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Photooxidative Decomposition and Defluorination of Perfluorooctanoic Acid (PFOA) Using an Innovative Technology of UV-vis/ZnxCu1-xFe2O4/Oxalic Acid
Citation:
Verma, S., B. Mezgebe, E. Sahle-Demessie, AND M. Nadagouda. Photooxidative Decomposition and Defluorination of Perfluorooctanoic Acid (PFOA) Using an Innovative Technology of UV-vis/ZnxCu1-xFe2O4/Oxalic Acid. CHEMOSPHERE. Elsevier Science Ltd, New York, NY, 280:130660, (2021). https://doi.org/10.1016/j.chemosphere.2021.130660
Impact/Purpose:
An innovative technology of UV-vis/ZnxCu1-xFe2O4/oxalic acid as a heterogeneous photo-Fenton like the catalytic system has been demonstrated for the degradation of PFOA. This technology sets an example of the heterogeneous photo-Fenton arrangement and leading to the in-situ formation of hydroxyl radicals without the addition of H2O2 under UV irradiation. This method is a sustainable, low-cost approach for the destruction of PFAS, with the minimum formation of by-products at ambient temperatures.
Description:
Per- and polyfluoroalkyl substances (PFASs) are a large group of perfluorinated organic compounds that have been in use since the 1940s for industrial, commercial, and consumer applications. PFASs are now considered as emerging contaminants and require remedial action because of their persistent, bioaccumulative and toxic nature. Herein, we demonstrate an innovative technology of UV-vis/ZnxCu1-xFe2O4/oxalic acid for the mineralization of perfluorooctanoic acid (PFOA) in water. The magnetically retrievable nanocrystalline bimetallic ferrite catalysts, ZnxCu1-xFe2O4 (x =0.2, 0.4, 0.5, 0.6 and 0.8) have been synthesized using sol-gel auto-combustion method followed by calcination at 400 °C. The combination of ZnxCu1-xFe2O4 and oxalic acid behaves as a heterogeneous photo-Fenton like the system and leading to the generation of hydroxyl radicals without the addition of hydrogen peroxide under UV light irradiation. Further, these hydroxyl radicals have been utilized for the photo-mineralization of PFOA. Identification of the resulting organic transformation products during photodegradation of PFOA has been performed using liquid chromatography coupled with quadrupole time-of-flight mass spectroscopy (LC-QTOF-MS) analysis. Oxidative photodegradation and defluorination of PFOA have also been discussed in detail.
URLs/Downloads:
DOI: Photooxidative Decomposition and Defluorination of Perfluorooctanoic Acid (PFOA) Using an Innovative Technology of UV-vis/ZnxCu1-xFe2O4/Oxalic Acid
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