Voltage-enhanced ion sieving and rejection of Pb2+ through a thermally cross-linked two-dimensional MXene membrane

Fan, Yiyi; Li, Jinyong; Wang, Saidi; Meng, Xiuxia; Zhang, Weimin; Jin, Yun; Yang, Naitao; Tan, Xiaoyao; Li, Jiaquan; Liu, Shaomin

doi:10.1016/j.cej.2020.126073

Cited by 53 publications

(16 citation statements)

References 42 publications

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“…A recent study reported a desirable rejection rate of Pb 2+ , up to 99%, as well as superior antiswelling. [ 57 ] Thermal cross‐linking was applied to effectively inhibit the swelling activity by drying the membrane at 70 °C to promote the cross‐linking process and engineer the interlayer spacing to 6.7–6.92 Å; moreover, an external voltage was introduced to facilitate the separation of noxious Pb 2+ (8.01 Å) from Pb 2+ /K + (6.62 Å) pairs. With the help of chemically cross‐linked sheets and external voltage, the separating factor reached 78 under an applied voltage of 16.5 V (Figure 7d).…”

Section: Applications In Separation Processesmentioning

confidence: 99%

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MXene‐Based Membranes for Separation Applications

2021

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MXenes are a new type of 2D material, featuring numerous favorable properties, such as excellent flexibility, hydrophilicity, abundant functional groups, and high conductivity. Currently, MXene is a hot topic in the field of membrane separation processes. This timely review presents the recent progress in MXene-based membrane in terms of structural engineering and versatile applications. First, the preparation methods for MXene nanosheets and the fabrication technologies for MXene-based membranes are categorized. Then, the separation-based applications of MXene membranes, including gas separation, water treatment, organic solvent purification, nanofluidic ion transport, and osmotic energy conversion, are summarized. Finally, the bottlenecks that limit the application of MXenebased membranes are outlined, and future research prospects are discussed.

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Section: Applications In Separation Processesmentioning

confidence: 99%

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confidence: 99%

MXene‐Based Membranes for Separation Applications

2021

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“…Additionally, Fan et al reported the fabrication of treated Ti 2 C 3 T x MXene membranes for efficient K + /Pb 2+ separation. [210] The excellent performance observed for thermally cross-linked Ti 2 C 3 T x MXene membranes under high voltage can be ascribed to the dehydration of OH groups. Generally, the voltagegated method has been emerged as an effective approach for enhancing ions rejection using electrostatic interactions between ions and negative surface charge of MXene membrane, as shown in Figure 17a.…”

Section: Ion Separation Of Mxene-based Membranesmentioning

confidence: 99%

“…The separation performance of mixed Pb 2+ /K + for Ti 2 C 3 T x MXene membrane: b) various membrane thicknesses under voltage of 16.5 V andc) various applied voltages. Reproduced with permission [210]. Copyright 2020, Elsevier.…”

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confidence: 99%

Ion‐Selective MXene‐Based Membranes: Current Status and Prospects

Mozafari

Shamsabadi

Rahimpour

et al. 2021

Adv Materials Technologies

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On the other hand, membrane separation has attracted attention, as an environmentally safe, simple, sustainable, and energy-efficient alternative separation technology. [4][5][6][7][8][9] Furthermore, compared to conventional separation processes, membrane separation has been found to be promising in water and wastewater treatment, [10,11] gas separation, [12][13][14] oil refinement, [15,16] food processing, [17] biology, [18][19][20] solid-phase extractions, [21,22] ion separation, [23] and pharmaceutical industries. [24] Ion-separation membranes have been widely used in various fields, such as electroplating, treatment of electronic waste, precious metal recovery, and metallurgical and battery industries. [25][26][27][28] The fabrication of highly-selective ion-separation membranes is still challenging in spite of many advances in the past few decades. [29,30] These membranes separate a targeted ion by isolating it from other ions. When ions that are present are of the same type and valence, [31,32] the separation is very difficult due to the similar permeabilities of the ions. Ion-separation membrane processes have been classified into nanofiltration (NF), [33] reverse osmosis (RO), [34,35] forward osmosis (FO), [36,37] electrodialysis, [38] and ion exchange membranes. [39] Among these, NF has exhibited good potential for selective separation of ions based on their charge and size, [40] allowing for the separation of ions with a specific diameter (larger than membrane nanochannels). [41] However, its solution flux decreases, as the size of its membrane nanochannels decreases. This relationship does not allow for achieving simultaneously high permeation and selectivity because of the inherent rejection/permeance tradeoff of the membranes. [42] Hence, the fabrication of ion-separation membranes with simultaneously high ion rejection and high permeation is of great interest. [40,43,44] To achieve simultaneously high ion rejection and high permeation, in recent years several materials have been investigated, including metal-organic frameworks (MOFs), [45][46][47] carbon nanotubes, [48] metal coated polymer, [49] metal nanotubes, [50] and porous carbon. [51] In particular, 2D materials have received attention [52] due to their quantum confinement effect and unique micro-structures [53] that contribute to their high separation performance. So far, phosphorene, layered double hydroxides, [54][55][56] transition metal dichalcogenides, [57][58][59][60][61][62] Water pollution is a major global challenge, as conventional polymeric membranes are not adequate for water treatment anymore. Among emerging materials for water treatment, composite membranes are promising, as they have simultaneously improved water permeation and ions rejection. Recently, a new family of 2D materials called MXenes has attracted considerable attention due to their appealing properties and wide applications. MXenes can be incorporated into many polymeric materials due to their high compatibility. MXenes/polymer composite membranes have been found...

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“…Therefore, many previous ERM studies have employed these carbonaceous nanomaterials for membrane separation ( Figure 1 c). In addition to these carbonaceous nanomaterials, more recently, 2D MXenes, molecular sheets with intrinsic good conductivity and superb capacitance made of metal carbides, transition nitrides, or carbonitrides, have also been evaluated for their feasibility as a building block for ERMs [ 26 , 36 ]. Interestingly, MXenes could also be made from different arrangements of transition metals such as molybdenum and titanium.…”

Section: Nanomaterials For Electro-responsive Membranesmentioning

confidence: 99%

Recent Progress in One- and Two-Dimensional Nanomaterial-Based Electro-Responsive Membranes: Versatile and Smart Applications from Fouling Mitigation to Tuning Mass Transport

et al. 2020

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Membrane technologies are playing an ever-important role in the field of water treatment since water reuse and desalination were put in place as alternative water resources to alleviate the global water crisis. Recently, membranes are becoming more versatile and powerful with upgraded electroconductive capabilities, owing to the development of novel materials (e.g., carbon nanotubes and graphene) with dual properties for assembling into membranes and exerting electrochemical activities. Novel nanomaterial-based electrically responsive membranes have been employed with promising results for mitigating membrane fouling, enhancing membrane separation performance and self-cleaning ability, controlling membrane wettability, etc. In this article, recent progress in novel-nanomaterial-based electrically responsive membranes for application in the field of water purification are provided. Thereafter, several critical drawbacks and future outlooks are discussed.

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Voltage-enhanced ion sieving and rejection of Pb2+ through a thermally cross-linked two-dimensional MXene membrane

Cited by 53 publications

References 42 publications

MXene‐Based Membranes for Separation Applications

MXene‐Based Membranes for Separation Applications

Ion‐Selective MXene‐Based Membranes: Current Status and Prospects

Recent Progress in One- and Two-Dimensional Nanomaterial-Based Electro-Responsive Membranes: Versatile and Smart Applications from Fouling Mitigation to Tuning Mass Transport

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