Preparation of polyvinylidene fluoride blend anion exchange membranes via non-solvent induced phase inversion for desalination and fluoride removal

Mondal, Rakhi; Pal, Sandip; Bhalani, Dixit V.; Bhadja, Vaibhavee; Chatterjee, Uma; Jewrajka, Suresh K.

doi:10.1016/j.desal.2018.07.032

Cited by 43 publications

(20 citation statements)

References 36 publications

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“…This reflects in the overall hydrophobicity of the membranes. The t – (NaF) and t – (NaCl) of the M-C10/AgNPs membrane are higher than those of the other two AgNPs membranes due to the lower water uptake of the previous membrane. , …”

Section: Results and Discussionmentioning

confidence: 89%

“…The water desalination (NaCl concentration: 2000 mg/L) and removal of fluoride (F – , F – concentration: 5.5 and 11 mg/L) ions from water by the ED process were determined by the procedure reported earlier by us Figure shows the schematic diagram and membrane arrangement in the ED unit.…”

Section: Characterizationmentioning

confidence: 99%

“…Both the cation exchange membranes (CEMs) and anion exchange membranes (AEMs) are used in this ED process. AEMs are also used in alkaline fuel cells and vanadium redox flow battery applications. − AEMs are also used to reduce the F – ion concentration in water by Donnan dialysis (DD) and ED processes. − During ED operation, because of the high concentration of divalent salts in wastewater, there is always a risk of precipitation of this salt to the membrane surface, which causes membrane scaling and biofouling . The performance of the membranes declines due to biofilm formation, and thus, operation and maintenance cost increases.…”

Section: Introductionmentioning

confidence: 99%

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Composite Anion Exchange Membranes with Antibacterial Properties for Desalination and Fluoride Ion Removal

2021

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The contamination of fluoride ions in groundwater and membrane fouling due to the growth of bacteria in wastewater are serious problems. We report the preparation of a composite anion exchange membrane (AEM) with enhanced antimicrobial properties for water desalination and fluoride ions removal from water by electrodialysis (ED). The composite membranes were prepared by impregnating silver nanoparticles (AgNPs) in the N-alkylated terpolymer of poly(acrylonitrile), poly(n-butyl acrylate), and poly[(2-dimethyl aminoethyl) methacrylate], followed by cross-linking by the reaction with hydrazine hydrate. The key factors are the variation of alkyl chain length attached with −N(CH 3 ) 2 − in the membrane matrix, optimizing the water uptake and impregnation of AgNPs. The presence of AgNPs in the AEMs was confirmed by UV−visible spectroscopy, transmission electron microscopy, and EDAX mapping. The incorporation of 0.03 wt % AgNPs in the AEMs increases 8.5−12.5% water uptake and 8−12% ionic conductivity. The representative M-C10/AgNPs membrane exhibited 0.72−0.74 kWh/kg power consumption and 96−95% current efficiency during the removal of fluoride ions (5.5−11 mg/L) from water containing NaCl (concentration: 2000 mg/L) by ED process. No detectable leaching of AgNPs was observed by continuous exposure of the composite AEMs in water at 50 °C for 15 days.

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Section: Results and Discussionmentioning

confidence: 89%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composite Anion Exchange Membranes with Antibacterial Properties for Desalination and Fluoride Ion Removal

2021

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“…Anion exchange membranes (AEMs), which are a kind of solid-state polyelectrolyte, , have gained great attention in various fields such as energy storage systems, − electrodialysis devices, , ion separation, , and desalination. , Ion-conducting property is the key parameter for AEMs in these applications, which greatly affects the ionic conductivity, dialysis coefficient, and performance of related devices . Therefore, different strategies have been developed to improve the ion-conducting property of AEMs, such as the construction of ordered ion channels, phase-separated structures, and modification of cationic groups .…”

Section: Introductionmentioning

confidence: 99%

Role of Ionic Concentration and Distribution in Anionic Conductivity: Case Study on a Series of Cobaltocenium-Containing Anion Exchange Membranes with Precise Structure Control

Yang

Yan

et al. 2022

Macromolecules

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Three new anion exchange membranes (AEMs) (P1, P2, P3) with varied numbers (1, 2, 3) of cobaltocenium substituents were synthesized by ring-opening metathesis polymerization (ROMP). The living polymerization characteristic of ROMP endows the resulting AEMs with tunable ionic concentration and precise structure control, which provide an ideal model to investigate the influence of ionic concentration and substituent on the ion-conducting property of AEMs. According to Mohr titration and the alternating-current impedance method, the as-prepared AEMs demonstrated an obvious ionic concentration and substituent influence on ionic conductivity in an ordering of P2 > P3 > P1. In addition, the hydrophilic/hydrophobic microphase separation structures of the three AEMs were observed by atomic force microscopy (AFM), transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS). To further verify the relationship between ionic concentration, substituent, and ionic conductivity, molecular simulation was also used to calculate the ionic diffusivity of the three AEMs, and the result of simulation computation was consistent with the experimental result. Moreover, a tentative anion exchange membrane fuel cell (AEMFC) performance test also indicates the corresponding sequence of P2 > P3 > P1. The current work may provide an effective method for the rational design and preparation of AEMs, as well as guidance in investigating the structure−property relationship.

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“…10 However, at higher values, it induces adverse effects on human health such as dental and skeletal uorosis, bone fragility, osteoporosis and arthritis. 8,11 To solve these issues, several processes have been used to limit the concentration of uoride in water, like adsorption, 11,12 coagulation, 13 membrane ltration, 14 ion exchange, 15 electrochemical oxidation, 16 electrootation 11 and electrocoagulation. 17 Among these methods, the adsorption process is considered as economic, sustainable and eco-friendly.…”

Section: Introductionmentioning

confidence: 99%

Functional activated carbon: from synthesis to groundwater fluoride removal

et al. 2022

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Preparation of polyvinylidene fluoride blend anion exchange membranes via non-solvent induced phase inversion for desalination and fluoride removal

Cited by 43 publications

References 36 publications

Composite Anion Exchange Membranes with Antibacterial Properties for Desalination and Fluoride Ion Removal

Composite Anion Exchange Membranes with Antibacterial Properties for Desalination and Fluoride Ion Removal

Role of Ionic Concentration and Distribution in Anionic Conductivity: Case Study on a Series of Cobaltocenium-Containing Anion Exchange Membranes with Precise Structure Control

Functional activated carbon: from synthesis to groundwater fluoride removal

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