期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 183, 期 -, 页码 308-316出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.10.048
关键词
Modular calcination; N-doped TiO2; Benzene; Visible light; Superoxide anion radical
资金
- Graduate Student's Entrepreneurial Innovation Fund of Huazhong University of Science and Technology [2015650011]
- National Basic Research Program of China [2009CB939705]
In this paper, a highly active modified N-doped TiO2 nanoparticle is prepared by a novel modular calcination method. The combination among ammonia, hydrogen, air and vacuum module is investigated comprehensively. Moreover, the effect of calcination order on photocatalytic activity is also studied. The photocatalytic property of sample annealed in ammonia firstly is better than that of the sample annealed in ammonia last. NV-TiO2 sample which is prepared by combination between ammonia and vacuum module possesses the highest photocatalytic activity towards benzene. The photodegradation result shows that 300 ppm benzene can be decomposed completely during four hour visible light illumination. The excellent photocatalytic performance is attributed to the improvement of light harvesting, charge separation and increased surface electron scavenger, simultaneously. Besides, the photocatalytic degradation reaction path of benzene demonstrates that phenol is an important intermediate product. The faster decomposition of phenol is corresponded to higher photocatalytic reaction rate. In fact, the effect of calcination order on the photocatalytic activity is embodied in differences of the amount of oxygen vacancy and surface cleanliness. These findings aid us to prepare highly efficient visible light active photocatalyst by using a simple method and deepen the understanding on the mechanism of decomposing benzene. (C) 2015 Elsevier B.V. All rights reserved.
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