ISSN:
1420-9055
Keywords:
Adsorption
;
smectites
;
UO 2 2+
;
Cd2+
;
ion exchange
;
surface complexation
;
modeling
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A comparison was made between the adsorptive behaviors of Cd2+ and UO 2 2+ relative to two smectites that differed in their ratio of edge sites to fixed-charge sites. Adsorption varied with both pH and ionic strength, consistent with sorptive contributions of ion exchange and coordination reactions to edge hydroxyls. Both clay minerals exhibited a greater affinity for UO 2 2+ than for Cd2+, and the clay with a higher proportion of edge sites retained both ions more strongly. A computational model including fixed-charge sites and edge hydroxyls resulted in a good prediction of overall UO 2 2+ and Cd2+ uptake to both smectites.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00877270
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