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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

  • The main scope of this work is to develop nano-carbon-based mixed matrix celluloseacetate membranes (MMMs) for the potential use in both gas and liquid separation processes. Forthis purpose, a variety of mixed matrix membranes, consisting of cellulose acetate (CA) polymerand carbon nanotubes as additive material were prepared, characterized, and tested. Multi-walledcarbon 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 preparationof 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 thethree-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 werecharacterized by tensile strength and water contact angle measurements, impedance spectroscopy,gas permeability/selectivity measurements, and water permeability tests. The studied membranesprovide remarkable water permeation properties, 12–109 L/m2/h/bar, and also good separationfactors of carbon dioxide and helium separations. Specifically, a separation factor of 87 for 10%He/N2feed concentration and a selectivity value of 55.4 for 10% CO2/CH4feed concentrationwere achieved.

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Verfasserangaben:Tobias Esser, Tobias Wolf, Tim Schubert, Jan Benra, Stefan Forero, George Maistros, Stéphan Barbe, George V. Theodorakopoulos, Dionysios S. Karousos, Andreas A. Sapalidis, Evangelos P. Favvas
Titel des übergeordneten Werkes (Englisch):Nanomaterials
Jahr der Fertigstellung:2021
Dokumentart:Wissenschaftlicher Artikel
Datum des Hochladens:07.05.2021
Freies Schlagwort / Tag:CO<sub>2</sub> separation; Cellulose acetate; Filler dispersion; Impedance spectroscopy; Mixed matrix membranes (MMMs); Rotor-stator system (RS); Ultrasonic sonotrode (USS)
Ausgabe / Heft:2
Fakultäten und Zentrale Einrichtungen:Anlagen, Energie- und Maschinensysteme (F09) / Fakultät 09 / Institut Anlagen und Verfahrenstechnik
DDC-Sachgruppen:500 Naturwissenschaften und Mathematik
Open Access:Open Access
Lizenz (Deutsch):License LogoCreative Commons - CC BY - Namensnennung 4.0 International