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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (21): 2173-2177. 上一篇    下一篇

研究论文

弱磁场下低温中和法制备亚微米非晶态δ-FeOOH的研究

傅小明*, 钟云波, 任忠鸣, 邓康, 徐匡迪   

  1. (上海大学上海市现代冶金与材料制备重点实验室 上海 200072)
  • 投稿日期:2005-11-25 修回日期:2006-04-04 发布日期:2006-11-14
  • 通讯作者: 傅小明

Preparation of Sub-micron Amorphous δ-FeOOH by Low-temperature Neutralization Method in Low Magnetic Field

FU Xiao-Ming*; ZHONG Yun-Bo; REN Zhong-Ming; DENG Kang; XU Kuang-Di   

  1. (Shanghai Key Laboratory of Modern Metallurgy & Material Processing, Shanghai University, Shanghai 200072)
  • Received:2005-11-25 Revised:2006-04-04 Published:2006-11-14
  • Contact: FU Xiao-Ming

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利用XRD和SEM分别对在弱磁场下通过低温中和法制备的羟基铁氧化物进行相成分和颗粒形貌分析. 试验结果表明: 无磁场下, 产物是由部分球形和部分针状的α-FeOOH组成. 0.1 T磁场下, 产物是纺锤形的γ-FeOOH, 但是, 其粒度分布很不均匀. 0.3 T磁场下, 产物是球形的Fe1.833(OH)0.5O0.25. 0.5 T磁场下, 产物是100 nm左右的球形的非晶态δ-FeOOH. Fe1.833(OH)0.5O0.25是无磁场下制备的α-FeOOH向弱磁场下制备的δ-FeOOH转变的中间产物. 并且, 亚微米球形Fe1.833(OH)0.5O0.25和亚微米非晶态球形δ-FeOOH的粒度分布都很均匀. 此外, 弱磁场影响羟基铁氧化物的结晶度.

关键词: 弱磁场, 低温中和法, 亚微米, 非晶态δ-FeOOH

Iron oxide hydroxide prepared by low-temperature neutralization reaction in zero and low magnetic field was analyzed with XRD and SEM. The experimental results turned out that spherical and acicular goethite (α-FeOOH) was prepared in zero magnetic field. Spindly lepidocrocite (γ-FeOOH) was prepared in 0.1 T magnetic field. And its grain size distribution was not homogeneous. Sub-micron spherical Fe1.833(OH)0.5O0.25 was prepared in 0.3 T magnetic field. Sub-micron spherical misawite (δ-FeOOH) of about 100 nm, the crystalline state of which was amorphous, was prepared in 0.5 T magnetic field. Fe1.833(OH)0.5O0.25 was an intermediate product from goethite (α-FeOOH) prepared in zero magnetic field to misawite (δ-FeOOH) prepared in low magnetic field. And the grain size distribution of sub-micron spherical Fe1.833(OH)0.5O0.25 and spherical misawite (δ-FeOOH) was homogeneous. Besides, the crystallinity of iron oxide hydroxide (FeOOH) was influenced by low magnetic field greatly.

Key words: low magnetic field, low-temperature neutralization method, sub-micron, amorphous δ-FeOOH