Study on the photo-catalytic efficiency of Fe_2O_3/TiO_2 nano-composite under UV and visible light

The sol-gel method is used to prepare the Fe_2O_3/TiO_2 nano-particles with various concent of Fe from 0.05% to 50%.XRD and TEM were used to characterize the crystal structure and surface appearance of the catalysts.Using methyl orange as indicator,the photo-catalytic efficiency of Fe_2O_3/TiO_2 nano-composites under UV and visible light was studied.Results showed that under UV-light the catalyst with the best photo-catalytic degradation efficiency is that one cantained 0.5% of Fe/Ti,and another one is that contained 10% of Fe/Ti,which was different from the historic reports.Under the visible light,the best efficient photo-catalyst for degradation is thatcontained 0.1% of Fe/Ti.