Interplay of graphene oxide and interfacial polymerized polyamide-crosslinked thin-film composite membranes for enhanced performance during reverse osmosis

Gupta, Sanju; Evans, Brendan

doi:10.5004/dwt.2021.26967

Cited by 9 publications

(4 citation statements)

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“…Semi-hydrophilic membranes have a contact angle of less than 90 • , and as the angle drops, they become more effective at preventing fouling and influencing membrane flow [26,55]. The contact angle measures how a liquid behaves when it comes into contact with a membrane surface.…”

Section: Contact Angle Of Membranesmentioning

confidence: 99%

Preparation, Characterization and Evaluation of Polyamide-Reduced Graphene Oxide as Selective Membranes for Water Purification

Alshahrani,

El-Habeeb,

Almutairi

et al. 2024

J. Compos. Sci.

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Amidst the ongoing advancements in membrane technology, a leading method has come to the forefront. Recent research has emphasized the substantial influence of surface attributes in augmenting the effectiveness of thin-film membranes in water treatments. These studies reveal how surface properties play a crucial role in optimizing the performance of these membranes, further establishing their prominence in the field of membrane technology. This recognition stems from the precise engineering of surfaces, ensuring they meet the demanding requirements of advanced separation processes. This study utilizes polyamide as a discerning layer, applied atop a polysulfone support sheet through interfacial polymerization (IP) for membrane fabrication. The amounts in the various membranes were created to vary. The membrane’s permeability to water with significant salt rejection was enhanced, which improved its effectiveness. The polyamide (PA) membrane comprising graphene oxide (rGO, 0.015%) had a water permeability of 48.90 L/m2 h at 22 bar, which was much higher than the mean permeability of polyamide membranes (25.0 L/m2 h at 22 bar). On the other hand, the PA–rGO/CHIT membranes exhibited the lowest water permeability due to their decreased surface roughness. However, the membranes’ effectiveness in rejecting salts ranged from 80% to 95% for PA–rGO and PA–rGO/CHIT membranes.

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Section: Contact Angle Of Membranesmentioning

confidence: 99%

Preparation, Characterization and Evaluation of Polyamide-Reduced Graphene Oxide as Selective Membranes for Water Purification

Alshahrani,

El-Habeeb,

Almutairi

et al. 2024

J. Compos. Sci.

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“…For instance, GO composite membranes functionalized by interfacial polymerization exhibit substantial chlorine resistance and bactericidal properties. 18 A self-assembly of GO sheets with an asymmetric residue distribution yields to both oxidized and nonoxidized regions in a single channel, 19 which satisfies the requirement of frictionless water flow and high ion repulsion. Janus membranes containing functional composites provide prominent performance in wastewater treatment and desalination due to opposite surface wettability 20,21 and exhibit high salt concentration tolerance.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the edge gap, the restriction of ion transport primarily occurs in the interlayer, and therefore the properties of the internal surface have a profound influence on the selectivity of channels. , Significantly, the adjustment of the interfacial and chemical properties enhances the applicability of membranes. For instance, GO composite membranes functionalized by interfacial polymerization exhibit substantial chlorine resistance and bactericidal properties . A self-assembly of GO sheets with an asymmetric residue distribution yields to both oxidized and nonoxidized regions in a single channel, which satisfies the requirement of frictionless water flow and high ion repulsion.…”

Section: Introductionmentioning

confidence: 99%

Desalination Performance in Janus Graphene Oxide Channels: Geometric Asymmetry vs Charge Polarity

Li,

Zhang,

2024

ACS Appl. Mater. Interfaces

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Improving the desalination performance of membranes is always in the spotlight of scientific research; however, Janus channels with polarized surface charge as nanofiltration membranes are still unexplored. In this work, using molecular dynamics simulations, we demonstrate that Janus graphene oxide (GO) channels with appropriate geometry and surface charge can serve as highly efficient nanofiltration membranes. We observe that the water permeability of symmetric Janus GO channels is significantly superior to that of asymmetric channels without sacrificing much ion rejection, owing to weakened ion blockage and electrostatic effects. Furthermore, in symmetric Janus GO channels, the transport of water and ions is sensitive to the charge polarity of the channel inner surface, which is realized by tuning the ratio of cationic and anionic functionalization. Specifically, with the increase in cationic functionalization, the water flux decreases monotonously, while ion rejection displays an interesting maximum behavior that indicates desalination optimization. Moreover, the trade-off between water permeability and ion rejection suggests that the Janus GO channels have an excellent desalination potential and are highly tunable according to the specific water treatment requirements. Our work sheds light on the key role of channel geometry and charge polarity in the desalination performance of Janus GO channels, which paves the way for the design of novel desalination devices.

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“…RO is a pressuredriven process where unwanted impurities is forced through a semi-permeable membrane, selectively transporting monovalent ions (Na + , K + , Cl − ) and water molecules while rejecting 2 multivalent ions, dissolved organic compounds and micro-organisms (e.g., bacteria) [3,14,15,16]. The membranes used are based on conventional thin film polymer (polyamide; PA, cellulose acetate; CA, polysulfone; PS), polymeric composites, and ceramics that have salient advantages such as good separation capability, structural stability (mechanical robustness), anti-biofouling, and wide pH tolerance [17,18,19]. Membranes that recognize and selectively transport specific molecular and ionic species are being actively pursued to meet the needs in food processing, treatment of wastewater, brackish water, chemical, biomedical, and pharmaceutical industries.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired and Biomimetic Membranes Using Ion Channel Pro-teins and Designer Peptides Conjugated With Graphene Oxide for Selective Ion Transport

Gupta¹,

Robinson²,

Evans³

2023

Preprint

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Recent advances in synthetic membranes allow their use in fields as diverse as food and agriculture, biotechnology, industrial wastewater treatment, and potable water production. Among the newly developed technologies, nanofiltration for liquids and more particularly for desalination of seawater or saline aquifers are actively pursued. However, current solid-state membranes performance is limited, which calls for the development of novel formulations for membranes offering both high permeability (ion and water flux) and ion differentiation (selectivity), usually considered antagonist features. We report the development of hybrid nanoporous membranes made of solid-state polymeric carbonate track-etched (PCTE) thin films in which biological ion channels such as Gramicidin A (GA), alpha-hemolysin (α-HL), and outer-membrane protein F (OmpF) aquaporin are confined and graphene oxide (GO) conjugated cobalt ion selective binding peptide motifs (Copep) are adsorbed, referring as bioinspired and biomimetic approaches, respectively. These solid-state nanoporous membranes are attracting widespread attention since they offer scalability, mechanical robustness, selectivity, controlled pore dimension and shape, for water sustainability. The ion permeability, ion diffusion coefficient and selective ion recognition are evaluated via nanofiltration, cell diffusion kinetics, and UV-Visible absorption spectroscopy to gain insights into the role of key performance parameters including effective ion confinement in track-etched pores, rich surface chemistry, and peptide-induced channel for selective ion transport. These findings provide new avenues for artificial ion channels by synergistic combination of eco-friendly material design such as GO enabled by bio-molecular recognition chemistry.

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Interplay of graphene oxide and interfacial polymerized polyamide-crosslinked thin-film composite membranes for enhanced performance during reverse osmosis

Cited by 9 publications

References 0 publications

Preparation, Characterization and Evaluation of Polyamide-Reduced Graphene Oxide as Selective Membranes for Water Purification

Preparation, Characterization and Evaluation of Polyamide-Reduced Graphene Oxide as Selective Membranes for Water Purification

Desalination Performance in Janus Graphene Oxide Channels: Geometric Asymmetry vs Charge Polarity

Bioinspired and Biomimetic Membranes Using Ion Channel Pro-teins and Designer Peptides Conjugated With Graphene Oxide for Selective Ion Transport

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