Combined electro-fenton and anodic oxidation processes at a sub-stoichiometric titanium oxide (Ti4 o7) ceramic electrode for the degradation of tetracycline in water

Busisiwe N. Zwane, Benjamin O. Orimolade, Babatunde A. Koiki, Nonhlangabezo Mabuba, Chaimaa Gomri, Eddy Petit, Valérie Bonniol, Geoffroy Lesage, Matthieu Rivallin, Marc Cretin, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The mineralization of tetracycline by electrochemical advanced oxidation processes (EAOPs) as well as the study of the toxicity of its intermediates and degradation products are pre-sented. Electro-Fenton (EF), anodic oxidation (AO), and electro-Fenton coupled with anodic oxidation (EF/AO) were used to degrade tetracycline on carbon felt (cathode) and a sub-stoichiometric titanium oxide (Ti4 O7) layer deposited on Ti (anode). As compared to EF and AO, the coupled EF/AO system resulted in the highest pollutant removal efficiencies: total organic carbon removal was 69 ± 1% and 68 ± 1%, at 20 ppm and 50 ppm of initial concentration of tetracycline, respectively. The effect of electrolysis current on removal efficiency, mineralization current efficiency, energy consumption, and solution toxicity of tetracycline mineralization were investigated for 20 ppm and 50 ppm tetracycline. The EF/AO process using a Ti4 O7 anode and CF cathode provides low energy and high removal efficiency of tetracycline caused by the production of hydroxyl radicals both at the surface of the non-active Ti4 O7 electrode and in solution by the electro-Fenton process at the cathodic carbon felt. Complete removal of tetracycline was observed from HPLC data after 30 min at optimized conditions of 120 mA and 210 mA for 20 ppm and 50 ppm tetracycline concentra-tions. Degradation products were elucidated, and the toxicity of the products were measured with luminescence using Microtox® bacteria toxicity test.

Original languageEnglish
Article number2772
JournalWater (Switzerland)
Volume13
Issue number19
DOIs
Publication statusPublished - 1 Oct 2021

Keywords

  • Anodic oxidation
  • Carbon felt
  • Electro-Fenton process
  • TOC removal efficiency
  • Tetracycline
  • Ti O-ceramic anode

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Biochemistry
  • Aquatic Science
  • Water Science and Technology

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