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Super-oxidized “activated graphene” as 3D analogue of defect graphene oxide: oxidation degree vs U(VI) sorption
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3881-6764
Umeå University, Faculty of Science and Technology, Department of Physics.
Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russian Federation.
Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russian Federation.
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2023 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 457, article id 131817Article in journal (Refereed) Published
Abstract [en]

Porous carbons are not favorable for sorption of heavy metals and radionuclides due to absence of suitable binding sites. In this study we explored the limits for surface oxidation of “activated graphene” (AG), porous carbon material with the specific surface area of ∼2700 m2/g produced by activation of reduced graphene oxide (GO). Set of “Super-Oxidized Activated Graphene” (SOAG) materials with high abundance of carboxylic groups on the surface were produced using “soft” oxidation. High degree of oxidation comparable to standard GO (C/O=2.3) was achieved while keeping 3D porous structure with specific surface area of ∼700–800 m2/. The decrease in surface area is related to the oxidation-driven collapse of mesopores while micropores showed higher stability. The increase in the oxidation degree of SOAG is found to result in progressively higher sorption of U(VI), mostly related to the increase in abundance of carboxylic groups. The SOAG demonstrated extraordinarily high sorption of U(VI) with the maximal capacity up to 5400 μmol/g, that is 8.4 – fold increase compared to non-oxidized precursor AG, ∼50 –fold increase compared to standard graphene oxide and twice higher than extremely defect-rich graphene oxide. The trends revealed here show a way to further increase sorption if similar oxidation degree is achieved with smaller sacrifice of surface area.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 457, article id 131817
Keywords [en]
Absorbent, Carbon material, Chemical modification, Porous carbon, Uranium
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-211159DOI: 10.1016/j.jhazmat.2023.131817PubMedID: 37327606Scopus ID: 2-s2.0-85162138335OAI: oai:DiVA.org:umu-211159DiVA, id: diva2:1781054
Funder
EU, Horizon 2020, 881603Available from: 2023-07-07 Created: 2023-07-07 Last updated: 2023-07-07Bibliographically approved

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Boulanger, NicolasLi, GuiTalyzin, Aleksandr V.

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