催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (10): 1681-1688.DOI: 10.3724/SP.J.1088.2012.20532

• 研究论文 • 上一篇    下一篇

溶胶-凝胶辅助水热双模板法制备球形介孔 TiO2

王殿平, 刘守新*   

  1. 东北林业大学生物质材料教育部重点实验室, 黑龙江哈尔滨 150040
  • 收稿日期:2012-05-25 修回日期:2012-06-26 出版日期:2012-09-28 发布日期:2012-09-28

Preparation of Mesoporous TiO2 Spheres via Sol-Gel Assisted Hydrothermal Method Using Double Templates

WANG Dianping, LIU Shouxin?   

  1. Key Laboratory of Bio-based Material of Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, Heilongjiang, China
  • Received:2012-05-25 Revised:2012-06-26 Online:2012-09-28 Published:2012-09-28

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摘要： 以聚乙二醇和共嵌段化合物 F127 为双模板剂, 采用溶胶-凝胶辅助水热法制备了球形介孔 TiO2 (MS-TiO2). 采用扫描电镜、透射电镜、X 射线衍射、热重分析和低温 N2 吸附-脱附对样品进行了结构表征, 并以苯酚为降解模型物在紫外光下对其活性进行了评价. 结果表明, 所得 TiO2 为球形介孔结构, 孔径为 6.5~12.6 nm, 比表面积最高可达 106.9 m2/g, 孔体积 0.21 cm3/g, 球形颗粒直径 200~300 nm, 由粒径为 15~20 nm 的小晶粒组成. 随着焙烧温度的升高, TiO2 的比表面积和孔体积减小, 孔径增大. 双模板剂的使用比单一模板剂更能形成稳定的立体网状球形胶束, 并有效抑制 TiO2 前驱体的团聚, 诱导其形成球形介孔结构. 其中, 在 500 oC 下焙烧所制 MS-TiO2 样品表现最高的光催化活性, 苯酚降解率达 86.4%, 为 TiO2 的 1.3 倍.

关键词: 双模板, 二氧化钛, 介孔, 球形, 表面活性剂, 苯酚

Abstract: Mesoporous TiO2 (MS-TiO2) spheres were prepared by a sol-gel assisted hydrothermal method using double-surfactant (PEG and F127) as templates. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, thermal gravimetry, and N2 adsorption-desorption were used for catalyst structural characterization. Phenol was used as a model compound for photocatalytic activity test. The results showed that MS-TiO2 spheres with uniform diameter of 200–300 nm, which was composed by 15–20 nm of TiO2 crystals, can be obtained. Maximum specific surface area as high as 106.9 m2/g, together with pore diameter of 6.5–12.6 nm and pore volume of 0.21 cm3/g can be achieved under the optimum conditions. With increasing calcination temperature, specific surface area and pore volume of MS-TiO2 decreased, and pore diameter enlarged. Double templates can form a more stable spherical micelle, inhibit the growth and particle aggregation of TiO2 precursor and promote its self-assembly into spherical structure. MS-TiO2 prepared at 500 °C exhibited the highest activity with the phenol degradation of 86.4%, which is about 1.3 times that of TiO2 without templates.

Key words: double template, titanium dioxide, mesopore, sphere, surfactant, phenol