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Membranes 2014, 4 298 4. Conclusions Mixed matrix membranes (MMMs) were prepared by adding a highly absorbing non-toxic ionic liquid, 1-ethyl-3-methylimidazolium acetate ([emim][Ac], IL), and a microporous titanosilicate ETS-10 nanoparticles to the continuous matrix of biopolymer chitosan (CS), and neutralising in NaOH solution to prepare the materials for CO2 affinity. The membrane material characteristics and permselectivity performance of the two-component membranes was compared with the three-component membrane and the pure CS membrane. The CO2 solubility increased upon addition of the IL and ETS-10 adsorbent. The mechanical strength was enhanced by the addition of ETS-10 particles, while the IL imparted flexibility to the membrane. The porosity and free volume were estimated from measured and theoretical densities. The void fraction of the ETS-10/IL/CS MMM was the largest obtained in this work, attributed to the interaction between IL, the polymer, and the porous ETS-10 particles. FT-IR spectra revealed a good interaction between the components in the MMMs, and a means of measuring the crystallinity to account for the real permeation area of the membrane, which is usually the amorphous part. These parameters (pore size, particle size and shape, interfacial adhesion, free volume, crystallinity) were correlated with the gas transport performance. This was evaluated by CO2 and N2 single gas permeation experiments. The selectivity of the three-component ETS-10/IL/CS MMMs was six times higher than pure CS membrane, showing in general a positive trend towards the attractive region of Robeson’s upper bound. Acknowledgments The authors gratefully acknowledge the financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) and the CCEI-University of Cantabria for the Ramón y Cajal programme (RYC-2011-08550) and MINECO for the project CTQ2012-31229. Joaquín Coronas (Universidad de Zaragoza) is also gratefully acknowledged for the use of DSC equipment and fruitful discussions. Author Contributions The experimental and theoretical part of this work was conducted by Clara Casado-Coterillo, who also prepared the draft of the article. Ángel Irabien was the head of the Sosprocan/DePro research group at the Universidad de Cantabria were the work was carried out. María del Mar López-Guerrero obtained and interpreted the FTIR spectra of the membrane materials at the Universidad de Málaga. All authors reviewed the several drafts of the manuscript. Conflicts of Interest The authors declare no conflict of interest. References 1. Favre, E. Carbon dioxide recovery from post-combustion processes: Can gas permeation membranes compete with absorption? J. Membr. Sci. 2007, 294, 50–59.PDF Image | Synthesis and Characterisation of ETS-10 Acetate-based Ionic
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