]*>","")" /> TiO2/SiO2/γ-Fe2O3-SiO2磁性光催化剂的制备与表征
催化学报

催化学报 ›› 2005, Vol. 26 ›› Issue (11): 938-940.

• 研究快讯 • 上一篇    下一篇

TiO2/SiO2/γ-Fe2O3-SiO2磁性光催化剂的制备与表征

王松威,徐盛明,陈崧哲,徐景明   

  1. 清华大学核能与新能源技术研究院, 北京 100084
  • 收稿日期:2005-11-25 出版日期:2005-11-25 发布日期:1985-08-26

  • Received:2005-11-25 Online:2005-11-25 Published:1985-08-26

PDF

745

被引次数

46

摘要： A γ-Fe2O3-SiO2 composite was prepared by sol-gel method followed by calcination at 700 ℃ for 30 min starting from tetraethoxysilane and iron nitrate. Upon further coating with SiO2 and TiO2, a TiO2/SiO2/γ-Fe2O3-SiO2 magnetic photocatalyst was obtained. XRD results show that Fe in the composite converts to the γ-Fe2O3 phase up to a processing temperature of 700 ℃, and further increase in temperature results in the formation of the α-Fe2O3 phase. The TiO2/SiO2/γ-Fe2O3-SiO2 samples obtained are monodisperse spherical particles with 200～250 nm diameter, well coated firstly by an amorphous SiO2 layer and then by an anatase TiO2 layer. The TiO2/SiO2/γ-Fe2O3-SiO2 particles retain their magnetic property well and show high activity for the photocatalytic degradation of salicylhydroxamic acid.

关键词: 氧化铁, 氧化钛, 氧化硅, 磁性光催化剂, 热稳定性, 包覆