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Pebax Mixed-Matrix Membrane with Highly Dispersed [email protected] to Enhance CO2/N2 Separation

Yahui Zhang, Yuping Tong, Xinyu Li, Shoujie Guo, Hailong Zhang, Xi Chen, Kun Cai, Linghe Cheng,
Published: 13 July 2021

Abstract: In this work, zeolitic imidazolate frameworks (ZIF-8) and carboxylated carbon nanotubes (CNTs) were compounded to prepare a kebab-like one-dimensional linear composite, [email protected] The mixed-matrix membrane (MMM) for separating carbon dioxide is prepared by embedding it into the polymer matrix Pebax-1657. The results indicated the successful synthesis of the [email protected] composite. The combination of ZIF-8 and carboxylated CNTs avoided the aggregation of ZIF-8 in the polymer, increased the free volume of the MMM, and enhanced the CO2 adsorption performance and CO2/N2 separation performance. In addition, the interaction between CNTs and ZIF-8 provided a fast transport channel for CO2 molecules and improved the mechanical properties of the MMM. The 5 wt % [email protected] MMM showed the best separation performance with a CO2 permeability of 225.5 Barrer and a CO2/N2 selectivity of 48.9, which exceeded the Robeson upper limit in 2008. The combination of high permeability and selectivity made Pebax/[email protected] MMMs promising for industrial CO2 separation applications.
Keywords: carbon nanotubes / ZIF / permeability / CO2/N2 / email / MMM / matrix / Pebax / Mixed / carboxylated

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