Thermal treatment of plasma-synthesized goethite improves Fenton-like degradation of orange II dye
| Autor: | Serge Nzali, Antoine Tiya-Djowe, Samuel Laminsi, Eric M. Gaigneaux, Estella Tamungang Njoyim |
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| Rok vydání: | 2016 |
| Předmět: |
Goethite
Scanning electron microscope Chemistry Inorganic chemistry Iron oxide 02 engineering and technology Thermal treatment Hematite 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Catalytic oxidation visual_art Specific surface area visual_art.visual_art_medium Environmental Chemistry 0210 nano-technology |
| Zdroj: | Environmental Chemistry Letters. 14:515-519 |
| ISSN: | 1610-3661 1610-3653 |
| DOI: | 10.1007/s10311-016-0578-y |
| Popis: | Various iron oxides are used for Fenton reactions to degrade organic pollutants. The degradation efficiency may be improved by transforming an iron oxide phase to another. Here, we report on the transformation of goethite into hematite by thermal treatment at 400 °C. The products were analyzed by X-ray diffractometry, Raman spectroscopy, scanning electron microscopy and N2-physisorption. The catalytic activities were measured for orange II bleaching at initial concentration of 25 mg L−1, pH 3, catalyst concentration of 0.2 g L−1; 5 mM H2O2, 30 °C. Results show that the synthesized goethite was successfully transformed into hematite, and the specific surface area of the material increased from 134 to 163 m2 g−1. The bleaching efficiency of the orange II dye reached 100 % for the hematite product, versus 78 % for goethite. Therefore, a moderate thermal treatment of a plasma-synthesized goethite improves the catalytic oxidation of organic pollutants. |
| Databáze: | OpenAIRE |
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