Formation of magnetite in the presence of ferric oxyhydroxides

被引:104
作者
Ishikawa, T [1 ]
Kondo, Y [1 ]
Yasukawa, A [1 ]
Kandori, K [1 ]
机构
[1] Osaka Univ Educ, Sch Chem, Kashiwara, Osaka 5828582, Japan
关键词
magnetite; ferric oxyhydroxides;
D O I
10.1016/S0010-938X(98)00045-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The products of the reactions of ferric oxyhydroxides (alpha-, beta- and gamma-FeOOH) with Ferrous species in O-2-free aqueous systems containing Cl- were characterized by XRD, FTIR and TEM. The reactions using all the FeOOH gave Fe3O4 at 25-100 degrees C and a wide pH range from 3 to 13, accompanying a depletion of FeOOH. The yield of Fe3O4 depended on the molar ratio of OH/Fe(II) in the suspensions, showing a maximum at OH/Fe(II) = 2. The maximum yield of Fe3O4 was in the order of beta-FeOOH > gamma-FeOOH>>alpha-FeOOH. It was revealed that Fe3O4 is formed by the reactions of the dissolved species of Fe(OH)(2) with those of FeOOH. (C) 1998 Elsevier Science Ltd. All rights reserved
引用
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页码:1239 / 1251
页数:13
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