Speaker
Description
Coumarin is widely used in cosmetics and pharmaceuticals, has emerged as a persistent and potentially toxic contaminant. This study investigates coumarin degradation using a modified fountain dielectric barrier discharge (MF-DBD) plasma reactor, operated alone and in combination with WO₃, WO₃–ZnO, and ZnO catalysts. Under identical conditions (16 mg/L, atmospheric air pressure, 0–65 min), plasma treatment achieved 95% degradation, primarily via •OH-mediated oxidation. Incorporating catalysts significantly enhanced degradation kinetics and mineralization. WO₃ promoted reactive oxygen species (ROS) generation, while ZnO improved pH stability. The WO₃–ZnO composites exhibited composition-dependent synergy, achieving >97% removal efficiency, with Plasma + WO₃ showing the highest performance (99.9% degradation, 84% TOC reduction). The results highlight the strong plasma–catalyst coupling effect and demonstrate MF-DBD plasma systems as efficient, green technologies for treating recalcitrant organic pollutants.
Keywords:
Dielectric Barrier Discharge; Plasma–Photocatalysis; WO₃–ZnO Composite; Coumarin Degradation; Advanced Oxidation Process
Acknowledgement
Funded by the EUNextGeneration EU through the Recovery and Resilience Plan for Slovakia under project No 09I03–03-V04–00373
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