Sorption of silicon on magnetite and other corrosion products of iron
| Autor: | Aude Naveau, Stéphanie Leclercq, H. Catalette, Violaine Philippini |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Nuclear and High Energy Physics
Goethite Silicon Metallurgy chemistry.chemical_element Sorption Electrolyte engineering.material Corrosion chemistry.chemical_compound Siderite Nuclear Energy and Engineering chemistry visual_art engineering visual_art.visual_art_medium General Materials Science Pyrite Magnetite Nuclear chemistry |
| Zdroj: | Journal of Nuclear Materials. 348:60-69 |
| ISSN: | 0022-3115 |
| Popis: | The sorption of Si on various iron corrosion products of nuclear waste canisters (magnetite Fe3O4, goethite a-FeOOH, and siderite FeCO3) and pyrite FeS2 was evidenced in the presence of a background electrolyte (NaCl or NaClO4). For magnetite, goethite and siderite, Si sorption increased with pH in the 3–7 pH range. It reached a plateau, and finally it decreased at pH more than 9. Sorption capacities were determined for magnetite ð19 � 10 � 6 molSi g � 1 magnetite Þ, goethite ð79 � 10 � 6 molSi g � 1 goethite Þ and siderite ð20 � 10 � 6 mol Si g � 1 siderite Þ, while it could be neglected for pyrite since it is almost zero. Sorption data on magnetite was modelled using a surface complexation model with the bidentate surface complex (� XO)2Si(OH)2 and log K complexation ¼ 8:6. Influence of magnetite on glass lifetime was evaluated and it was estimated negligible. |
| Databáze: | OpenAIRE |
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