Hierarchical nitrogen doped bismuth niobate architectures: Controllable synthesis and excellent photocatalytic activity

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• 作者：Jungang Hou ; ^{lorinhjg@yahoo.com.cn} ; Rui Cao ; Zheng Wang ; Shuqiang Jiao ; ^{sjiao@ustb.edu.cn} ; Hongmin Zhu
• 关键词：Nitrogen doped ; Bismuth niobate ; Architectures ; Visible-light ; Photocatalyst
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 May, 2012
• 卷：217-218
• 期：Complete
• 页码：177-186
• 文件大小：2349 K

摘要

Nitrogen doped bismuth niobate (N-Bi₃NbO₇) hierarchical architectures were synthesized via a facile two-step hydrothermal process. XRD patterns revealed that the defect fluorite-type crystal structure of Bi₃NbO₇ remained intact upon nitrogen doping. Electron microscopy showed the N-Bi₃NbO₇ architecture has a unique peony-like spherical superstructure composed of numerous nanosheets. UV-vis spectra indicated that nitrogen doping in the compound results in a red-shift of the absorption edge from 450 nm to 470 nm. XPS indicated that [Bi/Nb]N bonds were formed by inducing nitrogen to replace a small amount of oxygen in Bi₃NbO_7鈭?em>xN_x, which is explained by electronic structure calculations including energy band and density of states. Based on observations of architectures formation, a possible growth mechanism was proposed to explain the transformation of polyhedral-like nanoparticles to peony-like microflowers via an Ostwald riping mechanism followed by self-assembly. The N-Bi₃NbO₇ architectures due to the large specific surface area and nitrogen doping exhibited higher photocatalytic activities in the decomposition of organic pollutant under visible-light irradiation than Bi₃NbO₇ nanoparticles. Furthermore, an enhanced photocatalytic performance was also observed for Ag/N-Bi₃NbO₇ architectures, which can be attributed to the synergetic effects between noble metal and semiconductor component.