Photocatalytic degradation of methylene blue by C-vacancy and g-C3N4/BiOCl heterojunction
C-vacancy-containing g-C3N4 was synthesized using a hydrothermal method,and composite photocatalysts of g-C3N4/BiOCl with different BiOCl loadings were prepared.The structure,morphology,and light absorption properties of the photocatalysts were characterized using electron paramagnetic resonance,X-ray photoelectron spectroscopy,scanning electron microscopy,transmission electron microscopy,and ultraviolet-visible diffuse reflectance spectroscopy.Methylene blue was used as the degradation target to investigate the impact of carbon vacancies and BiOCl on the photocatalytic degradation performance of g-C3N4,along with the degradation mechanism of the composite photocatalyst.Results show that the synthesized composite photocatalyst,compared to BiOCl and g-C3N4 alone,can regulate the electronic structure and effectively separate photogenerated electrons and holes.This synergistic effect enhances the efficiency of photocatalytic degradation of methylene blue.With 70%BiOCl loading,the photocatalytic degradation efficiency of g-C3N4/BiOCl reached 88.6%after 90 minutes of light reaction,outperforming pure-phase g-C3N4 and BiOCl.
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