高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (12): 2855.doi: 10.7503/cjcu20130314

• 物理化学 • 上一篇    下一篇

一步火焰辅助热解法制备Fe掺杂嵌碳TiO2及其光催化性能

陈希, 李绘, 孙通, 崔晓莉   

  1. 复旦大学材料科学系, 上海 200433
  • 收稿日期:2013-04-08 出版日期:2013-12-10 发布日期:2013-05-16
  • 作者简介:崔晓莉,女,博士,教授,主要从事光催化材料和半导体电极光电化学研究. E-mail:xiaolicui@fudan.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:21273047)和国家“九七三”计划项目(批准号:2012CB934300,2011CB933300)资助.

One-step Flame-assisted Pyrolysis Synthesis of Fe Doped Carbon Incorporated TiO2 and Its Photocatalytic Activity

CHEN Xi, LI Hui, SUN Tong, CUI Xiao-Li   

  1. Department of Materials Science, Fudan University, Shanghai 200433, China
  • Received:2013-04-08 Online:2013-12-10 Published:2013-05-16

摘要:

以钛酸四丁酯、无水乙醇和无水氯化铁为前驱体,通过一步火焰辅助热解法制备了Fe掺杂嵌碳TiO2,并研究了样品的光催化活性. 利用扫描电子显微镜及能谱、X射线光电子能谱、X射线粉末衍射和紫外-可见漫反射吸收光谱等对样品的形貌、组分、晶型和光吸收进行了表征,并研究了样品在紫外和可见光下的光催化活性. 结果表明,无需后续热处理可直接得到主要是锐钛矿相TiO2的样品,Fe3+以替位掺杂形式进入TiO2晶格,随掺杂量增加,样品在可见光区域的吸光度提高,吸收带边红移. Fe掺杂量(摩尔分数)小于0.2%可改善样品的光催化活性,当Fe掺杂量为0.1%时,样品在可见光和紫外-可见光照射下均显示出最高的降解亚甲基蓝速率.

关键词: 火焰辅助热解法, Fe掺杂, 嵌碳, TiO2, 光催化活性

Abstract:

Fe doped carbon incorporated TiO2 was synthesized with a simple and facile one-step flame-assisted pyrolysis method and its photocatalytic properties were characterized by degradation of methylene blue(MB). The morphology, components, crystalline structure and absorbance of as-prepared samples were characterized by SEM, EDX, XPS, XRD and UV-Vis DRS, respectively. EDX and XPS results show that Fe3+ was introduced into TiO2 lattice by substituting Ti4+. XRD patterns reflect that mainly anatase TiO2 was obtained directly without any annealing. The absorbance edges show red shifts, and absorbance of visible light enlarge with increasing Fe amount, indicating the narrowed optical band gap with the introduce of impurity energy levels. SEM results show that the uniform micro spherical shapes of carbon incorporated TiO2 were damaged with the introduction of Fe. The promoted photocatalytic activity of samples for the degradation of MB was observed under both visible light and UV-Vis light irradiation with Fe doping not more than 0.2%. The highest photocatalytic degradation rate for MB was observed for the sample with 0.1%(molar fraction) Fe. The photocatalytic activity decreased when the Fe doping amount reached to 0.3%.

Key words: Flame-assisted pyrolysis, Fe doping, Carbon incorporation, TiO2, Photocatalytic activity

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