Photocatalytic properties of phosphor-doped titania nanoparticles
Photocatalytic properties of phosphor-doped titania nanoparticles
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DOI：
10.1016/j.apcatb.2007.03.016
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发表时间：
2007-08
影响因子：
22.1
通讯作者：
L. Lin;Wei Lin;J. Xie;Y. X. Zhu;Bi-ying Zhao;You-chang Xie
中科院分区：
文献类型：
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作者：
L. Lin;Wei Lin;J. Xie;Y. X. Zhu;Bi-ying Zhao;You-chang Xie
以次磷酸为前驱体，采用改进的溶胶-凝胶法制备了磷掺杂二氧化钛纳米粒子。采用差热-热重分析（DTA-TG）、高分辨透射电子显微镜（HRTEM）、X射线衍射（XRD）、77 K氮气物理吸附、X射线光电子能谱（XPS）、傅立叶变换红外光谱（FT-IR）、吡啶吸附光谱（FT-IR）和紫外-可见光谱（UV-vis）等手段对材料进行了表征。结果表明，磷掺杂的物种可以显着增加材料的表面积，从而使它们的表面羟基含量更高。此外，磷的掺杂提高了二氧化钛的热稳定性，并在一定程度上减少了金红石向金红石的相变。紫外-可见光谱表明，荧光粉的修饰使二氧化钛的吸收边向可见光区移动，使其成为可见光区的有效光催化剂。这通过在可见光（> 400 nm）照射下MB和4CP的降解来证明。与纯TiO 2相比，掺磷TiO 2具有优异的光催化活性，其原因在于掺磷TiO 2具有高的比表面积和较小的晶粒尺寸。
Phosphor-doped titania nanoparticles in an anatase phase were prepared by a simple modified sol–gel method with hypophosphorous acid as a precursor. The resulting materials were characterized by differential thermal analysis-thermogravimetry (DTA-TG), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), nitrogen physical adsorption at 77K, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), FT-IR pyridine adsorption spectroscopy, and UV–vis spectroscopy. It was found that the phosphor-doped species could significantly increase the surface area of the materials, and consequently gave them a higher content of surface hydroxyl groups. Moreover, the phosphor-doping improved the thermal stability of titania and decreased the phase transformation of anatase to rutile to a certain extent. UV–vis spectra proved that the modification by phosphor shifted the absorption edge of titania to the visible region, making it an effective photocatalyst in visible light. This was demonstrated by the degradation of MB and 4CP under visible-light (>400nm) irradiation. The excellent photocatalytic activity of phosphor-doped titania compared with pure titania could be explained by its high surface area and small crystallite size.