N、In共掺杂TiO_2光催化剂制备及性能

室温下,以尿素、硝酸铟为前驱体,采用超声化学法制备N、In共掺杂TiO_2光催化剂,并用X射线衍射仪、傅里叶红外光谱仪、X射线光电子能谱仪、扫描电子显微镜、紫外-可见漫反射分光光度计等对其进行表征。以罗丹明B(RhB)为污染物,考察其在太阳光照射下催化活性。结果表明,所制备的TiO_2催化剂均为锐钛矿;N和In进入TiO_2的晶格,分别以O-Ti-N和Ti-O-In形式存在,使禁带宽度变窄,光量子效率提高,光催化活性增强。N和In共掺杂使TiO_2光吸收发生红移,拓宽了可见光响应范围。在太阳光照射下,6 h后RhB的降解率达到100%。

Preparation and Properties of TiO_2 Photocatalyst Co-doped with Nitrogen and Indium

The TiO2 photocatalyst co-doped with nitrogen and indium was prepared via a sonochemical method using urea and indium nitrate as precursors at room temperature. The photocatalysts were characterized by X-ray diffraction(XRD), fourier transform infrared spectroscopy(FT IR), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM) and UV-vis diffuse reflectance spectra(UV-vis DRS). The photocatalytic activities were tested on the degradation of Rhodamine B(RhB) under sunlight irradiation. The results showed that all the prepared TiO2 catalyst were anatase.The nitrogen and indium atoms were incorporated into the crystal structure of titania to form O-Ti-N and Ti-O-In linkage, which could narrow the band gap energy, increase the photo quantum efficiency and enhance of photocatalytic performance. Furthermore, the optical absorption edge of N-In/TiO2 showed a red shift that played a crucial role in the photocatalytic activity under abundant sunlight. The degradation rate of the Rh B by N-In/TiO2 catalyst reached 100% under sunlight irradiation after 6 h.