Preparation of Acicular γ-FeOOH by Liquid-Precipitation and Air-Oxidation Method

Abstract:

The acicular γ-FeOOH powders were synthesized by liquid-precipitation and air-oxidation method using FeCl2•4H2O as raw material. The affecting factors, which consist of alkaline ratio (OH-/Fe²⁺), reaction temperature and dropping speed of alkaline, were discussed. From the results, it was shown that when the ratio of OH-/Fe²⁺ was controlled in the range of 0.6-1.2 in the crystal seeds formation process, the pure phase of γ-FeOOH can be formed. When the ratio of OH-/Fe²⁺ was lower than 0.6, the γ-FeOOH crystal seeds could not be formed. While the ratio of OH-/Fe²⁺ was higher than 1.2, the phase of Fe3O4 appeared. According to the principle of chemical kinetics and chemical thermodynamics, the phases of α-FeOOH and Fe₃O₄ appeared when temperature was higher than 30°C. In the process of the crystal seeds growth, the suitable reaction temperature was at 50°C.

• Periodical: Advanced Materials Research (Volumes 391-392)
• Pages: 922-925
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.391-392.922
• Online since: December 2011
• Authors: Jin Hong Meng, Wen Ju Wang, Yu Zhuo Tan, Jie Sun, Xiao Hui Cao
• Keywords: Acicular γ-Feooh, Formation, Solution Reaction

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