Enhancement of the Visible Light Photocatalytic Activity of C-Doped TiO2 Nanomaterials Prepared by a Green Synthetic Approach
Enhancement of the Visible Light Photocatalytic Activity of C-Doped TiO2 Nanomaterials Prepared by a Green Synthetic Approach
复制标题
绿色合成方法制备的碳掺杂二氧化钛纳米材料的可见光催化活性增强
DOI：
10.1021/jp111916q
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发表时间：
2011-07-14
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;Guo, Sen;Wu, Zhongbiao
首次以蔗糖为碳掺杂源，采用一锅法绿色合成方法制备了具有介孔结构的碳掺杂TiO 2纳米材料。采用简单的后热处理来提高所制备的光催化剂的可见光催化活性。通过气相甲苯的光降解实验证明了100 ~ 300 ℃后热处理的增强效果，最佳温度为200 ℃。通过X射线衍射、拉曼光谱、N-2吸附-脱附等温线、透射电子显微镜、傅里叶变换红外光谱、X射线光电子能谱、紫外-可见漫反射光谱和光致发光等手段对样品的理化性质进行了详细表征。结果表明，后热处理的促进作用是通过改变催化剂的表面性质和光学性质实现的。结果还表明，由于表面缺陷的减少，热处理后电子空穴对的复合被有效地抑制。由于其成本低、易于放大等优点，采用绿色方法制备碳掺杂二氧化钛纳米材料，其后热处理过程简单，为碳掺杂二氧化钛纳米材料的工业化应用提供了一条新的途径。
Mesoporous C-doped TiO2 nanomaterials with an anatase phase are 100 prepared by a one-pot green synthetic approach using sucrose as a carbon-doping source for the first time. A facile post-thermal treatment is employed to enhance visible light photocatalytic activity of the as-prepared photocatalyst. The enhancement effect of post-thermal treatment between 100 and 300 degrees C is proved by the photodegradation of gas-phase toluene, and the optimum temperature is 200 degrees C. Physicochemical properties of the samples are characterized in detail by X-ray diffraction, Raman spectroscopy, N-2 adsorption-desorption isotherms, transmission electron microscopy, Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, and photoluminescence. The results indicate that the promotive effect of the post-thermal treatment can be attributed to the changes of the catalysts' surface and optical properties. The results also show that the recombination of electron hole pairs is effectively inhibited after thermal treatment due to the reduction of surface defects. The facile post-thermal treatment provides a new route for potential industrial applications of C-doped TiO2 nanomaterials prepared by a green approach owing to its low cost and easy scale-up.