In this experiment, CuO/Ag co-deposition TiO nanotube array (CuO-Ag-TNT) film was prepared on pure Ti substrate with the method of combining anodic oxidation and electrodeposition by pulse-reversing voltage power supply in the electrolyte of NHF, ethylene glycol, CuNO · 3HO and AgNO. The morphology, phase, chemical composition, photocatalytic property and mechanism of the nanotube array film were studied by means of scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy, UV-vis diffuse reflectance spectra, photoluminescence and photocatalytic degradation under visible light. The results showed that the depositional CuO and Ag existed in two forms, being the small-particle dispersion and large-particle sedimentary phase in the nanotube arrays: CuO-Ag-TNTs for different doping amounts of Ag could be prepared by adjusting the concentration of AgNO and the reverse voltages; with changing of the doping amount of Ag, the band gap and photo-generated electron-hole pair recombination rate also changed, and under the conditions of annealing and the optimized process parameter, the band gap of the nanotube arrays narrowed 0.49 eV and the rate of electron and pair recombination decreased noticeably; the nanotube array film for the concentration of 0.5 cm ml degraded the methylene blue of 8 mg L, and the degradation rate reached above 98%. The co-deposition CuO-Ag-TNT film prepared by the one-step method performed well in the field of photocatalysis under visible light.

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ZnO/Ag multi-phase composited TiO 2 nanotube arrays (TiO 2 TNAs) films were prepared on pure Ti substrate through one-step anodizing method using double pulse plating power supply. The deposition amount of Ag and ZnO were adjusted by changing the concentration of Zn(NO 3 ) 2 • 6H 2 O and AgNO 3 and reverse voltage. The results showed that ZnO deposited in the wall of TiO 2 NTAs dispersedly; sedimentary phase and dispersed phase are the two forms of deposited Ag in TiO 2 NTAs. The bandgap narrowed 0.33 eV, and the recombination rate of photo-generated electron-hole pairs also decreased obviously due to the doping energy level synergistic effect of ZnO and the Surface Plasmon Resonance (SPR) effect of Ag. Furthermore, the sample with 1 mM ZnO+0.4 mM Ag and 5 V reverse voltage has the best photocatalytic properties, the degradation rate of Methylene blue (MB) reached 86% which improved 15% compared with undoped TiO 2 NTAs.

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