Phenolic pollutants as highly toxic and hazardous organics are widely generated from industrial and domestic process. Phenolic pollutants with different hydroxyl position (catechol, resorcinol, hydroquinone, phenol) were preferentially and efficiently oxidized in photocatalytic process (PC) by designing boron-doped TiO (B-TiO).The key role for enhancing the photocatalytic activity of B-TiO was the formation of abundant Ti species. The formation of Ti-O weakened the competitive adsorption of HO in aqueous solution and favored the formation of cooperative hydrogen bond on the surface of B-TiO, leading to enhanced adsorption of phenolic pollutants. The degradation rate constant of B-TiO (k) was regardless of the corresponding oxidation potential of phenolic pollutants. The k for catechol in photocatalytic process was as high as 3.46 min, which was 18.2, 1.6 times higher than that of biodegradation and ozonation methods, respectively. Of note, the preferential removal mechanism of phenolic pollutants was elucidated by in-situ attenuated total reflectance (ATR)-IR and density functional theory calculation (DFT). The results were helpful for developing new preferential oxidation technologies in HO∙-mediated process for selectively removing low concentration but highly toxic pollutants.
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