Comment: |
SSD: adsorption of H+ or OH- from 0.1M HNO3 or 0.1M KOH after 24h equilibration [BM81]; SSD 70 sites/nm^2 (!), TGA: 14.5% H2O (corresponds to about 8.05 mmol/g surface moisture, therefore the value of SSD per unit weight is reasonably accurate, however SSD per unit surface area is high, obviously because of underestimation of SSA): nevertheless doubtful value; single extrapolation to zero-charge condition for titration in 0.001M KNO3; double extrapolation to alpha=c=0: pK1=4.0, pK2=10.5 |