Reduction of Copper Ions in Green Rust Suspension and Oxidation of Green Rust Containing Metallic Copper
Reduction of Copper Ions in Green Rust Suspension and Oxidation of Green Rust Containing Metallic Copper
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DOI：
10.2320/matertrans.maw200818
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发表时间：
2008-09
影响因子：
1.2
通讯作者：
K. Inoue;K. Shinoda;Shigeru Suzuki;Y. Waseda
中科院分区：
文献类型：
--
作者：
K. Inoue;K. Shinoda;Shigeru Suzuki;Y. Waseda
由Fe（II）和Fe（III）组成的绿色锈（GR）在具有相对低的电化学电势的水溶液中形成。为了理解GR悬浮液中铜的还原和氧化反应，将含有绿色锈2（SO 4 2-）（GR 2（SO 4 2-））的水溶液与硫酸铜溶液混合，随后在室温下通过含有氧气的气体将其氧化。X射线衍射，X射线吸收光谱，透射电子显微镜用于表征反应产物。在GR_2（SO_4 ~（2-））悬浮液中，Cu ~（2+）被还原成金属铜，而部分GR_2（SO_4 ~（2-））被氧化成β-FeOOH。在反应期间测量水溶液的pH和氧化还原电位值。Cu（II）还原为金属铜的重要性发生在GR 2（SO 42 ′）悬浮液中，含金属铜的悬浮液的氧化过程被认为是不同的反应阶段。这些反应阶段被认为归因于溶液中Cu（II）/Cu（0）和Fe（III）/Fe（II）的不同电化学电势。[doi：10.2320/matertrans.MAW200818]
Green rust (GR) consisting both of Fe(II) and Fe(III) was formed in an aqueous solution with a relatively low electrochemical potential. In order to understand both the reduction and oxidation reactions of copper in a GR suspension, the aqueous solution containing Green Rust 2(SO4 2� ) (GR2(SO4 2� )) was mixed with a copper sulfate solution and it was subsequently oxidized by passing a gas containing oxygen at room temperature. X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy were used for characterizing the reaction products. Copper ions were found to be reduced to metallic copper in the GR2(SO4 2� ) suspension, while a part of GR2(SO4 2� ) was oxidized to be transformed to � -FeOOH. The pH and oxidation-reduction potential values of the aqueous solution were measured during the reactions. The importance of the reduction of Cu(II) to metallic copper occurred in the GR2(SO4 2� ) suspension, and the oxidation processes of the suspension containing metallic copper was suggested as distinct reaction stages. These reaction stages are considered to be attributed to the different electrochemical potential of Cu(II)/Cu(0) and Fe(III)/Fe(II) in solution. [doi:10.2320/matertrans.MAW200818]