High‐Connectivity 3D Covalent Organic Frameworks with pdp Net for Efficient C 2 H 2 /CO 2 Separation
Year: 2025
Type: article
Abstract: High‐connectivity 3D covalent organic frameworks (COFs) have garnered significant attention due to their structural complexity, stability, and potential for functional applications. However, the synthesis of 3D COFs using mixed high‐nodal building units remains a substantial challenge. In this work, we introduce two novel 3D COFs, JUC‐661 and JUC‐662, which are constructed using a combination of D 2h ‐symmetric 8‐nodal and D 3h ‐symmetric 6‐nodal building blocks. These COFs feature an unprecedented [8+6]‐c pdp net with rare mesoporous polyhedral cages (~3.9 nm). Remarkably, JUC‐661 and JUC‐662 exhibit outstanding separation capabilities, achieving adsorption selectivities of 4.3 and 5.9, respectively, for C 2 H 2 /CO 2 (1/1, v/v) mixtures. Dynamic breakthrough experiments confirm their excellent separation capability, maintaining this performance even under conditions of 100 % humidity. Monte Carlo simulations and DFT calculations indicate that the exceptional adsorption performance is attributed to the well‐defined pore cavities of the COFs, with fluorination of the building unit further enhancing C 2 H 2 selectivity through improved electrostatic and host–guest interactions. This study expands the structural diversity of COFs and highlights their potential for low‐energy separation processes.
Institutions: Jilin University, State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, National University of Singapore, Chinese Academy of Sciences, Qingdao Institute of Bioenergy and Bioprocess Technology, Centre National de la Recherche Scientifique, École Nationale Supérieure d'Ingénieurs de Caen, Laboratoire Catalyse et Spectrochimie, Université de Caen Normandie
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: National Natural Science Foundation of China, China Postdoctoral Science Foundation, Higher Education Discipline Innovation Project, National Key Research and Development Program of China, Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center)
OpenAlex ID: W4407709065