Formation of environmentally persistent free radicals (EPFRs) on ZnO at room temperature: Implications for the fundamental model of EPFR generation
| Autor: | Mark F. DiTusa, Cheri A. McFerrin, Phillip Sprunger, Erwin D. Poliakoff, Matthew C. Patterson, Randall W. Hall, Richard L. Kurtz |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Radical General Physics and Astronomy Infrared spectroscopy Nanotechnology 010501 environmental sciences 010402 general chemistry Photochemistry 01 natural sciences Article 0104 chemical sciences law.invention Metal Adsorption Zno nanoparticles law visual_art Oxidizing agent visual_art.visual_art_medium Physical and Theoretical Chemistry Electron paramagnetic resonance 0105 earth and related environmental sciences |
| Zdroj: | Chemical Physics Letters. 670:5-10 |
| ISSN: | 0009-2614 |
| Popis: | Environmentally persistent free radicals (EPFRs) have significant environmental and public health impacts. In this study, we demonstrate that EPFRs formed on ZnO nanoparticles provide two significant surprises. First, EPR spectroscopy shows that phenoxy radicals form readily on ZnO nanoparticles at room temperature, yielding EPR signals similar to those previously measured after 250 °C exposures. Vibrational spectroscopy supports the conclusion that phenoxy-derived species chemisorb to ZnO nanoparticles under both exposure temperatures. Second, DFT calculations indicate that electrons are transferred from ZnO to the adsorbed organic (oxidizing the Zn), the opposite direction proposed by previous descriptions of EPFR formation on metal oxides. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect