One-Step "Green" Synthetic Approach for Mesoporous C-Doped Titanium Dioxide with Efficient Visible Light Photocatalytic Activity
One-Step "Green" Synthetic Approach for Mesoporous C-Doped Titanium Dioxide with Efficient Visible Light Photocatalytic Activity
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DOI：
10.1021/jp9049654
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发表时间：
2009-09-24
影响因子：
3.7
通讯作者：
Wu, Zhongbiao
中科院分区：
文献类型：
--
作者：
Dong, Fan;Wang, Haiqiang;Wu, Zhongbiao
首次以廉价的无机Ti（SO 4）2和葡萄糖为前驱体，采用“绿色”一步合成法合成了具有介孔结构的碳掺杂二氧化钛纳米材料。这种简便的方法避免了在高温下处理，使用昂贵或不稳定的前体，以及在合成过程中产生不期望的副产物。采用X射线衍射（XRD）、拉曼光谱（拉曼）、N-2吸附-脱附等温线、透射电子显微镜（TEM）、傅立叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、热重分析（TG）、紫外-可见漫反射光谱（UV-vis DRS）和光致发光（PL）等手段对样品的理化性质进行了表征。结果表明，TiO 2晶格中的氧位被碳原子取代，形成了全部的O-Ti-C键。观察到的新的电子状态以上的价带边缘是直接负责的电子起源的带隙变窄和可见光的光活性的C-掺杂的TiO 2。此外，还讨论了碳掺杂TiO 2介孔材料的可能形成机理。与商用TiO 2光催化剂（P25）和固相法制备的C掺杂TiO 2相比，所制备的C掺杂TiO 2在气相中对甲苯的可见光催化降解中表现出优异的活性。有效的活性可以归因于大的表面积和孔体积。我们的新合成方法是节能的，环境友好的，这可以提供一个有效的方法，工业应用，由于其成本低，易于放大。
Mesoporous C-doped TiO2 nanomaterials with anatase phase are synthesized by a one-step "green" synthetic approach with low-cost inorganic Ti(SO4)(2) and glucose as precursors for the first time. This facile method avoids treatment at high temperature, use of expensive or unstable precursors, and production of undesirable byproducts in the synthesis process. The physicochemical properties of as-prepared samples are characterized in detail by X-ray diffraction (XRD), Raman spectroscopy (Raman), N-2 adsorption-desorption isotherms, transmission electron microscopy (TEM), Fourier transform-infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TG), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and photoluminescence (PL). The results indicate that oxygen sites in the TiO2 lattice are substituted by carbon atoms and ail O-Ti-C bond is formed. The observed new electronic states above the valence band edge are directly responsible for the electronic origin of the band gap narrowing and visible light photoactivity of the C-doped TiO2. Furthermore, the possible formation mechanism of mesoporous C-doped TiO2 is also discussed. The as-prepared C-doped TiO2 exhibits excellent visible light photocatalytic activity in degradation of toluene in the gas phase compared with that of commercial TiO2 photocatalyst (P25) and C-doped TiO2, prepared by the solid state method. The efficient activity can be attributed to the large surface area and pore volume. Our novel synthesis approach is energy-efficient, and environmentally friendly, which can provide an effective approach for industrial applications owing to its low cost and easy scaling up.