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  • Title: Heterogeneous Fenton-like degradation of an azo dye reactive brilliant orange by the combination of activated carbon-FeOOH catalyst and H(2)O(2).
    Author: Wu J, Lin G, Li P, Yin W, Wang X, Yang B.
    Journal: Water Sci Technol; 2013; 67(3):572-8. PubMed ID: 23202562.
    Abstract:
    The decoloration of an azo dye reactive brilliant orange (X-GN) by a heterogeneous Fenton system using activated carbon-FeOOH catalyst (AC-FeOOH) and H(2)O(2) was studied. Under typical conditions (pH 7.0, H(2)O(2) 10 mmol/L, AC-FeOOH 1.0 g/L and 30 °C), 98% decoloration rate of X-GN was achieved in 240 min. The decoloration efficiency of X-GN increased with higher H(2)O(2) dosage, higher AC-FeOOH dosage and higher reaction temperature. Though the catalytic reaction was an acid driven process, a sufficient decoloration performance was still obtained in neutral and alkaline conditions. Kinetic studies suggested that the decoloration of X-GN followed a pseudo-first order reaction and the activation energy was 17.2 kJ/mol. Iron leaching from AC-FeOOH occurred during the reaction, but the decoloration efficiency of X-GN was still higher than 80% after four runs. The AC-FeOOH has a good stability and can be reused. Besides, the generation of massive iron-containing sludge can be avoided after reaction as the remaining ferric ions in the solution were less than 1 mg/L in this combined H(2)O(2) and AC-FeOOH process.
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