Abstract
Ferrite-modified carbonized metal-organic frameworks were prepared and employed as a gas diffusion cathode to assist the circulating electro-peroxone (EP) treatment of three mixed fluoroquinolones (FQs). The initiated reaction rates of possible reactive sites exemplified the priority of the selective removal of FQs by O3. The contributions of O3 to the oxidation of the parent FQs were over 99%, while HO was responsible for the oxidation of ozone-resistant transformation products and the total organic carbon removal. The adsorption and activation of H2O2 and O3 into HO were facilitated by abundant surface functional groups of the cathode, proper redox pairs (Fe2+/Fe3+ and Co2+/Co3+), high adsorption energy (–2.82 eV), and strong chemical bindings. The findings provided references to guide the improvement of electrocatalytic water treatment beyond limitations of conventional electrocatalysts by investigating experimentally and computationally HO formation, mass transfer, and selective removal mechanisms.
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