Fabrication of polyacrylonitrile hollow fiber membranes from ionic liquid solutions

Kim, Dooli; Moreno, Nicolas; Nunes, Suzana Pereira

doi:10.1039/c5py01344e

Cited by 39 publications

(29 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Gibbs free energy of mixing (ΔG m ) is an informative parameter to predict the homogeneity of a polymer/solvent mixture [21]. In particular, if ΔG m is negative, the polymer is expected to completely dissolve in the solvent.…”

Section: Estimation Of Gibbs Free Energy Of Mixingmentioning

confidence: 99%

The effects of a co-solvent on fabrication of cellulose acetate membranes from solutions in 1-ethyl-3-methylimidazolium acetate

Kim

Nunes

2016

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

Ionic liquids have been considered green solvents for membrane fabrication. However, the high viscosity of their polymer solutions hinders the formation of membranes with strong mechanical properties. In this study, acetone was explored as a co-solvent with the ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) to dissolve cellulose acetate. The effects of acetone on the thermodynamic and kinetic aspects of the polymer solutions were studied and the physicochemical properties and separation capability of their resultant membranes were analyzed. The Hansen solubility parameters of [EMIM]OAc were measured by the software HSPiP and these data demonstrated that acetone was a suitable co-solvent to increase the solubility of cellulose acetate. The Gibbs free energy of mixing ΔG m was estimated to determine the proper composition of the polymer solution with better solubility. The study of the kinetics of phase separation showed that the demixing rate of the CA polymer solution in acetone and [EMIM]OAc was higher than that for solutions in [EMIM]OAc only. The membranes prepared from the former solution had higher water permeance and better mechanical stability than those prepared from the later solution. Adding acetone as a co-solvent opened the opportunity of fabricating membranes with higher polymer concentrations for higher separation capability and better mechanical properties.

show abstract

Section: Estimation Of Gibbs Free Energy Of Mixingmentioning

confidence: 99%

The effects of a co-solvent on fabrication of cellulose acetate membranes from solutions in 1-ethyl-3-methylimidazolium acetate

Kim

Nunes

2016

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…In a typical procedure, 2 g of graphite flakes were mixed into a round-bottomed flask containing 250 ml of H 2 SO 4 and the resulting mixture was stirred for 1 hr at 25 °C. About 10 g of KMnO 4 were added to the mixture under stirring until a viscous dark-green mixture was obtained and stirring was continued for 24 h at 25 °C. The mixture was transferred into an ice bath and a mixture containing 100 ml of H 2 O 2 and 500 ml of deionized (DI) water was added slowly.…”

Section: Graphene Oxide (Go) Synthesismentioning

confidence: 99%

“…We prepared flat sheet cellulose membranes by dissolving in 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) [1], hollow fiber membranes of polyacrylonitrile from solution in dimethyl sulfoxide/([EMIM]OAc [4] and of cellulose acetate in acetone/([EMIM]OAc [3], and hydroxyl-polytriazole in dimethyl carbonate/[EMIM]OAc [7]. PES is one of the most common membrane materials in the membrane industry for ultrafiltration and as support for reverse osmosis [8] with application in desalination, waste water treatment, biotechnology and pharmaceutical industries, oil-water separation, protein mixture separation, food industry and other filtration processes.…”

Section: Introductionmentioning

confidence: 99%

Polyethersulfone/Graphene Oxide Ultrafiltration Membranes from Solutions in Ionic Liquid

2017

Self Cite

View full text Add to dashboard Cite

Novel high flux polyethersulfone (PES) ultrafiltration membranes were fabricated by incorporating different amounts of graphene oxide (GO) sheets to PES as nanofillers. The membranes were prepared from solutions in 50/50 1-ethyl-3-methylimidazoliumdiethylphosphate/N,N-dimethyl formamide. It was observed that the water permeance increased from 550 to 800 L m -2 h -1 bar -1 , with incorporation of 1 wt% GO, keeping a molecular weight cutoff (MWCO) of approximately 32-34 kg mol -1 . Cross-sectional scanning electron microscopy images of GO/PES membranes showed the formation of ultrathin selective layer unlike pristine membranes. Contact angle measurements confirmed the increase of hydrophilicity, by increasing the GO concentration. The rejection of humic acid and bovine serum albumin was demonstrated. The mechanical properties were improved, compared with the pristine membranes. The performance was just above the trade-off relationship between permeance and separation factor for PES membranes reported in the literature.

show abstract

“…Ionic liquids are environmentally friendly solvents that result in membranes with excellent performance characteristics. Kim et al . found that the use of [EMIM]DEP as solvent resulted in PES membranes with a smaller molecular weight cut‐off (MWCO) and higher permeability than NMP, DMF, and DMA.…”

Section: Introductionmentioning

confidence: 99%

Potential of DMSO as greener solvent for PES ultra‐ and nanofiltration membrane preparation

Evenepoel

Wen

Tsehaye

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this article, the performance of polyethersulfone (PES) ultra‐ and nanofiltration membranes, prepared with the non‐toxic solvent dimethyl sulfoxide (DMSO), was investigated. The membranes were prepared by immersion precipitation via phase inversion. Experimental results proved that DMSO is a better alternative to N‐methyl‐2‐pyrrolidone (NMP) as solvent for PES ultrafiltration membranes as the membranes had a higher permeability and rejection of bovine serum albumin (BSA). An explanation was found based on experimental cloud point data and scanning electron microscopy images showing the morphology. The rejection of BSA and rose Bengal (RB) was proportional to the polymer concentration. On the contrary, the permeability decreased with increasing polymer concentration. For a casting thickness of 250 µm, an optimal balance between permeability and rejection of macromolecules for ultrafiltration was found at 24 wt % PES. The permeability was inversely proportional to the casting thickness, but a small decrease in rejection was observed when lowering the thickness. A good balance between permeability and rejection of RB was found, using a reference nanofiltration membrane of 28.5 wt % PES with 150 µm casting thickness. This membrane achieved a RB rejection of 95.3% and a pure water flux of 2.03 L m−2 h−1 bar−1. The membrane thickness and polymer concentration did not have a clear influence on the hydrophilicity of the membranes. It can be concluded that DMSO is a benign alternative as compared to traditional solvents such as NMP and also results in better PES membrane performances. DMSO is a perfectly suitable solvent for ultrafiltration applications and has potential to be used for nanofiltration applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46494.

show abstract

Fabrication of polyacrylonitrile hollow fiber membranes from ionic liquid solutions

Abstract: PAN hollow fiber membranes with good pore morphology have been fabricated using solvent mixtures of ionic liquids and DMSO, which has a lower toxicity than other commonly used polar organic solvents.

Cited by 39 publications

References 34 publications

The effects of a co-solvent on fabrication of cellulose acetate membranes from solutions in 1-ethyl-3-methylimidazolium acetate

The effects of a co-solvent on fabrication of cellulose acetate membranes from solutions in 1-ethyl-3-methylimidazolium acetate

Polyethersulfone/Graphene Oxide Ultrafiltration Membranes from Solutions in Ionic Liquid

Potential of DMSO as greener solvent for PES ultra‐ and nanofiltration membrane preparation

Contact Info

Product

Resources

About