A novel approach for stable anion exchange membrane: Self-assembled multilayer formation on the membrane via LbL method

Arı, Gülşen Albayrak; Özcan, Zehra

doi:10.1016/j.synthmet.2016.06.022

Cited by 18 publications

(13 citation statements)

References 19 publications

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“…Based on the obtained results, it could be concluded that a supported membrane with a thin selective layer based on a polymer blend of PVA-PAH deposited on a porous PAN substrate and modified with 10 PEL bilayers via LbL deposition (PVA-PAH/LbL-10 PAN membrane) exhibited highly selective properties with respect to water (≥99 wt % water in the permeate) at different temperatures (20,30,45, 60 • C). Moreover, this membrane also had a permeation flux~4.5-fold higher than that of the commercial analog PERVAP TM 1201 (Sulzer) with the same selectivity level for the pervaporation dehydration of i-PrOH (20 wt % water) at 60 • C. This developed membrane is promising for industrial application in the dehydration of organic solvents.…”

Section: Discussionmentioning

confidence: 84%

“…Transport properties were studied using a pervaporation laboratory cell in steady-state regime at different temperatures (20,30,45, 60 • C) [38]. The composition of permeate and feed was analyzed by gas chromatography using a SHIMADZU GC-2010 chromatograph (SHIMADZU, Nancy, France) equipped with an HP-PLOT/U column (Agilent J&W GC Columns, Nancy, France) and a thermal conductivity detector.…”

Section: Pervaporation Experimentsmentioning

confidence: 99%

“…For investigation of the industrial application of a supported PVA-based membrane modified by 4.7 wt % PAH and 10 bilayers of PEL (PVA-PAH/LbL-10 PAN ) with the best transport properties for pervaporation isopropanol dehydration, it was decided to estimate the stability of this membrane for the separation of an isopropanol-water (20 wt % water) mixture at different temperatures (20,30,45, 60 • C), since most industrial processes were carried out at elevated temperatures. The transport properties of the PVA/LbL-10 PAN and PVA-PAH/LbL-10 PAN membranes are presented in Figure 10.…”

Section: Investigation Of Pan-supported Pva and Pva-pah Membranes At mentioning

confidence: 99%

“…It is one of the common simple ways for modifying polymer membranes due to the formation of denser, thicker, and smoother PEL multilayers [25]. The LbL modification by PEL of PVA polymer is applied in different fields of science and technology [29][30][31]. In Reference [29], a novel high-flux membrane for forward osmosis (FO) was prepared via LbL deposition of three PEL bilayers (chitosan (CS)/polyacrylic acid (PAAc)) on the developed membrane substrate based on a nanocomposite of polyvinyl alcohol (PVA) and montmorillonite clay.…”

mentioning

confidence: 99%

“…It was shown that the application of LbL surface modification of the prepared substrate allowed the achievement of low salt leakage. LbL coating of different bilayer numbers (5, 10, 20) of poly (diallyldimethylammonium chloride)/polystyrene sulfonic acid sodium salt) was also applied for the development of stable anion exchange KOH-doped PVA membranes cross-linked with glutaraldehyde (GA) or poly(ethylene glycol) diglycidyl ether (PEDGE) [30]. It was determined that the ionic conductivity of the membranes increased with the increase in the number of bilayers, and the multilayered film was stable against fuel cell operating conditions in terms of pH.…”

mentioning

confidence: 99%

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Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

et al. 2019

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In this work, dense and supported pervaporation polyvinyl alcohol (PVA)-based membranes modified with poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate)(PSS)/PAH top nanolayers were synthesized. Two main points were investigated: the role of the polyelectrolyte PAH on water selectivity of the selective polymer matrix and the impact of the porous substrate based on polyacrylonitrile (PAN) and aromatic polysulfone amide (UPM-20 ® ), used to get supported high-performance membranes. Various methods of analysis (fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), small-angle X-ray scattering (SAXS), porosity, contact angles, ultrafiltration) were applied to study the developed membranes. Transport characteristics of the developed membranes were studied in isopropanol dehydration by pervaporation. Obtained results are discussed in the light of the structure and physicochemical characteristics of these PVA/PAH membranes and the types of porous substrate. It was shown that the PAN-supported membrane with the selective layer based on PVA/PAH modified by 10 polyelectrolyte PSS/PAH bilayers possessed~4.5 times higher permeation flux with the same high selectivity level (99.9 wt % water in the permeate) for the dehydration of the isopropanol (20 wt % water) at 60 • C compared to the commercial analog PERVAP TM 1201.Polymers 2020, 12, 14 2 of 22 repellents, etc. Yet, for industrial application, the solvent must usually be anhydrous. In addition, this alcohol forms an azeotropic mixture with water (12 wt % water-88 wt % isopropanol) [8], which considerably hinders its dehydration via simple traditional methods of separation that entail a non-environmentally friendly process (addition of a third harmful organic reagent) and a high energy consumption (high temperature or low pressure, expensive equipment). Pervaporation is a promising and perspective technology for this task. Different types of pervaporation membranes (polymeric, inorganic, and composite) were developed for the dehydration of isopropanol [9][10][11][12]. Polymeric membranes find wider applications and are attractive because of the simplicity of their fabrication and lower price compared to inorganic membranes. The most popular polymer materials for dehydration are green water-soluble polymers, such as polyvinyl alcohol (PVA), chitosan (CS), cellulose, and sodium alginate [1,13,14], because these polymers possess high selectivity to water. However, the use of membranes based on these polymer materials requires additional cross-linking that, as a rule, leads to the decrease of permeation flux [12]. To improve the transport characteristics, additional bulk and surface modification methods can to be successfully applied, as previously shown [15][16][17][18][19][20].In this study, the selected material is polyvinyl alcohol, which is widely used for dehydration purposes due to its high water selectivity, good film-forming properties, and economic accessibility [1,4,21,22]. However, p...

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Section: Discussionmentioning

confidence: 84%

Section: Pervaporation Experimentsmentioning

confidence: 99%

Section: Investigation Of Pan-supported Pva and Pva-pah Membranes At mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

et al. 2019

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Pore Size Distribution and Blend Composition Affect In Vitro Prevascularized Bone Matrix Formation on Poly(Vinyl Alcohol)/Gelatin Sponges

Ossa

Trombi

D’Alessandro

et al. 2017

Macro Materials & Eng

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This study aims at identifying compositional and architectural (pore size and distribution) parameters of biocompatible scaffolds, which can be best suitable for both osteoblasts and endothelial cells to produce optimized 3D cocultured constructs. Spongy scaffolds are prepared using poly(vinyl alcohol) (PVA) and gelatin (G) at different weight compositions (PVA/G range: 100/0â\u80\u9350/50, w/w) via emulsion and freeze-drying. The higher the gelatin content, the larger is the volume occupied by higher size pores. Human umbilical vein endothelial cells and human mesenchymal stromal cells are independently differentiated on the scaffolds to select the best candidate for the coculture. The results of metabolic activity and histology on single platforms show both cell- and material-type dependent outcomes. PVA/G 80/20 scaffolds are finally selected and allow the formation of mineralized matrix containing organized endothelial-like structures. This study highlights the need for systematic investigations on multifactorial parameters of scaffolds to improve vascularized bone substitutes

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Preparation of proton block and highly conductive AEM by creating PANI dominated and hydrophobicity ion channels for sulfuric acid enrichment

Xie

Ning

et al. 2021

Polymers for Advanced Techs

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Electrodialysis is widely used to separate and concentrate sulfuric acid from industrial wastewater. Nevertheless, owing to the proton leakage of anion‐exchange membrane (AEM), the concentration of recycled sulfuric acid is typically less than 20 wt.%. What is more, the restraining of proton leakage would sacrifice the conductivity of membrane, leading to the increasing of energy consumption (EC). In this work, a proton block and highly conductive polyaniline (PANI)/polyvinylidene fluoride (PVDF) membrane were prepared by creating PANI dominated and hydrophobicity ion channels through etching. The variations of solubility, structure, and electrical performance of membrane during etching process were investigated. As a result, the electrical performance of membrane, especially for the conductivity, was significantly improved owning to the formation of PANI dominated ion channels and spaces. Meanwhile, even the porosity and water content of etched membrane were improved, the anions were mainly migrated through molecular chains of PANI; the protons were still blocked by the hydrophobic pores. Further, the etched membranes with different porosities were used to enrich sulfuric acid (1 wt.%) through electrodialysis. As a result, the proton leakage was proved to be the major limitative factor of acid solution enrichment. By using the optimal etched membrane, concentrated acid (41 wt.%) was obtained with a less energy consume (EC), compared with commercial AEM.

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A novel approach for stable anion exchange membrane: Self-assembled multilayer formation on the membrane via LbL method

Cited by 18 publications

References 19 publications

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Pore Size Distribution and Blend Composition Affect In Vitro Prevascularized Bone Matrix Formation on Poly(Vinyl Alcohol)/Gelatin Sponges

Preparation of proton block and highly conductive AEM by creating PANI dominated and hydrophobicity ion channels for sulfuric acid enrichment

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