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| Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响 | |
| 引用本文： | 黄海凤,贾建明,卢晗锋,张宏华,潘烈群. Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响[J]. 物理化学学报, 2013, 29(6): 1319-1326. DOI: 10.3866/PKU.WHXB201304012 |
| 作者姓名： | 黄海凤 贾建明 卢晗锋 张宏华 潘烈群 |
| 作者单位： | 1.College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China;2.Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China;3.Environmental Monitoring Station of Fuyang City, Fuyang 311400, Zhejiang Province, P. R. China |
| 基金项目： | 国家自然科学基金(21107096)资助项目~~ |
| 摘 要： | 通过分步沉积法制备了不同Zr/Ti 摩尔比的锶锆钛(SZT)复合氧化物催化剂, 以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见(UV-Vis)漫反射光谱等表征手段考察不同Zr/Ti 摩尔比下SZT催化剂的结构形态, 以可见光下光催化降解亚甲基蓝为模型反应考察样品的光催化活性. 结果表明: Zr/Ti 摩尔比<1 时SZT催化剂发生Zr4+与Ti4+同质替换, 引起晶格缺陷, 光催化活性小幅提高; Zr/Ti 摩尔比≥1 时SZT催化剂产生SrZrO3/TinO2n-1 (n=4, 9)的新晶相, TinO2n-1 (n=4, 9)的存在有利于光生电子-空穴的传导与分离, 可大幅提高催化剂光催化活性. 其中, SZT-5/5 表现出最高的光催化活性, 其一级反应速率常数达到0.2133 min-1, 是同等光照条件下纯SrTiO3样品(0.0158 min-1)的13.5倍. |
| 关 键 词： | 可见光 锶锆钛复合氧化物 Zr/Ti 摩尔比 光催化降解 亚甲基蓝 |
| 收稿时间： | 2012-11-20 |
| 修稿时间： | 2013-04-01 |
Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light |
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| HUANG Hai-Feng,JIA Jian-Ming,LU Han-Feng, ZHANG Hong-Hua,PAN Lie-Qun. Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light[J]. Acta Physico-Chimica Sinica, 2013, 29(6): 1319-1326. DOI: 10.3866/PKU.WHXB201304012 | |
| Authors: | HUANG Hai-Feng JIA Jian-Ming LU Han-Feng ZHANG Hong-Hua PAN Lie-Qun |
| Affiliation: | 1.College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China;2.Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China;3.Environmental Monitoring Station of Fuyang City, Fuyang 311400, Zhejiang Province, P. R. China |
| Abstract: | A series of Sr-Zr-Ti (SZT) mixed oxide catalysts were prepared by a fractional-precipitation method. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and ultraviolet visible (UV-Vis) diffuse reflectance absorption spectra. Photocatalytic degradation of methylene blue was investigated to determine the photoactivity of the catalyst. It was shown that with a Zr/Ti ratio<1, the SZT mixed oxide catalysts showed improved photocatalytic activity. This was attributed to lattice defects creating active photocatalytic sites because of Zr4+ doping. For Zr/Ti ratios ≥1, the catalysts showed markedly improved photocatalytic activity because of new crystalline phases of SrZrO3 and TinO2n-1 (n=4, 9)that facilitated splitting and conduction for electron/hole. Typical SZT samples (Zr/Ti=4) showed the highest photocatalytic activity, with first-order reaction rate constant 13.5 times that of a SrTiO3 sample. |
| Keywords: | Visible light Sr-Zr-Ti mixed oxide Zr/Ti molar ratio Photocatalytic degradation Methylene blue |
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