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Title (Primary) Mechanistic insights into fast adsorption of perfluoroalkyl substances on carbonate-layered double hydroxides
Author Chen, Y.; Georgi, A.; Zhang, W.; Kopinke, F.-D.; Yan, J.; Saeidi, N.; Li, J.; Gu, M.; Chen, M.
Journal Journal of Hazardous Materials
Year 2021
Department TUCHEM
Volume 408
Page From art. 124815
Language 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.
Persistent UFZ Identifier 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