Preparation of 2D square-like Bi2S3-BiOCl heterostructures with enhanced visible light-driven photocatalytic performance for dye pollutant degradation

摘要

A series of Bi2 S3-BiOCI composites with two-dimensional（2 D） square-like structures were prepared via a two-step anion exchange route.X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, and diffuse reflectance spectra（DRS）were used to investigate the properties of the as-prepared Bi2 S3-BiOCI heterostructures. The coupling of BiOCl and Bi2 S3 induced enhanced photoabsorption efficiency and bandgap narrowing. A reactive brilliant red X-3 B dye was used as a contaminant to test the photocatalytic activity of the obtained Bi2 S3-BiOCl samples under visible light irradiation. The sample Bi2 S3-BiOCl with a mass ratio of 8:4 exhibited the highest photodegradation efficiency, which was six times higher than that of pure BiOCl. In addition, a mechanism for the enhancement of photocatalytic activity is proposed.