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In order to obtain TiO2 with high photocatalytic activity,a cathode reduction was used to dope I 7+ and I5+into TiO 2 nanotubes of anodized Ti in C2H2O4·2H2O+NH4F electrolyte.SEM images show that the anodization method integrated the preparation with the doping process,which for nonmetals-doping is advantageous to maintain the morphological integrity of TiO2 nanotubes. I7+-I5+-doping enhances the UV response of TiO 2 and result in a red-shift.Under UV/visible irradiation,a I7+-I5+-doped sample(400°C)showed the highest Iph and photocatalytic efficiency.A part of I - in the I7+-I5+-doped sample is involved in the UV re-sponse,the red-shift and the higher Iph.
In order to obtain TiO2 with high photocatalytic activity, a cathode reduction was used to dope I 7+ and I5 + into TiO 2 nanotubes of anodized Ti in C2H2O4 · 2H2O + NH4F electrolyte. SEM images show that the anodization method integrated the preparation with the doping process, which for nonmetals-doping is advantageous to maintain the morphological integrity of TiO2 nanotubes. I7 + -I5 + -doping enhances the UV response of TiO2 and result in a red-shift. UVdervisible UV / visible irradiation, aI7 + -I5 + doped sample (400 ° C) showed the highest Iph and photocatalytic efficiency. A part of I - in the I7 + -I5 + -doped sample is involved in the UV re-sponse, the red-shift and the higher Iph.