Photocatalytic self-Fenton technology is regarded as a promising strategy to promote the removal of pollutants in wastewater, and the in-situ H2O2 production rate is one of the main factors affecting contaminant degradation performance. However, insufficient utilization of molecular oxygen results in poor activity in photocatalytic H2O2 production. Herein, we proposed a single-layer BiOCl nanoflower induced by biosurfactant with surface micelles to increase the oxygen adsorption and reduction rate. DFT results demonstrated that hydrophobic groups (-CH2-) on the surface of micelles could increase O2 adsorption site and then expand O2 adsorption capacity of BiOCl samples, which is also confirmed by the enhancement of O1s peak intensity in XPS spectra. Meanwhile, the charge concentrated on micelles surface can accelerate the reduction of molecular oxygen to reactive oxygen species, thus enhancing H2O2 production to reach 108.6 μmol within 60 min in pure water. Simultaneously, single-layer BiOCl improves the utilization rate of H2O2 by reducing the decomposition of H2O2 itself, resulting in a 16.8-fold increase in sulfamethoxazole degradation efficiency. These results could inspire further developments in photocatalytic degradation of antibiotics based on in-situ H2O2 production.

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