催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (10): 1221-1226.DOI: 10.1016/S1872-2067(10)60115-5

• 研究论文 • 上一篇    下一篇

超临界 CO2 辅助制备 TiO2 外负载火山岩复合体及其光催化降解亚甲基蓝性能

马明远, 李佑稷, 陈伟, 李雷勇   

  1. 吉首大学化学化工学院, 湖南吉首 416000
  • 收稿日期:2010-10-25 出版日期:2010-10-25 发布日期:2014-03-04

Preparation of Cost-Effective TiO2-Outerloaded Porous Lava Composites Using Supercritical CO2 and Their Photocatalytic Activity for Methylene Blue Degradation

MA Minyuan, LI Youji*, CHEN Wei, LI Leiyong   

  1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, China
  • Received:2010-10-25 Online:2010-10-25 Published:2014-03-04

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摘要： 以钛酸丁酯为前驱体, 封堵的火山岩为载体, 通过超临界 CO2 辅助制备了 TiO2 外负载火山岩复合体, 并将其用于光催化降解亚甲基蓝反应, 考察了溶液 pH 值及催化剂浓度对反应性能的影响. 结果表明, TiO2 外负载火山岩复合体的光催化性能优于纯 TiO2 和 TiO2 体负载火山岩复合体. 这是由于外负载复合体对亚甲基蓝的高吸附性、小晶粒尺寸的 TiO2 颗粒以及吸附和光催化降解间的协同效应. 亚甲基蓝浓度为 1.5 mg/L, 溶液 pH 为 8, 催化剂浓度为 6.8 mg/L 时, 外负载 TiO2 火山岩复合体上亚甲基蓝降解速率最高, 且使用后的催化剂仍具有高的光催化活性.

关键词: 二氧化钛, 多孔火山岩, 溶胶凝胶法, 光催化, 亚甲基蓝, 超临界二氧化碳

Abstract: Cost-effective TiO2-outerloaded lava composites (TOLs) were prepared using supercritical CO2 and sealing lava as well as tetrabutyl titanate as a support and a precursor, respectively. The important factors affecting methylene blue (MB) oxidation efficiency were investigated including the initial concentration of MB, the pH, and catalyst concentration. The results show that TOLs have a higher degradation efficiency than pure TiO2 and TiO2-loaded lava composites (TLLs) because of the high adsorption capacity of MB and the small crystalline size of the TiO2 particles in addition to a synergetic effect for adsorption and photocatalytic degradation. The optimum conditions were a MB concentration of 1.5 mg/L at pH 8 with a TOLs concentration of 6.8 mg/L for the fastest MB degradation. Additionally, the used TOLs retained high activity for MB photocatalytic degradation.

Key words: titania, porous lava, sol-gel process, photocatalysis, methylene blue, supercritical carbon dioxide