Pervaporation desalination with graphene oxide membranes: The influence of cation type and loading

Gurianov, Konstantin E.; Eliseev, Andrei A.; Brotsman, Victor A.; Poyarkov, A.A.; Ryzhov, I.A.; Zotov, T.A.; Chumakov, Andrei; Petukhov, Dmitrii I.

doi:10.1016/j.desal.2022.116238

Cited by 16 publications

(5 citation statements)

References 42 publications

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“…With similar salt rejection rates (99.98%) to those in Zhan’s study [ 57 ], Gurianov et al [ 58 ] reported a rejection rate as high as 99.9% using modified GO membranes. In this work, the authors proposed the use of carbon-like spacers (such as fullerenols and nanoribbons) to modify the interlayer of GO.…”

Section: Ongoing Studies In 2d Materials For Composite Pv Membrane Fa...supporting

confidence: 66%

“…The outstanding performance was credited to the polyethylen-imine intercalation, which broadened the interlayer spacing to decrease the transport resistance of the membrane while inducing the formation of more amide bonding and thus reducing the permeable void space of the membrane. With similar salt rejection rates (99.98%) to those in Zhan's study [57], Gurianov et al [58] reported a rejection rate as high as 99.9% using modified GO membranes. In this work, the authors proposed the use of carbon-like spacers (such as fullerenols and nanoribbons) to modify the interlayer of GO.…”

Section: Seawater Desalination and Water Purificationsupporting

confidence: 57%

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Composite 2D Material-Based Pervaporation Membranes for Liquid Separation: A Review

Castro-Muñoz

2024

Molecules

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Today, chemistry and nanotechnology cover molecular separations in liquid and gas states by aiding in the design of new nano-sized materials. In this regard, the synthesis and application of two-dimensional (2D) nanomaterials are current fields of research in which structurally defined 2D materials are being used in membrane separation either in self-standing membranes or composites with polymer phases. For instance, pervaporation (PV), as a highly selective technology for liquid separation, benefits from using 2D materials to selectively transport water or other solvent molecules. Therefore, this review paper offers an interesting update in revising the ongoing progress of PV membranes using 2D materials in several applications, including solvent purification (the removal of water from organic systems), organics removal (the removal of organic molecules diluted in water systems), and desalination (selective water transport from seawater). In general, recent reports from the past 3 years have been discussed and analyzed. Attention has been devoted to the proposed strategies and fabrication of membranes for the inclusion of 2D materials into polymer phases. Finally, the future trends and current research gaps are declared for the scientists in the field.

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Section: Ongoing Studies In 2d Materials For Composite Pv Membrane Fa...supporting

confidence: 66%

Section: Seawater Desalination and Water Purificationsupporting

confidence: 57%

Composite 2D Material-Based Pervaporation Membranes for Liquid Separation: A Review

Castro-Muñoz

2024

Molecules

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“…Generally, the tendency of diminishing GO interlayer spacing follows the increase of ionic strength and reducing the size of hydrated ions. With this data, one can suspect an equilibrium interlayer distance in free-standing GO to be determined by electrostatic forces between negatively charged GO flakes and hydrated cations located in the interlayer space. ,, This makes cation-intercalated GO structures very similar to many other colloid systems, exhibiting variation of interparticle distances on pH and ionic strength tending to doubled Stern layer thickness at high concentration …”

mentioning

confidence: 95%

“…With this data, one can suspect an equilibrium interlayer distance in free-standing GO to be determined by electrostatic forces between negatively charged GO flakes and hydrated cations located in the interlayer space. 33,36,37 This makes cation-intercalated GO structures very similar to many other colloid systems, exhibiting variation of interparticle distances on pH and ionic strength tending to doubled Stern layer thickness at high concentration. 38 To reveal the key factors influencing the equilibrium interlayer distance of GO, an extensive correlation analysis of d-spacing on various characteristics of cations was performed, including cation radius, aquated cation size, hydration energy, cation iconicity (z 2 /r), 39 or polarizability.…”

mentioning

confidence: 97%

Tunable Sieving of Ions Using Graphene Oxide: Swelling Peculiarities in Free-Standing and Confined States

Eliseev,

Gurianov,

Poyarkov

et al. 2023

Nano Lett.

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The paper describes a comparative study of swelling processes in free-standing graphene oxide (GO) membranes and GO laminates encapsulated with epoxy glue. For free-standing graphene oxide membranes, a huge variation in d-spacing in the range of 8–12 Å depending on the ambient humidity and from 12 to >30 Å depending on the electrolyte type and its concentration was revealed using direct in situ and in operando XRD studies. Limited swelling at various humidity levels as well as in electrolyte solution with low constriction/expansion of epoxy-encapsulated GO is counterposed to that of free-standing graphene oxides. The swelling suppression was explained by both physical constriction and the intercalation of amines into GO laminates, which was proved by local EDX studies. This results in ion diffusivity variation for over 2 orders of magnitude in free-standing and constrained graphene oxide membranes and provides factual evidence for tunable sieving of ions with confined graphene oxides.

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“…Regardless of the specific structural configuration, the practical utilization of GO membranes in desalination applications requires addressing their inherent tendency to undergo swelling when exposed to aqueous environments. ,− In response, researchers have explored various methods, including external pressure regulation, cross-linking with small molecules, , and intercalation of cations ,,,− to arrest the swelling character of the GO membranes. Among these approaches, introducing cations into the membrane layers demonstrates the most promising developments in counteracting the swelling behavior and ensuring stable interlayer spacing.…”

Section: Introductionmentioning

confidence: 99%

Comparative Retention Analysis of Intercalated Cations Inside the Interlayer Gallery of Lamellar and Nonlamellar Graphene Oxide Membranes in Reverse Osmosis Process: A Molecular Dynamics Study

Reddy,

Anki Reddy,

Kumar

2024

J. Phys. Chem. B

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Over the past decade, multilayered graphene oxide (GO) membranes have emerged as promising candidates for desalination applications. Despite their potential, a comprehensive understanding of separation mechanisms remains elusive due to the intricate morphology and structural arrangement of interlayer galleries. Moreover, a critical concern of multilayered GO membranes is their susceptibility to swelling within aqueous environments, which hinders their practical implementation. Therefore, this study introduces cation intercalation within GO laminates to elucidate the underlying factors governing swelling behavior and subsequently mitigate it. Moreover, this study performed nonequilibrium molecular dynamics simulations on the cation (Mg 2+ or K + )intercalated lamellar and nonlamellar GO membranes to understand the effect of the arrangement of GO sheets on the retention time of intercalated cations within GO layers, water permeance, and salt rejection mechanism in the reverse osmosis process using cationintercalated GO membranes. Our results highlight that lamellar GO membranes exhibit higher water permeance, attributed to their well-defined interlayer gallery structure. On the other hand, nonlamellar GO membranes display superior salt rejection due to their complex interlayer gallery structure that impedes salt permeation. Moreover, the structural complexity of nonlamellar GO membranes contributes to greater stability by retention of the more intercalated cations for a longer time within the layers. Furthermore, it is observed that a higher percentage of Mg 2+ cations remained inside the GO laminates as compared to K + cations, hence resulting in the greater stability of the Mg 2+ -intercalated GO membrane in the aqueous environment.

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Pervaporation desalination with graphene oxide membranes: The influence of cation type and loading

Cited by 16 publications

References 42 publications

Composite 2D Material-Based Pervaporation Membranes for Liquid Separation: A Review

Composite 2D Material-Based Pervaporation Membranes for Liquid Separation: A Review

Tunable Sieving of Ions Using Graphene Oxide: Swelling Peculiarities in Free-Standing and Confined States

Comparative Retention Analysis of Intercalated Cations Inside the Interlayer Gallery of Lamellar and Nonlamellar Graphene Oxide Membranes in Reverse Osmosis Process: A Molecular Dynamics Study

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