Preparation and photocatalytic properties of strontium titanate powders via sol-gel process
Preparation and photocatalytic properties of strontium titanate powders via sol-gel process
复制标题
DOI：
10.1016/j.jcrysgro.2008.09.185
复制
发表时间：
2009-01-15
影响因子：
1.8
通讯作者：
Yin, Shu
中科院分区：
文献类型：
--
作者：
Chen, Liang;Zhang, Shouchen;Yin, Shu
本课题组在前期工作的基础上，开发了一种新型的光催化剂，用于降解氮氧化物（NOx）。近年来，采用溶胶-凝胶法制备了钛酸锶（SrTiO_3）等一系列光催化剂，并对其光催化降解NO的活性进行了研究。采用差热分析、热重分析、X射线衍射和透射电镜对样品进行了表征。所制备的光催化剂具有完美的钙钛矿结构，当相应的溶胶-凝胶前驱体在600 ℃下煅烧时，可以获得纯净的样品。随着温度的升高，SrTiO 3样品的晶粒尺寸逐渐增大，结晶度逐渐提高。SrTiO 3的最佳合成被确定为700 ℃煅烧。实验结果表明，光源、煅烧温度等参数对设计的光催化反应有很大的影响，当NO浓度为716 mg/m3时，NO的降解率可提高到92%以上。(C)2008 Elsevier B. V.保留所有权利。
On the basis of our previous work, we developed a new type of catalyst (e.g. photocatalysts) to degradate nitrogen oxides (NOx) Recently, a series of photocatalysts Such as strontium titanate (SrTiO3) were prepared by sol-gel method, their photocatalytic activities of NO degradation were also studied. The obtained samples were characterized by differential thermal analysis and thermal gravimetric analysis, X-ray diffraction and transmission electron microscopy. The as-prepared photocatalysts have a perfect perovskite structure, and pure samples can be obtained when the corresponding sol-gel precursors were calcined at 600 degrees C in muffle. With the temperature increasing, the grain size of SrTiO3 samples grew large steadily and the crystallinity became better. The optimal synthesis of SrTiO3 was determined to be 700 degrees C calcination. Our current experiments indicated that some parameters such as lamp-house, calcinations temperature had a strong effect on the designed photoreaction, the concentration of nitric oxide at 716 mg/m(3), the degradation rate of nitric oxide can increase above 92%. (C) 2008 Elsevier B.V. All rights reserved.