催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (2): 321-324.DOI: 10.3724/SP.J.1088.2011.00932

• 研究论文 • 上一篇    下一篇

炭气凝胶孔结构对其负载的 TiO2 光催化降解甲基橙性能的影响

崔华楠, 赵振华, 梁业如, 石建英, 吴丁财, 刘鸿, 符若文   

  1. 中山大学化学与化学工程学院, 广东广州 510275
  • 收稿日期:2010-09-30 修回日期:2010-10-12 出版日期:2011-01-26 发布日期:2014-06-25

Influence of Carbon Aerogel (CA) Pore Structure on Photodegradation of Methyl Orange over TiO2/CA

CUI Huanan, ZHAO Zhenhua, LIANG Yeru, SHI Jianying*, WU Dingcai*, LIU Hong, FU Ruowen   

  1. School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
  • Received:2010-09-30 Revised:2010-10-12 Online:2011-01-26 Published:2014-06-25

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摘要： 选用两种孔径不同的炭气凝胶 CA125 和 CA500 制备了碳含量为 20% 的 TiO2/CA 光催化剂, 采用 X 射线衍射、扫描电镜和 N2 吸附-脱附对催化剂进行了表征, 并考察了其光催化降解甲基橙反应性能. 结果表明, TiO2/CA 样品中 TiO2 主要以锐钛矿相存在, 伴随有少量的金红石相, 且均匀分散于炭气凝胶的表面. 催化剂的孔隙率分析表明, 孔结构直接影响到催化剂的光催化活性, 以中孔为主的 TiO2/CA125 活性要远高于 TiO2/CA500. 这主要源于中孔良好的吸附性能及其合适的空间限域效应.

关键词: 炭气凝胶, 氧化钛, 限域效应, 光催化, 甲基橙, 降解

Abstract: Two kinds of carbon aerogel (CA), CA125 and CA500, with pore diameters of ~18 nm and > 50 nm, respectively, were used as supports to prepare TiO2/CA photocatalysts with the CA content of 20%. X-ray diffraction, scanning electron microscopy and N2 adsorption-desorption were used to characterize the crystal structure, morphology, and pore structures of the TiO2/CA photocatalysts, respectively. The loaded TiO2 was mainly anatase with a little amount of rutile, which was homogeneously dispersed on the CA support. The activity of TiO2/CA125 was much higher than that of TiO2/CA500 in the photodegradation of methyl orange. The photodegradation rate over TiO2/CA is mainly influenced by the pore structure of the catalysts. The favorable adsorption and suitable confinement effect of mesopore structure are beneficial to the photodegradation of methyl orange. Therefore, TiO2/CA125 with the large amount of mesopores displays the higher photocatalytic activity than TiO2/CA500.

Key words: carbon aerogel, titania, confinement effect, photocatalysis, methyl orange, degradation