Celulose Membranes for Organic Solvent Nanofiltration

Date

2015-11-19

Author

Çulfaz Emecen, Pınar Zeynep
Elif Nur, Durmaz

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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.m2bar 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.m2bar. 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, Ionic liquid, Organic Solvent Nanofiltration, Dye, Ethanol

URI

https://hdl.handle.net/11511/72747

Conference Name

5th International Conference on Organic Solvent Nanofiltration (17 - 19 Kasım 2015)

Collections

Department of Chemical Engineering, Conference / Seminar

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Effect of carboxylic acid crosslinking of cellulose membranes on nanofiltration performance in ethanol and dimethylsulfoxide Konca, Kubra; Çulfaz Emecen, Pınar Zeynep (2019-10-01) Cellulose membranes were fabricated via phase inversion using 1-ethyl-3-methylimidazolium acetate as solvent and acetone as volatile cosolvent. 1,2,3,4-butanetetracarboxylic acid was used to partially crosslink the hydroxyl groups of cellulose, thereby changing mechanical properties of the membranes and the interactions with solvents, ethanol and dimethyl sulfoxide, and solutes. Rejection of dyes of similar size, Bromothymol Blue, Rose Bengal and Crystal Violet were shown to correlate inversely with sorptio...
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Citation Formats

P. Z. Çulfaz Emecen and D. Elif Nur, “Celulose Membranes for Organic Solvent Nanofiltration,” presented at the 5th International Conference on Organic Solvent Nanofiltration (17 - 19 Kasım 2015), 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/72747.