Synthesis of Bi‐doped TiO2 Nanotubes and Enhanced Photocatalytic Activity for Hydrogen Evolution from Glycerol Solution
Synthesis of Bi‐doped TiO2 Nanotubes and Enhanced Photocatalytic Activity for Hydrogen Evolution from Glycerol Solution
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DOI：
10.1002/cjoc.201201151
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发表时间：
2013-03
影响因子：
5.4
通讯作者：
Wenxi Zhao;Xitao Wang;H. Sang;Kang Wang
中科院分区：
文献类型：
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作者：
Wenxi Zhao;Xitao Wang;H. Sang;Kang Wang
采用水热法在10 mol·L−1 NaOH（aq.）以传统溶胶-凝胶法制备的Bi掺杂TiO 2颗粒为原料。研究了Bi含量对TiO 2纳米管的形貌、织构、光吸收和光催化活性的影响。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对样品进行了表征，结果表明，样品中形成了氧化态高于Bi 3+的Bi掺杂钛酸盐纳米管结构。Bi掺杂的TiO 2纳米管表现出光吸收扩展到可见光区，并提高了光催化活性，从甘油/水的混合溶液相比，纯TiO 2纳米管的制氢。Bi掺杂存在一个最佳掺量，高掺量的Bi会阻碍钛酸盐向钛酸盐的相变，导致纳米管向纳米带的形态转变，从而降低光催化制氢活性。
Bi-doped TiO2 nanotubes with variable Bi/Ti ratios were synthesized by hydrothermal treatment in 10 mol·L−1 NaOH (aq.) through using Bi-doped TiO2 particles derived from conventional sol-gel method as starting materials. The effects of Bi content on the morphology, textural properties, photo absorption and photocatalytic activity of TiO2 nanotubes were investigated. The scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) observations of the obtained samples revealed the formation of titanate nanotube structure doped with Bi, which exists as a higher oxidation state than Bi3+. Bi-doping TiO2 nanotubes exhibited an extension of light absorption into the visible region and improved photocatalytic activities for hydrogen production from a glycerol/water mixed solution as compared with pure TiO2 nanotubes. There was an optimal Bi-doped content for the photocatalytic hydrogen production, and high content of Bi would retard the phase transition of titanate to anatase and result in morphology change from nanotube to nanobelt, which in turn decreases the photocatlytic activity for hydrogen evolution.