可见光响应Cr，N-共掺杂钛酸盐纳米管的水热法合成及表征

SYNTHESIS AND CHARATERIZATION OF Cr, N-CODOPED TITANATE NANOTUBES WITH VISIBLE LIGHT RESPONSE

以低温溶剂热法合成的Cr，N-共掺杂的TiO2为前驱体，采用水热法合成了可见光响应Cr，N-共掺杂钛酸盐纳米管；采用XRD、TEM、BET等手段对其结构进行了表征，并采用XPS、UV-vis等手段对Cr、N的存在方式和样品的可见光响应进行了测定。结果表明，采用这种方法合成的可见光响应Cr，N-共掺杂钛酸盐纳米管具有6～7nm的均-孔径和较大的比表面积（400m2／g），并且具有钛酸盐的典型结构特征；Cr和N分别以Cr（Ⅲ）和O-Ti—N的状态存在；合成的样品具有比离子交换法和未交换样品更强的可见光响应。

Cr, N-codoped tiatanate nanotubes with visible-light response were synthesized by hydrothermal process by using Cr,N-codoped TiO2 as precursor. The as-synthesized sample was characterized by XRD, TEM, BET, XPS and UV-vis to obtain the physical properties, the state of the Cr and N and the intensity of visible light response. It is confirmed from the XRD, TEM, BET results that the as-synthesized sample showed high quality uniform pore size of 10 nm and high BET surface of 400 m2/g. The result of the XPS showed the Cr presented as Cr（ Ⅲ ） meanwhile the N presented as O^Ti-N in the titanate nanotubes. From the UV-vis spectra, it was detected that the Cr,N-codoped tiatanate nanotubes showed higher visible-light response than that of the Cr exchanged titanate nanotuhes.