Polyvinylidene fluoride phase design by two-dimensional boron nitride enables enhanced performance and stability for seawater desalination

Lee, Dongju; Woo, Yun Chul; Park, Kwang Hyun; Phuntsho, Sherub; Tijing, Leonard D.; Yao, Minwei; Shim, Wang Geun; Shon, Ho Kyong

doi:10.1016/j.memsci.2019.117669

Cited by 18 publications

(7 citation statements)

References 49 publications

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“…Tuning of the architecture of hydrogel membranes was used to improve engineered osmosis [ 33 ]. Boron nitride nanosheets in polyvinylidene fluoride-co-hexafluoropropene membranes were incorporated for improved desalination performance [ 34 ], and aliphatic polyketone membranes were doped with alginate additive to accelerate or inhibit solvent-nonsolvent exchange rate and improve the hydrophilicity of the membranes [ 35 ]. It was also shown that the structural (surface heterogeneity) and material characteristics (yield stress) influence hydraulic resistance during filtration through polyethersulfone membranes [ 36 ].…”

Section: Discussion Of the Role Of Water Droplets In The Ise Membrane Resistancementioning

confidence: 99%

The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range

2021

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The dependence of the bulk resistance of membranes of ionophore-based ion-selective electrodes (ISEs) on the composition of mixed electrolyte solutions, within the range of the Nernstian potentiometric response, is studied by chronopotentiometric and impedance measurements. In parallel to the resistance, water uptake by the membranes is also studied gravimetrically. The similarity of the respective curves is registered and explained in terms of heterogeneity of the membranes due to the presence of dispersed aqueous phase (water droplets). It is concluded that the electrochemical equilibrium is established between aqueous solution and the continuous organic phase, while the resistance refers to the membrane as whole, and water droplets hamper the charge transfer across the membranes. In this way, it is explained why the membrane bulk resistance is not constant within the range of the Nernstian potentiometric response of ISEs.

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Section: Discussion Of the Role Of Water Droplets In The Ise Membrane Resistancementioning

confidence: 99%

The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range

2021

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“…Composite membranes based on PVDF-hexafluoropropylene (PVDF-HFP) modified by incorporating boron nitride nanosheets, graphene, carbon nanotubes, and other nanoparticles showed increased membrane hydrophobicity and liquid entry pressure (LEP), thereby decreasing the membrane wettability while maintaining the pore size large enough to get high porosity, high flux, and salt rejection (>99%) [54][55][56][57]. Omniphobic membranes were developed to decrease the wettability of the membrane caused due to feed solution composition, as these membranes are both hydrophobic and oleophobic, which resist lowsurface tension liquids [58,59].…”

Section: Applications Of Nanofibers For Water Treatmentmentioning

confidence: 99%

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

et al. 2021

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In the past few decades, the role of nanotechnology has expanded into environmental remediation applications. In this regard, nanofibers have been reported for various applications in water treatment and air filtration. Nanofibers are fibers of polymeric origin with diameters in the nanometer to submicron range. Electrospinning has been the most widely used method to synthesize nanofibers with tunable properties such as high specific surface area, uniform pore size, and controlled hydrophobicity. These properties of nanofibers make them highly sought after as adsorbents, photocatalysts, electrode materials, and membranes. In this review article, a basic description of the electrospinning process is presented. Subsequently, the role of different operating parameters in the electrospinning process and precursor polymeric solution is reviewed with respect to their influence on nanofiber properties. Three key areas of nanofiber application for water treatment (desalination, heavy-metal removal, and contaminant of emerging concern (CEC) remediation) are explored. The latest research in these areas is critically reviewed. Nanofibers have shown promising results in the case of membrane distillation, reverse osmosis, and forward osmosis applications. For heavy-metal removal, nanofibers have been able to remove trace heavy metals due to the convenient incorporation of specific functional groups that show a high affinity for the target heavy metals. In the case of CECs, nanofibers have been utilized not only as adsorbents but also as materials to localize and immobilize the trace contaminants, making further degradation by photocatalytic and electrochemical processes more efficient. The key issues with nanofiber application in water treatment include the lack of studies that explore the role of the background water matrix in impacting the contaminant removal performance, regeneration, and recyclability of nanofibers. Furthermore, the end-of-life disposal of nanofibers needs to be explored. The availability of more such studies will facilitate the adoption of nanofibers for water treatment applications.

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“…On the basis of this theory, an investigation reported by Lee and colleagues indicates the great capability of prepared PVDF- co -hexafluoropropylene (PVDF- co -HFP) for the air gap membrane distillation (AGMD) process with excellent long-term durability for 280 h as well as better vapor flux. The membrane fabrication condition for electrospinning was carried out at 10 kV, 15 cm, and 1 mL/h as voltage, distance, and feed flow rate, respectively …”

Section: Fabrication Techniques Of Bn-based Membranesmentioning

confidence: 99%

A Comprehensive Review on the Applications of Boron Nitride Nanomaterials in Membrane Fabrication and Modification

Vatanpour

Mehrabani

Keskin

et al. 2021

Ind. Eng. Chem. Res.

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Boron nitride (BN) presented enormous potential in the fabrication of novel membranes with superior separation efficiency. Researchers try to produce membranes with high solvent permeability and good rejection performance in industrial applications. In this review, the recent progress in the fabrication of BN-based membranes with different fabrication techniques and various applications is reviewed. Representative studies on applying BN-based membranes in gas separation, proton exchange, electrodialysis, and water filtration membranes to develop their performance and stability, induce antifouling characteristics, and decline the trade-off between selectivity and permeability, together with the explanation of their mechanisms, are discussed. Moreover, various methods of synthesis of BN allotropes are introduced. In addition, a brief review of simulation studies (molecular dynamic and density function theory) on theoretical studies of BN nanosheet membranes was performed. The authors hope that this review will arouse the active interest of many researchers in the further development of the BNs application in membrane science and technology.

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Polyvinylidene fluoride phase design by two-dimensional boron nitride enables enhanced performance and stability for seawater desalination

Cited by 18 publications

References 49 publications

The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range

The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

A Comprehensive Review on the Applications of Boron Nitride Nanomaterials in Membrane Fabrication and Modification

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