中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (10): 1177-1181.DOI: 10.3724/SP.J.1095.2010.90804

• 研究论文 • 上一篇    下一篇

溶胶-凝胶自蔓燃法制备铁掺杂纳米TiO2光催化剂

史载锋*,宋雪芳,李娟   

  1. (海南师范大学化学与化工学院 海口 571158)
  • 收稿日期:2009-12-02 修回日期:2010-02-11 出版日期:2010-10-10 发布日期:2010-10-10
  • 通讯作者: 史载锋，男，博士，教授; E-mail:zaifengshi@163.com; 研究方向：环境化学
  • 基金资助:
    海南省重点科技项目（070601），海南省自然科学基金资助项目（209005），国家大学生创新课题（081165815）

Synthesis of Fe3+-doped Nanosized TiO2 Photocatalyst with Sol-gel Based Self-propagating High-temperature Synthesis Process

SHI Zai-Feng*, SONG Xue-Fang, LI Juan   

  1. (School of Chemistry and Chemical Engineering,Hainan Normal University,Haikou 571158)
  • Received:2009-12-02 Revised:2010-02-11 Published:2010-10-10 Online:2010-10-10

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摘要：

为了研究溶胶-凝胶自蔓燃法（SHS）制备的铁掺杂纳米TiO2的光催化活性，以TiCl4为原料制备了Fe3+掺杂TiO2光催化剂，分别在低压汞灯、中压汞灯和太阳光照射下进行了亚甲基蓝降解实验。 XRD和SEM显示，以TiCl4为前驱体，n(Ti)∶n(柠檬酸)∶n(NH4NO3)=1∶3∶5，经250 ℃自蔓燃和500 ℃热处理后，TiO2呈疏松、多孔的灰白色锐钛型粉体，粒径约为20 nm；在不同光源作用下，掺铁摩尔分数为0.02%的TiO2催化活性均最大;亚甲基蓝溶液在掺铁分数为0.02%的TiO2作用下，经太阳光照90 min后降解率达到了96.1%，为纯TiO2的1.78倍。

关键词: 溶胶-凝胶自蔓燃, 铁掺杂, TiO2, 光催化

Abstract:

A Fe3+-doped nanosized TiO2 photocatalyst was synthesized from a sol-gel based self-propagating high-temperature synthesis process(SHS) with TiCl4 as the raw material. Its photocatalytic activity was studied by probing the degradation of methylene blue(MB) under different light irradiations including sunlight, low and high pressure mercury lamps. XRD and SEM results indicate that the as-prepared nanoscale TiO2 powder is a porous anatase material after SHS at 350 ℃ and heat-treatment at 500 ℃. The optimal precursor molar ratio of n(Ti)∶n(citric acid)∶n(NH4NO3) is 1∶3∶5，the particle size is ~20 nm. Experimental results show that the highest photocatalytic activity of Fe3+-doped TiO2 could be achieved when the molar ratio of Fe3+ to TiO2 is 0.02%. Removing rate of MB was 96.1% with Fe3+-doped TiO2 as catalyst and sunlight as light source, which is 1.78 times of that of pure TiO2.

Key words: sol-gel based self-propagating high-temperature synthesis process, Fe3+-doped, TiO2, photocatalysis

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