Phenol degradation by Fenton-like process
2016
Sarmento, Antover Panazzolo | Borges, Alisson Carraro | de Matos, Antonio Teixeira | Romualdo, Lincoln Lucílio
The main objective of this study was to investigate the optimum conditions for the Fenton-like process on phenol degradation, using Mn²⁺ as a supporting catalyst in the Fenton reaction. The effect of the independent factors [H₂O₂], [Fe²⁺], [Mn²⁺] and t (reaction time) was evaluated on the efficiency of phenol degradation at two pHs (3 and 5). The experimental arrangement adopted was the Box-Behnken delineation, with the phenol concentration after the treatments suggested as response variable. At less acidic pH (5), regardless of [Mn²⁺], it was observed that the conventional Fenton process was the most efficient alternative, considering the optimum condition: 2.65 mmol L⁻¹ for [H₂O₂], 0.36 mmol L⁻¹ for [Fe²⁺], and 90 min for t. It was observed that the addition of Mn²⁺ helped the phenol degradation at more acidic pH (3), obtaining the optimum condition: 6.17 mmol L⁻¹ for [H₂O₂], 0.36 mmol L⁻¹ for [Fe²⁺], 1.09 mmol L⁻¹ for [Mn²⁺], and 90 min for t.
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