Nb2O5/TiO2 heterojunctions: Synthesis strategy and photocatalytic activity

详细信息    查看全文

• 作者：Junqing Yan ; Guangjun Wu ; Naijia Guan ; Landong Li ; ^{lild@nankai.edu.cn" class="auth_mail}
• 关键词：Nb2O5/TiO2 ; Heterojunction ; In situ hydrolysis-loading ; Photocatalysis
• 刊名：Applied Catalysis B: Environmental
• 出版年：25 June, 2014
• 年：2014
• 卷：152-153
• 期：Complete
• 页码：280-288
• 全文大小：2044 K

文摘

In the present study, in situ hydrolysis-loading of ultra-fine niobium oxide nanoparticles on the surface of rutile TiO₂ is developed as a new strategy to synthesize Nb₂O₅/TiO₂ heterojunctions. The physico-chemical properties of Nb₂O₅/TiO₂ heterojunctions are fully characterized by X-ray diffraction, Raman, UV-vis, X-ray photoelectron spectroscopy and transmission electron microscopy. The separation efficiency of photo-generated electron-hole pairs on Nb₂O₅/TiO₂ heterojunctions under irradiation is investigated by photoluminescence and electron spin resonance spectroscopy. The activity of Nb₂O₅/TiO₂ heterojunctions is examined in the selective photocatalytic oxidation of 伪-phenylethanol and the photocatalytic reforming of methanol. In both reactions, Nb₂O₅/TiO₂ heterojunctions exhibit distinct higher photocatalytic activity than pure rutile TiO₂ or Nb₂O₅. The photocatalytic activity of Nb₂O₅/TiO₂ heterojunctions is relevant with Nb/Ti ratio and the optimal activity is obtained at Nb/Ti = 0.12 with the highest separation efficiency of photo-generated electron-hole pairs. Integrating the physico-chemical and photocatalytic properties, the factors controlling the photocatalytic activity of Nb₂O₅/TiO₂ heterojunctions are discussed in detail.