Water and ion sorption, diffusion, and transport in graphene oxide membranes revisited

Cho, Yong-Hoon; Kim, Hyo Won; Lee, Hee Dae; Shin, Jae Eun; Yoo, Byung Min; Park, Ho Bum

doi:10.1016/j.memsci.2017.09.043

Cited by 99 publications

(74 citation statements)

References 51 publications

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“…Using cations to stabilize GO films for mechanical enhancement was substantiated as early as 2008 [43]. Recent studies have reported the cationic interactions with GO to acquire universal coating layer [44], to obtain selective permeation of cations [10,45,46] or to reinforce the stability of the laminar structure [47]. As cations introduced in the interlayer of GO laminates possess different interactions (such as cation-π and coordination) with GO in sp 2 and sp 3 areas, neighboring GO nanosheets become cohesive, and hence the stability as well as the performance of the bulk GO membrane is improved.…”

Section: Introductionmentioning

confidence: 99%

Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

et al. 2019

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Structural manipulation of graphene oxide (GO) building blocks has been widely researched. Concerning GO membranes for separation applications, the validity and maintenance of their microscopic structures in the chemical environment are pivotal for effective separation at the molecular scale. Cationic interactions with both aromatic rings and oxygenated functional groups of GO make metal ions intriguing for physically and chemically structural reinforcement. By filtrating GO suspension through the substrate loaded with cations, stacking of GO nanosheets and diffusion of cations steadily evolve simultaneously in an aqueous environment without flocculation. Thus, thin and homogeneous GO membrane is obtained. Divalent and monovalent cations were studied regarding their interactions with GO, and the performance of correspondingly functionalized membranes was evaluated. The divalent cation-stabilized membranes have favorable stability in the separation of water/ethanol. This facile fabrication and functionalization method may also be applicable for structure construction of other two-dimensional materials.

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Section: Introductionmentioning

confidence: 99%

Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

et al. 2019

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“…The interlayer spacings of GO-K, GO-Ca, and GO-Fe were greater than that of GO-120. This is because the cations in the GO layers increased the distance between GO layers [14,17,38]. GO-Fe had the largest d-spacing, which is because Fe 3+ has the largest hydrated ionic radius among K + , Ca 2+ , and Fe 3+ .…”

Section: Metal Ion Insertion Into the Go-120 Membranementioning

confidence: 99%

“…GO is negatively charged (see Figure S2) and thus repels anions through Donnan repulsion. The GO-120 membrane strongly rejected sulfate because of its high valence state [14,30], which resulted in the low permeation of sulfate. The low permeability of nitrate arose from the same concentration of nitrate anion in the permeate and feed tanks.…”

Section: Metal Ion Permeation Through the Gomsmentioning

confidence: 99%

“…GO-Fe had the largest d-spacing, which is because Fe 3+ has the largest hydrated ionic radius among K + , Ca 2+ , and Fe 3+ . Cho et al [14] studied the insertion of alkali metal ions into GO layers and found that the GO layer spacing increased with the hydrated ionic radius of the ions inserted in the GO layers. Yu and colleagues proposed that there is a strong interaction between the hydrated metal ions and GO and the hydrated ions strongly adsorb on the aromatic rings of GO, which controls the spacing between GO layers [38].…”

Section: Metal Ion Insertion Into the Go-120 Membranementioning

confidence: 99%

“…There are many ways to prepare GO, and the C/O ratio of GO is affected by the preparation method. The C/O ratio will increase (oxygen content will decrease) when the GO retention time is extended or the GO solution is heated, which gives partially reduced graphene oxide (rGO) [14]. GO can be reduced by ultraviolet irradiation [15] or by exposure to hydroiodic acid steam [16].…”

Section: Introductionmentioning

confidence: 99%

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Ion Transport Behavior through Thermally Reduced Graphene Oxide Membrane for Precise Ion Separation

Huang

Miao

et al. 2019

Crystals

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The cation transport behavior of thermally treated reduced graphene oxide membranes (GOMs) is reported. The GOMs were reduced by heat treatment at 25, 80, and 120 °C and then characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy to determine oxygen group content, C/O ratio, and layer spacing. The permeation rates of various cations with different sizes and charge numbers through these membranes were measured to understand the effect of the cations on transport behavior. The results indicated that the cation transport through the membranes depended on the layer spacing of the membrane and ion size and charge. Cations of the same valence permeating through the same GOM could be differentiated by their hydration radius, whereas the same type of cation passing through different GOMs could be determined by the spacing of the GOM layers. The cation valence strongly affected permeation behavior. The GOM that was prepared at 120 °C exhibited a narrow layer spacing and high separation factors for Mg/Ca, Mg/Sr, K/Ca, and K/Fe. The cations moving through the membrane could insert into the membrane lamellas, which neutralized the negative charge of the membrane, enlarged the layer spacing of the GOMs, and affected cation permeation.

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Transport Mechanism of 2 D Membranes

Lee¹,

Park²

2022

Two‐Dimensional‐Materials‐Based Membranes

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Water and ion sorption, diffusion, and transport in graphene oxide membranes revisited

Cited by 99 publications

References 51 publications

Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

Ion Transport Behavior through Thermally Reduced Graphene Oxide Membrane for Precise Ion Separation

Transport Mechanism of 2 D Membranes

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