Analysis of iron oxyhydroxides and oxides converted from green rust in aqueous solution
Analysis of iron oxyhydroxides and oxides converted from green rust in aqueous solution
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DOI：
10.2355/isijinternational.47.453
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发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
Waseda, Yoshio
中科院分区：
文献类型：
--
作者：
Inoue, Katsuya;Kwon, Sang-Koo;Waseda, Yoshio
为了阐明反应条件对羟基硫酸绿锈（GR）生成羟基氧化铁和氧化物的影响，采用X射线衍射法对转化过程中形成的固体颗粒进行了分析。 GR 由硫酸铁、硫酸亚铁和氢氧化钠溶液合成。含有GR的悬浮液通过通入氧气而被氧化。 X射线吸收光谱和透射电子显微镜分别用于分析从悬浮液中分离的固体颗粒的化学状态和结构。结果表明，GR 主要转化为 α-FeOOH，并且根据温度和氧气流量，在转化过程中发现部分形成 γ-FeOOH 和 Fe3O4。此外，添加锰可以增强 Fe3O4 的形成。这些结果表明，水溶液中不同结构的羟基氧化铁和氧化物的形成对反应条件敏感。
In order to clarify the influence of reaction conditions on the formation of iron oxyhydroxides and oxides obtained from hydroxysulfate green rust (GR), the X-ray diffraction method was used for analyzing the solid particles formed during conversion. GR was synthesized from solutions of ferric sulfate, ferrous sulfate, and sodium hydroxide. The suspension containing GR was oxidized by passing oxygen gas. X-ray absorption spectroscopy and transmission electron microscopy were used for analyzing the chemical state and structure of the solid particles separated from the suspension, respectively. The results revealed that GR was converted primarily to alpha-FeOOH, and gamma-FeOOH and Fe3O4 were found to be partially formed during the conversion depending on the temperature and oxygen flow rate. Furthermore, the addition of manganese was shown to enhance the formation of Fe3O4. These results indicate that the formation of different structures of iron oxyhydroxides and oxides in an aqueous solution is sensitive to the reaction conditions.