Photocatalytic activity of nanocrystalline ZnO, α-Fe2O3 and ZnFe2O4/ZnO

M. N. Zulfiqar Ahmed, K. B. Chandrasekhar, A. A. Jahagirdar, H. Nagabhushana, B. M. Nagabhushana
2015 Applied Nanoscience  
Nanocrystalline powders of ZnO, a-Fe 2 O 3 and ZnFe 2 O 4 /ZnO were prepared by solution combustion method. The characterization of the nano powders was done by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The ZnO and a-Fe 2 O 3 nanopowders exhibited the wurtzite and hexagonal phases, respectively. The PXRD pattern of ZnFe 2 O 4 /ZnO indicated the spinel phase of zinc ferrite and wurtzite phase of zinc oxide. The three
more » ... oxide. The three nanopowders were used as photocatalysts for the removal of the azodye brilliant yellow (BY) from its aqueous solution. A comparison of the results indicated that ZnFe 2 O 4 /ZnO showed better photocatalytic activity for the removal of BY than ZnO and a-Fe 2 O 3 . This was attributed to the synergistic effect between ZnFe 2 O 4 and ZnO resulting in better charge separation and reducing the electron-hole recombination. The photocatalytic activity followed the order: ZnO \ a-Fe 2 O 3 \ ZnFe 2 O 4 /ZnO.
doi:10.1007/s13204-014-0395-1 fatcat:dicifgo7jrbs3d5mybxh7tiedm