Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/acsestengg.3c00462
Lizenz creative commons licence
Titel (primär) A deep insight into perfluorooctanoic acid photodegradation using metal ion-exchanged zeolites
Autor Qian, L.; Zhao, H.; Schierz, A.; Mackenzie, K. ORCID logo ; Georgi, A.
Quelle ACS ES&T Engineering
Erscheinungsjahr 2024
Department TECH
Band/Volume 4
Heft 3
Seite von 748
Seite bis 757
Sprache englisch
Topic T7 Bioeconomy
Keywords perfluorooctanoic acid; Fe-zeolites; ion-exchanged zeolites; photochemistry; degradation
Abstract Treating perfluorooctanoic acid (PFOA) in an aqueous environment is problematic due to its low concentration and its high resistance to biological and chemical degradation. To tackle this challenge, combinations of pre-enrichment and photodegradation processes are promising solutions. In this work, we investigated metal ion-exchanged zeolites as adsorbents and photocatalysts for PFOA treatment. Among various transition metal ion-exchanged BEA zeolites, Fe-exchanged BEA (Fe-BEA) zeolites showed significant activity for the photodegradation of PFOA. The isolated iron species in Fe-BEA zeolite are responsible for PFOA photodegradation, whereas other iron species present from excess iron loading in the zeolite will lower its photocatalytic activity. Furthermore, it was proved via size exclusion tests using branched PFOA isomers that the photodegradation of PFOA took place on the internal surface rather than the external surface of Fe-BEA zeolite. Photodegradation of PFOA was also tested to be effective with Fe-exchanged BEA-type zeolites having various SiO2/Al2O3 ratios, but ineffective with FAU-type zeolites. The optimal Fe-BEA zeolite showed a sorption coefficient Kd of 6.0 × 105 L kg–1 at an aqueous phase PFOA concentration of 0.7 μg L–1 and a PFOA half-life of 1.8 h under UV-A irradiation. The presented study offers a deeper understanding of the use of metal ion-exchanged zeolites for photodegradation of PFOA.
dauerhafte UFZ-Verlinkung
Qian, L., Zhao, H., Schierz, A., Mackenzie, K., Georgi, A. (2024):
A deep insight into perfluorooctanoic acid photodegradation using metal ion-exchanged zeolites
ACS ES&T Eng. 4 (3), 748 - 757 10.1021/acsestengg.3c00462