Abstract

Covalent Organic Frameworks (COFs) are renowned for their high crystallinity and tailored porosity, yet their intractable powder form and poor processability severely limit practical deployment. While electrospun nanofiber membranes offer a pathway to macro-scale COF composites, they often suffer from isotropic mechanical weakness and lack textile processability. Herein, we report a conjugated electrospinning strategy integrated with in situ solvothermal synthesis to fabricate continuous, weavable, and mechanically robust Polyacrylonitrile@Covalent Organic Framework-H (PAN@COF-H) composite yarns. The resulting yarns feature a unique hierarchical architecture where COF-H crystals uniformly coat the surface of oriented nanofibers. This design endows the material with a high specific surface area (94.9 m2/g) and exceptional tensile strength (10 MPa), representing a significant improvement over conventional random electrospun mats. Benefiting from the intrinsic porosity of COF-H and the hydrophilic nature of the composite, the yarns achieve a 73.76% removal rate for Rhodamine B (RhB) within 4 h. Crucially, the material retains over 33.36% of its adsorption capacity after five consecutive cycles, demonstrating outstanding durability. This study bridges the gap between microscopic COF crystals and macroscopic textile architectures, offering a versatile platform for deployable environmental remediation technologies.

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