Preparation and Photo-catalytic Activity of Nano-Iron Oxide/Bentonites

Using the surfactant（PVA）in the preparation process，the nano-iron oxide / Bentonites were prepared through a reaction between a solution of iron salt and a dispersion of Bentonite clay. The X-ray diffraction（XRD）results reveal that the catalysts mainly consist of α-Fe2O3 . The photo-catalytic activity of iron oxide / Bentonites was examined in the photo-assisted degradation of an organic azo-dye Orange Ⅱ. It is found that the photo-catalytic activity of the catalysts is much higher than that of α-Fe2O3 . The experimental results（using the different catalysts in which the quantities of Fe2O3 are equal）demonstrate that the photo-catalytic activity of catalysts is as follows：Fe-A > Fe-B > Fe-C > Fe-D. In addition，the research shows that Orange Ⅱ degradation ratio of heterogeneous photo-Fenton process is higher than that of homogeneous one.