Synthesis and Characterisation of ETS-10 Acetate-based Ionic

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Synthesis and Characterisation of ETS-10 Acetate-based Ionic ( synthesis-and-characterisation-ets-10-acetate-based-ionic )

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Membranes 2014, 4, 287-301; doi:10.3390/membranes4020287 membranes Article Synthesis and Characterisation of ETS-10/Acetate-based Ionic Liquid/Chitosan Mixed Matrix Membranes for CO2/N2 Permeation Clara Casado-Coterillo 1,*, María del Mar López-Guerrero 2 and Ángel Irabien 1 1 2 * Author to whom correspondence should be addressed; E-Mail: casadoc@unican.es; Tel.: +34-942-206777. Received: 2 April 2014; in revised form: 19 May 2014 / Accepted: 12 June 2014 / Published: 19 June 2014 Abstract: Mixed matrix membranes (MMMs) were prepared by incorporating organic surfactant-free hydrothermally synthesised ETS-10 and 1-ethyl-3-methylimidazolium acetate ionic liquid (IL) to chitosan (CS) polymer matrix. The membrane material characteristics and permselectivity performance of the two-component membranes were compared with the three-component membrane and the pure CS membrane. The addition of IL increased CO2 solubility of the polymer, and, thus, the CO2 affinity was maintained for the MMMs, which can be correlated with the crystallinity, measured by FT-IR, and void fraction calculations from differences between theoretical and experimental densities. The mechanical resistance was enhanced by the ETS-10 nanoparticles, and flexibility decreased in the two-component ETS-10/CS MMMs, but the flexibility imparted by the IL remained in three-component ETS-10/IL/CS MMMs. The results of this work provide insight into another way of facing the adhesion challenge in MMMs and obtain CO2 selective MMMs from renewable or green chemistry materials. Keywords: mixed matrix membranes; chitosan; microporous titanosilicate ETS-10; 1-ethyl-3-methyl-imidazolium acetate ionic liquid; membrane characterisation Department of Chemical and Biomolecular Engineering, Universidad de Cantabria, Avda. Los Castros s/n, 39005 Santander, Spain; E-Mail: irabienj@unican.es Department of Analytical Chemistry, Faculty of Sciences, Universidad de Málaga, 29071 Málaga, Spain; E-Mail: mmlopez@uma.es ISSN 2077-0375 www.mdpi.com/journal/membranes OPEN ACCESS

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