Open AccessThe Effect of Reduction on the Adsorptive Behaviour of the TiO2/Water Interface
Author(s) -
V. Antonucci,
A.S. Aricò,
N. Giordano,
P.L. Antonucci
Publication year - 1989
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361748900600201
Subject(s) - chemistry , adsorption , potentiometric titration , electrochemistry , stoichiometry , oxide , inorganic chemistry , diffraction , analytical chemistry (journal) , electrode , chromatography , organic chemistry , optics , physics
The effect of mild reduction treatment on TiO 2 surfaces has been investigated by the ZPC (zero point of charge) potentiometric technique. Different extents of reduction result in a series of oxides distinguished either by their adsorption characteristics or electrochemical properties. Non-stoichiometric surface oxide formation has been demonstrated by X-ray diffraction and flat-band potential (V fb ) measurements. The generation of surface states with essentially acid–base characteristics has been shown to be a determining factor in the photo-oxidation–photodecomposition of water. A number of hypotheses relating to the nature of the adsorption-determining sites have been advanced.