Abstract
BiOBr is a promising photocatalytic semiconductor material for pollutant treatment, but its photocatalytic application is limited due to its poor photo-oxidation capability. Hydroxyl radicals (OH) play a key role in surface photochemical reaction. Thus, improving the response of semiconductor catalysts to hydroxyl is a key problem to be solved through a suitable surface atomic regulation strategy. In this study, we selected a meso-erythritol (ME) containing a number of hydroxyl groups to regulate the surface of BiOBr nanosheets. The ME-regulated BiOBr sheets showed a more positive valence band and a much improved oxidation capability than the unregulated ones. The ME-regulated BiOBr nanosheets also had a positive response to OH in the photocatalytic process. The BiOBr nanosheets rapidly degraded phenol and RhB at a high concentration (0.4 mmol L−1). This strategy of surface atom regulation by using sugars provided a reliable means of obtaining highly effective photocatalytic materials.
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