Adsorption properties, titanium dioxide

Although the surface models for anatase and rutile, as proposed by different authors, are idealized and differ from each other in details, it can certainly be concluded that coordinatively unsaturated Ti4+cations, O2- ions, and OH groups in widely varying configurations should be exposed on partially hydrated and/or hydroxylated surfaces. Depending on the local environments of these sites, a wide spectrum of possible intermolecular interactions should be the consequence which may render specific adsorption processes possible. Finally, the ease of the surface reduction of titanium dioxides due to hydrocarbon contamination (19) leads to the formation of new types of surface sites and to drastic changes of the surface properties. 

An increasing interest in studying silver particles and clusters adsorbed on titanium dioxide surface is provided by the efficiency of such systems as photocatalysts. Their catalytic properties are more evident than those of individual Ti02, both anatase and rutile-anatase mixture. There are few publications devoted to quantum chemical calculations of metal clusters adsorbed on TiOz surface at the modem level of theory. Besides, existing theoretical data describe adsorption of silver atom on mtile surface only. 

Soltys, M.M. et al., Poly(methacrylic acid) adsorption and electrical surface properties of titanium dioxide suspensions. Ads. Sci. Technol., 20, 633, 2002. 

Kohtani, S., Yoshioka, E., Saito, K., Kudo, A., Miyabe, H. (2012). Adsorptive and kinetic properties on photocatal3ftic hydrogenation of aromatic ketones upon UV irradiated polycrystalline titanium dioxide differences between acetophenone and its trifluoromethylated derivative. Journal of Physical Chemistry C, 116, 17705—17713. http //dx.doi.org/10.1021/jp3056174. 

---