Effect of PEG additive and coagulation bath temperature on the morphology, permeability and thermal/chemical stability of asymmetric CA membranes

Saljoughi, Ehsan; Amirilargani, Mohammad; Mohammadi, Toraj

doi:10.1016/j.desal.2010.05.046

Cited by 195 publications

(143 citation statements)

References 29 publications

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“…Flat sheet polysulfone-based membranes were prepared by phase inversion method via immersion precipitation in water coagulation bath as reported in literature [27][28][29] . Several polysulfone solutions were prepared by dissolving a measured amount of polymer (16 wt %) in NMP at room temperature.…”

Section: Membrane Preparationmentioning

confidence: 99%

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

et al. 2017

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Polymer solutions of polysulfone (PSf) and methylcellulose (MC) in 1-methyl-2-pyrrolidone (NMP) were used to prepare ultrafiltration membranes by the phase inversion technique via immersion precipitation. The effect of MC additive on the structure and performances of the membranes was studied. The obtained membranes were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR-ATR), equilibrium water content (EWC), water contact angle, porosity and ultrafiltration experiments of polyethylene glycol solutions. It was found that all the PSf/MC membranes had higher porosity, more hydrophilic surface and more vertically finger like pores than PSf membrane. With an increase in MC content in the casting solution from 0.5% to 1.5%, the hydraulic permeability increases from 17.17 to 118.46 L.m -2 .h -1 .bar -1 , while the rejection decreases from 91.82% to 64.45% with PEG 35000. DSC scan and FTIR analysis confirmed that methylcellulose was trapped in the membranes matrix.

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Section: Membrane Preparationmentioning

confidence: 99%

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

et al. 2017

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“…5, where porosity increased along with the addition of PEG into casting solution of membrane with 1% PEG and 3% PEG. This was caused by the increasing of PEG initiated macro-void formations and membrane porosity [13]. It was equal with Hu et al (2014) studies, that additive in the casting solutions would contribute porosity increasing.…”

Section: Membrane Performance Characterisationmentioning

confidence: 87%

“…This was caused by bulk composition in the casting solution formed compact sublayer of membrane, and decreased porosity [13].…”

Section: Membrane Performance Characterisationmentioning

confidence: 99%

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Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification

Fitri¹,

Widiastuti²

2017

AIP Conference Proceedings

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Abstract. Polyvinylidene Fluoride (PVDF)/Cellulose Acetate (CA) blend membrane with polyethylene (PEG) addition of casting solution were synthesised to determine its morphology. This purpose of this research is to investigate the effect of PEG addition to membrane performance and its application to the clarification of apple juice. The membranes were prepared from polymer blends of CA and PVDF, dimethyl acetamide (DMAc) as solvent, and PEG as additive. Phase inversion was used to prepare membranes by mixing the polymer blends, solvent and additive to be reacted at temperature 60 °C for 24 hours. The variation of PEG weight percentage were 0, 1 wt%, 3 wt%, and 5 wt%. The addition of PEG increased porosity and fluxes, but decreased membrane rejection. Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM), and Fourier Transform Infrared (FTIR) were applied to evaluate the morphology of membranes, which investigated increasing of pore size, pore distribution, and surface roughness. Apple juice clarification by membrane with 1% PEG was obtained 95,1% clearer than the pure sample.

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“…The increment of the porosity can be related with the increase of the macrovoid number and size in the membrane structure. The formation of the phase inversion membrane is controlled by phase equilibrium and diffusivities between the components in the dope solution and coagulation bath 7 . Immersion process of the dope polymer solution into the coagulation bath is a demixing process, where nuclei of a polymer-poor phase continue to grow with the continuation of the solvent and nonsolvent exchange until the polymer concentration at their limits becomes too high, and solidification occurs 7 .…”

Section: Resultsmentioning

confidence: 99%

Effect of coagulation bath temperature during preparation of PES hollow fiber supported liquid membrane for acetic acid removal

Sanmugam

Harruddin

Saufi

2017

Chem. Eng. Res. Bull.

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Acetic acid is a byproduct of acid hydrolysis of biomass during sugar recovery step in biofuel production. Acetic acid can inhibit the enzyme used during fermentation of sugar to the ethanol. Hollow fiber supported liquid membrane (SLM) was used in this study to remove acetic acid from aqueous solution. Liquid membrane was formulated using trioctylamine and 2-ethyl hexanol as a carrier and solvent, respectively. The hollow fiber membrane support was prepared from 15 wt.% polyethersulfone, 42.5 wt.% polyethyleneglycol 200 and 42.5 wt.% dimethylacetamide. The effect of coagulation bath temperature (CBT) at 30ºC, 40ºC and 50ºC during hollow fiber membrane spinning process was investigated. The porosity of the membrane increased as the CBT increased. The porosity of the membrane prepared using CBT of 30ºC, 40ºC and 50ºC were 35.7%, 46.7% and 61.6%, respectively. SLM process using hollow fiber membrane prepared at 50ºC of coagulation bath was able to remove 52% of acetic acid from the aqueous solution.

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Effect of PEG additive and coagulation bath temperature on the morphology, permeability and thermal/chemical stability of asymmetric CA membranes

Cited by 195 publications

References 29 publications

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification

Effect of coagulation bath temperature during preparation of PES hollow fiber supported liquid membrane for acetic acid removal

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