Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.jhazmat.2020.124815 |
| Volltext | Akzeptiertes Manuskript |
| Titel (primär) | Mechanistic insights into fast adsorption of perfluoroalkyl substances on carbonate-layered double hydroxides |
| Autor | Chen, Y.; Georgi, A.; Zhang, W.; Kopinke, F.-D.; Yan, J.; Saeidi, N.; Li, J.; Gu, M.; Chen, M. |
| Quelle | Journal of Hazardous Materials |
| Erscheinungsjahr | 2021 |
| Department | TUCHEM |
| Band/Volume | 408 |
| Seite von | art. 124815 |
| Sprache | englisch |
| Topic | T7 Bioeconomy |
| Keywords | LDHs; PFOS; PFOA; Adsorption kinetics; Adsorbent regeneration |
| Abstract | Layered double hydroxide (LDH) with the metal composition of Cu(II)Mg(II)Fe(III) was prepared as an adsorbent for fast adsorption of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA). 84% of PFOS and 48% of PFOA in relation to the equilibrium state were adsorbed in the first minutes of contact with 0.1 g/L of suspended µm-sized LDH particles. The adsorption mechanisms of PFOS and PFOA on the CuMgFe-LDH were interpreted. Hydrophobic interactions were primarily responsible for the adsorption of these compounds in accordance with the different adsorption affinities of long-chain (C8, Kd = 105 L/kg) and short-chain (C4, Kd = 102 L/kg) perfluorinated carboxylic acids. PFOA adsorption on CuMgFe-LDH was strongly suppressed under alkaline conditions while PFOS uptake was only slightly affected in the pH range from 4.3 to 10.7, indicating a significant role of electrostatic interactions for PFOA adsorption. The adsorption of PFOS and PFOA was rather insensitive to competition by monovalent anions. The previously reported ‘memory effect’ of calcined CuMgFe-LDH for sorption of organic anions was not confirmed in the present study. Spent CuMgFe-LDH could be easily regenerated by extraction with 50 vol.% methanol in water within 1 h and maintained a high PFOS removal in subsequent usage cycles. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24018 |
| Chen, Y., Georgi, A., Zhang, W., Kopinke, F.-D., Yan, J., Saeidi, N., Li, J., Gu, M., Chen, M. (2021): Mechanistic insights into fast adsorption of perfluoroalkyl substances on carbonate-layered double hydroxides J. Hazard. Mater. 408 , art. 124815 10.1016/j.jhazmat.2020.124815 |
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