TiO(2) crystal facet-dependent antimony adsorption and photocatalytic oxidation.

Anatase TiO crystal facets are garnering increasing attention due to their unique surface property. However, no specific linear relationship had been derived between the facet exposed on TiO and the surface adsorption capacity as well as photocatalytic performance. This study systematically explored the facet effects on antimony (Sb) adsorption and photocatalytic oxidation using high-index {201} and low-index {101}, {001}, and {100} TiO. The results suggest that high-index {201} TiO exhibits the best Sb(III) adsorption and photocatalytic activity compared to the low-index TiO. Both the Sb(III) adsorption density and the amount of OH and O generated in solution were correlated to the magnitude of surface energy on TiO facets. Photocatalytically generated OH and O were responsible for Sb(III) photooxidation as evidenced by radical-trapping experiments. The great contribution of OH was observed only on {201}, not on low-index TiO. This phenomenon was found to be attributable to the high surface energy on {201}, which enables the generation of a large amount of photogeneration OH to compensate for the fast rate of OH dissipation. Therefore, the predominant participation of OH in Sb(III) photooxidation was only possible on high-index {201} TiO, which resulted in an enhanced photocatalytic rate. On the other hand, O dominated the Sb(III) photocatalytic oxidation on low-index TiO. The intrinsic facet-dependent adsorption and photocatalytic mechanism obtained from this study would be useful for developing TiO-based environmental technologies.