Controlled fabrication of ordered mesoporous titania/carbon fiber composites with high photoactivity: Synergistic relationship between surface adsorption and photocatalysis
Controlled fabrication of ordered mesoporous titania/carbon fiber composites with high photoactivity: Synergistic relationship between surface adsorption and photocatalysis
复制标题
具有高光活性的有序介孔二氧化钛/碳纤维复合材料的受控制造：表面吸附与光催化之间的协同关系
DOI：
10.1016/j.cej.2013.12.050
复制
发表时间：
2014-05
影响因子：
15.1
通讯作者：
Shaohua Tang
中科院分区：
文献类型：
--
作者：
Peng Xu;Ming Li;Mengxiong Zen;Shaohua Tang
以液晶为软模板，采用超临界沉积法制备了碳纤维负载有序介孔TiO 2（OMPT/CFs）。采用扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和氮吸附法对OMPT/CF进行表征，并以酸性橙子7（AO 7）水溶液为降解对象，研究了其光催化活性。结果表明，OMPT分散在碳纤维上，其晶粒尺寸为10-20 nm，孔径为2-5 nm。虽然随着TiO 2涂层量的增加，OMPT/CFs的比表面积相对于CFs的比表面积减小，但由于二氧化钛的介观结构特征，具有最大TiO 2含量的OMPT/CFs-n（n= 3）（用于制备复合材料的沉淀/干燥循环数）仍然具有538.6m2/g的比表面积。与P25、纯OMPT和OMPT-CF混合物相比，OMPT/CF对AO 7的光催化降解表现出较高的活性。这种活性促进了表面吸附特性和光催化潜力之间的协同关系。由于负载量和比表面积对光催化效率的相互制约，OMPT/CFs-2降解AO 7的最佳负载量为15.2wt%。光催化行为可用改进的Langmuir-Hinshelwood模型描述。
Ordered mesoporous TiO2(OMPT) supported on carbon fibers (OMPT/CFs) were fabricated by supercritical deposition using liquid crystal as soft template. The OMPT/CFs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and nitrogen sorptometry, and their photocatalytic activity was studied through the degradation of acid orange 7 (AO7) aqueous solution. The results indicate that OMPT is dispersed on the CFs with crystalline size of 10–20 nm and pore size of 2–5 nm. Although with increasing amount of TiO2coatings the surface area of OMPT/CFs decreased relative to that of CFs, OMPT/CFs-n (n= 3) (nis the number of precipitation/drying cycles used to prepare the composite), which had the maximum TiO2content, still possessed a surface areas of 538.6 m2/g because of the mesostructure characteristics of titania. The OMPT/CFs showed high activity in the photodegradation of AO7 in aqueous solution in comparison with P25, pure OMPT and OMPT–CF mixture. Such activity was facilitated by the synergistic relationship between surface adsorption characteristics and photocatalytic potential. Because of the mutual constraint between loading and surface area on the photocatalytic efficiency, the optimal loading of OMPT in OMPT/CFs-2 for AO7 degradation is 15.2 wt%. The photocatalytic behavior could be described in terms of a modified Langmuir–Hinshelwood model.
登录
查看更多内容
影响因子：
2.9
作者：
L. Velasco;J. Parra;C. Ania
通讯作者：
L. Velasco;J. Parra;C. Ania
影响因子：
2.6
作者：
Yu Yang;Zhou Mei-hua;X. Gang;Jiang Zheng-Xiong
通讯作者：
Yu Yang;Zhou Mei-hua;X. Gang;Jiang Zheng-Xiong
影响因子：
22.1
作者：
Cao, Shengli;Yeung, King Lun;Yu, Samuel C. T.
通讯作者：
Yu, Samuel C. T.
影响因子：
3.9
作者：
Bourikas, K;Stylidi, M;Verykios, XE
通讯作者：
Verykios, XE
影响因子：
5.2
作者：
T. Yazawa;Fumiko Machida;Noriaki Kubo;T. Jin
通讯作者：
T. Yazawa;Fumiko Machida;Noriaki Kubo;T. Jin