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Fe(II)-induced transformation from ferrihydrite to lepidocrocite and goethite |
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| Authors: | Hui Liu Ping Li Yu Wei Yuhan Sun |
| Institution: | a School of Chemistry and material Science, Hebei Normal University, Shijiazhuang 050016, China b Institute of Coal Chemistry ,Chinese Academy of Sciences, Taiyuan 030001 China c Key Laboratory of Advanced Film of Hebei Province, Hebei Normal University, Shijiazhuang 050016, China |
| Abstract: | The transformation of Fe(II)-adsorbed ferrihydrite was studied. Data tracking the formation of products as a function of pH, temperature and time is presented. The results indicate that trace of Fe(II) adsorbed on ferrihydrite can accelerate its transformation obviously. The products are lepidocrocite and/or goethite and/or hematite, which is different from those without Fe(II). That is, Fe(II) not only accelerates the transformation of ferrihydrite but also leads to the formation of lepidocrocite by a new path. The behavior of Fe(II) is shown in two aspects—catalytic dissolution-reprecipitation and catalytic solid-state transformation. The results indicate that a high temperature and a high pH(in the range from 5 to 9) are favorable to solid-state transformation and the formation of hematite, while a low temperature and a low pH are favorable to dissolution-reprecipitation mechanism and the formation of lepidocrocite. Special attentions were given to the formation mechanism of lepidocrocite and goethite. |
| Keywords: | Ferrihydrite Fe(II) Catalysis Dissolution-reprecipitation Solid-state transformation Lepidocrocite Goethite |
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