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Open AccessFeature PaperArticle

CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method

1
Institute for Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany
2
Faculty of Applied Natural Sciences, TH Köln, Kaiser-Wilhelm-Allee, Gebäude E39, 51373 Leverkusen, Germany
3
Institute of Chemical Process Engineering and Plant Design, TH Köln, Betzdorfer Str. 2, 50679 Köln, Germany
4
Future Carbon GmbH, Ritter-von-Eitzenberger-Str. 24, 95448 Bayreuth, Germany
5
ADVISE, 17, Gymnasiarchou Madia St., 82100 Chios, Greece
6
Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Aghia Paraskevi, 15341 Athens, Greece
7
School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Street, Zografou, 15780 Athens, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Morais Simone
Nanomaterials 2021, 11(2), 280; https://doi.org/10.3390/nano11020280
Received: 30 December 2020 / Revised: 16 January 2021 / Accepted: 19 January 2021 / Published: 22 January 2021
(This article belongs to the Special Issue Nanomaterials and Nanotechnology in Wastewater Treatment)
The main scope of this work is to develop nano-carbon-based mixed matrix cellulose acetate membranes (MMMs) for the potential use in both gas and liquid separation processes. For this purpose, a variety of mixed matrix membranes, consisting of cellulose acetate (CA) polymer and carbon nanotubes as additive material were prepared, characterized, and tested. Multi-walled carbon nanotubes (MWCNTs) were used as filler material and diacetone alcohol (DAA) as solvent. The first main objective towards highly efficient composite membranes was the proper preparation of agglomerate-free MWCNTs dispersions. Rotor-stator system (RS) and ultrasonic sonotrode (USS) were used to achieve the nanofillers’ dispersion. In addition, the first results of the application of the three-roll mill (TRM) technology in the filler dispersion achieved were promising. The filler material, MWCNTs, was characterized by scanning electron microscopy (SEM) and liquid nitrogen (LN2) adsorption-desorption isotherms at 77 K. The derivatives CA-based mixed matrix membranes were characterized by tensile strength and water contact angle measurements, impedance spectroscopy, gas permeability/selectivity measurements, and water permeability tests. The studied membranes provide remarkable water permeation properties, 12–109 L/m2/h/bar, and also good separation factors of carbon dioxide and helium separations. Specifically, a separation factor of 87 for 10% He/N2 feed concentration and a selectivity value of 55.4 for 10% CO2/CH4 feed concentration were achieved. View Full-Text
Keywords: cellulose acetate; mixed matrix membranes (MMMs); filler dispersion; ultrasonic sonotrode (USS); rotor-stator system (RS); impedance spectroscopy; CO2 separation cellulose acetate; mixed matrix membranes (MMMs); filler dispersion; ultrasonic sonotrode (USS); rotor-stator system (RS); impedance spectroscopy; CO2 separation
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MDPI and ACS Style

Esser, T.; Wolf, T.; Schubert, T.; Benra, J.; Forero, S.; Maistros, G.; Barbe, S.; Theodorakopoulos, G.V.; Karousos, D.S.; Sapalidis, A.A.; Favvas, E.P. CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method. Nanomaterials 2021, 11, 280. https://doi.org/10.3390/nano11020280

AMA Style

Esser T, Wolf T, Schubert T, Benra J, Forero S, Maistros G, Barbe S, Theodorakopoulos GV, Karousos DS, Sapalidis AA, Favvas EP. CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method. Nanomaterials. 2021; 11(2):280. https://doi.org/10.3390/nano11020280

Chicago/Turabian Style

Esser, Tobias; Wolf, Tobias; Schubert, Tim; Benra, Jan; Forero, Stefan; Maistros, George; Barbe, Stéphan; Theodorakopoulos, George V.; Karousos, Dionysios S.; Sapalidis, Andreas A.; Favvas, Evangelos P. 2021. "CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method" Nanomaterials 11, no. 2: 280. https://doi.org/10.3390/nano11020280

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