Surface-engineered PIM-1 membranes for facile CO2 capture
Chemical Engineering Journal(2023)
摘要
Polymers of intrinsic microporosity (PIMs) are promising candidates for carbon dioxide (CO2) separation and capture from flue gas or natural gas. PIM-1, which has excellent gas permeation properties over the Robeson upper bound (1991), has been widely functionalized to further enhance the CO2 permeability or selectivity. In this work, a simple and readily processive surface modification method has been proposed via hydrolysis of the PIM-1 membrane. The two hydrolysis processes by the acid method, amidation and carboxylation processes, have been conducted to functionalize the surface of PIM-1 membranes forming NA-PIM-1 and CA-PIM-1 membranes. The TGA, FT-IR spectra and NMR results verify that the composition and structure inside the PIM-1 membrane remain unchanged. XPS and NMR spectra demonstrate that the nitrile group at the surface was successfully functionalized with an amine group or carboxyl group. The CO2 permeability and CO2/N2 selectivity of the NA-PIM-1 membrane both increased to 4593.2 Barrer and 28.5, respectively. Another advantage of NA- PIM-1 membranes is the coordination site from introduced nitrogen atoms with zinc ions to form NA-PIM-1-Zn, which could further react with PEI to introduce amine-rich groups on the surface of the PIM-1 membrane. The CO2/N2 selectivity of the NA-PIM-1-Zn-PEI membrane coated with PEI on the surface increases 45.4% compared to the unmodified PIM-1 membranes, with CO2 permeability decreasing only 15.5% compared to the unmodified PIM-1 membrane. The NA-PIM-1 and NA-PIM-1-Zn-PEI membranes both surpass the Robeson upper bound (2008) even under mixed gas feeding, suggesting that surface modification of PIM-1 is a promising approach for CO2 capture from natural gas and flue gas.
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关键词
co2,surface-engineered
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