Specific adsorption of cations on hydrous γ-Al2O3
作者： Chin-Pao Huang , Werner Stumm
DOI: 10.1016/0021-9797(73)90387-1
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摘要: The amphoteric properties of hydrous γ-Al2O3 and the distribution earth alkaline cations in oxide-electrolyte interface was evaluated from alkalimetric acidimetric titration curves aqueous dispersions. In NaCl electrolytes (25°C), pH zero point charge is pHzpc = 8.5; acid-base can be characterized terms a heterogeneous two-protic acid with intrinsic acidity constants pKint1 7.9 pKint2 9.1. The extent adsorption Ca2+ other on increases increasing pH; finite observed at values slightly lower than pHzpc. Evaluation measurements indicates that M2+ described by: AlOH + ⇄ AlOM+ H+. Operational association for this equilibrium were determined; series Mg2+ > Sr2+ Ba2+. pH-range above pHzpc, these ions, upon being adsorbed may reverse surface oxide suspension.
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