Reduction of potential carcinogenic bromate formation is a big challenge for the application of ozone in the treatment of Br−-containing wastewater. Fluorite CeO2 typically has exposed (111), (110), and (100) facets. Due to the big discrepancy in atom arrangement, the three facets display significant difference in redox ability and acid properties, which would greatly affect the catalytic performance and mechanism in the ozonation of Br−-containing wastewater. Hence, the goal of this study is to disclose the mechanism of organic degradation and bromate inhibition during catalytic ozonation over faceted CeO2 nanocrystals. For such an end, three kinds of CeO2 nanocrystals individually with exposure of (100), (110), and (111) facets were prepared, and for the first time used as catalysts for the ozonation of Br−-containing wastewater. Sulfamethoxazole (SMZ), a commonly used antibiotic in mariculture and widely detected in natural waters, was selected as model refractory organic pollutants. The surface properties of CeO2, reactive oxidation species, oxidation intermediates (e.g., HBrO/BrO−, BrO3−, and bromated organics), and the bromine balance were investigated. Finally, the atomistic details of ozone adsorption and decomposition on each faceted surface were illustrated by density functional theory (DFT) calculations.

Efficiency and mechanism of pollutant degradation and bromate inhibition by faceted CeO2 catalyzed ozonation: Experimental and theoretical study

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