Fabrication of 2D/2D BiOBr/g-CN with efficient photocatalytic activity and clarification of its mechanism.

Precise regulation of photoexcited charge carriers for separation and transportation is a core requirement for practical application in the photocatalysis field. Herein, a 2D/2D BiOBr/g-CN heterojunction is prepared by a self-assembly method and exhibits enhanced and stable activity for photocatalytic degradation of bisphenol A (BPA) and norfloxacin (NFA) under visible light. Compared to pure g-CN, the kinetic constants of BPA and NFA degradation over BiOBr/g-CN are enhanced by about 14.74 and 4.01 times, respectively. The separation and transportation mechanism for the photoexcited charge carriers is clarified by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy ( XPS), and theoretical calculations. The results show that BiOBr/g-CN exhibits the feature of a relative p-n junction, in which the charges photoexcited on BiOBr/g-CN with high redox potentials can be kept and spatially separated. Moreover, the built-in electric field with the direction of g-CN → BiOBr and the opportune band curvature provide the driving force for charge separation and transportation. Additionally, BPA and NFA degradation intermediates are also detected by liquid chromatography-mass spectrometry. It is of great significance to fabricate efficient photocatalysts for environmental purification and other targeted reactions.