Constructing 0D/1D Bi2S3/Sb2S3 Z-scheme heterojunctions for efficient visible-light-driven degradation of dyes, Cr6+ reduction and H2O2 production

Direct Z-scheme heterojunctions can efficiently promote charge separation/shift for the improvement of photocatalytic performances. In this work, the novel 0D/1D Bi2S3/Sb2S3 Z-scheme heterojunctions were prepared via a simple hydrothermal method. These Bi2S3/Sb2S3 heterojunctions could completely degrade 10 ppm of MB, RhB and MO in aqueous solutions under visible light irradiation for 30, 60 and 120 min, respectively. And also, over the heterojunctions, 20 ppm of Cr6+ solution was able to being completely reduced with 80 min of visible light illumination. The excellent H2O2 production rate of 130 μmol·g−1·h−1 was exhibited, which are far more than those of single Sb2S3 (∼17 folds) and Bi2S3 (∼1.9 folds). This is due to the rational design and construction of 0D/1D Bi2S3/Sb2S3 Z-scheme heterojunctions, broadening the light absorption range, promoting the separation and transference of photo-induced carriers and affording rich active area for superior redox reactions. This illustrates the promising application of Bi2S3-based heterojunctions for pollutant removal and energy transfer.