Covalent organic framework-based porous materials for harmful gas purification

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Covalent organic frameworks (COFs) are novel porous crystalline materials with 2D or 3D networks.
• COFs exhibit attractive physicochemical properties, including high surface area, tunable functionality, low density, and high stability, making them suitable for gas purification.
• Existing reviews on COFs for gas purification are limited, particularly concerning non-CO2 harmful gases.

Purpose of the Study:

• To comprehensively review the recent advancements in the application of COFs for the capture, catalysis, and detection of common harmful gases.
• To summarize design strategies for functional COF materials tailored for specific gas purification applications.
• To identify challenges and propose future research directions for COFs in harmful gas treatment.

Main Methods:

• Systematic literature review of COF applications in gas purification.
• Analysis of COF design strategies, including porosity adjustment and surface functionalization (bottom-up, post-synthetic, blending).
• Discussion of COF performance in capturing, catalyzing, and detecting various harmful gases (CO2, NOx, SO2, H2S, NH3, volatile pollutants).

Main Results:

• COFs demonstrate significant potential in capturing, catalyzing, and detecting a wide range of harmful gases.
• Various design strategies, such as porosity control and surface modification, enhance COF performance for specific gas purification tasks.
• The review covers applications for CO2, NOx, SO2, H2S, NH3, and volatile organic compounds.

Conclusions:

• COFs are highly promising materials for advanced gas purification technologies.
• Further research into COF design and application is crucial for addressing environmental pollution challenges.
• Future directions include optimizing COF synthesis and exploring novel applications in harmful gas treatment.