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- W2013516114 abstract "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+Cu2++2H2O=(≡AlOH)2Cu(OH)20+2H+3(≡AlOH)+2Cu2++3H2O=(≡Al3O(OH)2)Cu2(OH)30+4H+ and (A1)≡X−--H++Cu2+=≡X−--Cu2++X+." @default.
- W2013516114 created "2016-06-24" @default.
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- W2013516114 date "2005-08-01" @default.
- W2013516114 modified "2023-09-27" @default.
- W2013516114 title "Surface complexation model for multisite adsorption of copper(II) onto kaolinite" @default.
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- W2013516114 doi "https://doi.org/10.1016/j.gca.2004.12.029" @default.
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