Thermal treatment of plasma-synthesized geothite improves Fenton-like degradation of orange II dye
(2016) Environmental Chemistry Letters — Vol. 14, p. 515-519 (2016)
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- Abstract
- 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.
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Tiya Djowe, A., Nzali, S., Njoyim, E. T., Laminsi, S., & Gaigneaux, E. (2016). Thermal treatment of plasma-synthesized geothite improves Fenton-like degradation of orange II dye. Environmental Chemistry Letters, 14, 515-519. https://doi.org/10.1007/s10311-016-0578-y (Original work published 2016)