Highly crystalline and silica-embedded titania rhombic shaped nanoparticles with mesoporous structure and its application in photocatalytic degradation of organic compound
Highly crystalline and silica-embedded titania rhombic shaped nanoparticles with mesoporous structure and its application in photocatalytic degradation of organic compound
复制标题
高结晶二氧化硅包埋菱形介孔二氧化钛纳米粒子及其在光催化降解有机化合物中的应用
DOI：
10.1016/j.matchemphys.2013.05.067
复制
发表时间：
2013-09
影响因子：
4.6
通讯作者：
Xiaoheng Liu
中科院分区：
文献类型：
--
作者：
Xiaxi Yao;Chunbao Zhao;Ru He;Xiaoheng Liu
以Ti（OC 4 H9）4为前驱体，乙酸为溶剂，Si（OC 2 H5）4（TEOS）为稳定剂，采用溶剂热法成功制备了具有介孔结构的高结晶度、二氧化硅嵌入的菱形二氧化钛纳米粒子。采用透射电子显微镜（TEM）、X射线衍射（XRD）、紫外-可见漫反射光谱、拉曼光谱、N2吸附-脱附等温线和X射线光电子能谱（XPS）等表征技术研究了SiO2/TiO 2复合材料的物理化学性质和形成过程。以亚甲基蓝（MB）染料为降解对象，研究了硅包埋二氧化钛光催化剂的光催化性能。结果表明，介孔二氧化硅嵌入的二氧化钛纳米晶体呈现菱形或截头菱形形状，并且具有260.7 m2 g-1的极高比表面积。所有的高结晶性和介孔二氧化硅嵌入的二氧化钛样品表现出更好的光催化活性比纯二氧化钛。当TEOS浓度为0.6 ml时，二氧化硅包埋的TiO 2纳米粒子的光催化活性最高，是纯TiO 2样品的6.7倍，是Degussa P25粉体的1.5倍。这是由于高结晶度，增加表面积嵌入无定形二氧化硅和适当的组装的二氧化钛纳米粒子。
Highly crystalline and silica-embedded titania rhombic shaped nanoparticles with mesoporous structure are successfully obtained via a facile solvothermal method using Ti(OC4H9)4as precursor, acetic acid as solvent and Si(OC2H5)4(TEOS) as stabilizer. Various characterization techniques, including Transmission electron microscopy(TEM), X-ray diffraction(XRD), UV–vis diffuse reflection spectroscopy, Raman spectroscopy, N2adsorption–desorption isotherms and X-ray photoelectron spectra (XPS), have been applied to investigate the physical–chemical properties and the formation process of silica-embedded titania. The photocatalytic performances of all the silica-embedded titania samples are also studied by the degradation of methylene blue (MB) dye under UV irradiation. The results indicate that the mesoporous silica-embedded titania nanocrystals exhibit rhombic or truncated rhombic shapes and have extremely high special surface area of 260.7 m2g−1. All the highly crystalline and mesoporous silica-embedded titania samples show better photocatalytic activity than that of the pure titania. The maximum photocatalytic activity is obtained on the silica-embedded titania nanoparticles with 0.6 ml TEOS, which is 6.7 times that achieved on the pure titania sample and 1.5 times that performed on the Degussa P25 powders. This is attributed to high crystallinity, increased surface area by embedding amorphous silica and proper assembly of TiO2nanoparticles.
登录
查看更多内容
影响因子：
3
作者：
Wei Wang;Chunhua Lu;Yaru Ni;Mingxing Su;Zhong-zi Xu
通讯作者：
Wei Wang;Chunhua Lu;Yaru Ni;Mingxing Su;Zhong-zi Xu
影响因子：
10.8
作者：
Mor, GK;Shankar, K;Grimes, CA
通讯作者：
Grimes, CA
影响因子：
29.4
作者：
H. Wu;H. Hng;X. Lou
通讯作者：
H. Wu;H. Hng;X. Lou
影响因子：
10.8
作者：
Barnard, AS;Curtiss, LA
通讯作者：
Curtiss, LA
影响因子：
3
作者：
Cheng, P;Zheng, MP;Gu, MY
通讯作者：
Gu, MY