Design, preparation, and photocatalytic performance of MoSe2 quantum dots modified BiOCl composite photocatalysts

BiOCl-based heterojunctions with effective charge separation/transportation are highly desired for photocatalytic degradation of pollutants. Fantastic 0D/2D heterojunctions between MoSe 2 Quantum dots (QDs) and BiOCl (MoSe 2 QDs/BiOCl) were synthesized via liquid phase exfoliation and hydrothermal method . X-ray diffraction, scanning electron microscope , and transmission electron microscopy confirm the excellent crystallinity and the superior surface morphology of the combination of the two materials. The UV–Vis Diffuse Reflectance Spectroscopy shows that MoSe 2 QDs/BiOCl exhibits enhanced light absorption . Furthermore, electrochemical impedance spectroscopy and photoluminescence measurements suggest that the MoSe 2 QDs/BiOCl heterojunction promotes charge separation and transport of photogenerated carriers. As results, the optimized MoSe 2 QDs/BiOCl with 0.5 wt% of MoSe 2 QDs significantly enhances the degradation rate of Rhodamine B to 3.59 times (2.76 × 10 −3 min −1 ) that of pristine BiOCl (7.66 × 10 −4 min −1 ). Free radical capture experiments indicate that ·O 2− plays an overwhelming role in the Rhodamine B degradation, compared to h + or ·OH. Our experiments provide some new ideas for improving the photocatalytic degradation performance of BiOCl.