| Mineral: |
Anatase |
| Reference: |
JA98 |
| SCM Type: |
TL - Triple Layer |
| Ligand: |
Co<2+>
- cobalt(II)
|
| Site Type: |
»Ti-OH |
| Equation: |
»Ti-OH + Co<2+> + Cl<1-> ⇔ »Ti-O-CoCl + H<1+> |
| LogK: |
-2.6 LogK°I=0 (Conversion to I = 0): -2.17
LogK2.31 nm−2 (SSD-normalized): -2.26
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
0.1 mol/L
NaCl
|
| Solid/Liquid Ratio: |
10.0 g/L |
| pH Range: |
2.5-12 |
| Ligand Concentration Range: |
<3E-8 mol/L |
| Fit Method: |
FITEQL |
| Comment: |
TiO2 is mixture of anatase and rutile (see [J99a,b]); sorption was calculated from measurements of the radioactivity of the nuclides in the phases at varying pH and I); cobalt sorption show no dependence on the ionic strength, indication the formation of an inner sphere complex; reaction can also be written as SOH + Co2+ + Cl- = SOCo+ + Cl- + H+, the used model can not dinstinguish between the two reactions; reference logK for background electrolyte: not correct >>SOH2+ + Cl-=SOH2Cl : -1.5 for alumina[S89b]; SO- + Na+ = SONa: -1.2 [RAV94) for goethite |
| |
