A composite membrane of cross-linked GO network semi-interpenetrating in polysulfone substrate for dye removal from water

Zhang, Ning; Qi, Wenxu; Huang, Lili; Jiang, En; Li, Zhiying; Luo, Yang; Zhang, Xiaopeng; Bao, Junjiang; Zheng, Wenji; He, Gaohong

doi:10.1016/j.memsci.2020.118456

Cited by 36 publications

(4 citation statements)

References 46 publications

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“…Negatively charged GO membranes have been reported to show superior dye removal performance for positively charged cationic dyes due to the electrostatic interactions. − However, the rejection of anionic dyes was not favorable because of the electrostatic repulsion. In view of this, we performed dye rejection experiments at pH 2, 7, and 12 to verify that the pH-responsive gating properties of p-nGOMs were due to not only electrostatic effects caused by the protonation of amine groups but also the tunable confined nanochannels caused by the configuration transition of PEI chains.…”

Section: Resultsmentioning

confidence: 95%

Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

et al. 2021

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Tunable gating graphene oxide (GO) membranes with high water permeance and precise molecular separation remain highly desired in smart nanofiltration devices. Herein, bioinspired by the filtration function of the renal glomerulus, we report a smart and high-performance graphene oxide membrane constructed via introducing positively charged polyethylenimine-grafted GO (GO-PEI) to negatively charged GO nanosheets. It was found that the additional GO-PEI component changed the surface charge, improved the hydrophilicity, and enlarged the nanochannels. The glomerulus-inspired graphene oxide membrane (G-GOM) shows a water permeance up to 88.57 L m–2 h–1 bar–1, corresponding to a 4 times enhancement compared with that of a conventional GO membrane due to the enlarged confined nanochannels. Meanwhile, owing to the electrostatic interaction, it can selectively remove positively charged methylene blue at pH 12 and negatively charged methyl orange at pH 2, with a removal rate of over 96%. The high and cyclic water permeance and highly selective organic removal performance can be attributed to the synergic effect of controlled nanochannel size and tunable electrostatic interaction in responding to the environmental pH. This strategy provides insight into designing pH-responsive gating membranes with tunable selectivity, representing a great advancement in smart nanofiltration with a wide range of applications.

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Section: Resultsmentioning

confidence: 95%

Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

et al. 2021

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“…In processes used for liquid separation, laminated GO membranes typically swell, and their layer spacing widens due to capillary pumping of liquids and solutions, which makes the membranes less repulsive to salts and small solutes and also leads to poor stability of the GO membranes . The deprotonation of the carboxyl group on GO in an aqueous solution makes the GO flakes negatively charged, causing electrostatic repulsion to occur between adjacent GO flakes and making GO less stable in aqueous solution and limiting its application in practical processes. − Recent studies have shown that cross-linkers are effective in linking GO layers and enhancing the stability of the membrane (Figure a). ,, Up to now, to achieve high cross-linking, a large number of micromolecules including amines (Figure b), − urea, amino acids, fullerenes, thioureas, and glutaric dialdehydes have been used as cross-linking agents to react with the hydroxyl, carboxyl, and epoxy groups on the surface of the GO sheets. Moreover, during the cross-linking reaction, the oxygen-containing sites on the GO flakes are replaced or dominated by other groups, which reduces the force between the water molecules and the GO .…”

Section: Modification Of Go Membranesmentioning

confidence: 99%

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Yang

Xiao

Shen

et al. 2022

ACS Appl. Nano Mater.

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Advanced membrane separation technology plays an important role in achieving excellent water treatment, which can help solve the freshwater crisis. However, there remains a trade-off between membrane permeability and selectivity. An emerging candidate to address this issue is graphene oxide (GO), a two-dimensional (2D) laminated graphene derivative with abundant oxygen functional groups. Furthermore, the transport channels of GO-based membranes can be artificially modified and manipulated, exhibiting great promise for GO in the field of water purification and molecular separation. This review comprehensively summarizes the research advances on 2D GO-based membranes for high-performance nanofiltration (NF). It begins with an elaboration on the preparation methods of GO-based membranes, followed by a detailed summary of the chemical modification and physical manipulation of transport channels. Then we reviewed the current research progress of theoretical calculation and molecular dynamics simulation. Also, the high NF performance of GO-based membranes is presented. Finally, the remaining challenges and future prospects in order to develop advances in membrane technology are provided.

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“…Polycrystalline Metal-organic framework (MOF) membranes have shown promising application in efficient gas and liquid separation due to their tailorable framework structure, [1][2] high surface areas, [3] and rich functionality. [4] To date, hundreds of different types of MOF membranes have been fabricated and demonstrated attractive performances in gas separation (such as H 2 purification, [5] CO 2 capture [6] and olefin separation [7] ) and in liquid separation (such as dye rejection, [8][9][10][11][12][13][14][15][16][17][18][19][20] ion screening, [21] and pervaporation). [22][23][24] In terms of water treatment, MOFpolymer composite membranes have been widely studied for ion screening and dye rejection.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Defect‐Engineered MOF‐801 Membrane for Efficient Dye Rejection

Yan

Sun

et al. 2023

Eur J Inorg Chem

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Although having shown great promise for efficient water treatment, rational structural design and engineering of polycrystalline MOF membranes remain rarely investigated so far. In this study, we prepared well-intergrown MOF-801 membranes with tailorable structural deficiencies in the framework for application in dye rejection. Of particular note, we found that the addition of formic acid as modulator led to the formation of MOF-801 membrane with higher missing-linker number, which was beneficial for increasing water flux with little compromise in dye rejection rate. The MOF-801 membrane prepared in this work exhibited excellent dye rejection performance (CR rejection rate of 99.50 % and water flux of 31.69 L m À 2 h À 1 bar À 1 ) as well as excellent long-term stability.

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A composite membrane of cross-linked GO network semi-interpenetrating in polysulfone substrate for dye removal from water

Cited by 36 publications

References 46 publications

Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Fabrication of Defect‐Engineered MOF‐801 Membrane for Efficient Dye Rejection

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