Robust reduced graphene oxide membranes with high water permeance enhanced by K+ modification

Yang, Rujie; Fan, Ye; Yu, Risheng; Dai, Fangfang; Lan, Jian; Wang, Zhikun; Chen, Junlang; Chen, Liang

doi:10.1016/j.memsci.2021.119437

Cited by 33 publications

(19 citation statements)

References 55 publications

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“…As shown in Figure 1a, the thickness of the membrane prepared with 40 mL of 33.0 mg/L AH-rGO suspensions was ≈600 nm in the dry state. It clearly shows a defect-free surface and uniform thickness, which helps to improve water flux and the ions rejection rate [25,33,34]. The average static contact angle of the AH-rGO membrane surface was 57.8 • (see Figure S2a), indicating that the membrane has good hydrophilicity and thus contributes to water permeance [35].…”

Section: Characterizations Of the Ah-rgomentioning

confidence: 97%

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Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment

Xia

Zhou

et al. 2021

Membranes

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Membrane methods exhibit great potential for application in radioactive liquid waste treatment. In this work, we prepared a reduced graphene oxide using the amino-hydrothermal method (AH-rGO) that exhibited effective rejection rates of 99.9% for CoCl2, ZnCl2, NiCl2, and radionuclide 60Co solutions with an ultrahigh water permeance of >71.9 L m−2 h−1 bar−1. The thickness of the AH-rGO membranes affects the water permeance, as the membrane with a thickness of ≈250 nm has the highest water permeance of up to 125.1 L m−2 h−1 bar−1 with the corresponding rejection rate of 86.8%. Importantly, this is the most permeable membrane with a satisfactory level of the rejection rate for typical radioactive ions of Co2+, Zn2+, and Ni2+. Moreover, the AH-rGO membranes presented excellent stability. These findings demonstrate the potential of reduced graphene oxide (rGO) membranes for radioactive liquid waste treatment.

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Section: Characterizations Of the Ah-rgomentioning

confidence: 97%

“…The AH-rGO suspensions were prepared by the amino-hydrothermal method [27,32,33]. Graphite powders were concentrated in H 2 SO 4 containing K 2 S 2 O 8 and P 2 O 5 and stirred continuously for several hours.…”

Section: Preparation Of Ah-rgo Suspensionmentioning

confidence: 99%

Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment

Xia

Zhou

et al. 2021

Membranes

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“…Unfortunately, water permeation through the stacked GO membranes is insufficient due to strong capillary forces and narrow nanochannels. Widening the interlayer spacing has been used to modulate permeation in rGO films, and can comprise cationic crosslinking [103], carbon nanotube intercalation [104], polymer additives [105], etc. Zhang et al [106] demonstrated a versatile and facile method to synthesize ultrafine metal oxide/rGO nanocomposites through a heterogeneous nucleation and growth process for nanofiltration applications (Figure 7a).…”

Section: Rgo Membranementioning

confidence: 99%

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

Zhang

Zheng

Yu³

et al. 2022

Nanomaterials

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Membrane-based nanotechnology possesses high separation efficiency, low economic and energy consumption, continuous operation modes and environmental benefits, and has been utilized in various separation fields. Two-dimensional nanomaterials (2DNMs) with unique atomic thickness have rapidly emerged as ideal building blocks to develop high-performance separation membranes. By rationally tailoring and precisely controlling the nanochannels and/or nanoporous apertures of 2DNMs, 2DNM-based membranes are capable of exhibiting unprecedentedly high permeation and selectivity properties. In this review, the latest breakthroughs in using 2DNM-based membranes as nanosheets and laminar membranes are summarized, including their fabrication, structure design, transport behavior, separation mechanisms, and applications in liquid separations. Examples of advanced 2D material (graphene family, 2D TMDs, MXenes, metal–organic frameworks, and covalent organic framework nanosheets) membrane designs with remarkably perm-selective properties are highlighted. Additionally, the development of strategies used to functionalize membranes with 2DNMs are discussed. Finally, current technical challenges and emerging research directions of advancing 2DNM membranes for liquid separation are shared.

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“…Compared with GO, the intensity of K-GO decreases, proving the cation-π interaction between K + and GO. 50 Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize the morphologies of GO and K-rGO. Figure 2a and b show the SEM images of GO and K-rGO.…”

Section: Synthesis and Characterization Of K-rgo Nanosheetsmentioning

confidence: 99%

Cation–π interaction assisted facile preparation of graphene/epoxy nanocomposites with superior strength and toughness

Huang

Yan

et al. 2022

J of Applied Polymer Sci

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High‐performance graphene/epoxy nanocomposites are desired in many fields. However, the performance of graphene/epoxy nanocomposites is far from the actual demand, and many methods reported for the preparation of graphene/epoxy nanocomposites need the participation of environmentally harmful organic solvents. Herein, a novel, facile, and green cation–π interaction assisted phase transfer approach is developed for construction of graphene/epoxy nanocomposites. This strategy includes constructing potassium ion modified reduce graphene oxide (K‐rGO) as nanofiller and choosing 1‐(oxiran‐2‐ylmethyl)‐1H‐indole (IN) as phase transfer agent. The cation–π interaction is formed between K‐rGO and indole group, which not only facilitates the transfer of K‐rGO from water phase to organic phase, but also enhances the dispersion of K‐rGO in epoxy. When the loading of K‐rGO is 0.10 wt%, the tensile strength and elongation at break of epoxy nanocomposites increase by 116.6% and 126.5%, respectively, compared to neat epoxy. The simultaneous improvement in tensile strength and extensibility of graphene/epoxy nanocomposites is achieved. Furthermore, the prepared epoxy nanocomposites exhibit an excellent thermal conductivity owing to the good dispersion of K‐rGO in epoxy matrix.

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Robust reduced graphene oxide membranes with high water permeance enhanced by K+ modification

Cited by 33 publications

References 55 publications

Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment

Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

Cation–π interaction assisted facile preparation of graphene/epoxy nanocomposites with superior strength and toughness

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