Synthesis and Studies of the Visible-Light Photocatalytic Properties of Near-Monodisperse Bi-Doped TiO2 Nanospheres
Synthesis and Studies of the Visible-Light Photocatalytic Properties of Near-Monodisperse Bi-Doped TiO2 Nanospheres
复制标题
近单分散双掺杂TiO2纳米球的合成及可见光光催化性能研究
DOI：
10.1002/chem.200901193
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发表时间：
2009-01-01
影响因子：
4.3
通讯作者：
Xie, Tengfeng
中科院分区：
文献类型：
--
作者：
Li, Haiyan;Wang, Dejun;Xie, Tengfeng
通过在反应体系中加入不同量的五水硝酸铋，然后进行焙烧，制备了粒径在147~87 nm范围内几乎均匀的近单分散的铋掺杂锐钛矿型二氧化钛纳米球。X射线衍射、紫外-可见漫反射光谱和X射线光电子能谱证实了掺杂离子替代了部分晶格钛原子，并且Bi3+和Bi4+共存。在可见光(波长420 nm)照射下，铋掺杂的二氧化钛样品对罗丹明B(RhB)的降解表现出比纯二氧化钛更好的光催化活性，有趣的是，发现其降解机理与其他地方已有报道的传统机理不同。本文对其具体作用机理进行了探讨。
Near-monodisperse Bi-doped anatase TiO2 nanospheres with almost uniform diameters in the range of 147 to 87 nm were prepared simply by introducing different amounts of bismuth nitrate pentahydrate into the reaction system and Subsequent calcinations. Xray diffraction, UV-visible diffuse reflectance spectra, and X-ray photoelectron spectroscopy confirm that the doped ions substitute some of the lattice titanium atoms, and furthermore, Bi3+ and Bi4+ ions coexist. All the Bi-doped TiO2 samples show much better photocatalytic activity than pure TiO2 in the degradation of rhodamine B (RhB) under the irradiation of visible light (lambda > 420 nm), and, interestingly, it was found that the degradation mechanism is different from the conventional one, which has already been reported elsewhere. The detailed mechanism is discussed in this article.