在0.5wt%NaF+1mol/L Na_2SO_4溶液中,20V电压下,通过阳极氧化的方法,在纯Ti片表面制备出与基底垂直、排列整齐有序的TiO_2纳米管,将制得的TiO_2纳米管在500℃、氨气的气氛下退火2h,然后,在0.5mol AgNO_3溶液中用12W的紫外灯照射24h,制备出Ag/TiO_(2-x)N_x纳米管,并用XRD,SEM和XPS进行表征.实验结果显示,在紫外光下,Ag/TiO_(2-x)N_x纳米管的光电催化降解效率比TiO_2纳米管的光电催化降解效率提高了39.68%;在可见光下,Ag/TiO_(2-x)N_x纳米管的光电催化降解效率比TiO_(2-x)N_x纳米管可见光光电催化的降解效率提高了12%.可见光光电催化16h后,初始浓度为10×10~(-6)mol/L的亚甲基蓝降解率达到50.53%.
High density, well ordered, vertically aligned and uniform titanium oxide nanotube arrays were fabricated on the surface of pure titanium sheet by direct electrochemical anodic oxidation under 20V in elec-trolyte of 0.5wt% NaF + lmol/L Na_2SO_4. Then TiO_2 nano-tube array were annealed in ammonia for 2h, Ag nano-particles were deposited photocatalytically on the N-doped TiO_2 nano-tube surface. XRD, SEM and XPS techniques were used to characterize titanium oxide nanotube arrays. Results show that photoelectron-degradation efficiency of Ag/TiO_(2-x)N_x nano-tubes under UV-light is about 39.68% higher than that of TiO_2 nano-tubes; and photoelectro-degradation efficiency of Ag/TiO_(2-x)N_x, nano-tubes under visible light is 12% higher than that of TiO_2 nano-tubes. After photoelectron-degradation under visible hight for 16h, the degra-dation rate of mathylene blue with initial concentration of 10 × 10~(-6)mol/L is 50.53%.
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