Jm. Zachara et Jp. Mckinley, INFLUENCE OF HYDROLYSIS ON THE SORPTION OF METAL-CATIONS BY SMECTITES- IMPORTANCE OF EDGE COORDINATION REACTIONS, Aquatic sciences, 55(4), 1993, pp. 250-261
Citations number
24
Categorie Soggetti
Water Resources",Limnology,"Marine & Freshwater Biology
A comparison was made between the adsorptive behaviors of Cd2+ and UO2
2+ relative to two smectites that differed in their ratio of edge site
s to fixed-charge sites. Adsorption varied with both pH and ionic stre
ngth, consistent with sorptive contributions of ion exchange and coord
ination reactions to edge hydroxyls. Both clay minerals exhibited a gr
eater affinity for UO22+ than for Cd2+, and the clay with a higher pro
portion of edge sites retained both ions more strongly. A computationa
l model including fixed-charge sites and edge hydroxyls resulted in a
good prediction of overall UO22+ and Cd2+ uptake to both smectites.