Sandwich-structured electric polarization device with molecularly imprinted fibrous mat for carbon dioxide adsorption and desorption with frequency

Abstract

Highly selective molecularly imprinted poly(N,N-dimethyl aminoethyl methacrylate) (PDMAEMA) (MIPs) for CO₂ capture were coated on Nylon-6 fibrous membrane (Nfm) to form a core/shell structured Nfm/MIP, creating CO₂-philic, tertiary amide-decorated cavities on the membranes led to a high affinity to CO₂. Electric polarization (EP) induces the separation of positive charge and negative charges in the MIP layers. The Nfm/MIP was placed in between two steel meshes to create an alternating electric field during the CO₂ dynamic adsorption. In the absence of EP, the maximum adsorption capacity of CO₂ on the Nfm/MIP was 1.37 mmol/g at room temperature, while the maximum adsorption capacity reached to 1.97 mmol/g in the presence of EP at 450 kHz and 26 V. The maximum adsorption capacity reduced from 1.97 mmol/g to 0.28 mmol/g by switching frequency from 450 to 1000 kHz. The Nfm containing MIP layer is reused up to 15 times under polarization switching frequencies between 450 and 1000 kHz. As a result, frequency of EP can manipulate the adsorption behavior of CO₂, enabling the improvement of CO₂ adsorption and the reuse of Nfm/MIP. This proposed platform introduces a novel methodology utilizing EP with Nfm/MIP for development of high-speed CO₂ capture and release techniques.