Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gecoa..69.3733p&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 69, Issue 15, p. 3733-3745.
Other
1
Scientific paper
We measured the adsorption of Cu(II) onto kaolinite from pH 3 7 at constant ionic strength. EXAFS spectra show that Cu(II) adsorbs as (CuO4Hn)n-6 and binuclear (Cu2O6Hn)n-8 inner-sphere complexes on variable-charge ≡AlOH sites and as Cu2+ on ion exchangeable ≡X--H+ sites. Sorption isotherms and EXAFS spectra show that surface precipitates have not formed at least up to pH 6.5. Inner-sphere complexes are bound to the kaolinite surface by corner-sharing with two or three edge-sharing Al(O,OH)6 polyhedra. Our interpretation of the EXAFS data are supported by ab initio (density functional theory) geometries of analog clusters simulating Cu complexes on the {110} and {010} crystal edges and at the ditrigonal cavity sites on the {001}. Having identified the bidentate (≡AlOH)2Cu(OH)20, tridentate (≡Al3O(OH)2)Cu2(OH)30 and ≡X--Cu2+ surface complexes, the experimental copper(II) adsorption data can be fit to the reactions 2≡AlOH+Cu+2HO=(Cu(OH)20+2H3(≡AlOH)+2Cu+3HO=(≡AlOOH)Cu(OH)30+4H and≡X--+Cu=≡X--+X.
Peacock Caroline L.
Sherman David M.
No associations
LandOfFree
Surface complexation model for multisite adsorption of copper(II) onto kaolinite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Surface complexation model for multisite adsorption of copper(II) onto kaolinite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface complexation model for multisite adsorption of copper(II) onto kaolinite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-955352