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arXiv · 2505.18211

Degradation of methylparaben by anodic oxidation, electro-Fenton, and photoelectro-Fenton using carbon felt-BDD cell

Aline B. Trench·Nihal Oturan·Aydeniz Demir·João P. C. Moura·Clément Trellu·Mauro C. Santos·Mehmet A. Oturan
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Abstract

In this study, the comparative efficiency of different electrochemical advanced oxidation processes, such as anodic oxidation with electrogenerated H2O2 (AO- H2O2), electro-Fenton (EF), and its combination with UV irradiation (photoelectron-Fenton (PEF)), was investigated for the removal of methylparaben (MP) using a carbon felt cathode and a boron-doped diamond anode. The EF process achieved a higher MP removal efficiency than the AO-H2O2 process for all applied current densities. The total organic carbon (TOC) removal after 6 h of treatment at a current density of 10 mA cm-2 reached 75.0% and 91.9% for the AO- H2O2 and EF processes, respectively. The combination of EF and UV light improved the efficiency of the EF process. The PEF process achieved a TOC removal of 84.6% in only 2 h at 5 mA cm-2 and 96.8% after 6 h of treatment. Furthermore, based on identifying oxidation reaction intermediates and short-chain carboxylic acids generated during the treatment, a reaction pathway for methylparaben mineralization by hydroxyl radicals was proposed.

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Aline B. Trench, Nihal Oturan, Aydeniz Demir, João P. C. Moura, Clément Trellu, Mauro C. Santos, Mehmet A. Oturan. 2025-05-22. Degradation of methylparaben by anodic oxidation, electro-Fenton, and photoelectro-Fenton using carbon felt-BDD cell. https://doi.org/10.1016/j.seppur.2025.133335

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