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- W1970893456 abstract "Quantum chemical calculations were performed to estimate relative Gibbs free energies of sulfate adsorption on variably charged Al- and Fe-(hydr)oxide clusters. Innersphere bidentate bridging and monodentate adsorption were predicted to be exergonic on positively charged Al- and Fe-(hydr)oxides (ranging from -19 to -124 kJ mol-1). However, inner-sphere and H-bonded adsorption on neutral Al- and Fe-(hydr)oxides was predicted to be endergonic (ranging from +5 to +61( kJ mol-1)). Atthe highest positive surface charge, bidentate bridging adsorption was most thermodynamically favorable. At intermediate positive surface charge, bidentate bridging and monodentate adsorption energies were equivalent on Al-(hydr)oxides; monodentate adsorption was more thermodynamically favorable on Fe-(hydr)oxides as compared with bidentate bridging adsorption. The predicted thermodynamic favorability of sulfate adsorption on Al- and Fe-(hydr)oxides was directly related to positive surface charge and indirectly related to the HO-/SO42- exchange stoichiometry, chi. Predicted Gibbs free energies of bidentate bridging and monodentate sulfate adsorption on an Fe-(hydr)oxide cluster (charge = +1, chi = 1) agreed reasonably well with published experimental estimates of sulfate adsorption on geothite (predicted values -34 and -52 kJ mol-1, respectively, and experimental range -36 to -30 kJ mol-')." @default.
- W1970893456 created "2016-06-24" @default.
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- W1970893456 date "2006-11-01" @default.
- W1970893456 modified "2023-09-25" @default.
- W1970893456 title "Quantum Chemical Calculations of Sulfate Adsorption at the Al- and Fe-(Hydr)oxide-H<sub>2</sub>O InterfaceEstimation of Gibbs Free Energies" @default.
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- W1970893456 doi "https://doi.org/10.1021/es061139y" @default.
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