A characterization study of some aspects of the adsorption of aqueous Co2+ ions on a natural bentonite clay.
J Colloid Interface Sci
; 300(2): 447-52, 2006 Aug 15.
Article
in En
| MEDLINE
| ID: mdl-16774761
ABSTRACT
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.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cobalt
/
Ions
Language:
En
Journal:
J Colloid Interface Sci
Year:
2006
Document type:
Article
Affiliation country:
Turkey