Engineering the Pore Structure and Functionality of Ionic Porous Polymers for Separating Acetylene over Carbon Dioxide

Abstract

Precise engineering of organic porous polymers to realize the selective separation of structurally similar gases presents a great challenge. In this study, a new class of ionic porous polymers P(Ph3Im-Br-nDVB) with a high ionic density and microporous surface area are constructed through a facile copolymerization strategy, providing an efficient path to rational control over pore structure and functionality. The first example of ionic porous organic polymers is reported to address the challenge of discriminating the subtle difference of C 2 H 2 and CO 2 , which have almost identical molecular sizes and similar physicochemical properties, which achieve the highest C 2 H 2 / CO 2 selectivity (17.9) among porous organic polymers. These ionic porous polymers exhibit high stability and excellent dynamic breakthrough performance for binary C 2 H 2 /CO 2 mixtures, indicating their practical feasibility. Modeling studies reveal that anions are the specific binding sites for preferential C 2 H 2 capture because of Br − •••HCCH interactions. This study not only demonstrates an efficient strategy to build novel ionic porous polymers integrating abundant micropores and ionic sites but also sheds some light on the development of functionalized materials for the separation of structurally similar gas molecules.

Rational design of hyper‐crosslinked polymers for biomedical applications

“…Over the past decade, there has been significant development in the field of porous organic polymers (POPs), [1][2][3][4] which includes hyper-crosslinked polymers (HCPs), 5,6 polymers of intrinsic microporosity (PIMs), 7,8 covalent organic frameworks (COFs), [9][10][11] conjugated microporous polymers (CMPs), [12][13][14] covalent triazine frameworks (CTFs), 15,16 and porous aromatic frameworks (PAFs). 17,18 These POPs have shown potential in various applications such as energy storage, 19,20 catalysis, 21,22 gas separation, 23,24 sensing, 25 and drug delivery 26,27 due to their advanced properties resulting from the combination of different porous structures and types of polymers. The structures of POPs can be systematically controlled to have different morphologies including solid particles, 28,29 hollow spheres, 30,31 fibers, 32,33 nanosheets, 34 and monoliths.…”

Ionic liquids membranes for liquid separation: status and challenges

“…During the last decade, ILMs have been reported to be used in the fields of gas separation (carbon capture, utilization, and storage, CCUS for example), water treatment, resources recovery, fuel cells, solar cells, electrochemical devices, etc. 31–38 (Fig. 1).…”

Emerging porous materials for carbon dioxide adsorptive capture: progress and challenges

“…8 Emerging advanced porous materials, such as zeolites, porous organic polymers (POPs) and metal-organic frameworks (MOFs) with structural diversity and abundant porosity, provide promise for addressing the challenges of CO 2 capture. [9][10][11] CO 2 adsorption performance is mainly governed by preferential interactions, molecular-sieving and dynamic difference or their combinations. Regulation of the precise pore microenvironment of porous materials gives full play to their role in CO 2 capture from different sources.…”