FeWO4/g-C3N5 heterostructure for highly efficient visible-light-driven photocatalytic degradation of organic dyes
摘要
FeWO4/g-C3N5 composites were prepared by a facile hydrothermal method. The composition and morphology of the catalysts were characterized by infrared spectroscopy (IR), X-ray powder diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). The composition of FeWO4 and g-C3N5 successfully reduces the band gap of g-C3N5 and broadens visible light response range. Moreover, the as-prepared FeWO4/g-C3N5 composites inhibit the recombination of photoinduced carriers and improve the charge mobility. FeWO4/g-C3N5 composites exhibit significantly enhanced photocatalytic activity for the degradation of organic dyes including methylene blue (MB), rhodamine B (RhB), and methyl orange (MO) under visible light irradiation. As for the MB degradation, the best degradation kinetic rate constant of FeWO4/g-C3N5 composite is 3.6 times higher than that of pristine g-C3N5. Moreover, FeWO4/g-C3N5 composite shows good photostability and reusability after cycling experiments, which may be used for the treatment of real wastewater. A Z-scheme mechanism of dye photodegradation by FeWO4/g-C3N5 composite was also proposed based on the trapping experiment of the responsible radical species.