Anti-fouling and high water permeable forward osmosis membrane fabricated via layer by layer assembly of chitosan/graphene oxide

Salehi, Hasan; Rastgar, Masoud; Shakeri, Alireza

doi:10.1016/j.apsusc.2017.03.271

Cited by 136 publications

(44 citation statements)

References 63 publications

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“…A similar approach of depositing AGO/GO layers on PES was also reported . Salehi et al fabricated a novel FO membrane by means of LBL assembly of positively charged chitosan and negatively charged GO on a sulfonated PES (SPES)/PES support layer via electrostatic attraction. The membrane showed an improved fouling resistance to sodium alginate (SA).…”

Section: Preparation Of Functionalized Graphene–polymer Membranesmentioning

confidence: 93%

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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Section: Preparation Of Functionalized Graphene–polymer Membranesmentioning

confidence: 93%

Graphene Oxide‐Based Polymeric Membranes for Water Treatment

Xiao

Zhao

Tian

et al. 2018

Adv Materials Inter

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“…where Δ m is the weigh change of the draw solution in a predetermined time (Δ t ) during the test, S m is the effective membrane area (m 2 ), and ρ is the water density (0.998 g/cm 3 ) .…”

Section: Methodsmentioning

confidence: 99%

Effects of organic acids on the performance of cellulose triacetate forward osmosis membrane

Kong

Zheng

Chen

et al. 2018

Polymer Engineering & Sci

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Forward osmosis (FO) membrane performance was improved using different organic acids (formic acid, acetic acid, lactic acid) for the addition of the casting solution. Scanning electron microscope (SEM) images of all the FO CTA membranes exhibited essentially the membranes have a structure of looking like two dense skin layers and a sponge‐like supporting layer. Additionally, based on the surface roughness values analysis of Atomic Force Microscope (AFM), the membranes with lactic acid, with similar roughness to the membranes without any acid, have bigger roughness than the membranes with formic acid or acetic acid. Furthermore, the water flux of membranes with acids has been improved and the reverse salt flux decreased. The membranes with lactic acid, with an outstanding penetration performance, were utilized to test the performance when 1 mol/L sodium chloride (NaCl), magnesium chloride (MgCl2), magnesium sulfate (MgSO4), and sodium sulfate (Na2SO4) were, respectively, as the draw solutions. The results revealed that the membranes have a higher rejection ratio for MgSO4. Besides, in the process of separating oil–water mixture, the membranes with the organic acids have a better separation efficiency than the membrane without any acid during FO process and the water flux recovery rate could achieve above 90% insuring the membrane anti‐fouling. POLYM. ENG. SCI., 59:E138–E145, 2019. © 2018 Society of Plastics Engineers

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“…Commonly, a desirable FO membrane requires (1) an ultrathin highly selective layer, (2) a highly porous and hydrophilic support layer for water transfer and low internal concentration polarization (ICP) and (3) excellent antifouling properties. [19][20][21][22][23] However, the low water ux and membrane fouling are still two key problems in FO. 18,[24][25][26][27][28] Water molecules have to pass through the active layer, thus the thickness and hydrophilicity changes in membranes can make water transport faster by reducing the mass transfer resistance.…”

Section: Introductionmentioning

confidence: 99%