Insight into the catalytic mechanism of γ-Fe2O3/ZnFe2O4 for hydrogen peroxide activation under visible light
| Autor: | Shengtao Xing, Yuan Ma, Qing Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Chemistry
02 engineering and technology Electron Orange (colour) 010402 general chemistry 021001 nanoscience & nanotechnology Mass spectrometry Photochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis law.invention Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry law 0210 nano-technology Hydrogen peroxide Mesoporous material Electron paramagnetic resonance Visible spectrum |
| Zdroj: | Journal of Colloid and Interface Science. 529:247-254 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2018.06.020 |
| Popis: | Magnetic γ-Fe2O3 supported on mesoporous ZnFe2O4 was synthesized by impregnation and deposition–precipitation methods. The obtained γ-Fe2O3/ZnFe2O4 was found to be an effective catalyst for the degradation and mineralization of Orange II with H2O2 under visible light irradiation, which can be attributed to the enhanced production of OH and particularly O2−. The catalytic mechanism of γ-Fe2O3/ZnFe2O4 for H2O2 activation and the degradation pathway of Orange II were investigated. The result indicates that the loaded γ-Fe2O3 could capture the electrons in the conductive band of ZnFe2O4, thus promoting the formation of O2− from the reaction between H2O2 and holes. Meanwhile, the formed Fe2+ and electrons could react with H2O2 to produce OH. According to the results of liquid chromatography-mass spectrometry, electron paramagnetic resonance and scavenger experiments, Orange II should be mainly degraded by O2− but not OH due to the destruction of azo bond, while its intermediates were further mineralized by O2− and OH. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect