Investigation of polyvinylchloride and cellulose acetate blend membranes for desalination

El–Gendi, Ayman; Abdallah, Heba; Amin, Ashraf; Amin, Sh.K.

doi:10.1016/j.molstruc.2017.05.122

Cited by 37 publications

(21 citation statements)

References 24 publications

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“…Very few studies appear in recent literature. For example, blended polyvinylchloride/cellulose acetate (PVC/CA) membranes for seawater desalination were proposed by El-Gendi et al [224]. Among the various polymeric solution compositions used, blended PVC/CA membrane synthesized using 16% PVC, 3% CA, and 1% polyethylene glycol (PEG) exhibited the highest tensile strength.…”

Section: Integrally-skinned Asymmetric Membranesmentioning

confidence: 99%

Reverse osmosis desalination: A state-of-the-art review

et al. 2019

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Water scarcity is a grand challenge that has always stimulated research interests in finding effective means for pure water production. In this context, reverse osmosis (RO) is considered the leading and the most optimized membrane-based desalination process that is currently dominating the desalination market. In this review, various aspects of RO desalination are reviewed. Theories and models related to concentration polarization and membrane transport, as well as merits and drawbacks of these models in predicting polarization effects, are discussed. An updated review of studies related to membrane modules (plate and frame, tubular, spiral wound, and hollow fiber) and membrane characterization are provided. The review also discusses membrane cleaning and different pre-treatment technologies in place for RO desalination, such as feed-water pre-treatment and biocides. RO pre-treatment technologies, which include conventional (e.g., coagulationflocculation, media filtration, disinfection, scale inhibition) and non-conventional (e.g., MF, UF, and NF) are reviewed and their relative attributes are compared. As per the available literature, UF, MF and coagulation-flocculation are considered the most widely used pre-treatment technologies. In addition, this review discusses membrane fouling, which represents a serious challenge in RO processes due to its significant contribution to energy requirements and process economy (e.g., flux decline, permeate quality, membrane lifespan, increased feed pressure, increased pre-treatment and membrane maintenance cost). Different membrane fouling types, such as colloidal, organic, inorganic, and biological fouling, are addressed in this review. Principles of RO process design and the embedded economic and energy considerations are discussed. In general, cost of water desalination has dropped to values that made it a viable option, comparable even to conventional water treatment methods. Finally, an overview of hybrid RO desalination processes and the current challenges faced by RO desalination processes are presented and discussed.

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Section: Integrally-skinned Asymmetric Membranesmentioning

confidence: 99%

Reverse osmosis desalination: A state-of-the-art review

et al. 2019

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“…The change in the bottom layer structure of the PVC blend membrane is also evidence of the increased water permeability ( Figure 3). As reported by many authors, the addition of an appropriate amount of hydrophilic polymer to the dope solution might enhance the membrane pores 7, 15, 21, 22 , and, consequently, high permeation would be obtained. In this work, the highest water permeability reached 45.618l/m 2 .h.atm, which was obtained in the case of the blend membrane with the PF127 concentration of 7wt%.…”

Section: Resultsmentioning

confidence: 78%

Morphology and performance of polyvinyl chloride membrane modified with Pluronic F127

et al. 2018

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Attempts to modify the morphology of membrane for application in industrial separation are being undertaken by many researchers. The present study discusses the morphological modification of polyvinyl chloride (PVC) membrane by combining the hydrophilic surfactant Pluronic F127 (PF127) in a polymer solution to improve the performance of the membrane. The membrane is formed using the non-solvent induced-phase separation (NIPS) method. PF127 is added to the membrane solution as a membrane modifying agent. The effects of the surfactant concentration in the dope solution on the permeability of pure water, solute rejection, hydrophilic characteristics, and membrane morphology are investigated. Higher concentrations of PF127 had a significant effect on the permeability of pure water. The highest membrane permeation was 45.65 l/m .hr.atm with the addition of 7% PF127 additive. PF127 is successfully proposed as a membrane pore-forming agent in this work; the blending of this additive in appropriate amounts in the polymer solution is adequate to improve the performance of the PVC membrane.

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“…The most intense peak was observed for membrane F, which contains 15% by weight of PEG, decreasing as the content of PEG decreases in the mixture. 52 The absence of the peak was noted for the membrane G, which does not contain PEG. We also noted that it becomes important as PEG increases in the mixture.…”

Section: Ftir Analysis Of Membranesmentioning

confidence: 96%

“…Meanwhile, the rejection increased with increasing operating pressure at the same feed concentration. 52 Secondly, the rejection varies inversely with the flux, while membrane morphology and the heat treatment improved the rejection, and affected the flux.…”

Section: Fluoride Rejectionmentioning

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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Investigation of polyvinylchloride and cellulose acetate blend membranes for desalination

Cited by 37 publications

References 24 publications

Reverse osmosis desalination: A state-of-the-art review

Reverse osmosis desalination: A state-of-the-art review

Morphology and performance of polyvinyl chloride membrane modified with Pluronic F127

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

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