Zn-doped TiO2 nanoparticles with high photocatalytic activity synthesized by hydrogen–oxygen diffusion flame

Zn-doped TiO2 nanoparticles with high photocatalytic activity synthesized by hydrogen–oxygen diffusion flame
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氢氧扩散焰合成的具有高光催化活性的Zn掺杂TiO2纳米粒子

DOI:
10.1016/j.apcatb.2007.09.044
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发表时间:
2008-03
期刊:
Applied Catalysis B: Environmental
影响因子:
--
通讯作者:
Zhao, Yin
Zhao, Yin
中科院分区:
其他
文献类型:
--
作者:
Du, H. L.;Shi, Liyi;Gu, Feng;Liu, Xiuhong;Li, Chunzhong;Zhao, Yin

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采用氢氧扩散火焰法合成了具有高光催化活性的Zn掺杂TiO2纳米粒子,并阐述了可见光照射下光催化降解罗丹明B染料的机理。 Zn掺杂剂以小的ZnO核的形式呈现,随机分散在锐钛矿型TiO2纳米粒子的表面。研究发现,掺杂适量的Zn可以增强光敏降解活性。 Zn掺杂提高的活性可归因于ZnO与染料激发态之间适当的能量位置,通过捕获电子增强了电子注入TiO2导带,从而促进了活性氧的形成。因此,可以实现可见光照射下染料的增强光降解。
Zn-doped TiO2nanoparticles with high photocatalytic activity were synthesized by the hydrogen–oxygen diffusion flame method and the photocatalytic degradation mechanism of rhodamine B dye under visible light irradiation were elaborated. The Zn dopants presented in the form of small ZnO nuclei dispersing randomly on the surface of anatase TiO2nanoparticles. It is found that the photosensitized degradation activity can be enhanced by doping an appropriate amount of Zn. The improved activity by Zn doping can be attributed to the appropriate energetic position between ZnO and the excited state of dye, which enhanced the electron injection into the conduction band of TiO2by capturing electron, subsequently promoted the formation of reactive oxygen species. Hence, the enhanced photodegradation of dyes under visible irradiation can be realized.
DOI: 10.1016/0927-0248(94)00208-8
发表时间: 1995
影响因子: 6.9
作者:
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DOI: --
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