Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide
This study shows that iodinated organic compounds can be produced when iodide-containing waters are in contact with manganese oxide birnessite (d-MnO2) in the pH range of 5-7. In the absence of natural organic matter (NOM), iodide is oxidized to iodate that is also adsorbed onto d-MnO2. In theprese...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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American Chemical Society
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/16118 |
| _version_ | 1848749081982140416 |
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| author | Gallard, H. Allard, Sebastien Nicolau, R. Von Gunten, Urs Croue, J. |
| author_facet | Gallard, H. Allard, Sebastien Nicolau, R. Von Gunten, Urs Croue, J. |
| author_sort | Gallard, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This study shows that iodinated organic compounds can be produced when iodide-containing waters are in contact with manganese oxide birnessite (d-MnO2) in the pH range of 5-7. In the absence of natural organic matter (NOM), iodide is oxidized to iodate that is also adsorbed onto d-MnO2. In thepresence of iodide and NOM, adsordable organic iodine compounds (AOI) are formed at pH<7 because of the oxidation of iodide to iodine by d-MnO2 and the reactions of iodine with NOM. In addition, iodoacetic acid and iodoform have been identified as specific iodinated byproducts. Formation ofiodoform is not observed for high NOM/d-MnO2 ratios due to inhibition of the catalytic effect of d-MnO2 by NOM poisoning. Experiments with model compounds such as resorcinol and 3,5- heptanedione confirmed that the d-MnO2/I- system is very effective for the formation of iodinated organic compounds.These results suggest that birnessite acts as a catalyst through the oxidation of iodide to iodine and the polarization of the iodine molecule, which then reacts with NOM moieties. |
| first_indexed | 2025-11-14T07:15:16Z |
| format | Journal Article |
| id | curtin-20.500.11937-16118 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:15:16Z |
| publishDate | 2009 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-161182017-09-13T15:56:21Z Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide Gallard, H. Allard, Sebastien Nicolau, R. Von Gunten, Urs Croue, J. oxidation iodide-containing waters manganese dioxide iodinated organic compounds This study shows that iodinated organic compounds can be produced when iodide-containing waters are in contact with manganese oxide birnessite (d-MnO2) in the pH range of 5-7. In the absence of natural organic matter (NOM), iodide is oxidized to iodate that is also adsorbed onto d-MnO2. In thepresence of iodide and NOM, adsordable organic iodine compounds (AOI) are formed at pH<7 because of the oxidation of iodide to iodine by d-MnO2 and the reactions of iodine with NOM. In addition, iodoacetic acid and iodoform have been identified as specific iodinated byproducts. Formation ofiodoform is not observed for high NOM/d-MnO2 ratios due to inhibition of the catalytic effect of d-MnO2 by NOM poisoning. Experiments with model compounds such as resorcinol and 3,5- heptanedione confirmed that the d-MnO2/I- system is very effective for the formation of iodinated organic compounds.These results suggest that birnessite acts as a catalyst through the oxidation of iodide to iodine and the polarization of the iodine molecule, which then reacts with NOM moieties. 2009 Journal Article http://hdl.handle.net/20.500.11937/16118 10.1021/es9010338 American Chemical Society restricted |
| spellingShingle | oxidation iodide-containing waters manganese dioxide iodinated organic compounds Gallard, H. Allard, Sebastien Nicolau, R. Von Gunten, Urs Croue, J. Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide |
| title | Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide |
| title_full | Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide |
| title_fullStr | Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide |
| title_full_unstemmed | Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide |
| title_short | Formation of iodinated organic compounds by oxidation of iodide-containing waters with Manganese Dioxide |
| title_sort | formation of iodinated organic compounds by oxidation of iodide-containing waters with manganese dioxide |
| topic | oxidation iodide-containing waters manganese dioxide iodinated organic compounds |
| url | http://hdl.handle.net/20.500.11937/16118 |