Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Cellulose membranes for organic solvent nanofiltration
Download
index.pdf
Date
2016
Author
Sukma, Faqih Muhamad
Metadata
Show full item record
Item Usage Stats
268
views
264
downloads
Cite This
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 there is an alternative way of dissolving cellulose using ionic liquids. The aim of this study is to fabricate cellulose membranes for OSN via phase inversion using ionic liquids as solvents. 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) was used as the ionic liquid to dissolve cellulose, while acetone was used as cosolvent and water as nonsolvent. Solutions of probe molecules in both ethanol and water were used to study the separation performance of membranes. It was observed that increased cellulose concentration in the membrane precursor solution, decreased membrane permeance and increased rejection of Bromothymol Blue (BTB) and Cresol Red (CR) in ethanol. Solute-solvent-membrane interactions have an important role in determining the rejection performance as a higher molar volume dye, Brilliant Blue R (BBR), was retained less than CR, BTB, and Crystal Violet (CV) when dissolved in ethanol. Change of solvent also affected the rejection as was shown by a higher value of BBR rejection in water and the absence of rejection of CV as opposed to the behavior in ethanol. Drying the membranes increased the rejection but decreased the permeances by at least an order of magnitude. Compared to OSN membranes reported in literature, the membranes fabricated in our study have comparable performance.
Subject Keywords
Cellulose.
,
Nanofiltration.
,
Organic solvents.
,
Membranes (Technology).
URI
http://etd.lib.metu.edu.tr/upload/12620654/index.pdf
https://hdl.handle.net/11511/26196
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Cellulose membranes for organic solvent nanofiltration
Sukma, F. M.; Çulfaz Emecen, Pınar Zeynep (2018-01-01)
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 th...
Cellulose-based membranes via phase inversion using [EMIM]OAc-DMSO mixtures as solvent
Durmaz, Elif Nur; Çulfaz Emecen, Pınar Zeynep (2018-03-16)
Cellulose and cellulose acetate membranes were fabricated by phase inversion from their solutions in 1-ethyl-3-methylimidazolium acetate ([EMIM] OAc), or its mixture with dimethyl sulfoxide (DMSO). Inclusion of DMSO in the solution decreased crystallinity and rejection for both polymers. When cellulose solutions were coagulated in ethanol crystallinity and rejections were lower, and cellulose acetate membranes coagulated in ethanol had a loose, macroporous morphology, which was attributed to the poor nonsol...
Cellulose membranes via alkaline hydrolysis of cellullose acetate membranes and their application in organic solvents
İmir, Zeyne; Çulfaz Emecen, Pınar Zeynep; Department of Chemical Engineering (2019)
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 ...
Celulose Membranes for Organic Solvent Nanofiltration
Çulfaz Emecen, Pınar Zeynep; Elif Nur, Durmaz (2015-11-19)
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 ...
Effect of crosslinking on organic solvent nanofiltration performance of cellulose membranes
Konca, Kübra; Çulfaz Emecen, Pınar Zeynep; Department of Chemical Engineering (2018)
Nanofiltration is a membrane process capable of separation of small molecules and multivalent ions due to their size and/or charge. NF is mainly used in aqueous applications. However, there are many processes that can take advantages of NF in molecules separation dissolved in organic solvents. Main challenge in Organic Solvent Nanofiltration is the limited number of membranes which can withstand a wide range solvents and have stable, predictable separation performance. Cellulose is an alternative polymer th...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
F. M. Sukma, “Cellulose membranes for organic solvent nanofiltration,” M.S. - Master of Science, Middle East Technical University, 2016.