminol, a good fit was not obtained, and therefore the involvement of merely aluminol sites in surface complexation was assumed along with the ion exchange-held X22-UO 22+ species by the NaX permanent charge sites. The uranyl cation was assumed to bind to the clay surface as the sole (unhydrolyzed) UO22+ ion and form monodentate surface complexes. The modeling system comprised of surface complexation and ion exchange was resolved with respect to species distributions and relevant stability constants. Electrostatic effects were accounted for using a diffuse layer model (DLM) requiring the minimum number of adjustable parameters. Metal adsorption onto clay showed a steady increase with increasing pH up to pH 5.5, i.e., the edge pH for bulk precipitation at the studied concentration range. © by Oldenbourg Wissenschaftsverlag.
Anahtar Kelimeler
Adsorption | Clay | FITEQL | Kaolinite | Modeling | Uranium(VI) | Uranyl
BM Sürdürülebilir Kalkınma Amaçları
Atıf Sayıları
Web of Science 21
Scopus 24
Surface complexation modeling of uranyl adsorption onto kaolinite based clay minerals using FITEQL 3 2
İletişim
  • Yalova Üniversitesi Rektörlüğü, Bahçelievler Mah. Çınarcık Yolu Caddesi No: 26 Merkez - YALOVA, 77200
  • unis@yalova.edu.tr 0226 815 50 00
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