Abstract
Adsorption of L-glutamic acid, L- ( + )-lysine, and DL-serine on amorphous Ti hydrous oxide has been investigated as a function of pH. Whilst the serine does not adsorb in the pH range between 3.5 and 8, the uptake of the other two amino acids shows a complex dependence on the pH and also occurs under conditions of strong electrostatic repulsion at pH>8. Hydrogen bonding between deprotonated amino groups and surface hydroxyl groups is suggested as a possible explanation for observed adsorption when electrostatic repulsion prevails.
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