Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment
© 2018 American Chemical Society. Oxidative treatment of iodide-containing waters can form iodinated disinfection by-products (I-DBPs) that are more toxic than the regulated DBPs. To better understand the fate of iodine during water treatment with ferrate(VI), kinetics, products, and stoichiometries...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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American Chemical Society
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/68458 |
| _version_ | 1848761807043297280 |
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| author | Shin, J. Von Gunten, U. Reckhow, D. Allard, Sebastien Lee, Y. |
| author_facet | Shin, J. Von Gunten, U. Reckhow, D. Allard, Sebastien Lee, Y. |
| author_sort | Shin, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 American Chemical Society. Oxidative treatment of iodide-containing waters can form iodinated disinfection by-products (I-DBPs) that are more toxic than the regulated DBPs. To better understand the fate of iodine during water treatment with ferrate(VI), kinetics, products, and stoichiometries for the reactions of ferrate(VI) with iodide (I-) and hypoiodous acid (HOI) were determined. Ferrate(VI) showed considerable reactivities to both I-and HOI with higher reactivities at lower pH. Interestingly, the reaction of ferrate(VI) with HOI (k = 6.0×103M-1s-1at pH 9) was much faster than with I-(k = 5.6×10 M-1s-1at pH 9). The main reaction pathway during treatment of I--containing waters was the oxidation of I-to HOI and its further oxidation to IO3-by ferrate(VI). However, for pH > 9, the HOI disproportionation catalyzed by ferrate(VI) became an additional transformation pathway forming I-and IO3-. The reduction of HOI by hydrogen peroxide (k = 2.0×108M-1s-1for the reaction, HOI + HO2-? I-+ O2+ 2H+), the latter being produced from ferrate(VI) decomposition, also contributes to the I-regeneration in the pH range 9 - 11. A kinetic model was developed that could well simulate the fate of iodine in the ferrate(VI)-I-system. Overall, due to a rapid oxidation of I-to IO3-with short-lifetimes of HOI, ferrate(VI) oxidation appears to be a promising option for I-DBP mitigation during treatment of I--containing waters. |
| first_indexed | 2025-11-14T10:37:32Z |
| format | Journal Article |
| id | curtin-20.500.11937-68458 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:37:32Z |
| publishDate | 2018 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-684582018-06-29T12:35:00Z Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment Shin, J. Von Gunten, U. Reckhow, D. Allard, Sebastien Lee, Y. © 2018 American Chemical Society. Oxidative treatment of iodide-containing waters can form iodinated disinfection by-products (I-DBPs) that are more toxic than the regulated DBPs. To better understand the fate of iodine during water treatment with ferrate(VI), kinetics, products, and stoichiometries for the reactions of ferrate(VI) with iodide (I-) and hypoiodous acid (HOI) were determined. Ferrate(VI) showed considerable reactivities to both I-and HOI with higher reactivities at lower pH. Interestingly, the reaction of ferrate(VI) with HOI (k = 6.0×103M-1s-1at pH 9) was much faster than with I-(k = 5.6×10 M-1s-1at pH 9). The main reaction pathway during treatment of I--containing waters was the oxidation of I-to HOI and its further oxidation to IO3-by ferrate(VI). However, for pH > 9, the HOI disproportionation catalyzed by ferrate(VI) became an additional transformation pathway forming I-and IO3-. The reduction of HOI by hydrogen peroxide (k = 2.0×108M-1s-1for the reaction, HOI + HO2-? I-+ O2+ 2H+), the latter being produced from ferrate(VI) decomposition, also contributes to the I-regeneration in the pH range 9 - 11. A kinetic model was developed that could well simulate the fate of iodine in the ferrate(VI)-I-system. Overall, due to a rapid oxidation of I-to IO3-with short-lifetimes of HOI, ferrate(VI) oxidation appears to be a promising option for I-DBP mitigation during treatment of I--containing waters. 2018 Journal Article http://hdl.handle.net/20.500.11937/68458 10.1021/acs.est.8b01565 American Chemical Society restricted |
| spellingShingle | Shin, J. Von Gunten, U. Reckhow, D. Allard, Sebastien Lee, Y. Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment |
| title | Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment |
| title_full | Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment |
| title_fullStr | Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment |
| title_full_unstemmed | Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment |
| title_short | Reactions of ferrate(VI) with iodide and hypoiodous acid: Kinetics, pathways, and implications for the fate of iodine during water treatment |
| title_sort | reactions of ferrate(vi) with iodide and hypoiodous acid: kinetics, pathways, and implications for the fate of iodine during water treatment |
| url | http://hdl.handle.net/20.500.11937/68458 |