Porous silica nanosheets in PIM-1 membranes for CO2 separation
Autor: | Sajjad Mohsenpour, Zunmin Guo, Faiz Almansour, Stuart M. Holmes, Peter M. Budd, Patricia Gorgojo |
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Přispěvatelé: | University of Manchester, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Engineering and Physical Sciences Research Council (UK), European Commission, European Research Council, Ministerio de Ciencia, Innovación y Universidades (España) |
Jazyk: | angličtina |
Rok vydání: | 2022 |
Předmět: | |
Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
Popis: | PIM-1-based freestanding mixed matrix membranes (MMMs) and thin film nanocomposites (TFNs) were prepared by incorporating porous silica nanosheets (SN) and exfoliated SN (E-SN) derived from natural vermiculite (Verm) in the PIM-1 polymer matrix. In addition, SN were functionalized by sulfonic acid and amine groups (S-SN and N-SN, respectively) and were also used as fillers for the preparation of MMMs. The gas separation performance was evaluated using CO2/CH4 and CO2/N2 (1:1, v:v) binary gas mixtures. Among freestanding membranes, fresh ones (i.e. tested right after preparation) containing 0.05 wt% functionalized SN and E-SN outperformed the neat PIM-1, surpassing the 2008 Robeson upper bound. At the same filler concentration, fresh MMMs with sulfonic acid-functionalized SN (S-SN) exhibited 40% higher CO2 permeability, 20% higher CO2/N2 selectivity and almost the same CO2/CH4 selectivity as neat PIM-1 membranes. Moreover, after 150 days of aging, these membranes were capable of maintaining up to 68% of their initial CO2 permeability (compared to 37% for neat PIM-1). When prepared as TFN membranes, the incorporation of 0.05 wt% of S-SN led to 35% higher initial CO2 permeance and five times higher CO2 permeance after 28 days. S. Mohsenpour thanks the University of Manchester for funding his Ph.D. studies. P. Gorgojo acknowledges the Spanish Ministry of Economy and Competitiveness and the European Social Fund through the Ramon y Cajal programme (RYC2019-027060-I/AEI/10.13039/501100011033). Stuart M. Holmes thanks the EPSRC grant EP/009050. |
Databáze: | OpenAIRE |
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