Covalent organic framework-based porous materials for harmful gas purification

• Published in: Chemosphere (Oxford) 2022-03, Vol.291 (Pt 1), p.132795-132795, Article 132795
• Main Authors: Huang, Yan, Hao, Xiaoqian, Ma, Shuanglong, Wang, Rui, Wang, Yazhou
• Format: Article
• Language: English
• Subjects: Adsorption; Catalysis; Covalent organic frameworks; Environmental Pollutants; Functional materials; Gases; Harmful gas; Metal-Organic Frameworks; Porosity
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2021.132795

Covalent organic frameworks (COFs) with 2D or 3D networks are a class of novel porous crystalline materials, and have attracted more and more attention in the field of gas purification owing to their attractive physicochemical properties, such as high surface area, adjustable functionality and structure, low density, and high stability. However, few systematic reviews about the application statuses of COFs in gas purification are available, especially about non-CO2 harmful gases. In this review, the recent progress of COFs about the capture, catalysis, and detection of common harmful gases (such as CO2, NOx, SO2, H2S, NH3 and volatile pollutants) were comprehensively discussed. The design strategies of COF functional materials from porosity adjustment to surface functionalization (including bottom-up approach, post-synthetic approach, and blending with other materials) for certain application were summarized in detail. Furthermore, the faced challenges and future research directions of COFs in the harmful gas treatment were clearly proposed to inspire the development of COFs. [Display omitted] •Remarkable advantages of COFs as porous materials are reviewed.•Various functionalization strategies of COFs are summarized.•Recent studies of COFs in harmful gas purification are discussed.•For certain gas, adsorption/catalysis/detection characteristics are studied.•Faced challenges and future research directions are proposed.