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Perfluorooctane sulfonate (PFOS) removal with Pd-0/nFe(0) nanoparticles: Adsorption or aqueous Fe-complexation, not transformation?

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dc.contributor.author Park, S es_PE
dc.contributor.author Zenobio, JE es_PE
dc.contributor.author Lee, LS es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2018
dc.description This work was funded by the Strategic Environmental Research and Development Program (ER-2426) and Cienciactiva, an initiative of CONCYTEC (grant contract number 276-2015-FONDECYT). We also wish to acknowledge Gnanasiri S. Premachandra and Chloe De Perre for their analytical chemistry support.
dc.description.abstract PFOS removal at 6 and 21 days (d) when reacted with palladium coated zero valent iron nanoparticles (Pd0/nFe0 NPs) was quantified as a function of pH (3.6, 5.5, and 8.7) and temperature (22, 45 and 70 °C). PFOS concentrations were measured in aqueous phases and NP extracts. The greatest PFOS removal occurred at 6 d with the lowest pH and highest temperature; however, recovered PFOS increased at 21 d. Furthermore, neither F− nor SO42− (from SO32− cleavage) generation was observed indicating the absence of PFOS transformation. X-ray diffraction analysis of PFOS-reacted NPs at 45 °C revealed generation of FeO(OH) on the NPs at 21 d, which was concomitant with subsequent increases in PFOS recovery. Under anaerobic conditions, strongly adsorbing Fe(OH)3 is formed which can then transform to less sorptive FeO(OH) via Fe2+ catalyzed transformation. In the process of exploring causes for apparent PFOS removal with Pd0/nFe0 NPs, PFOS as well as other perfluoroalkyl acids (PFAAs) were found to form aqueous-phase complexes with Fe(II/III) which can reduce their quantifiable levels. PFOS-Fe complexation was greater with Fe(III) and increased with Fe concentration and decreasing pH. Complexation was also greater for longer chain perfluoroalkyl acids and complexation of PFNA was greater than for PFOS.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1016/j.jhazmat.2017.08.001
dc.identifier.isi 400153500007
dc.identifier.uri https://hdl.handle.net/20.500.12390/988
dc.language.iso eng
dc.publisher Elsevier Ltd
dc.relation.ispartof Journal of Hazardous Materials
dc.rights info:eu-repo/semantics/openAccess
dc.subject Perfluoroalkyl sulfonates
dc.subject Perfluoroalkyl acids es_PE
dc.subject Iron corrosion es_PE
dc.subject Iron oxides es_PE
dc.subject Perfluoroalkyl carboxylates es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#2.05.00
dc.title Perfluorooctane sulfonate (PFOS) removal with Pd-0/nFe(0) nanoparticles: Adsorption or aqueous Fe-complexation, not transformation?
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
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