Kinetics of Ferrite Formation in a Three-Phase System
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概要
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We have measured the change in concentrations of the ferrous and divalent metal ions over time in a three-phase system consisting of air, a pH-controlled solution of ferrous and various divalent ions (Co, Zn, Ni and Cd), and precipitated ferrite. To quantitatively interpret the kinetics of the ferrite formation process, we proposed a reaction model which takes into account the absorption rate and the chemical reaction rates in the aqueous phase. The concentration changes early in the reaction can be expressed by a model with two fitting parameters. The value of the fitting parameter k1, which expresses the oxidation rate of the ferrous ion, greatly depends on the specific divalent metal ion used and its initial concentration. The decrease in the relative concentration of the ferrous ion (Y = CA/CA0) correlates with the decrease in the concentration of the divalent metal ions, (X = CM/CM0). To quantitatively express the relationship between X and Y, using the model we derive a theoretical equation with a fitting parameter, (k2/kM), which is the ratio of rate constants for magnetite and ferrite formations. The value of this parameter decreases for a lower initial concentration ratio of ferrous ion to divalent ion in the following order: cobalt, zinc, nickel and cadmium. The order corresponds to the fixation of the divalent metal ions into the ferrite at equilibrium.
- 社団法人 化学工学会の論文
著者
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WATANABE Masahiko
Department of Surgery, School of Medicine, Keio University
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Watanabe Masahiko
Department Of Anatomy Hokkaido University School Of Medicine
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Tomita Ayako
Department Of Chemical Engineering Faculty Of Engineering And High Technology Research Center Kansai
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TSUCHIYA Teizo
Japan Ecology Corporation
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MIYAKE Yoshikazu
Department of Chemical Engineering, Faculty of Engineering and High Technology Research Center, Kans
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SHIGEHISA Takanori
Department of Chemical Engineering, Faculty of Engineering and High Technology Research Center, Kans
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Miyake Yoshikazu
Department Of Chemical Engineering Faculty Of Engineering And High Technology Research Center Kansai
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Watanabe Masahiko
Department Of Anaomy Hokkaido University School Of Medicine
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Miyake Yoshikazu
Department Of Chemical Energy And Environmental Engineering Faculty Of Environmental And Urban Engin
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Watanabe Masahiko
Department Of Agricultural Chemistry The University Of Tokyo
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Shigehisa Takanori
Department of Chemical Engineering, Faculty of Engineering and High Technology Research Center, Kansai University
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Tomita Ayako
Department of Chemical Engineering, Faculty of Engineering and High Technology Research Center, Kansai University
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Watanabe Masahiko
Department of Chemical Engineering, Faculty of Engineering and High Technology Research Center, Kansai University
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