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以纳米二氧化钛(TiO_2,P25)为原料,通过水热法合成TiO_2纳米管,同时,采用光沉积法将金属金(Au)或铂(Pt)负载于所合成的TiO_2纳米管上,并对其进行了光催化性能的研究。用X射线粉末衍射仪、透射电子显微镜、紫外-可见分光光度计和比表面积法与孔径测定等仪器和方法对合成的样品进行表征。结果表明:合成出管径均匀且比表面积大于400m~2/g的TiO_2纳米管。热处理结果表明:随着焙烧温度的增加,样品的比表面积减小。在焙烧过程中,TiO_2的晶型由锐钛矿型向金红石型转变,TiO_2纳米管的光催化活性高于P25纳米TiO_2的。负载Au,Pt后,TiO_2纳米管的光催化活性明显增加,且负载Au的样品在可见光区出现明显吸收峰,表明负载Au的TiO_2纳米管有望成为可见光光催化剂。
TiO 2 nanotubes were synthesized by hydrothermal method using TiO 2 and P 25 as raw materials. At the same time, metal Au or Pt was deposited on the synthesized TiO 2 nanotubes by photo-deposition method. The photocatalytic performance was studied. The synthesized samples were characterized by X-ray powder diffraction, transmission electron microscopy, ultraviolet-visible spectrophotometer and specific surface area and pore size determination. The results show that TiO 2 nanotubes with uniform diameter and specific surface area greater than 400 m 2 / g are synthesized. The results of heat treatment show that the specific surface area of the sample decreases with the increase of calcination temperature. During the calcination process, the crystal form of TiO_2 changed from anatase to rutile, and the photocatalytic activity of TiO_2 nanotubes was higher than that of P25 TiO_2. The photocatalytic activity of TiO 2 nanotubes increased obviously after loading Au and Pt, and the samples with Au loading showed obvious absorption peaks in the visible light region, indicating that the TiO 2 nanotubes loaded with Au are expected to become visible light photocatalysts.