Ice-crystal templating approach for tailoring mass transfer channels in graphene oxide membranes for high-performance dye/salt separation

Zhang, Wen-Hai; Yin, Ming‐Jie; Jin, Chao; Liu, Zhijie; Wang, Naixin; An, Quan‐Fu

doi:10.1016/j.carbon.2021.06.077

Cited by 27 publications

(4 citation statements)

References 43 publications

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“…complete removal performance for negatively charged organic dyes with a molecular weight greater than 697, such as CR, MB, and RB (figure 4(c)), whereas MO with low molecular weight has a reduced rejection rate of 80.4% (figure S4). The GOM@70 °C shows a water permeance of 2.4 LMH/bar, with a slight decrease in water permeance in small-size dyes owing to their competing transportation with a water molecule (figure 4(c)) [26,27].…”

Section: Dye Separation Performance Of Go Membranesmentioning

confidence: 99%

“…In addition, the enhancement of ππ interaction after thermal treatment enables to tight the membrane (figure S5). The GO membrane's dye/salt separation performance was compared to that of existing GObased nanofiltration membranes (table 1) [27,39,40,[46][47][48][49][50][51][52][53]. Comparatively, the GO membrane shows the highest NaCl and MB rejections.…”

Section: Evaluation Of Long-term Continuous Operational Stabilitymentioning

confidence: 99%

“…Few research studies have been reported to tune the interlayer spacing of the GO membrane without the addition of nanomaterials. For example, Zhang et al prepared a GO membrane for nanofiltration by using an ice crystal templating method to tune the transport nanochannel [27]. In addition, Abraham et al synthesized a GO membrane with the physical confinement method and achieved accurate and tunable small ion sieving for up to 5 d [19].…”

Section: Introductionmentioning

confidence: 99%

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Highly stable graphene oxide/nylon membrane for molecular separation

2023

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Graphene oxide (GO), due to its one-atom-thick structure and enriched oxygenated functionalities, is a promising candidate material to develop nanofiltration membranes to tackle the current worldwide water shortage. However, the stability of the GO membrane in an aqueous environment and its long-term operation remains unresolved. These issues greatly affect the mass transfer in the GO membrane. Here, we fabricate an ultrathin GO membrane on a nylon substrate within 5 minutes with the help of vacuum filtration for molecular separation. Thus, GO/nylon membranes dried in an oven at temperatures of 70ºC have greater aqueous solution stability than those dried at room temperature. To validate the stability, both GO membranes were immersed in DI water for 20 days. As a result, the GO/nylon membrane dried at room temperature was completely detached from the substrate within 12 h, whereas the GO/nylon membrane that dried at 70°C remained stable for more than 20 days without any physical damage. We suppose the enhanced stability is due to the thermally induced balance in electrostatic repulsion resulting in stabilizing of the GO membrane. This method improves the GO membrane's operating time, selectivity, and permeability. Therefore, the optimized GO/nylon membrane shows higher rejection of organic dyes (~100%) and good selectivity for sulfate salts such as Na2SO4 and MgSO4 (>80%). The membrane continuously operates for more than 60 h with only a 30% water permeability decline and 100% rejection of dyes. We believe that the drying of GO/nylon membranes at a moderate temperature is important for enhanced separation performance and stability. This drying technique can be applied to other applications.

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Section: Dye Separation Performance Of Go Membranesmentioning

confidence: 99%

Section: Evaluation Of Long-term Continuous Operational Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly stable graphene oxide/nylon membrane for molecular separation

2023

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“…[25,26] In contrast, 2D membranes are usually fabricated by the simple vacuum assembly of 2D materials. [27,28] The current reported material system of 2D nanofluidic membrane mainly include graphene oxide (GO), [29] transition metal nitrides and/or carbides (MXene), [30] montmorillonite (MMT), [31] layered bimetallic hydroxides (LDH), [32] carbon nitride, [33] and covalent organic framework (COF) [34] (Figure 1). Although 2D materials such as GO and MXene are expensive, the cost of 2D clay materials such as MMT is extremely low.…”

Section: Introductionmentioning

confidence: 99%

Surface Charge Modification on 2D Nanofluidic Membrane for Regulating Ion Transport

Xie

Tang

Qin

et al. 2022

Adv Funct Materials

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2D nanofluidic membranes are capable of regulating ion transport toward various applications concerning energy and environment, which is primarily contributed by the excess charge on the interior surface of narrow nanoscale pores. However, there is still a lack of comprehensive summaries and discussions on the surface charge modification principles and strategies of 2D nanofluidic membranes, as well as the practical applications of charge‐modified 2D nanofluidic membranes for regulating ion transport. In this review, the surface charge modification principles and charge modification methods of 2D nanofluidic membranes are first introduced in detail, which is of great significance for improving the ion regulation capability of membranes and realizing the design of nanochannel materials. Next, recent advances in the two typical applications of concentration cells and water treatment based on charge‐modified 2D nanofluidic membranes are summarized. Finally, some challenges and prospects related to charge‐modified 2D nanofluidic membranes are discussed to indicate directions for future research in this field. It is anticipated that this review will provide valuable strategies for the development of high‐performance charge‐modified 2D nanofluidic membranes toward energy and environment applications.

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Constructing 2D ultrathin graphene oxide membranes with supramolecular-assembled nano-adhesives for enhancing water stability

Liu

et al. 2023

Nano Res.

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Ice-crystal templating approach for tailoring mass transfer channels in graphene oxide membranes for high-performance dye/salt separation

Cited by 27 publications

References 43 publications

Highly stable graphene oxide/nylon membrane for molecular separation

Highly stable graphene oxide/nylon membrane for molecular separation

Surface Charge Modification on 2D Nanofluidic Membrane for Regulating Ion Transport

Constructing 2D ultrathin graphene oxide membranes with supramolecular-assembled nano-adhesives for enhancing water stability

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