Shielding membrane surface carboxyl groups by covalent-binding graphene oxide to improve anti-fouling property and the simultaneous promotion of flux

Han, Jinglong; Xia, Xue; Yu, Tao; Yun, Hui; Hou, Yanan; Zhao, Changwei; Luo, Quan; Cheng, Hao-Yi; Wang, Aijie

doi:10.1016/j.watres.2016.06.032

Cited by 64 publications

(27 citation statements)

References 60 publications

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“…Although the surface energy is higher (lower contact angle) compared to the PTFE membrane, the permeable graphene film exhibits a negligible surface charge (remains charge neutral) compared to the negatively charged PTFE membrane. Charge neutrality generally helps improve the membrane’s antifouling properties, and is likely to be the case in this work 38 , 39 .…”

Section: Discussionmentioning

confidence: 82%

Anti-fouling graphene-based membranes for effective water desalination

et al. 2018

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The inability of membranes to handle a wide spectrum of pollutants is an important unsolved problem for water treatment. Here we demonstrate water desalination via a membrane distillation process using a graphene membrane where water permeation is enabled by nanochannels of multilayer, mismatched, partially overlapping graphene grains. Graphene films derived from renewable oil exhibit significantly superior retention of water vapour flux and salt rejection rates, and a superior antifouling capability under a mixture of saline water containing contaminants such as oils and surfactants, compared to commercial distillation membranes. Moreover, real-world applicability of our membrane is demonstrated by processing sea water from Sydney Harbour over 72 h with macroscale membrane size of 4 cm2, processing ~0.5 L per day. Numerical simulations show that the channels between the mismatched grains serve as an effective water permeation route. Our research will pave the way for large-scale graphene-based antifouling membranes for diverse water treatment applications.

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Section: Discussionmentioning

confidence: 82%

Anti-fouling graphene-based membranes for effective water desalination

et al. 2018

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“…Also, Cu(NO 3 ) 2 and ethanol amine have been used to form stable nano-strand-channelled GO ultrafiltration membranes, comprising a network of nano-channels after the ethanol amine was washed away by N 2 H 4 (Huang et al 2013). Very recently, it has been shown that GO nanosheets could be modified/connected by solvent green (8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium salt) through the strong π-π stacking interactions (Shen et al 2017) or by ethylenediamine (Han et al 2016).…”

Section: W Yu Et Almentioning

confidence: 99%

Development of a stable cation modified graphene oxide membrane for water treatment

Graham

2017

2D Mater.

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Membranes prepared from layers of graphene oxide (GO) offer substantial advantages over conventional materials for water treatment (e.g. greater flux), but the stability of GO membranes in water has not been achieved until now. In this study the behavior of GO membranes prepared with different quantities and species of cations has been investigated to establish the feasibility of their application in water treatment. A range of cation-modified GO membranes were prepared and exposed to aqueous solutions containing specific chemical constituents. In pure water, unmodified and Na-modified GO membranes were highly unstable, while GO membranes modified with multivalent cations were stable provided there were sufficient quantities of cations present; their relative capability to achieve GO stability was as follows: Al 3+ > Ca 2+ > Mg 2+ > Na + . It is believed that the mechanism of cross-linking, and membrane stability, is via metal-carboxylate chelates and cation-graphite surface interactions (cation-π interaction), and that the latter appears to increase with increasing cation valency. The instability of cation (Ca or Al)-modified GO membranes by NaCl solutions during permeation occurred as Na + exchanged with the incorporated multivalent cations, but a high content of Al 3+ in the GO membrane impeded Al 3+ /Na + exchange and thus retained membrane stability. In solutions containing biopolymers representative of surface waters or seawater (protein and polysaccharide solutions), Ca-GO membranes (even with high Ca 2+ content) were not stable, while Al-GO membranes were stable if the Al 3+ content was sufficiently high; Al-formed membranes also had a greater flux than Ca-GO membranes. PAPEROriginal content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.

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“…Applying an electric capacitive carbon material (e.g., activated carbon) as the supporting layer of the UF membrane could also increase the electrostatic repulsion when negatively charged (Liang et al, 2019). The membrane-foulant covalent complexation could be alleviated by reducing the density of carboxyl groups on the membrane surface (Mo et al, 2012;Han et al, 2016). The spatial effects could be regulated by changing the pore morphology (Xiao et al, 2014a;Fan et al, 2018), surface roughness (Hashino et al, 2011;Feng et al, 2017), and surface topography of the membrane (e.g., prism/pyramid/embossing-patterned membranes Won et al, 2016 and hierarchically textured membranes Zhao et al, 2018).…”

Section: Membrane Modification For Tuning the Membrane-foulant Interamentioning

confidence: 99%

Outlining the Roles of Membrane-Foulant and Foulant-Foulant Interactions in Organic Fouling During Microfiltration and Ultrafiltration: A Mini-Review

Xiao

Wang

et al. 2020

Front. Chem.

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Membrane fouling remains a notorious problem in microfiltration (MF) and ultrafiltration (UF), and a systematic understanding of the fouling mechanisms is fundamental for solving this problem. Given a wide assortment of fouling studies in the literature, it is essential that the numerous pieces of information on this topic could be clearly compiled. In this review, we outline the roles of membrane-foulant and foulant-foulant intermolecular interactions in MF/UF organic fouling. The membrane-foulant interactions govern the initial pore blocking and adsorption stage, whereas the foulant-foulant interactions prevail in the subsequent build-up of a surface foulant layer (e.g., a gel layer). We classify the interactions into non-covalent interactions (e.g., hydrophobic and electrostatic interactions), covalent interactions (e.g., metal-organic complexation), and spatial effects (related to pore structure, surface morphology, and foulants size for instance). They have either short-or long-range influences on the transportation and immobilization of the foulant toward the membrane. Specifically, we profile the individual impacts and interplay between the different interactions along the fouling stages. Finally, anti-fouling strategies are discussed for a targeted control of the membrane-foulant and foulant-foulant interactions.

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Shielding membrane surface carboxyl groups by covalent-binding graphene oxide to improve anti-fouling property and the simultaneous promotion of flux

Cited by 64 publications

References 60 publications

Anti-fouling graphene-based membranes for effective water desalination

Anti-fouling graphene-based membranes for effective water desalination

Development of a stable cation modified graphene oxide membrane for water treatment

Outlining the Roles of Membrane-Foulant and Foulant-Foulant Interactions in Organic Fouling During Microfiltration and Ultrafiltration: A Mini-Review

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