Dual-layered nanocomposite substrate membrane based on polysulfone/graphene oxide for mitigating internal concentration polarization in forward osmosis

Lim, Sang-Hyun; Park, Myoung Jun; Phuntsho, Sherub; Tijing, Leonard D.; Nisola, Grace M.; Shim, Wang Geun; Chung, Wook–Jin; Shon, Ho Kyong

doi:10.1016/j.polymer.2016.12.066

Cited by 114 publications

(60 citation statements)

References 48 publications

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“…Assuming an osmotic process under the same conditions, it would only take ≈4 min for a freestanding CNM to dilute the DS from 1 to 0.3 m , while the HTI‐CA membrane would need ≈300 min (Figure b). Interestingly, during the osmotic transport, the solute concentration at the FS side only rises from 2 to 6 × 10 −3 m for TE PET supported CNM, from which we can extract a reverse flux selectivity (i.e., water flux/salt flux) of ≈0.6 m 3 mol −1 for freestanding CNMs, which is four times higher than the 0.15 m 3 mol −1 achieved by the HTI‐CA . TPT CNMs thus outperform currently used forward osmosis membranes with respect to water flow and ion rejection.…”

Section: Ion Transport Through a Single Channel At 1 M Kclmentioning

confidence: 69%

“…This is smaller than the value (≈800 L m −2 h −1 bar −1 ) determined from the earlier mass‐loss measurements, which is possibly due to the occurrence of internal and external concentration polarization caused by the thick support layer and the unstirred solution in the osmotic process. However, the permeance during osmosis is yet two orders of magnitude higher than for the best known commercial FO membranes (HTI‐CA) . Assuming an osmotic process under the same conditions, it would only take ≈4 min for a freestanding CNM to dilute the DS from 1 to 0.3 m , while the HTI‐CA membrane would need ≈300 min (Figure b).…”

Section: Ion Transport Through a Single Channel At 1 M Kclmentioning

confidence: 99%

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Ultrahigh Ionic Exclusion through Carbon Nanomembranes

Yang

Hillmann

et al. 2020

Advanced Materials

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The collective “single‐file” motion of water molecules through natural and artificial nanoconduits inspires the development of high‐performance membranes for water separation. However, a material that contains a large number of pores combining rapid water flow with superior ion rejection is still highly desirable. Here, a 1.2 nm thick carbon nanomembrane (CNM) made from cross‐linking of terphenylthiol (TPT) self‐assembled monolayers is reported to possess these properties. Utilizing their extremely high pore density of 1 sub‐nm channel nm−2, TPT CNMs let water molecules rapidly pass, while the translocation of ions, including protons, is efficiently hindered. Their membrane resistance reaches ≈104 Ω cm2 in 1 m Cl− solutions, comparable to lipid bilayers of a cell membrane. Consequently, a single CNM channel yields an ≈108 higher resistance than pores in lipid membrane channels and carbon nanotubes. The ultrahigh ionic exclusion by CNMs is likely dominated by a steric hindrance mechanism, coupled with electrostatic repulsion and entrance effects. The operation of TPT CNM membrane composites in forward osmosis is also demonstrated. These observations highlight the potential of utilizing CNMs for water purification and opens up a simple avenue to creating 2D membranes through molecular self‐assembly for highly selective and fast separations.

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Section: Ion Transport Through a Single Channel At 1 M Kclmentioning

confidence: 69%

Section: Ion Transport Through a Single Channel At 1 M Kclmentioning

confidence: 99%

Ultrahigh Ionic Exclusion through Carbon Nanomembranes

Yang

Hillmann

et al. 2020

Advanced Materials

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“…Results revealed that GO-DADMAC PSF membrane shows high rejection for heavy metals such as Cu 2+ and Cd 2+. Lim et al [170] prepared Dual-layered thin film composite polysulfone/graphene oxide membrane. Results revealed that prepared membrane showed high performance due to water permeability, high water flux, low contact angle and good hydrophilic character.…”

Section: Role Of Graphene Oxide In Polymer Nano-composite Membranesmentioning

confidence: 99%

A Comprehensive Review on Polymeric Nano-Composite Membranes for Water Treatment

Zahid¹,

Rashid²,

Akram³

et al. 2018

J Membr Sci Technol

190

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During last few decades, membrane technology has emerged as an efficient technique over conventional methods due to its high removal capacity, ease in operation and cost effectiveness for wastewater treatment and production of clean water. Membrane based separations are commonly based on polymeric membranes because of their higher flexibility, easily pore forming mechanism, low cost and smaller space for installation as compared to inorganic membranes. Commonly employed membrane fabrication phase inversion method has been shortly reviewed in this article. Major limitation of membrane based separations is fouling and polymeric membranes being hydrophobic in nature are more prone to fouling. Fouling is a deposition of various colloidal particles, macromolecules (polysaccharides, proteins), salts etc. on membrane surface and within pores thus impedes membrane performance, reduces flux and results in high cost. Modification of polymeric membranes due to its tailoring ability with nanomaterials such as metal based and carbon based results in polymeric nano-composite membranes with high antifouling characteristics. Nanomaterials impart high selectivity, permeability, hydrophilicity, thermal stability, mechanical strength, and antibacterial properties to polymeric membranes via blending, coating etc. modification methods. Characterization techniques has also discussed in later section for studying morphological properties and performance of polymer nano-composite membranes. Graphical Abstract

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“…The casted membrane composites showed enhanced water treatment properties due to the features of functionalized graphene and its positive effect on the pore structure. In particular, Lim et al fabricated a dual‐layer GO/PSf support layer by a double‐blade casting technique. Different concentrations of PSf were used for the top and bottom substrate layers.…”

Section: Preparation Of Functionalized Graphene–polymer Membranesmentioning

confidence: 99%

Graphene Oxide‐Based Polymeric Membranes for Water Treatment

Xiao

Zhao

Tian

et al. 2018

Adv Materials Inter

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their energy consumption is much lower than that of thermal approaches. [3] Therefore, membrane technologies are regarded as cost-effective candidates and play an increasingly important role in the treatment of natural waters and wastewaters. [4] Membrane processes for water purification and desalination can be generally classified into microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), reverse osmosis (RO), and emerging forward osmosis (FO) according to the pore size of the membrane and the respective rejection mechanism. The materials used to fabricate the membranes cover a wide range of polymers and inorganic materials. By far, polymeric membranes are the most widespread type due to their high processability, high flexibility, and low cost. [5][6][7] Traditional asymmetric membranes that contain only one type of polymer are mainly used for UF and a few NF applications. These membranes exhibit an asymmetric porous structure that consists of a thin nano porous active layer and a microporous underlying layer. MF membranes, however, possess a relatively symmetric micro porous structure. These porous membranes are mainly fabricated by phase inversion. For RO, FO, and most NF membranes that reject nanoscale solutes, an individual nonporous, dense, and thin polyamide (PA) active layer is normally required and is deposited onto a porous support layer to ensure a high selectivity. The active layer is prepared via interfacial polymerization (IP), while the support layer can be fabricated by phase inversion. These membranes are known as thin film composite (TFC) membranes, and the layers are comprised of different polymers. TFC membranes possess superior permeability over that of first-generation cellulose acetate membranes. [8,9] Although polymeric membranes have been widely reported in scientific studies and utilized for industrial applications, they are restricted by the inherent limitations of the material, such as a permeability/selectivity trade-off and a low fouling resistance. The current ability to control the membrane structure in both molecular-level design and fabrication process is not satisfactory. [10] In the last decade, the incorporation of nanomaterials into polymeric membranes has gained considerable attention owing to the potential of the resulting materials for overcoming the above limitations. [11,12] These advanced composite membranes have shown enhanced performance with a low loading of nanoparticles (NPs), including zeolites, [13][14][15] silica, [16][17][18][19][20][21][22] Membrane technologies for water treatment and desalination are increasingly developed and utilized to address the global challenges of water security and supply. Membrane-based separations can produce water with desirable qualities from a wide range of water sources, such as groundwater, seawater, brackish water, and wastewater. However, the membranes, which are typically made from polymers, are still restricted by their inherent limitations, including a permeability/selectivity trade-off and a high fouling prop...

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Dual-layered nanocomposite substrate membrane based on polysulfone/graphene oxide for mitigating internal concentration polarization in forward osmosis

Cited by 114 publications

References 48 publications

Ultrahigh Ionic Exclusion through Carbon Nanomembranes

Ultrahigh Ionic Exclusion through Carbon Nanomembranes

A Comprehensive Review on Polymeric Nano-Composite Membranes for Water Treatment

Graphene Oxide‐Based Polymeric Membranes for Water Treatment

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