Iron oxide nanoparticles supported on diamond nanoparticles as efficient and stable catalyst for the visible light assisted Fenton reaction
[EN] Iron oxide nanoparticles (Fe-ox NPs) have been supported on the hydroxylated surface of modified diamond nanoparticles (D3). Characterization data show that, once formed, Fe NPs are spontaneously oxidized under ambient conditions, exhibiting a good dispersion of small oxidized Fe-ox NPs (2.2 +/...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/122277 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/122277 |
| Access Level: | acceso abierto |
| Palabra clave: | Heterogeneous catalysis PhotoFenton reaction Waste water treatment Iron oxide nanoparticles Diamond nanoparticles QUIMICA ORGANICA |
| Sumario: | [EN] Iron oxide nanoparticles (Fe-ox NPs) have been supported on the hydroxylated surface of modified diamond nanoparticles (D3). Characterization data show that, once formed, Fe NPs are spontaneously oxidized under ambient conditions, exhibiting a good dispersion of small oxidized Fe-ox NPs (2.2 +/- 0.5 nm) on D3. It has been observed that the activity of Fe-ox/D3 as heterogeneous Fenton catalyst for phenol degradation by H2O2 can be assisted by visible light irradiation. Fe-ox/D3 exhibits a superior activity compared with analogous catalysts based on activated carbon, graphite or the benchmark Fe-ox/TiO2 photocatalyst. Fe-ox/D3 exhibits comparable activity to Ag/D3 that is one of the most active catalysts ever reported for this reaction. In addition, Fe-ox/D3 presents higher stability and recyclability than analogous Cu/D3. A minimum accumulated turnover number of 38,000 can be achieved using Fe-ox/D3 as photocatalyst. The heterogeneous photoFenton process using phenol as model pollutant and Fe-ox/D3 as catalyst under visible light irradiation can be implemented prior to an aerobic biological treatment resulting in a biodegradable effluent which lacks ecotoxicity, as determined by measurement of the biological oxygen demand. Transient absorption spectroscopy provides evidence in support of the formation upon irradiation of Fe-ox/D3 of photogenerated charge separation state attributed to electrons and holes. Electron paramagnetic resonance and selective quenching experiments indicate that hydroxyl radicals are the main reactive oxygen species generated in the photo-assisted Fenton reaction promoted by Fe-ox/D3. |
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