The mechanism of retention of vanadium oxo-species at the “titanium oxide / aqueous solution" interface

The mechanism of retention of vanadium oxo-species at the “titanium oxide/aqueous solution”
interface was investigated over a wide pH range (4-9) and V(V) solution concentration (10-5-2×10-2 M)
by combining equilibrium deposition experiments, potentiometric titrations, microelectrophoresis and
“proton–ion” titration curves. It was inferred that the adsorbed V(V) oxo-species are retained inside
the compact layer of the interface through hydrogen/coordinative bonds forming very probably innersphere
complexes with the titania surface groups.