Details

Autor(en) / Beteiligte

• SHAHWAN, T
• ERTEN, H. N
• UNUGUR, S

Titel

A characterization study of some aspects of the adsorption of aqueous Co2+ ions on a natural bentonite clay

Ist Teil von

• Journal of colloid and interface science, 2006-08, Vol.300 (2), p.447-452

Ort / Verlag

San Diego, CA: Elsevier

Erscheinungsjahr

2006

Quelle

MEDLINE

Beschreibungen/Notizen

• The natural bentonite used in this study contained montmorillonite in addition to low cristobalite. The uptake of aqueous Co(2+) ions was investigated as a function of time, concentration, and temperature. In addition, the change in the interlayer space of montmorillonite was analyzed using XRPD, and the distribution of fixed Co(2+) ions on the heterogeneous clay surface was recorded using EDS mapping. The sorbed amount of Co(2+) appeared to closely follow Freundlich isotherm, with the sorption process showing apparent endothermic behavior. The relevance of the apparent DeltaH(o) values is briefly discussed. Analysis of the Co-sorbed bentonite samples using SEM/EDS showed that the montmorillonite fraction in the mineral was more effective in Co(2+) fixation than the cristobalite fraction. XRPD analysis demonstrated that the interlayer space of montmorillonite was slightly modified at the end of sorption.