Effect of Cu-MOFs incorporation on gas separation of Pebax thin film nanocomposite (TFN) membrane
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Effect of Cu-MOFs incorporation on gas separation of Pebax thin film nanocomposite (TFN) membrane Mahdi Fakoori*, Amin Azdarpour*,†, Reza Abedini**, and Bizhan Honarvar* *Department of Chemical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran **Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran (Received 19 April 2020 • Revised 28 June 2020 • Accepted 11 July 2020) AbstractMOF-based membranes, which have appropriate MOF dispersion and suitable interaction, have shown high CO2 permeability and significant CO2/CH4 and CO2/N2 selectivity. In this study, a layer of Pebax was coated on polysulfone (PSF), which this layer incorporated by various content of Cu-MOFs to improve the performance (permeability and CO2/CH4 and CO2/N2 selectivity) of all membranes. Characterization techniques such as SEM, TGA, BET, and gas adsorption verified that Cu-BTC was successfully dispersed into the Pebax matrix. Pure CO2 and CH4 gases permeation experiments were performed to investigate the impact of Cu-MOFs on the gas permeability of prepared MOF-based membranes. The “Pebax” embedded by 15 wt% CuBTC and 15 wt% of NH2-CuBTC over PSF support exhibited higher gas separation performance compared to the pristine one. They demonstrated a CO2 permeability of 228.6 and 258.3 Barrer, respectively, while the blank membrane had a CO2 permeability of 110.6 Barrer. Embedding the NH2-Cu-BTC intensified the interaction between incorporated MOF particles and the polymer phase that led to increase the CO2/CH4 and CO2/N2 selectivity. In addition, the performance of prepared membranes was evaluated at various feed pressures with the range of 2-10 bar. The CO2/CH4 and CO2/N2 separation was enhanced as the feed pressure surged. Keywords: Cu-MOFs, MOF-based Membrane, Gas Separation Performance
very permeable toward specific gas) to overcome this undesirable relationship by using microporous inorganic materials such as covalent organic frameworks (COFs) [16], metal-organic frameworks (MOFs) [17,18], zeolites [19,20], and silica [21,22] in polymeric matrix to improve both selectivity and permeability. MOFs are a fascinating kind of inorganic porous materials that are synthesized by association of organic linker and metal clusters to make a framework structure. Multifunctionality, extraordinary high thermal stability, low density, high surface area, and tunable pore size have made them promising candidates in gas separation [23-27]. The combination of the advantages of inorganic fillers and polymeric phase can reduce the formation of a number of defects, including poor dispersion, phase separation, and particle agglomeration [28]. Recently, many studies have been developed in terms of fabrication of thin film nanocomposite (TFN), including a highly permeable porous substrate and a thin selective layer for gas separation applications. High selectivity along with high permeability value is the main feature of TFNs, which mak
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