Combustion synthesis and photocatalytic properties of magnetically separable Zn_(1-x)Cd_xS/γ-Fe_2O_3 composites

摘要

Magnetically separable Zn_(1-x)Cd_xS/γ-Fe_2O_3(x=0-1) photocatalysts were synthesized by a one-step combustion method. The structures, morphologies, absorbance, optical and photocatalytic properties of the samples were studied by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible spectrophotometry and photoluminescence. The experimental results show that the formation of hexagonal Zn_(1-x)Cd_xS and γ-Fe_2O_3 and the combination of them were one-pot achieved. The Cd~(2+) content has a significant influence on the absorbance of visible light and fluorescence properties. The magnetic properties of samples ensure the magnetic separation by using a magnet. CdS/γ-Fe_2O_3 shows the best photocatalytic performance compared with other samples, ascribed to its small energy band gap and matching energy band structure between CdS and γ-Fe_2O_3. Moreover, no obvious deterioration was observed in the stability tests.