Covalent Organic Frameworks for CO₂ Capture

TLDR

Covalent organic frameworks (COFs) are emerging porous crystalline materials that show great promise for CO₂ capture to mitigate greenhouse gas emissions. The review surveys the CO₂ problem, summarizes existing capture materials, introduces COFs, and examines experimental capture with diverse COF chemistries alongside computational simulations of their porous structures. Analyses of COF stability, low- and high-pressure uptake, selectivity, breakthrough performance, and capture conditions demonstrate recent advances and inform future strategies for CO₂ capture.

Abstract

As an emerging class of porous crystalline materials, covalent organic frameworks (COFs) are excellent candidates for various applications. In particular, they can serve as ideal platforms for capturing CO2 to mitigate the dilemma caused by the greenhouse effect. Recent research achievements using COFs for CO2 capture are highlighted. A background overview is provided, consisting of a brief statement on the current CO2 issue, a summary of representative materials utilized for CO2 capture, and an introduction to COFs. Research progresses on: i) experimental CO2 capture using different COFs synthesized based on different covalent bond formations, and ii) computational simulation results of such porous materials on CO2 capture are summarized. Based on these experimental and theoretical studies, careful analyses and discussions in terms of the COF stability, low- and high-pressure CO2 uptake, CO2 selectivity, breakthrough performance, and CO2 capture conditions are provided. Finally, a perspective and conclusion section of COFs for CO2 capture is presented. Recent advancements in the field are highlighted and the strategies and principals involved are discussed.