Super-oxidized “activated graphene” as 3D analogue of defect graphene oxide: oxidation degree vs U(VI) sorption

Super-oxidized “activated graphene” as 3D analogue of defect graphene oxide : oxidation degree vs U(VI) sorption

Bakhiia, Tamuna (author): Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russian Federation

Maslakov, Konstantin I. (author): Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russian Federation

Romanchuk, Anna Yu. (author): Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russian Federation

Kalmykov, Stepan N. (author): Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russian Federation

Talyzin, Aleksandr V., 1969- (author): Umeå universitet,Institutionen för fysik

(creator_code:org_t)

Elsevier, 2023
2023
English.
In: Journal of Hazardous Materials. - : Elsevier. - 0304-3894 .- 1873-3336. ; 457

Related links:: https://doi.org/10.1...; show more...; https://umu.diva-por... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: Boulanger, Nicol ...; Li, Gui; Bakhiia, Tamuna; Maslakov, Konsta ...; Romanchuk, Anna ...; Kalmykov, Stepan ...; show more...; Talyzin, Aleksan ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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