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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (21): 2348-2352. 上一篇    下一篇

研究论文

不同晶化度γ-FeOOH的合成及其液相转化研究

陈汝芬a,b 邓 娟a 宋国强a 魏 雨*,a 侯登录b

  

  1. (a河北师范大学 化学与材料科学学院 石家庄 050016)
    (b河北师范大学 物理科学与信息工程学院 石家庄 050016)

  • 投稿日期:2007-12-18 修回日期:2008-01-12 发布日期:2008-11-14
  • 通讯作者: 魏雨

Synthesis of Different Crystalline γ-FeOOH and Their Liquid Phase Transformation

CHEN, Ru-Fen a,b DENG, Juan a SONG, Guo-Qiang a WEI, Yu *,a HOU, Deng-Lu b   

  1. (a College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050016)
    (b College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050016)
  • Received:2007-12-18 Revised:2008-01-12 Published:2008-11-14
  • Contact: WEI, Yu

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被引次数

30 | 5

进行了空气氧化Fe(OH)2悬浮液, EDTA作用下可见光诱导, 不同温度(14～20 ℃)制备不同晶化度γ-FeOOH的研究, 进行了其沸腾回流液相转化历程的探讨. 结果表明: 随温度的升高, γ-FeOOH的晶化程度变差; 而γ-FeOOH的晶化程度越差, 在液相沸腾回流时就越易转化成α-Fe2O3, 反之则易转化为α-FeOOH. 在pH近中性, 微量Fe(II)存在条件下低晶态的γ-FeOOH可以快速转化为均匀球形的α-Fe2O3.

关键词: γ-FeOOH, 液相转化, α-Fe2O3, α-FeOOH

The preparation of different crystalline degree lepidocrocite (γ-FeOOH) from air oxidation of Fe(OH)2 under irradiation by visible light in the presence of trace EDTA at different temperatures (14～20 ℃) were described. And the mechanism of the liquid phase transformations of γ-FeOOH was also studied. The experimental result showed that the crystalline degree of γ-FeOOH became poor with the increase of the temperature; the lower the crystallization degree of γ-FeOOH, the easier of the transformation to hematite (α-Fe2O3) by boiling reflux method; the goethite (α-FeOOH) was obtained from the liquid phase transformations of the high crystalline γ-FeOOH; the low crystalline γ-FeOOH could transform to spherical α-Fe2O3 rapidly under a near-neutral pH condition and in the presence of trace Fe(II).

Key words: lepidocrocite, liquid phase transformation, hematite, goethite