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Fenton reaction mechanism generating no OH radicals in Nafion membrane decomposition
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| Title: | Fenton reaction mechanism generating no OH radicals in Nafion membrane decomposition |
| Authors: | Tsuneda, Takao Browse this author →KAKEN DB |
| Issue Date: | 23-Oct-2020 |
| Publisher: | Nature Research |
| Journal Title: | Scientific reports |
| Volume: | 10 |
| Issue: | 1 |
| Start Page: | 18144 |
| Publisher DOI: | 10.1038/s41598-020-74646-0 |
| Abstract: | Mechanism of Fenton reaction, which is a most widely-used degradation test for organic materials using hydrogen peroxide (H2O2) and iron (Fe) cations, is revealed for the decomposition of hydrated Nafion membrane. This reaction mechanism has been assumed to generate OH radicals. For a doubly-hydrated Nafion membrane model, Fenton reaction with divalent and monovalent Fe (Fe2+ and Fe+) cation hydration complexes is explored for experimentally-supported hydration numbers using long-range correction for density functional theory. As a result, it is found that H2O2 coordinating to the Fe2+ hydration complexes first approaches Nafion side chains in high humidity, then leads to the C-S bond dissociation of the side chain to produce carbonic acid group and sulfonic acid ion. On the other hand, once electron transfer proceeds between iron ions, the O-O bond of the coordinating H2O2 is extended, then the C-S bond is dissociated to produce trihydroxymethyl group and sulfur trioxide, which are rapidly transformed to carboxyl group and sulfonic acid ion in aquo. This mechanism is confirmed by the vibrational spectrum analysis of the decomposed product. Collective Nafion decomposition mechanisms also suggest that the decomposition reaction uses the recycle of generated Fe cation hydration complexes under acidic condition near membrane surface. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/79975 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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