Abstract
Novel fibrous BiVO4/CdS heterostructures were fabricated for photodegradation of Rhodamine B (RhB) dyes. Caterpillar shaped BiVO4 nanofibers were produced by electrospinning and post calcinations. Controllable quantity of CdS nanoparticles were uniformly decorated on BiVO4 fiber surface by electrostatic interaction. Both the BiVO4 nanofibers and CdS nanoparticles present high crystallinity. The integration of CdS can significantly enhance the absorption of visible light and separation efficiency of photo-generated charge in BiVO4/CdS composites. As a result, the photocatalytic efficiency and apparent reaction rate constant of the optimized BiVO4/CdS-2 display 1.6 and 3 times as high as that of pure BiVO4 after 120 min irradiation under visible light, respectively. Moreover, the BiVO4/CdS-2 nanofibers show good stability for repeated visible light photocatalytic application. The scavengers added photocatalytic experiments indicate the crucial roles of •O2− and h+ for the degradation process, and a Z-scheme photocatalytic mechanism was proposed for the BiVO4/CdS system. Due to the simple and low-cost synthetic method, the fibrous BiVO4/CdS catalysts are suitable for practical applications.
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