In:
Perspektivnye Materialy, Intercontact Science, Vol. 1 ( 2022), p. 34-48
Abstract:
The paper describes the extraction of the rare earth element Sm3+ from aqueous buffer systems by a graphene-based nanostructured composite, modified using an organic polymer – polyhydroquinone. The authors determined the important parameters of the sorption-desorption of Sm3+ ions on a new nanocomposite “graphene oxide/polyhydroquinone” during a batch test, such as: initial concentration, the sorbent weight, pH of the solution, sorption rate constants, maximum sorption capacity of the nanocomposite, percentage sorption and desorption, entropy and enthalpy of the Sm3+ extraction process. The kinetic, isothermal and thermodynamic dependences allowed to propose of the Sm3+ ions adsorption mechanisms. The kinetic data were processed by pseudo-first- and second-order, Elovich and intraparticle diffusion models, and adsorption isotherms — using the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich equations. As a result of kinetic studies, the contact time of the samarium adsorption was determined — 15 min, while the sorption capacity was 100 mg·g–1. It was found that the absorption of Sm3+ ions proceeds by a mixed diffusion mechanism and limited by the interaction “samarium ions : sorbent functional groups”. According to the Langmuir model, the maximum sorbent sorption capacity was 333.3 mg·g–1. Thus, the high efficiency of the developed graphene oxide/polyhydroquinone nanocomposite for purification of aqueous media from rare earth elements was confirmed.
Type of Medium:
Online Resource
ISSN:
1028-978X
Uniform Title:
Сорбционно-десорбционные свойства нанокомпозита оксид графена/полигидрохинон при извлечении редкоземельного элемента Sm (III) из уксусно-ацетатных буферных систем
DOI:
10.30791/1028-978X-2022-1
DOI:
10.30791/1028-978X-2022-1-34-48
Language:
Unknown
Publisher:
Intercontact Science
Publication Date:
2022
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