Laminated GO membranes for water transport and ions selectivity: Mechanism, synthesis, stabilization, and applications

Xing, Yulei; Xu, Guiyin; An, Zi-Han; Liu, Yan‐Hui; Xu, Ke; Liu, Qian; Zhao, Honglin; Das, Rasel

doi:10.1016/j.seppur.2020.118192

Cited by 24 publications

(6 citation statements)

References 172 publications

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“…Evidence for the holey structure of GO flakes in GO membranes was provided in several studies . However, the question of the presence/absence of holes and a related permeation pathway remains highly controversial. − Many recent studies of GO membrane permeation continue to cite GO flakes as hole-free impermeable barriers for the permeation of water and other solvents − in the absence of direct microscopic confirmation of hole-dependent permeation.…”

Section: Introductionmentioning

confidence: 99%

Rapid Aging of Bilayer Graphene Oxide

et al. 2022

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Atomic force microscopy (AFM) imaging was used to study swelling of individual bilayer graphene oxide (GO) flakes in water and ethanol vapors. We found that within 5 days after sample deposition the swelling of bilayered Hummers GO (HGO) in ethanol vapors disappears nearly completely, whereas the swelling in water remains not affected. Swelling can therefore be used as a sensitive indicator of rapid aging of bilayered HGO, which occurs both in air and under inert gas. The surprising ability of 5-days-aged bilayered HGO to swell in water but not in ethanol fits to the effects observed in μm-thick GO membranes after several years of aging. Remarkably, bilayered Brodie GO (BGO) maintains swelling in ethanol after storing it under the same conditions as HGO. Moreover, we demonstrate that AFM can be used to detect hole defects in individual GO sheets. The BGO bilayer swelling in ethanol vapors starts either on the flake edges or in very few points, forming ∼2 Å height fronts, which propagate slowly within interlayer spaces in all directions. The increase of the average distance between HGO sheets occurs simultaneously all over the flake, demonstrating a high abundance of hole defects. Our results imply that the permeation path length in HGO membranes must be significantly shorter compared to BGO, which is important to take into account in the modeling of membrane permeation.

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Section: Introductionmentioning

confidence: 99%

Rapid Aging of Bilayer Graphene Oxide

et al. 2022

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“…We attribute the improved purity to the two factors. First, the negative electrostatic forces from rGO nanosheets can induce the Donnan effect, which creates electrostatic repulsion toward negatively charged ions but attract positively charged ions. , The main cations in the simulated seawater (i.e., Li + , Na + , K + , Mg 2+ , and Ca 2+ ) can be attracted to the rGO coatings, resulting in the preferable adsorption of cations on electrode surfaces. , According to the coating method used for rGO nanosheets, the PDDA coating was first applied on LMO particles to create a positively charged surface, so that rGO nanosheets could be attached evenly. The PDDA was only introduced as an agent to facilitate the coating of rGO nanosheets.…”

Section: Resultsmentioning

confidence: 99%

“…Second, stacked rGO nanosheets form tortuous paths that restrict larger ions’ passing (i.e., Na + , K + , Mg 2+ , and Ca 2+ ). Previous studies of rGO membranes for desalination showed that the salt rejection (e.g., NaCl and MgCl 2 ) could be attributed to the Donnan effect and size exclusion. ,, During the recovery step, the interference of K + is negligible for the Li purity, because K + is intercalated into the NiHCF electrode. Na + has a high concentration (i.e., 3 M) in the simulated seawater, which is the main interfering ion due to its surface adsorption and cointercalation into LMO electrodes.…”

Section: Resultsmentioning

confidence: 99%

Lithium Manganate Wrapped with Ion-Selective Graphene Coatings for Thermally Assisted Lithium Extraction from Simulated Seawater

Yu,

Lai

et al. 2023

Energy Fuels

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Lithium (Li) is a critical element for various energy storage devices. Extracting Li from the ocean by electrochemical ion pumping using lithium manganate (LMO) could solve the potential Li shortages. In particular, a thermally assisted electrochemical Li + extraction process using low-grade heat can speed up extraction and reduce energy consumption. However, LMO suffers from fast extraction capacity fading and insufficient selectivity for Li + over Na + . Here, we show that the performance of LMO can be significantly improved by wrapping LMO with ion-selective reduced graphene oxide (rGO) coatings. The rGO coatings were assembled uniformly and controllably on LMO particles via a poly(diallyldimethylammonium) chloride interfacial binder. At the optimum mass ratio of 0.125 wt %, the rGO-coated LMO demonstrates a higher capacity retention of 75.1% than uncoated LMO over 50 charge/discharge cycles. When paired with a nickel hexacyanoferrate electrode for Li + extraction from simulated seawater with a high Na + /Li + molar ratio of 20 000 at 60 °C, rGO-coated LMO shows much less capacity loss of 23.13% and yields a higher Li purity of 65.49% than uncoated LMO. The improved performance can be attributed to the Donnan effect of rGO nanosheets in attracting cations from low Li concentration simulated seawater on electrode surfaces and the size exclusion effect by restricting the mass transfer of large ions. Less cointercalation of competing Na + helps to ease the Jahn−Teller effect of LMO, resulting in enhanced crystalline structure stability. The thermally assisted Li extraction process has the potential to be further improved with innovative electrode material designs for practical applications.

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“…GOMs with ultrafast water transport nanochannels have attracted great attention in the field of membrane separation. However, it was worth noting that the wide application of GOMs in membrane technology is still facing several challenges, such as poor membrane stability in aqueous environments and precise regulation of the interlayer spacing of GOMs [ 111 , 112 ]. This review described the mass transfer mechanism of the structure of GO and the preparation methods of GOMs in brief.…”

Section: Discussionmentioning

confidence: 99%

GO-Based Membranes for Desalination

Huo

Gao

et al. 2023

Membranes

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Graphene oxide (GO), owing to its atomic thickness and tunable physicochemical properties, exhibits fascinating properties in membrane separation fields, especially in water treatment applications (due to unimpeded permeation of water through graphene-based membranes). Particularly, GO-based membranes used for desalination via pervaporation or nanofiltration have been widely investigated with respect to membrane design and preparation. However, the precise construction of transport pathways, facile fabrication of large-area GO-based membranes (GOMs), and robust stability in desalination applications are the main challenges restricting the industrial application of GOMs. This review summarizes the challenges and recent research and development of GOMs with respect to preparation methods, the regulation of GOM mass transfer pathways, desalination performance, and mass transport mechanisms. The review aims to provide an overview of the precise regulation methods of the horizontal and longitudinal mass transfer channels of GOMs, including GO reduction, interlayer cross-linking, intercalation with cations, polymers, or inorganic particles, etc., to clarify the relationship between the microstructure and desalination performance, which may provide some new insight regarding the structural design of high-performance GOMs. Based on the above analysis, the future and development of GOMs are proposed.

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Laminated GO membranes for water transport and ions selectivity: Mechanism, synthesis, stabilization, and applications

Cited by 24 publications

References 172 publications

Rapid Aging of Bilayer Graphene Oxide

Rapid Aging of Bilayer Graphene Oxide

Lithium Manganate Wrapped with Ion-Selective Graphene Coatings for Thermally Assisted Lithium Extraction from Simulated Seawater

GO-Based Membranes for Desalination

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