Synthesis, characterization and photocatalytic activity of NaNbO3/ZnO heterojunction photocatalysts

Synthesis, characterization and photocatalytic activity of NaNbO3/ZnO heterojunction photocatalysts
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NaNbO3/ZnO异质结光催化剂的合成、表征及光催化活性

DOI:
10.1016/j.jallcom.2011.06.100
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发表时间:
2011-09
影响因子:
6.2
通讯作者:
Xiangyang Wu
Xiangyang Wu
中科院分区:
材料科学2区
文献类型:
--
作者:
Hui Xu;Chengtang Liua,;Huaming Li;Yuanguo Xu;Jiexiang Xia;Sheng Yina,;Ling Liu;Xiangyang Wu

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采用水热法合成了一系列NaNbO3/ZnO杂电结构。采用x射线粉末衍射(XRD)、扫描电子显微镜(SEM)、能量色散x射线能谱仪(EDS)、透射电子显微镜(TEM)、x射线光电子能谱(XPS)、漫反射能谱(DRS)等表征方法对其结构、形貌和光催化性能进行了研究。通过对亚甲基蓝染料的降解评价了催化剂的光催化活性,当nanbo3的含量为10wt.%时,光催化效率最高。讨论了异质结的光催化机理。光激发电子和空穴的有效转化限制了电荷的重组,这被认为是高光催化活性的主要原因。
A series of NaNbO3/ZnO heteronanostructures were synthesized with the hydrothermal method. Various characterization methods such as X-ray powder diffraction (XRD), scanning electronic microscope (SEM) and energy dispersive X-ray spectrometer (EDS), transmission electron microscope (TEM), X-ray photoelectron spectra (XPS) and diffuse reflectance spectra (DRS) were employed to investigate the structure, morphology and photocatalytic properties. The photocatalytic activity of the catalysts was evaluated by the degradation of methylene blue dye and the highest photocatalytic efficiency was observed when the content of NaNbO3was 10wt.%. The photocatalytic mechanism of the heterojunction was also discussed. The effective transformation of the photoexcited electron and holes restricted the recombination of charges, which was regarded as the main reason of the high photocatalytic activity.
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