Standard molar Gibbs energies and activity coefficients of surface complexes on mineral-water interfaces (thermodynamic insights)

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Surface Complexation Modelling J. Lutzenkirchen (editor) © 2006 Elsevier Ltd. All rights reserved.

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Standard Molar Gibbs Energies and Activity Coefficients of Surface Complexes

Theoretical TiO2, experimental

14

SiO2, predicted ZnO, predicted Fe2O3, predicted

12

Al2O3, experimental

pHPPZC

10

Fe3O4, experimental Fe2O3, experimental

8 6 4 2 0 0

50

100

150

200

T, oC

250

300

350

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Standard Molar Gibbs Energies and Activity Coefficients of Surface Complexes

0 SiO2

ΔHoprot, kJ mol-1

-10

MnO2 ZrO2

-20 -30

Fe3O4

TiO2

Fe2O3 Al2O3

-40 FeOOH

-50

ZnO Al(OH)3

-60 2

4

6

8

10

pHPZC

0 Regression (r2 = 0.88): ΔHprot = -5.841pHPPZC + 9.127

ΔH

o prot,

kJ mol

-1

-10 -20 -30 -40 -50

Dashed line (theoretical): ΔHoprot = -5.708pHPPZC + 7.454

-60 2

4

6

8

pHPZC

10

12

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Standard Molar Gibbs Energies and Activity Coefficients of Surface Complexes

L-based new L truncated (SAT) H (no correction)

log10 (correction function)

1

0.8

0.6

0.4

0.2

0 -1.8

-1.6

-1.4

-1.2

-1

-0.8

-0.6

log10 (coverage fraction)

-0.4

-0.2

0

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