4.5 Article

Degradation of Atenolol with Electrochemical Oxidation at Mixed Metal Oxide Electrodes Assisted by UV Photolysis

Journal

CLEAN-SOIL AIR WATER
Volume 46, Issue 4, Pages -

Publisher

WILEY
DOI: 10.1002/clen.201700077

Keywords

active chlorine; advanced oxidation processes; degradation pathway; electrolysis

Funding

  1. International Science and Technology Cooperation Program of China [2016YFE0123700]

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Electrochemical oxidation has drawn considerable research attention for the destruction of organic contaminants. This study utilizes the combination of electrolysis and the UV photolysis process to degrade the beta-blocker atenolol (ATL). The results show that the combination of electrolysis and UV photolysis is superior to a single process alone based on the removal rates of ATL and electrical efficiency per order (EE/O). In situ electrogenerated chlorine is confirmed to be responsible for ATL degradation with NaCl electrolytes, and mixed metal oxide (MMO) anodes play a more significant role in the generation of active chlorine than platinum (Pt) anodes. Moreover, reactive species (hydroxyl radical (OH)-O-center dot and chlorine radical Cl-center dot) mainly contributed to ATL degradation during the photo-electrolysis process. Increasing the concentration of NaCl electrolytes and applied current densities can enhance the ATL degradation. Finally, major intermediate products are identified, and a possible degradation pathway of ATL is proposed during the photo-electrolysis processes. This study demonstrates that the photo-electrolysis process can be considered as a potential technology for the destruction of pharmaceutical pollutants in water.

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