文献类型：期刊文献

英文题名：Effect of synergy on the visible light activity of B, N and Fe co-doped TiO2 for the degradation of MO

作者：Xing, Mingyang[1]; Wu, Yongmei[1]; Zhang, Jinlong[1]; Chen, Feng[1]

机构：[1] Key Lab. for Advanced Materials, Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

年份：2010

卷号：2

期号：7

起止页码：1233

外文期刊名：Nanoscale

收录：EI(收录号：20102913082456)

语种：英文

外文关键词：Boron - Catalysts - Conduction bands - Crystal impurities - Electron mobility - Irradiation - Photodegradation - Spectroscopy - Titanium dioxide - X ray diffraction - X ray photoelectron spectroscopy

摘要：Single doped, co-doped and tri-doped TiO2 with B, N and Fe are successfully synthesized by using the hydrothermal method. The samples are characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples are evaluated for degradation of methyl-orange (MO, 20 mg L-1) in aqueous solutions under visible light (λ > 420 nm). The results of XRD suggest that all the catalysts present anatase crystal. All the doping catalysts show higher photoactivities than pure TiO2 under visible light irradiation. In the single nonmetal doped TiO2, the localized dopant levels near the valence band (VB) are responsible for the enhancement of photoactivies. Fe3+ impurity level formed under the conduction band (CB) induces the high photocatalytic activities of iron doped TiO2. In the co-doped and tri-doped catalysts, the B 2p and N 2p acceptor states contribute to the band gap narrowing by mixing with O 2p states combined with the overlapping of the conduction band by the iron "d" orbital, resulting in improvement of the photo-performance under visible light irradiation. Iron co-doped with boron catalyst shows low photoactivity under visible light due to the absence of Fe3+ impurity levels at the bottom of the conduction band. In addition, the XPS results indicate the presence of synergistic effects in co-doped and tri-doped catalysts, which contribute to the enhancement of photocatalytic activities. ? The Royal Society of Chemistry 2010.