ISSN:
1420-9055
Keywords:
Surface complexation
;
montmorillonite
;
silica
;
aluminum
;
proton surface charge
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The sorption mechanisms for trace metal ions on montmorillonite have been investigated. Complexation with surface hydroxyl groups located on the brocken edges of platelet particles is found to occur over a pH range similar to that observed on silica and other oxides, at comparable metal/site ratios. A second mechanism involving cation exchange on the negatively charge basal plane, which does not involve proton exchange in our experimental conditions, has been invoked to explain the low pH behavior. Consistent with this cation exchange mechanism, adsorption at low pH is strongly ionic strength dependant. A quantitative model which involves both mechanisms is presented and tested against both cation and proton adsorption data.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00877274
Permalink