Nitrate Selectivity and Transport Properties of a Novel Anion Exchange Membrane in Electrodialysis

Kikhavani, Tavan; Ashrafizadeh, Seyed Nezameddin; Bruggen, Bart Van der

doi:10.1016/j.electacta.2014.08.012

Cited by 73 publications

(28 citation statements)

References 33 publications

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“…However, the patterns of the membranes fabricated with low‐boiling solvents (formic acid and H 2 O/EtOH mixture) consisted of wide and broad peaks with a low intensity, and therefore, the major proportion of these membranes was formed by the amorphous phase. Paying attention to the point that the ratio of the area under the crystalline peaks to that under the amorphous peaks is a criterion for calculating the crystallinity of the prepared membranes, we observed that the reduction of the crystalline region area to the total area showed a decline in the polymer crystallinity . Accordingly, as calculated by eq.…”

Section: Resultsmentioning

confidence: 92%

Pebax membrane for CO₂/CH₄ separation: Effects of various solvents on morphology and performance

Isanejad

Azizi

Mohammadi

2016

J of Applied Polymer Sci

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In this study, the effects of different solvents on the morphology and permeation of poly(ether-block-amide) (Pebax-1657) membranes were investigated. Pebax membranes were fabricated via a solution casting method with five different solvents, that is, N,N-dimethyl formamide (DMF), N,N-dimethyl acetamide (DMAc), N-methyl-2-pyrrolidone (NMP), formic acid, and a mixture of ethanol (EtOH) with water (H 2 O). Cross-sectional scanning electron microscopy analysis of the membranes was performed to investigate the morphology of the prepared membranes. X-ray diffraction and Fourier transform infrared analysis were also carried out to characterize the membranes. The interactions of the polymer and various solvents were evaluated with Hansen solubility parameters. Permeation experiments for CO 2 and CH 4 gases were performed to study the effects of the solvents on the permeation properties of the membranes. The solvent properties, such as the molar volume, boiling point, and solubility parameters, were investigated as were the membranes characteristics, such as the crystallinity, d-spacing, and fractional free volume. The results obtained from the experiments show that the CO 2 permeability for the membranes prepared with different solvents followed this order: NMP > DMF > Formic acid > DMAc > H 2 O/EtOH mixture. With increasing molar volume, the gas permeability increased for all of the membranes, except for DMAc, which showed a lower permeability because of its highly crystalline structure. DMF showed a higher CO 2 /CH 4 ideal selectivity compared to the other membranes and, consequently, could be introduced as the best solvent from all aspects for the Pebax-1657 membrane.

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Section: Resultsmentioning

confidence: 92%

Pebax membrane for CO₂/CH₄ separation: Effects of various solvents on morphology and performance

Isanejad

Azizi

Mohammadi

2016

J of Applied Polymer Sci

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“…New applications of ED require the separation of monovalent ions from multivalent ions. Examples include the removal of F – or NO 3– for potable water production, and the separation of

{SO}_{4}^{2 -}

and

{CO}_{3}^{2 -}

to avoid scale formation in water treatment . Generally speaking, permselectivity of ions (different valence or charge) through the membranes is basically governed by their affinity toward the membranes (ion exchange equilibrium constant) and the migration speed in the membrane phase (mobility ratio among the ions).…”

Section: Introductionmentioning

confidence: 99%

Surface layer modification of AEMs by infiltration and photo‐cross‐linking to induce monovalent selectivity

et al. 2017

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Surface modification of anion exchange membranes (AEMs) by attaching a negatively charged layer is the main method for preparing monovalent anion selective membranes. However, tremendous increase of membrane resistance and poor long‐term stability of the modified membranes face great challenges. In this work, a photosensitive molecule (4,4‐diazostilbene‐2,2‐disulfonic acid disodium salt [DAS]) was infiltrated into the membrane surface and immobilized in the structure by cross‐linking under UV irradiation. This method introduced negative charge to the surface layer of the AEMs without increasing membrane thickness, leading to high performance membrane with high monovalent anion selectivity. The optimized membrane (D‐5) shows the highest perm‐selectivity of 11.21, which is superior to the commercial selective membrane Selemion® ASV and previously reported monovalent anion selective AEMs. Furthermore, the newly developed membrane exhibits excellent long‐term stability, which can maintain constant selectivity during the 80 h ED experiment. © 2017 American Institute of Chemical Engineers AIChE J, 64: 993–1000, 2018

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“…), electrodialysis (Kikhavani et al . ), ion exchange (Reyter et al . ), biological denitrification (Cameron & Schipper ; Zhao et al .…”

Section: Introductionmentioning

confidence: 99%

“…Various novel and efficient technologies have been employed to greatly improve nitrate removal based on traditional methods; these technologies include chemical denitrification , catalytic denitrification (Barrab es et al 2011), reverse osmosis (Richards et al 2010), electrodialysis (Kikhavani et al 2014), ion exchange (Reyter et al 2010), biological denitrification (Cameron & Schipper 2010;Zhao et al 2011), etc. Biological denitrification has become the focus of more researchers because of its advantages, including small occupied area, short processing time, and high efficiency, which reduces its investment cost.…”

Section: Introductionmentioning

confidence: 99%

Application of response surface methodology to optimize nitrate removal at low temperature by aerobic denitrificator Pseudomonas strain An‐1

Ren

Hou

et al. 2017

Water & Environment J

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Response surface methodology (RSM) was applied to optimize the conditions of nitrate removal by Pseudomonas strain AN‐1 at low temperature, which was isolated from aniline‐contaminated groundwater. A three‐factor, three‐level Box–Behnken experimental design and analysis of variance were combined with the obtained second‐order polynomial equation and applied for RSM optimization. By solving the second‐order polynomial equation and analysing the 3D response surface, a NO3−‐N concentration of 65.29 mg/L, an initial pH of 6.65, and an initial DO of 7.53 were identified as the optimized conditions. These conditions achieved a removal percentage of 53.7485% after 48 h at 10°C, which was in good agreement with the predicted 53.8085%. This study showed the excellent ability of the Pseudomonas strain AN‐1 to degrade nitrate at low temperatures, which provided a solid foundation for the further application of this microorganism in the treatment of nitrate‐contaminated groundwater.

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Nitrate Selectivity and Transport Properties of a Novel Anion Exchange Membrane in Electrodialysis

Cited by 73 publications

References 33 publications

Pebax membrane for CO₂/CH₄ separation: Effects of various solvents on morphology and performance

Pebax membrane for CO₂/CH₄ separation: Effects of various solvents on morphology and performance

Surface layer modification of AEMs by infiltration and photo‐cross‐linking to induce monovalent selectivity

Application of response surface methodology to optimize nitrate removal at low temperature by aerobic denitrificator Pseudomonas strain An‐1

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Nitrate Selectivity and Transport Properties of a Novel Anion Exchange Membrane in Electrodialysis

Cited by 73 publications

References 33 publications

Pebax membrane for CO2/CH4 separation: Effects of various solvents on morphology and performance

Pebax membrane for CO2/CH4 separation: Effects of various solvents on morphology and performance

Surface layer modification of AEMs by infiltration and photo‐cross‐linking to induce monovalent selectivity

Application of response surface methodology to optimize nitrate removal at low temperature by aerobic denitrificator Pseudomonas strain An‐1

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Pebax membrane for CO₂/CH₄ separation: Effects of various solvents on morphology and performance

Pebax membrane for CO₂/CH₄ separation: Effects of various solvents on morphology and performance