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Kinetics of the lead ion sorption from aqueous solutions using underoxidized and overoxidized graphene oxidesстатья
Статья опубликована в журнале из списка RSCI Web of Science
Статья опубликована в журнале из перечня ВАК- Авторы: Tulupov I.V., Sosnovskikh L.E., Ibragimova V.R., Ioni Yu V., Isaev A.Yu, Galunin E.V., Shabiev F.K., Shigabaeva G.N.
- Журнал: Journal of Advanced Materials and Technologies
- Том: 10
- Номер: 3
- Год издания: 2025
- Издательство: Тамбовский государственный технический университет
- Местоположение издательства: Тамбов
- Первая страница: 215
- Последняя страница: 227
- DOI: 10.17277/jamt-2025-10-03-215-227
- Аннотация: The paper considers the kinetics of lead ions (Pb2+) sorption from model aqueous solutions using underoxidizedand overoxidized graphene oxide samples obtained from synthetic and natural (taken as comparison material) graphite.It was experimentally found that the contaminant is sorbed in the first 5 min (for the underoxidized samples) and 30 min(for the overoxidized samples), achieving a sorption capacity of 105–138 mg g–1. Moreover, the capacity of the materialincreases with an increase in its oxidation state. The capacity of the synthetic material is slightly higher than that of thenatural one. To study the removal mechanisms and determine the process parameters, the experimental data were fitted tokinetic (pseudo-first and pseudo-second order, as well as Elovich) and diffusion (internal diffusion – Morris-Weber andexternal diffusion – Boyd) models. It was found that the metal sorption is controlled by mixed diffusion of the sorbate intothe bulk of the sorbent. It was also determined that this process is limited by the chemical interaction between the sorbentand the sorbate and depends on the sorbate concentration and the ambient temperature. Besides, the surface morphology ofthe samples was studied using scanning electron microscopy, and information on their elemental composition before andafter the sorption was obtained using energy dispersive spectrometry, which confirmed the mechanism of the sorptionprocesses occurring in the systems.
- Добавил в систему: Ибрагимова Виктория Руслановна
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