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Influence of hydrolysis on the sorption of metal cations by smectites: Importance of edge coordination reactions 总被引:1,自引:0,他引:1
A comparison was made between the adsorptive behaviors of Cd2+ and UO
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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
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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
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and Cd2+ uptake to both smectites. 相似文献
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