高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (5): 945.

• 研究简报 • 上一篇    下一篇

Fe(OH)2悬浮液在EDTA作用下氧气氧化生成δ-FeOOH的机理研究

魏雨, 孟哲, 贾振斌, 马子川   

  1. 河北师范大学化学学院, 石家庄050016
  • 收稿日期:2004-05-09 出版日期:2005-05-10 发布日期:2005-05-10
  • 通讯作者: 魏　雨(1955年出生),男,教授,从事纳米金属复合氧化物的液相合成及机理的研究.E-mail:weiyu@mail.hebtu.edu.cn E-mail:weiyu@mail.hebtu.edu.cn
  • 基金资助:

    河北省自然科学基金(批准号:501115)资助.

Mechanism of δ-FeOOH Formation by Oxygen Oxidizing Fe(OH)2 Suspension with EDTA Used as Cofactor

WEI Yu, MENG Zhe, JIA Zhen-Bin, MA Zi-Chuan   

  1. College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China
  • Received:2004-05-09 Online:2005-05-10 Published:2005-05-10

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关键词: &delta, -FeOOH, EDTA, Fe(OH)2, 氧化

Abstract: At room temperature and in the presence of trace EDTA, the formation of δ-FeOOH was studied by the rapid oxidation of Fe(OH)2 suspension with O2. The structural and morphological changes were characterized by various techniques such as XRD, FTIR and TEM. γ-FeOOH and (δ-FeOOH) formed simutaneously in the early period of oxidation. But as the rate of mass transfer was in equilibrium, trace (γ-FeOOH) vanished gradually. Accordingly, pure phase δ-FeOOH was obtained. At the same time, critical amount ratio K of EDTA to Fe2+ was verified. The experiments show that the reactivity, rate of the oxidizing agent and pH of the initial medium were important factors for the formation of pure phase (δ-FeOOH). Under the auxiliary effect of EDTA, the reactivity of O2 was nearly improved to that of H2O2. And the process of the oxidation that Fe(OH)2 suspension was oxidized by O2 under that condition was discussed.

Key words: δ-FeOOH, EDTA, Fe(OH)2, Oxidation

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