Fabrication of modified PVDF membrane in the presence of PVI polymer and evaluation of its performance in the filtration process

Valizadeh, Kamran; Heydarinasab, Amir; Hosseini, Seyed Saeid; Bazgir, Saeed

doi:10.1016/j.jiec.2021.11.016

Cited by 17 publications

(6 citation statements)

References 94 publications

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“…Membrane water flux is mainly caused by two factors: the hydrophilicity of the separation membrane material itself and the change of the microporous structure of the membrane. 47,48 The introduction of hydrophilic cellulose endows the PSF hollow fiber membrane with a large number of hydrophilic hydroxyl groups. Water molecules can be quickly transferred from the bulk solution to the surface of the separation membrane and quickly permeate into the micropores beneath the permeation side.…”

Section: Resultsmentioning

confidence: 99%

Enhanced water permeability of hollow fiber composite reverse osmosis membrane using porous α-cellulose/polysulfone hollow fiber membrane as the substrate

Li,

Fan,

et al. 2023

Textile Research Journal

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The hollow fiber composite (HFC) reverse osmosis (RO) membrane with a special self-supporting structure has attracted a great deal of attention in the fields of separation and purification. However, low permeability is an urgent problem restricting its wide application. A porous polysulfone (PSF) hollow fiber support membrane was fabricated through the dry–wet spinning technique and hydrophilic α-cellulose © powder was incorporated in the PSF membrane matrix to improve the membrane’s water permeability. The HFC RO membrane was prepared via the interfacial polymerization process on the inner surface of the C/PSF support membrane. The membrane morphology and surface hydrophilicity were evaluated through scanning electron microscopy observation and dynamic water contact angle (WCA) measurement. The effects of α-cellulose incorporation on the separation performance of PSF hollow fiber membranes and HFC RO membranes were investigated. The results showed that the surface hydrophilicity and water permeability of the PSF membrane were significantly improved after the introduction of α-cellulose. The WCA of the modified PSF support membrane decreased from 84.6° for the neat PSF membrane to 70.25°, and the pure water flux can reach a maximum value of 102.1 L/(m2 · h) (0.1 Mpa), which was 1.3 times that of the pristine membrane. The HFC RO membrane using the hydrophilic modified PSF membrane as the substrate exhibited an enhanced water flux of 15.6 L/(m2 · h) and, meanwhile, the membrane salt rejection remained above 97.6% (1.0 wt% NaCl aqueous solution, 0.7 Mpa). The HFC RO membrane showed extremely high rejection rates (99%) for different dyes (congo red and methylene blue). No obvious performance deterioration was observed for the HFC RO membrane during continuous vacuum membrane distillation (VMD) experiments for 60 h.

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Section: Resultsmentioning

confidence: 99%

Enhanced water permeability of hollow fiber composite reverse osmosis membrane using porous α-cellulose/polysulfone hollow fiber membrane as the substrate

Li,

Fan,

et al. 2023

Textile Research Journal

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“…The salt rejection ( R ,%) was calculated by measuring the conductivity of streams to determine the concentrations using a conductivity meter (RCB10B, AIPU, China) using Equation () 43 :

R = 1 - \frac{C_{Sp}}{C_{Sf}},

where C sp and C sf represent salt concentrations at permeate and feed, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The salt rejection (R,%) was calculated by measuring the conductivity of streams to determine the concentrations using a conductivity meter (RCB10B, AIPU, China) using Equation (4) 43 :…”

Section: Performance Analysismentioning

confidence: 99%

Development of polyamide/polyacrylonitrile thin film composite RO membranes by interfacial polymerization assisted with an aromatic/aliphatic organic solvent mixture

Mokarinezhad

Hosseini

Nxumalo

2023

J of Applied Polymer Sci

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The proper control of polymerization is a prerequisite in fabrication of thin film composite reverse osmosis (RO) membranes. But it not trivial when hydrophilic substrates are used. Herein, we report an innovative approach which involves using an aromatic/aliphatic solvent mixture of toluene and n‐hexane as the organic phase for interfacial polymerization. Membranes were tuned by using a customized developed polyacrylonitrile (PAN) substrate and exploring the impacts of organic solvent and curing temperatures on their morphology and performance characteristics. Results revealed that increasing the temperature of organic phase to 20°C improved salt rejection significantly to 98.6% with the flux of 16.1 LMH. However, its further increase to 30°C was not beneficial due to formation of a looser chain packing which led to rejection drop. In addition, raising curing temperature to 90°C was not favorable due to transformation of surface morphology from ridge‐and‐valley to nodular structure, accompanied with defective sites at the selective layer and insufficient degree of crosslinking evidenced by declines in both flux and rejection to 11.1 LMH and 83.4%, respectively. Overall, the findings suggested that an optimal performance could be obtained by using a solvent mixture of toluene/n‐hexane (1,1) and setting organic solvent and curing temperatures to 20 and 70°C, respectively.

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“…190,194 PVDF Polyvinylidene fluoride (PVDF) with melting temperature of 165-175 C and chemical formula of (C 2 H 2 F 2 ) n has been used as a substrate in different applications. 236,237 PVDF is a semicrystalline fluoropolymer with high chemical resistance and a reasonable hydrophobicity. 238,239 In a recent study, a CVD coating was created on the surface of Ni substrates.…”

Section: Petmentioning

confidence: 99%

Advances in surface modification and functionalization for tailoring the characteristics of thin films and membranes via chemical vapor deposition techniques

Mostafavi

Mishra

Gallucci

et al. 2023

J of Applied Polymer Sci

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Advanced materials are among the prime drivers for technological revolutions and transformation in quality of lives. Over time, several modification techniques have emerged enabling development of novel materials with extraordinary features. The present review aims to introduce various promising chemical and physical surface modification techniques instrumental for tailoring the characteristics of thin films and membranes. Meticulous discussions are provided over chemical vapor deposition (CVD) techniques evolved for addressing the demands for materials with desired functionalities. Also, essential criteria for the selection of substrates, modifying and precursor materials for an effective CVD modification are elaborated. Investigations are extended to unraveling the role of various process parameters on the quality and properties of deposition. Special attention is paid to the significance and performance of CVD‐based membranes and thin films for industrial applications ranging from desalination and water treatment to energy and environment, biomedical and life science as well as packaging. The goal has been to establish a scientific platform for a timely tracking of the prevailing trends in exploitation of CVD techniques and highlighting the unexplored opportunities. This also helps in identification of the scientific and technical gaps and setting directions for further progress in the fields of thin films and membranes.

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Fabrication of modified PVDF membrane in the presence of PVI polymer and evaluation of its performance in the filtration process

Cited by 17 publications

References 94 publications

Enhanced water permeability of hollow fiber composite reverse osmosis membrane using porous α-cellulose/polysulfone hollow fiber membrane as the substrate

Enhanced water permeability of hollow fiber composite reverse osmosis membrane using porous α-cellulose/polysulfone hollow fiber membrane as the substrate

Development of polyamide/polyacrylonitrile thin film composite RO membranes by interfacial polymerization assisted with an aromatic/aliphatic organic solvent mixture

Advances in surface modification and functionalization for tailoring the characteristics of thin films and membranes via chemical vapor deposition techniques

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