TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Properties: The flaky titanium oxide nanotubes have pore size of 30-50 nm, wall thickness of 15-25 nm, and length of 750-800 nm. The particle diameter of tungsten trioxide nanoparticles is 5-10 nm. The deposition area of copper oxide nanoparticles is 0.4-0.6 mu m2. Preferred Process: The flaky titanium oxide nanotubes are prepared by ultrasonically cleaning titanium sheet using deionized water and ethanol, drying at room temperature, immersing dried sheet in etching solution containing mixed acid including hydrofluoric acid and nitric acid, washing immersed sheet using deionized water, drying, anodizing using obtained pure titanium sheet as a working electrode, and mixed solution containing 0.1-0.5 mol/l ammonium fluoride and 70-95 vol.% glycerol at 10-30 V, washing anodized titanium sheet using deionized water, drying, and calcining at 400-550 degrees C in a muffle furnace. Hydrogen peroxide and sodium tungstate are mixed in the volume ratio of 1:1-4:1, 30-50% isopropyl alcohol solution as a defoaming agent is added, reacted at room temperature, and pH of reaction mixture is adjusted to 1.1-1.3 using mixed solution of perchloric acid, to obtain peroxide-containing tungsten ion solution. Cathode deposition of tungsten trioxide nanoparticles on the surface of titanium dioxide nanotubes is performed using flaky titanium oxide nanotubes as cathode, platinum plate as anode, a saturated calomel electrode as reference electrode, obtained product is washed using deionized water, and dried, to obtain tungsten trioxide/titanium dioxide nanotubes. Potentiostatic energizing reaction of copper ions is performed using flaky titanium oxide nanotubes as a working electrode, platinum electrode as a counter electrode, calomel electrode as reference electrode, and mixed solution containing 0.3-0.6 mol/l copper acetate and 0.3-0.6 mol/l sodium acetate, obtained product is washed using deionized water, and dried to obtain copper ion-containing titanium dioxide nanotubes. The copper ion-containing titanium dioxide nanotubes are immersed in mixture of sodium and ammonium persulfate solution until the surface becomes blue color, washed using deionized water, dried, and calcined at 400-550 degrees C for 0.5-2 hours to obtain copper oxide/titanium dioxide nanotubes.