Catalytic degradation of picric acid by heterogeneous Fenton‐based processes
2011
Dulova, Niina | Trapido, Marina | Dulov, Aleksandr
The efficiency of goethite, magnetite and iron powder (Fe⁰) in catalysing the Fenton‐based oxidation of picric acid (PA) in aqueous solution was studied. The effect of pH, hydrogen peroxide concentration, and catalyst type and dosage on treatment efficacy was investigated. The adsorption of PA from aqueous solution by heterogeneous catalysts was also examined. The results demonstrated negligible PA removal in H₂O₂/α‐FeOOH and H₂O₂/Fe₃O₄ systems independent of process pH, and hydrogen peroxide and catalyst dosage. The PA adsorption effects of both iron oxides turned out to be insignificant for all studied pH values and catalyst dosages. The H₂O₂/Fe⁰ system proved efficient at degrading PA, but only under acidic conditions (pH 3). The results indicated that, due to rather fast leaching of ferrous ions from the iron powder surface, PA degradation was carried out mainly by the classic Fenton oxidation mechanism in the bulk solution. The adsorption of PA onto the iron powder surface may also contribute to the overall efficiency of PA degradation.
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