Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron |
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Authors: | Naoyuki Kishimoto Shiori Iwano Youhei Narazaki |
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Institution: | 1. Faculty of Science and Technology, Ryukoku University, 1-5 Yokotani, Setaoe-cho, Otsu, 520-2194, Japan 2. Graduate School of Science and Technology, Ryukoku University, 1-5 Yokotani, Setaoe-cho, Otsu, 520-2194, Japan
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Abstract: | Mechanism of zinc iron removal by zero-valent iron was discussed through zinc removal responses to several operational conditions of a packed column reactor with zero-valent iron powder. The adsorption isotherm observed implied that a kind of chemisorption was responsible for zinc removal. Zinc removal by zero-valent iron was enhanced by dissolved oxygen and ferric ion addition. However, it was deteriorated under acidic pH. In addition, zinc adsorbed on zero-valent iron was eluted by a reducing agent such as citric acid, whereas the zinc was not eluted by diluted sulfuric acid. Consequently, the zinc removal mechanism by zero-valent iron was inferred to be as follows: Zero-valent iron was firstly corroded and oxidized into ferric ion by dissolved oxygen. The ferric ion was precipitated as iron hydroxide onto the surface of the zero-valent iron powder. Zinc ion was adsorbed on and/or coprecipitated with the iron hydroxide. The iron hydroxide was finally oxidized and transformed into iron oxides. |
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