Details zur Publikation
Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.seppur.2025.134557
Titel (primär) Regeneration of the adsorption properties of hydrophobic zeolites for the treatment of diclofenac by Fenton-like process: Influence of Fenton catalyst location
Autor Domergue, L.; Georgi, A.; Schierz, A.; Cimetière, N.; Giraudet, S.; Hauchard, D.
Quelle Separation and Purification Technology
Erscheinungsjahr 2025
Department TECH
Band/Volume 379, Part 2
Seite von art. 134557
Sprache englisch
Topic T7 Bioeconomy
Supplements Supplement 1
Supplement 2
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Keywords Adsorption; Diclofenac; Fe-zeolites; Regeneration; Site-localized reaction; Water treatment
Abstract Hydrophobic zeolites are oxidation-resistant mineral adsorbents. They have homogeneous porosity and a high specific surface area. These properties make them suitable for adsorbent regeneration by wet-chemical oxidation. This process is useful for treating organic micropollutants in water. This study aims to understand the influence of hydroxyl radical ((OH)-O-center dot) formation on the regeneration of adsorption capacities of zeolites and Fe-zeolites. We use Fenton reaction-based processes for this investigation. We studied three hydrophobic faujasite-type zeolites (FAU100, FAU55, DAY) and one beta-type (BEA). The iron content in Fe-impregnated samples ranged from 1.43 to 11.9 g(Fe) kg(Z)(-1). UV-vis diffuse reflectance spectrometry revealed the presence of iron as Fe(III) in various forms. These forms include isolated ions or iron oxide clusters. A Fenton-type process was developed at fixed conditions of [H2O2](0)/[Fe](Z) = 10 and pH = 3. This process used either dissolved iron or prepared Fe-zeolites. (OH)-O-center dot formation was confirmed using a dimethylsulfoxide scavenger. Regeneration of adsorption capacities was examined for diclofenac treatment in water over three adsorption/regeneration cycles. According to the Langmuir model, regeneration yields for impregnated zeolites were 67 to 110% in the second and third cycles. Mineralization rates (T) were 59 to 75% for zeolite samples and 73 to 82% for Fe-zeolite samples. Results suggest that generating (OH)-O-center dot radicals near adsorbed pollutants enhances the efficiency of the advanced oxidation process in regenerating the adsorbent. Fe-BEA zeolite showed better performance in OH radical formation rate, selectivity, and regeneration for diclofenac adsorption. This is attributed to its higher content of isolated Fe(III) ions.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=31292
Domergue, L., Georgi, A., Schierz, A., Cimetière, N., Giraudet, S., Hauchard, D. (2025):
Regeneration of the adsorption properties of hydrophobic zeolites for the treatment of diclofenac by Fenton-like process: Influence of Fenton catalyst location
Sep. Purif. Technol. 379, Part 2 , art. 134557 10.1016/j.seppur.2025.134557