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Cellulose membranes for organic solvent nanofiltration
Date
2018-01-01
Author
Sukma, F. M.
Çulfaz Emecen, Pınar Zeynep
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Cellulose membranes were fabricated by phase inversion from solutions of cellulose in 1-ethyl-3-methylimidazolium acetate ([EMIM] OAc) as solvent and acetone as volatile cosolvent. The rejection of Bromothymol Blue ( 624 Da) in ethanol increased and the permeance decreased by increasing the cellulose concentration in the solution prior to coagulation, either by having more cellulose in the starting solution or by evaporating the volatile cosolvent. Drying the membranes after coagulation further increased the dye rejection while decreased the permeance by an order of magnitude. The highest Bromothymol Blue rejection obtained was 94.0% accompanied by a permeance of 0.3 L/h. m(2)bar with the membrane fabricated from a 20% cellulose -80% [EMIM] OAc solution and dried after coagulation. The membrane fabricated from a 12% cellulose -63% [EMIM] OAc 20% acetone solution and subjected to pre-evaporation before coagulation had 69.8% Bromothymol Blue rejection, with a permeance of 8.4 L/h. m(2)bar. Overall, the membranes' separation performance was comparable to OSN membranes reported in literature. The rejection for dyes of different charge and polarity was observed to be strongly dependent on solute-membrane interactions, Crystal Violet that did not sorb at all in the membrane was rejected while Brilliant Blue R, which sorbed to a large extent was not. The affinity of dyes to the membrane was attributed to both electrostatic and hydrogen bonding interactions.
Subject Keywords
Cellulose membrane
,
Lonic liquid
,
Organic Solvent Nanofiltration
,
Dye
,
Ethanol
URI
https://hdl.handle.net/11511/35910
Journal
JOURNAL OF MEMBRANE SCIENCE
DOI
https://doi.org/10.1016/j.memsci.2017.09.080
Collections
Department of Chemical Engineering, Article
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Cellulose membranes were fabricated by phase inversion from solutions of cellulose in 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) as solvent and acetone as volatile cosolvent. The rejection of Bromothymol Blue (624 Da) in ethanol increased and the permeance decreased by increasing the cellulose concentration in the solution prior to coagulation, either by having more cellulose in the starting solution or by evaporating the volatile cosolvent. Drying the membranes after coagulation further increased the ...
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Cellulose is an alternative polymer that can be used in Organic Solvent Nanofiltration (OSN) where lack of chemically-stable membranes is a major problem. Cellulose, due to strong inter and intramolecular hydrogen bonding, is difficult to dissolve in many solvents, which is an advantage for OSN applications. Common solvent systems like Sodium Hydroxide/Carbon Disulfide (NaOH/CS2) or N-Methylmorpholine-N-oxide (NMMO) for cellulose solubilization are either toxic or unstable. Recent studies have shown that th...
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Cellulose, the most abundant polymer in nature, is an attractive membrane material. Hydroxyl groups in the polymer chain make it hydrophilic, which makes cellulose membranes fouling resistant. Intra and intermolecular hydrogen bonding due to these groups on the other hand gives cellulose solvent resistance which is an attractive property for membrane filtration in organic solvents. Although cellulose is insoluble in many solvents, ionic liquids dissolve cellulose so that cellulose membranes can be prepared ...
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F. M. Sukma and P. Z. Çulfaz Emecen, “Cellulose membranes for organic solvent nanofiltration,”
JOURNAL OF MEMBRANE SCIENCE
, pp. 329–336, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35910.