Preparation and characterization of oxidized graphene for actinides and rare earth elements removal in nitric acid solutions from nuclear wastes

Ali, Imran; Zakharchenko, E. A.; Myasoedova, G. V.; Molochnikova, N. P.; Rodionova, Anastasiya A.; Баулин, В. Е.; Burakov, Alexander E.; Burakova, I. V.; Babkin, Alexander V.; Neskoromnaya, E. A.; Melezhik, A. V.; Ткачев, А. Г.; Habila, Mohamed A.; El‐Marghany, Adel; Sheikh, Mohamed; Ghfar, Ayman A.

doi:10.1016/j.molliq.2021.116260

Cited by 39 publications

(11 citation statements)

References 48 publications

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“…11 Indeed, many works have considered GO for heavy metal, actinide, and rare earth separations using bulk experimental techniques. 5,6,8,[12][13][14][15][16][17] The ion-GO interactions that guide separations occur in the confined region between the GO surface and the subphase. However, few works have specifically considered ion and water interactions with GO in this interfacial region, 18,19 and fewer have probed the interface directly experimentally.…”

Section: Introductionmentioning

confidence: 99%

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Carr

Lee

Kumal

et al. 2022

Preprint

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Graphene oxide (GO) membranes are excellent candidates for a range of applications, including rare earth separations and radionuclide decontamination. Membrane performance varies widely under different conditions, as water and ion interactions with the membrane are strongly affected by small system changes. Feed solution pH is one critical factor, as pH, GO surface functionality, and ion speciation are interconnected parameters that cannot be controlled individually. Understanding nanoscale water and ion behavior near interfacial GO is critical for groundbreaking membrane advances, including improved selectivity and permeability. We experimentally examine the impact of solution conditions on water and lanthanide interactions with self-assembled GO films and connect these results to GO membrane performance. The investigation of the confined films at the air-water interface with a combination of surface-specific spectroscopy and X-ray scattering techniques allows us to understand water and ion behaviors separately. Sum frequency generation spectroscopy reveals a dramatic change in interfacial water organization because of graphene oxide film deprotonation. Interfacial X-ray fluorescence measurements show a 17x increase in adsorbed lanthanide to the GO film from subphase pH 3 to pH 9. Liquid surface X-ray reflectivity data show an additional 2.7 e- per Å2 for GO films at pH 9 versus pH 3 as well. These data are connected to GO membrane performance, which show increased selectivity and decreased flux for membranes filtering pH 9 solutions. We posit insoluble lanthanide hydroxides form at higher pHs. Take together, these results highlight the importance of interfacial experiments on model GO systems.

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Section: Introductionmentioning

confidence: 99%

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Carr

Lee

Kumal

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Graphene oxide (GO) is a promising membrane − and sorbent candidate for applications including rare earth separations, , desalination, and radionuclide decontamination from groundwater, ,− as it boasts the unique robustness of graphene with useful oxygen-based functional groups . Indeed, many works have considered GO for heavy metal, actinide, and rare earth separations using bulk experimental techniques. ,,,− Others have utilized lanthanide metals to control the interlayer spacing within GO members and have reported significant improvements in GO filtration . The ion–GO interactions that guide these separations and insertions occur in the confined region between the GO surface and the subphase.…”

mentioning

confidence: 99%

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Carr

Lee

Kumal

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Graphene oxide (GO) membranes are excellent candidates for a range of separation applications, including rare earth segregation and radionuclide decontamination. Understanding nanoscale water and ion behavior near interfacial GO is critical for groundbreaking membrane advances, including improved selectivity and permeability. We experimentally examine the impact of solution conditions on water and lanthanide interactions with interfacial GO films and connect these results to GO membrane performance. The investigation of the confined films at the air− water interface with a combination of surface-specific spectroscopy and X-ray scattering techniques allows us to understand water and ion behaviors separately. Sum frequency generation spectroscopy reveals a dramatic change in interfacial water organization because of graphene oxide film deprotonation. Interfacial X-ray fluorescence measurements show a 17× increase in adsorbed lanthanide to the GO film from subphase pH 3 to pH 9. Liquid surface X-ray reflectivity data show an additional 2.7 e − per Å 2 for GO films at pH 9 versus pH 3 as well. These results are connected to GO membrane performance, which show increased selectivity and decreased flux for membranes filtering pH 9 solutions. We posit insoluble lanthanide hydroxides form at higher pHs. Taken together, these results highlight the importance of interfacial experiments on model GO systems.

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“…6 Pollutant adsorption often employs highly efficient materials with unique structures and functional properties, such as oxidized graphene and its modified materials, polyhydroquinone/graphene, iron modified activated carbon, and others. [7][8][9][10] Adsorption activity decreases when the adsorbent is saturated with pollutants, meaning that the adsorbent requires disposal. 11 It is therefore important to develop efficient methods to regenerate the adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ce–Ni/sepiolite with excellent adsorption and catalytic oxidation performance toward dyes

et al. 2023

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Preparation and characterization of oxidized graphene for actinides and rare earth elements removal in nitric acid solutions from nuclear wastes

Cited by 39 publications

References 48 publications

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Synthesis of Ce–Ni/sepiolite with excellent adsorption and catalytic oxidation performance toward dyes

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