Study On Photoelectric Properties Of Nano - Tube Array Modified By Metal Oxide Modified TiO 2

TiO2 NTAs combined with photoelectrocatalytic technology was a kind of high efficient water treatment technology, which has the well prospect in the field of dealing with water pollution. The photoelectrocatalytic activity could be enhanced by the modification with metallic oxide on ordered TiO2 NTAs. In this paper, highly ordered MnO2/TiO2 NTAs and Ce O2/TiO2 NTAs were prepared by electrochemical anodization process, followed by electro–deposition process. The methyl orange(MO) degradation was used to investigate the PEC activities of the as–prepared photoelectrodes. The enhanced PEC mechanism of as–prepared photoelectrodes was investigated.Highly ordered MnO2/TiO2 NTAs and CeO2/Ti O2 NTAs were prepared by electro–deposition process. The effect of electro-deposition voltage parameters, deposition content, and calcinationed temperature on the crystal structure 、 light absorption capability and photoelectrocatalytic performance of as–prepared photoelectrodes were investigated. The results showed that the optimum preparation condition was a constant of 0.8 V for 3 min in a mixed electrolyte which containing 0.001 mol/L MnSO4 and 0.1 mol/L Na2SO4, then annealing at 450 ℃ for 120 min. While a 2.0 V applied potentials at a fixed 60 min of the 350 W Xenon lamp illuminationed, the degradation rate for MO could achieve 95.1%. The results showed CeO2/TiO2 NTAs the optimum preparation condition was a constant of 0.8 V for 15 min in a mixed electrolyte which containing 0.005 mol/L Ce(NO3)3·6H2O, then annealing at 450 ℃ for 120 min. While a 2.0 V applied potentials at a fixed 60 min of the 350 W Xenon lamp illuminationed, the degradation rate for MO could achieve 98.1%.As–prepared photoelectrodes and Pt were served as the cathode and anode, respectively. The photoelectrochemical(PECH) properties of the photoelectrodes were investigated and the generation of ?OH radicals. The results indicated that the transient photocurrent density and the potential of as–prepared photoelectrodes were larger than that of bare TiO2 NTAs, which could facilitate the separation of photogenerated charge carriers accelerated interfacial transfer of electrons and emerged the excellent PEC activity.