Activation of peroxydisulfate and peroxymonosulfate by zero-valent iron and FeCu bimetals for 4-chlorophenol oxidation in water
Year: 2024
Type: article
Abstract: This work systematically evaluates the application of disc-milled iron-copper (FeCu) bimetals for activating peroxydisulfate (PDS) and peroxymonosulfate (PMS), providing insights into both systems behavior. 4-chlorophenol (4-CP) was chosen as the model pollutant to evaluate the performance of bimetals compared to traditional iron-based activators (Fe2+ and Fe0). The influence of different factors was addressed, including i) bimetals composition (0, 5, and 50% Cu content), ii) disc-milling, and iii) bimetals concentration. FeCu bimetal with 5% Cu content showed a better synergy when combined with PMS, resulting in the highest 4-CP degradation, dechlorination, and mineralization (92%, 62%, and 60%, respectively, within 120 min). Different quenchers and PMSO were used to identify the main reactive species in the bimetallic systems, showing the production of Fe4+ with both oxidants and a relevant contribution of 1O2 in the case of PMS. Finally, the secondary effects on water quality due to iron and copper release by FeCu bimetals systems have been carefully evaluated. Adjusting the final pH to 8.0 allowed to precipitate dissolved metals and hence proved to be effective for compliance with the Italian environmental quality standards (Fe≤2 mg/L and Cu≤0.1 mg/L). Although the optimal treatment conditions are comprehensively discussed, further studies are needed for full-scale application.
Authors: Giovanni Scaggiante, Alicia Checa-Fernandez, Daniela Zingaretti, Carmen M. Dominguez, Aurora Santos, Renato Baciocchi
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,420
OpenAlex ID: W4404061869