Nb2O5/TiO2 heterojunctions: Synthesis strategy and photocatalytic activity

被引：227
作者：
Yan, Junqing [1 ]
Wu, Guangjun [1 ]
Guan, Naijia [1 ]
Li, Landong [1 ]
机构：
[1] Nankai Univ, Coll Chem, Key Lab Adv Energy Mat Chem, Minist Educ, Tianjin 300071, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2014年 / 152卷
关键词：
Nb2O5/TiO2; Heterojunction; In situ hydrolysis-loading; Photocatalysis; HYDROGEN-PRODUCTION; TITANIUM-DIOXIDE; TIO2; WATER; EFFICIENT; OXIDE; PHOTOANODE; DEPOSITION; PARTICLES; AG3PO4;
D O I：
10.1016/j.apcatb.2014.01.049
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 physicochemical 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 ot-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. (C) 2014 Elsevier B.V. All rights reserved.
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页码：280 / 288
页数：9
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