High-performance multi-functional reverse osmosis membranes obtained by carbon nanotube·polyamide nanocomposite

Inukai, Shigeki; Cruz-Silva, Rodolfo; Ortiz‐Medina, Josué; Morelos-Gómez, Aarón; Takeuchi, Kenji; Hayashi, T.; Tanioka, Akihiko; Araki, Takumi; Tejima, Syogo; Noguchi, Tōru; Terrones, Mauricio; Endo, Morinobu

doi:10.1038/srep13562

Cited by 115 publications

(65 citation statements)

References 39 publications

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“…To extend the applications of GO‐based membranes, for example, to ultrafiltration (UF) and microfiltration (MF), and further improve GO‐based membrane performance, various inorganic materials, such as carbon nanotubes (CNTs), TiO 2 , Ag and other nanoparticles have been hybridized with GO to improve their water purification performance. In addition, GO has been investigated as a novel additive to various polymers to form MMM with improved water purification performance …”

Section: Go Composite Membranes and MMM With Go Additivementioning

confidence: 99%

“…Recently, adding nanoparticles in this layer creates a new type of high performance membrane for water desalination . In GO‐TFC MMM preparation, GO flakes were blended into polymer matrix during interfacial polymerization reaction to improve the physical properties of the host polymers . By directly involving GO flakes into interfacial polymerization, Bano et al reported the fabrication of novel polyamide (PA)‐GO MMM.…”

Section: Go Composite Membranes and MMM With Go Additivementioning

confidence: 99%

See 1 more Smart Citation

Graphene Oxide: A Novel 2‐Dimensional Material in Membrane Separation for Water Purification

Fathizadeh

Zhou

et al. 2017

Adv Materials Inter

176

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a significant advantage, greatly facilitates GO deposition from solution using water as a low cost and environment-friendly solvent. [3] Recently, GO has attracted great attention as a novel 2-D membrane material in water purification application because of its excellent mechanical property, atomically thin thickness, excellent dispersion in water, and ease to form compact membrane structure or to be added into polymer matrix. [3,4] Concept demonstration/preliminary studies on using graphene-based membranes for water purification were focused on simulations for single layer graphene/ GO/reduced GO (rGO) with structural defects. Cohen-Tanugi et al., [5] using molecular dynamics (MD) simulation, found that hydrogenated and hydroxylated defects with appropriate sizes on graphene could have 2-3 orders of magnitude higher water permeability than commercial reverse osmosis (RO) membranes but similarly high salt rejection, suggesting great potential of single-layered graphene membranes for desalination. Lin et al. [6] showed by MD simulations that thermally reducing GO with different initial epoxy to hydroxyl ratios and different oxygen concentrations may generate selective defects on rGO for high water permeability and high salt rejection desalination. Figure 2a shows representative structures of rGO after reduction at 2,500 K, when GO flakes with different starting oxygen concentrations and epoxy concentrations or epoxy/hydroxyl ratios are used. With the increase of oxygen concentration and epoxy concentration, rGO becomes more defective and has bigger nanopores because of more carbon removal from the GO matrix. This suggests pores on rGO may be controlled by controlling starting GO composition and reduction conditions. Further, they studied desalination performance of defects on rGO after reduction at different temperatures and using GO with different oxygen concentrations and epoxy concentrations (Figure 2b). Too low oxygen concentration (17%) leads to complete water blocking irrespective of reduction temperature and initial epoxy concentration or epoxy/hydroxyl ratio. At higher initial oxygen concentration (25% and 33%), high water flux and 99% salt rejection can be obtained depending on reduction temperature epoxy/hydroxyl ratio. These promising simulation results, therefore, suggest appropriately reducing GO with desired starting composition As a newly emerging 2-dimensional (2-D) material with sub-nanometer thickness, graphene oxide (GO) has been widely studied either as a pure/skeleton membrane material or as an additive in and a functional coating on matrix membranes for water purification because of its unique physico-chemicomechanical properties. Manipulating or incorporating this novel 2-D material effectively into a membrane structure has been shown to significantly improve membrane performance, including increased water permeability, alleviated fouling, improved antibacterial properties, etc., which will eventually lead to lower energy consumption, longer lifetime, and lower maintenance cost. As the pure/...

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Section: Go Composite Membranes and MMM With Go Additivementioning

confidence: 99%

Section: Go Composite Membranes and MMM With Go Additivementioning

confidence: 99%

Graphene Oxide: A Novel 2‐Dimensional Material in Membrane Separation for Water Purification

Fathizadeh

Zhou

et al. 2017

Adv Materials Inter

176

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“…The figure shows that the addition of 0.08 and 0.1 wt% MWCNTs provided a more chemically stable membrane as it became more Chlorine resistant. The improvement of Chlorine resistance upon incorporation of MWCNTs is due to the physical crosslinking effect of MWCNT that enhances the mechanical strength of the membrane, as well as reduces the degradation of the polymer by reducing the sites where Chlorine atoms could be attached to [114,115].…”

Section: Effect Of Mwcnts Infusion On Pva Membranes Separation Performentioning

confidence: 99%

Highly improved reverse osmosis performance of novel PVA/DGEBA cross-linked membranes by incorporation of Pluronic F-127 and MWCNTs for water desalination

2016

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“…To address this issue, we fabricated PBI‐based nanocomposite membranes by incorporating CNTs into PBI matrix. In the present work, instead of the interfacial polymerization, which is commonly used for polyamide‐based RO membranes, the composite membranes were fabricated by spin‐coating from the PBI solutions containing CNTs. The thickness of the prepared free‐standing membranes was controlled to be around 4 μm.…”

Section: Introductionmentioning

confidence: 99%

Enhancing water flux through semipermeable polybenzimidazole membranes by adding surfactant‐treated CNTs

Zhang

Davaajargal

Aiba

et al. 2017

J of Applied Polymer Sci

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In this study, surfactant‐treated carbon nanotubes (CNTs) were incorporated into polybenzimidazole (PBI) matrix to prepare the PBI/CNT composite membranes with CNT content in the range of 0 to 15 wt %. The composite membranes were fabricated by spin‐coating. The membrane morphology, mechanical property, and water and salt transport properties were investigated to characterize the additive effect of CNTs. The tensile strength of all the PBI/CNT composite membranes was lower than that of pristine PBI membrane, indicating the weak interaction between CNT and PBI. In addition, water flux increased without reducing the salt rejection when CNTs were homogeneously dispersed in the PBI matrix at a less than 7.5 wt % content. On the other hand, at 10 wt % and higher CNT content, submicro‐scaled cellular structure was formed, and both the water flux and salt rejection decreased. The well‐dispersed CNTs in the PBI matrix via weak interaction preferentially improve the water permeability by 1.7 times without depressing the salt rejection. The incorporation of well‐dispersed CNTs in polymer matrix provides a promising and facile option for improvement in the water transport properties through the polymeric semipermeable membranes with intrinsically low water permeability such as PBI. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45875.

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High-performance multi-functional reverse osmosis membranes obtained by carbon nanotube·polyamide nanocomposite

Cited by 115 publications

References 39 publications

Graphene Oxide: A Novel 2‐Dimensional Material in Membrane Separation for Water Purification

Graphene Oxide: A Novel 2‐Dimensional Material in Membrane Separation for Water Purification

Highly improved reverse osmosis performance of novel PVA/DGEBA cross-linked membranes by incorporation of Pluronic F-127 and MWCNTs for water desalination

Enhancing water flux through semipermeable polybenzimidazole membranes by adding surfactant‐treated CNTs

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