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
Institute for Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany.
Faculty of Applied Natural Sciences, TH Köln, Kaiser-Wilhelm-Allee, Gebäude E39, 51373 Leverkusen, Germany.
Nanomaterials (Basel). 2021 Jan 22;11(2):280. doi: 10.3390/nano11020280.
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 (LN) 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/m/h/bar, and also good separation factors of carbon dioxide and helium separations. Specifically, a separation factor of 87 for 10% He/N feed concentration and a selectivity value of 55.4 for 10% CO/CH feed concentration were achieved.
这项工作的主要范围是开发基于纳米碳的混合基质醋酸纤维素膜（MMMs），用于气体和液体分离过程的潜在应用。为此，制备、表征并测试了多种由醋酸纤维素（CA）聚合物和作为添加剂材料的碳纳米管组成的混合基质膜。使用多壁碳纳米管（MWCNTs）作为填充材料，二丙酮醇（DAA）作为溶剂。制备高效复合膜的首要主要目标是适当制备无团聚的MWCNTs分散体。使用转子 - 定子系统（RS）和超声换能器（USS）来实现纳米填料的分散。此外，三辊研磨机（TRM）技术在填料分散中的初步应用结果很有前景。通过扫描电子显微镜（SEM）和77 K下的液氮（LN）吸附 - 解吸等温线对填充材料MWCNTs进行了表征。通过拉伸强度和水接触角测量、阻抗谱、气体渗透率/选择性测量以及水渗透率测试对基于CA的混合基质膜衍生物进行了表征。所研究的膜具有显著的透水性能，为12 - 109 L/m/h/bar，并且在二氧化碳和氦气分离方面也具有良好的分离因子。具体而言，对于10% He/N进料浓度，分离因子达到87，对于10% CO/CH进料浓度，选择性值达到55.4。
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