RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Montmorillonite
Reference: BM11
SCM Type: NE - Non-electrostatic
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Si-OH
Equation: »Si-OH + UO2<2+> + H2O  ⇔  »Si-O-UO2(OH) + 2 H<1+>
LogK: -4.2        LogK°I=0 (Conversion to I = 0):   -4.20
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaCl
Temperature: 298.0 K
Solid/Liquid Ratio: 1.66 g/L
pH Range: 4-9
Ligand Concentration Range: 4.2E-7 mol/L
Fit Method: PEST
Comment: SWy-2; at edge sites; original equation in the study »Si-OH + UO2OH<1+> = »Si-O-UO2(OH) + H<1+> with logK = 1.0, UO2<2+> + H2O = UO2OH<1+> + H<1+> log K = -5.2 [GFFGN03]
 
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