Anatase TiO2 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 TiO2 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) TiO2. The results suggest that high-index {201) TiO2 exhibits the best Sb(III) adsorption and photocatalytic activity compared to the low-index TiO2. Both the Sb(III) adsorption density and the amount of "OH and O-2(.)-generated in solution were correlated to the magnitude of surface energy on TiO2 facets. Photocatalytically generated 'OH and (T)-were responsible for Sb(III) photooxidation as evidenced by radical-trapping experiments. The great contribution of 'OH was observed only on {2011 not on low-index TiO2. 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)-O-. dissipation. Therefore, the predominant participation of 'OH in Sb(III) photooxidation was only possible on high-index {201) TiO2, which resulted in an enhanced photocatalytic rate. On the other hand, %-dominated the Sb(III) photocatalytic oxidation on low-index TiO2. The intrinsic facet-dependent adsorption and photocatalytic mechanism obtained from this study would be useful for developing TiO(2)based environmental technologies. (C) 2017 Elsevier Inc. All rights reserved.