Heterogeneous Fenton-like discoloration of methyl orange using Fe₃O₄/MWCNTs as catalyst: kinetics and Fenton-like mechanism

Abstract

The kinetics and Fenton-like mechanism are two challenging tasks for heterogeneous Fenton-like catalytic oxidation of organic pollutants. In this study, three kinetic models were used for the kinetic studies of Fe₃O₄/MWCNTs-H₂O₂ Fenton-like reaction for MO degradation. The results indicated that this reaction followed the first-order kinetic model. The relationship of reaction rate constant and temperature followed the Arrhenius equation. The activation energy and frequency factor of this system were calculated as 8.2 kJ·mol⁻¹ and 2.72 s⁻¹, respectively. The quantifications of Fe ions dissolution and •OH radicals generation confirmed that the homogeneous and heterogeneous catalyses were involved in Fe₃O₄/MWCNTs-H₂O₂ Fenton-like reaction. The reaction rate constant was closely related with Fe ions dissolution and •OH radicals generation. Fe₃O₄/MWCNTs nanocomposites had typical ferromagnetic property and could be easily separated from solution by an external magnet after being used. Furthermore, Fe₃O₄/MWCNTs nanocomposites exhibited good stability and recyclability. Finally, the Fenton-like mechanisms on homogeneous and heterogeneous catalyses were described.

Keywords

MWCNTs / Fe ₃O ₄ NPs / kinetics / •OH radicals / Fenton-like mechanism

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