Desalination efficiency of a novel bipolar membrane based on functionalized polysulfone

Venugopal, Krishnaveni; Dharmalingam, Sangeetha

doi:10.1016/j.desal.2012.04.006

Cited by 34 publications

(20 citation statements)

References 24 publications

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“…We note that this temperature is higher than the maximum temperature used for water treatment by membrane separation. 48 The DSC technique was used to evaluate the thermal stability and miscibility of membrane mixtures (Fig. 4).…”

Section: Results and Discussion Thermal Analysismentioning

confidence: 99%

Thermal Annealing Effect on Morphology and Performance of Polysulfone-Cellulose Acetate Membranes: Application for Water Defluoridation

Aburideh¹,

Merzouk²,

Naceur³

et al. 2019

Cellulose Chem. Technol.

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The performance of a membrane is a key factor in predicting its reliability. Designing membranes depends on their morphological and molecular characteristics for specific applications. This work focuses on improving the behavior of a cellulose acetate-polysulfone PSf-CA membrane in the presence of PEG 400 additive, in different concentrations, using thermal annealing on the surface of the membrane. The membrane was prepared by the NIPS phase inversion process; the surfaces of the obtained membrane films were subjected to thermal annealing at 75 °C for 15 seconds. The influence of the composition of the polymer mixture, the concentration of the additive and the annealing effect on the performance of the membranes were studied. The membranes were characterized in terms of contact angle and mechanical resistance, as well as by FTIR, DSC, ATG and SEM. Measurements of the contact angle confirmed the hydrophilic character, which increased with a rising level of PEG in the casting solution. The results showed that the permeation flux increased for the highest PSf/PEG ratio. SEM results suggested that the annealing treatment improved the surface of the membrane; the surface layers became denser and smoother, with a porous intermediate layer, as CA concentrations rose in the mixture. The fluoride reject was evaluated for all the membranes, the obtained fluoride retention rates were very satisfactory and met the standards required by WHO.

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Section: Results and Discussion Thermal Analysismentioning

confidence: 99%

Thermal Annealing Effect on Morphology and Performance of Polysulfone-Cellulose Acetate Membranes: Application for Water Defluoridation

Aburideh¹,

Merzouk²,

Naceur³

et al. 2019

Cellulose Chem. Technol.

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“…Calculations. The current efficiency, energy consumption, and transport number of ions in the process (Badruzzaman et al, 2009;Rajesh et al, 2011;Shi et al, 2010;Venugopal and Dharmalingam, 2012;Zhou et al,, 2009) were analyzed using the 12 cm x 10 cm Effective membrane area 120 cm 2 following eqs 1, 2, and 3:…”

Section: Methodsmentioning

confidence: 99%

Utilization of Bipolar Membrane Electrodialysis for Salt Water Treatment

Venugopal

Dharmalingam²

2013

Water Environment Research

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Bipolar ion-exchange membranes, using polystyrene ethylene utylenes polystyrene (PSEBS) with polyvinyl alcohol as the intermediate, were fabricated and evaluated for their potential to remove secondary salts from lab-prepared salt solutions. Experiments were carried out in batch re-circulation mode. The mechanical properties and microscopic images of the membranes were analyzed before, during, and after the electrodialysis process. The performance of the membranes in the stack was evaluated in terms of energy consumption and current efficiency, and found to be 1.07 Wh/mol and 0.67, respectively. Commercially-produced membranes were used as a comparison to the PSEBS-based membranes. In the case of the commercial membrane, polystyrene divinylbenzene, the values for the above parameters were observed to be 2.59 Wh/mol and 0.63, respectively. In addition, other parameters, such as transport number of ions and acid - alkali production, were evaluated for both PSEBS-based and commercially-produced membranes. Results indicated that PSEBS-based membranes exhibited better performance than the commercial membranes.

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“…The conductivity of the membranes was determined using impedance spectroscopy as described in the supporting information S2. Water absorption and IEC for the prepared membranes were measured using the similar procedure as discussed earlier [19]. The chemical stability of membranes was analyzed by accelerating the degradation process using a solution containing 4 ppm of ammonium iron (II) sulfate hexahydrate and 15 ml of H 2 O 2 (3%) (Fentons reagent) in 500 ml of distilled water at 60˚C for about an hour.…”

Section: Characterization Of Reinforced Iemsmentioning

confidence: 99%

“…The generated peroxides attacked the polymer chains to undergo faster degradation. All the subjected samples were then checked for their water absorption, IEC, and conductivity values as per the standard procedures [19] and the discussion of the observed results were reported earlier [18]. While in the case of BPM-I, although the reinforced fibers held the IEMs strongly, due to the enhanced degrading mechanism, the incorporated hydrophilic resins and functional groups that were present on the surface leached out from the membranes due to loosening of the fibers upon swelling which resulted in lower water absorption (value of about 66% than its initial 88%) and conductivity values (value of about 5.1 × 10 −3 S cm −1 from its initial 6.9 × 10 −3 S cm −1 ) [25].…”

Section: Chemical Stabilitymentioning

confidence: 99%

Development of monopolar and platinum intermediate bipolar membranes: application in desalting brine solution

Venugopal

Dharmalingam

2016

Desalination and Water Treatment

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A B S T R A C TThe desalination process parameters like current efficiency (CE), energy consumption, and acid-base production for the fabricated bipolar membrane (BPM) electrodialysis unit (five compartments of 120 cm 2 active areas) were investigated in this paper using monopolarand bipolar-based ion-exchange membranes (IEMs). Also, the performance of the fabricated unit in removing NaCl was assessed in terms of salinity. Polystyrene-ethylene-butylenepolystyrene was functionalized to prepare the monopolar and bipolar IEMs. In the case of BPM, platinum was used as the intermediate layer. The synthesized IEMs were characterized thermally and by contact angle measurements. A commercially procured monopolar and bipolar ion-exchange membrane made of polystyrene-divinylbenzene was also evaluated for the purpose of comparison. The electrodialysis process using these IEMs reached the highest CE of 66 and 38% with the lowest energy consumption of 0.24 Wh and 1.60 Wh for the synthesized and commercial membrane, respectively.

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Desalination efficiency of a novel bipolar membrane based on functionalized polysulfone

Cited by 34 publications

References 24 publications

Thermal Annealing Effect on Morphology and Performance of Polysulfone-Cellulose Acetate Membranes: Application for Water Defluoridation

Thermal Annealing Effect on Morphology and Performance of Polysulfone-Cellulose Acetate Membranes: Application for Water Defluoridation

Utilization of Bipolar Membrane Electrodialysis for Salt Water Treatment

Development of monopolar and platinum intermediate bipolar membranes: application in desalting brine solution

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