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Neutron reflectivity for testing graphene oxide films sorption of EuCl3 in ethanol solution
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-8438-2581
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3881-6764
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, Dresden, Germany; The Rossendorf Beamline at ESRF, The European Synchrotron, Grenoble Cedex 9, France.
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2024 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951Article in journal (Refereed) Epub ahead of print
Abstract [en]

Neutron reflectivity (NR) was used to study the sorption of Eu(III) by graphene oxide (GO) films exposed to ethanol solution of EuCl3. Most of the earlier sorption studies have been performed using GO dispersed in solution. In contrast, layered structure of GO films imposes limitations for penetration of ions between individual sheets. The analysis of NR data recorded before and after sorption under vacuum demonstrates an increase of GO film thickness due to sorption by 35–40%. The characterization of chemical state of Eu(III) sorbed by GO films by X-ray absorption near-edge structure (XANES) in high-energy resolution fluorescence detection (HERFD) method at the Eu L3 edge reveals that it remains the same as in anhydrous EuCl3. Analysis of all collected data including reference experiments with bulk GO samples allows to conclude that EuCl3 penetrates into GO interlayers with ethanol solution and remains trapped in interlayers after evaporation of ethanol. Sorption of EuCl3 results in nearly complete amorphization of film and likely formation of voids, thus making NR models based on specific volume of unit cell not valid for quantitative evaluation of Eu sorption. Limitations of NR method must be taken into account in future studies of sorption by thin films.

Place, publisher, year, edition, pages
John Wiley & Sons, 2024.
Keywords [en]
graphene oxides, lanthanides, neutron reflectivities
National Category
Condensed Matter Physics Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-223479DOI: 10.1002/pssb.202400069ISI: 001199666100001Scopus ID: 2-s2.0-85189887182OAI: oai:DiVA.org:umu-223479DiVA, id: diva2:1852891
Funder
Swedish Energy Agency, 50620-1ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 23-275Available from: 2024-04-19 Created: 2024-04-19 Last updated: 2024-04-22

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Nordenström, AndreasBoulanger, NicolasTalyzin, Aleksandr V.

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