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Distribution of Gd(III) ions at the graphene oxide/water interface

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dc.contributor.author Amirov R.
dc.contributor.author Shayimova J.
dc.contributor.author Dimiev A.
dc.date.accessioned 2019-01-22T20:32:56Z
dc.date.available 2019-01-22T20:32:56Z
dc.date.issued 2018
dc.identifier.issn 0021-9797
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/147662
dc.description.abstract © 2018 Elsevier Inc. Graphene oxide (GO) have emerged recently as a novel material for sorbing metal cations from aqueous media. However, the literature data on sorption capacity differ by more than one order in magnitude, and the nature of the chemical bonding between GO and metal cations remains unclear. In this work we show that Gd3+ ions are bound to GO by both coordinate-covalent bonding and electrostatic attraction with prevailing the former. We provide the complete account for the GO sorption toward Gd3+ as the function of the Gd3+/GO ratio and pH of solution. The upper limits of the strong bonding are determined as 0.70 and 0.16 mmol(Gd3+)/g(GO) in the neutral and in the intrinsically acidic solutions, respectively. At large excess of Gd3+ in the neutral solutions, the sorption capacity reaches 1.45 mmol(Gd3+)/g(GO). The effectiveness of water, hydrochloric acid and EDTA as desorbing eluents is compared. We experimentally demonstrate the existence of the Gd3+ concentration gradient within the diffuse layer at the GO/water interface, and its exponential character on the distance from the GO surface. The thickness of the diffuse layer and the position of the slipping plane are estimated. Such characteristics, typical for colloid systems, show that in solutions, GO flakes form distinct phase, even though they are just one atom thick.
dc.relation.ispartofseries Journal of Colloid and Interface Science
dc.subject Adsorption
dc.subject Diffuse layer
dc.subject Gd(III) ions
dc.subject Graphene oxide solutions
dc.subject NMR relaxation
dc.title Distribution of Gd(III) ions at the graphene oxide/water interface
dc.type Article
dc.relation.ispartofseries-volume 527
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 222
dc.source.id SCOPUS00219797-2018-527-SID85048732576


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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