Trivalent metal cation cross-linked graphene oxide membranes for NOM removal in water treatment

Liu, Ting; Yang, Bing; Graham, Nigel; Yu, Wenzheng; Sun, Kening

doi:10.1016/j.memsci.2017.07.061

Cited by 94 publications

(47 citation statements)

References 30 publications

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“…Prior to this finding, GO membranes cross‐linked by Fe 3+ and Al 3+ ions were prepared and applied for the removal of natural organic matter from raw water resources. [ 61 ] It was demonstrated that the trivalent metal cations greatly improved the binding strength between GO sheets, and thus enhanced the stability of GO membranes. Moreover, the interlayer spacing of GO membranes could be modified by the ion concentration.…”

Section: Cation–π Interactions In Graphene‐based Materials For Water mentioning

confidence: 99%

Cation–π Interactions in Graphene‐Containing Systems for Water Treatment and Beyond

2020

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was also recognized. [2] In addition to these forces, one intriguing noncovalent interaction: cation-π interaction, has emerged as an intermolecular force of great significance in chemistry, biology, and materials science. [3] The cation-π interactions basically refers to the interplay between cations and the π electron cloud of an aromatic system. It plays a great role in biological systems for molecular recognition, protein-protein interactions, and the maintenance of macromolecular structures. It also occurs in protein-ligand interactions and protein-DNA complexes. In structural biology, the positively charged amino acids interact with aromatic amino acids, which contribute to the formation of complex protein structures. The amide NHs are in close contact with the aromatic ring of another amino acid in the protein crystal structures. [4] The cation-π interactions are of great importance to protein stability. There is at least one intermolecular cation-π interaction in half of proteins and one third of homodimers, [5] making significant contributions to the tertiary and quaternary protein structures caused by protein folding. In addition, metallic cations, such as Na + , K + , Cu 2+ , Fe 2+ , Ca 2+ , exist in many enzymes. Their interactions with the π systems in protein structures cannot be ignored. In molecular neurobiology, many studies have proved that receptors bind the neurotransmitters through cation-π interactions. [6] The cation-π interaction is electrostatic in nature because the major contributions arise from the electrostatic attractions between cations and the quadrupole moment of the aromatics. [7] As a result, the strength of cation-π interactions can be the strongest among the noncovalent interactions, several times greater than others. It can also be regulated to be weak, depending on the type of cations and the nature of the π system. The adjustability of cation-π interaction offers a potential strategy to modify the neighboring environment where it is involved.Graphene, a 2D carbon network, with carbon atoms jointed together in a hexagonal honeycomb matrix, can be taken as a novel aromatic macromolecule from certain points of view. The unique structure endows it with excellent physicochemical, electronic, optical, thermal, and mechanical properties, leading to its potential applications in broad fields. [8] The interplay between cations and the delocalized polarizable π electrons of graphene, would alter the intrinsic characteristics of graphene-based structures and impart influences on the performance of graphene-based devices.Cation-π interactions are common in nature, especially in organisms. Their profound influences in chemistry, physics, and biology have been continuously investigated since they were discovered in 1981. However, the importance of cation-π interactions in materials science, regarding carbonaceous nanomaterials, has just been realized. The interplay between cations and delocalized polarizable π electrons of graphene would bring about significant changes to the intrinsic...

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Section: Cation–π Interactions In Graphene‐based Materials For Water mentioning

confidence: 99%

Cation–π Interactions in Graphene‐Containing Systems for Water Treatment and Beyond

2020

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“…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. While direct doping of cations in GO suspension to obtain interacting GO nanosheets will lead to flocculation and precipitates, the derived GO membrane either should be thick enough [48] to withstand the loose structure or was applied in rejection of larger-sized pollutants [49][50][51] (e.g., proteins). The separation of smallersized molecules remains challenging for these GO membrane configurations.…”

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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“…Besides the ligand, another requirement for the coordination reaction is the coordination center, which are usually metal ions that contain unoccupied orbitals. Various metal ions have been explored for the coordination‐driven assembly of graphene‐based hybrid nanostructures, including Ca 2+ , Mg 2+ , Cu 2+ , Zn 2+ , Co 2+ , Ni 2+ , Cd 2+ , Fe 2+ , Fe 3+ , Mn 2+ , Cr 2+ , Al 3+ , La 3+ , Bi 3+ , Y 3+ , Ag + , etc . During this assembly, metal ions can be either added from a foreign source (e.g., salts) or provided by another building block that already involves a coordination center.…”

Section: Coordination‐driven Assembly Based On Graphene and Its Derivmentioning

confidence: 99%

“…These divalent cations could coordinate not only with the oxygen‐containing functional groups on the basal planes of GO nanosheets, but also the carboxylic groups on the edges. Subsequently, various cations were used to modify the GO paper, including divalent and trivalent metal ions, and complex cations (e.g., ZrO 2+ and TiO 2+ ) . Due to the strong coordination interaction between GO nanosheets, the cation‐coordinated GO (GO‐M x + ) papers showed not only significantly reinforced mechanical properties (Figure b), but also impressively enhanced properties in thermal transfer, electrical conductivity, and stability (Figure c) .…”

Section: Coordination‐driven Assembly Based On Graphene and Its Derivmentioning

confidence: 99%

“…With this merit, the cation modified GO membranes could efficiently exclude other cations (even themselves, e.g., K + ), as shown in Figure f,g, which showed great potential in water desalination and purification. Also, such cation cross‐linked GO paper‐like membrane showed good capability to remove natural organic matters from raw water sources . Besides water treatment, this kind of membrane could be selectively permeable to various types of organic solvents, to which the neat GO membrane was impermeable …”

Section: Coordination‐driven Assembly Based On Graphene and Its Derivmentioning

confidence: 99%

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Coordination‐Driven Hierarchical Assembly of Hybrid Nanostructures Based on 2D Materials

Liu

Zhong

Xie

2019

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nanobelts), 2D materials exhibit exceptional physical properties including large theoretical surface area, tunable electronic properties, high optical transparency, and excellent mechanical properties. [2] However, the strong re-stacking tendency of 2D materials caused by van der Waals interaction may result in serious loss of surface area, which inevitably weakens their unique properties. Besides, 2D materials always show intrinsic deficiencies for specific applications, despite the merits mentioned above. As a typical example, TMDs possess high theoretical specific capacities for lithium-ion storage but exhibit unsatisfied cyclability and rate capability in practice, because of their aggregation, low conductivity as well as huge volume expansion during lithium-ion insertion/extraction. [3] One effective way to solve these problems is to construct hybrid nanostructures based on 2D materials. [4][5][6][7][8] Hybrid nanostructures, as a class of composite materials, are composed of two or more nanostructured building blocks. [9,10] Hybrid nanostructures not only can energetically combine the intriguing merits and overwhelm the deficiencies of each building block, but also may generate new functions and properties. [3][4][5][6][7][8][11][12][13] These advantages make hybrid nanostructures based on 2D materials highly promising for practical applications with high performance. [14][15][16][17][18] Regarding the multicomponent composition of hybrid nanostructures, the interfacial interaction between the building blocks lays the foundation for structural and morphological stability, thereby influencing the functions and properties of the resulting hybrid nanostructures. [19][20][21][22] In this sense, the rational design and construction of reliable interfacial interaction for hybrid nanostructures are not only important for achieving improved performance, but also critical for understanding the fundamentals of structureproperty relationship.Generally, there are five types of interfacial interactions, i.e., covalent bond, coordination bond, hydrogen bond, π-π interaction, and electrostatic interaction. [19][20][21][22] Covalent bond and coordination bond are much stronger than the other three in terms of bond energy, so the former two are more favorable for constructing hybrid nanostructures with reliable interfacial interaction. [19] However, most 2D materials are chemically inert, which means the covalent modification is not suitable for them. Alternatively, there are coordination atoms in most of 2D materials and their derivatives, and hence coordination 2D materials have received tremendous scientific and engineering interest due to their remarkable properties and broad-ranging applications such as energy storage and conversion, catalysis, biomedicine, electronics, and so forth. To further enhance their performance and endow them with new functions, 2D materials are proposed to hybridize with other nanostructured building blocks, resulting in hybrid nanostructures with various morphologies and structures. The prop...

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Trivalent metal cation cross-linked graphene oxide membranes for NOM removal in water treatment

Cited by 94 publications

References 30 publications

Cation–π Interactions in Graphene‐Containing Systems for Water Treatment and Beyond

Cation–π Interactions in Graphene‐Containing Systems for Water Treatment and Beyond

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

Coordination‐Driven Hierarchical Assembly of Hybrid Nanostructures Based on 2D Materials

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