Dynamic covalent assembly of hierarchical COF hollow fibers for selective dye remediation
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作者
Chen, Huiling; Yang, Xiubei; Yang, Guiping; Mu, Yuhe; Yu, Chengbing; Zhang, Wei; Zeng, Gaofeng
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刊物名称
DESALINATION
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年、卷、文献号
2025, ,
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关键词
Chen, Huiling; Yang, Xiubei; Yang, Guiping; Mu, Yuhe; Yu, Chengbing; Zhang, Wei; Zeng, Gaofeng
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摘要
The remediation of toxic dye pollutants via covalent organic frameworks (COFs) presents a promising yet challenging strategy for sustainable water purification, as conventional powdered COFs face critical limitations in recyclability and secondary contamination risks. Herein, we introduce a paradigm-shifting approach combining template-assisted electrospinning with room-temperature dynamic covalent chemistry to fabricate hierarchically porous TAPT-TFPT COF hollow fibers, which address these bottlenecks. The synthesized fibers exhibit crystallographically ordered 2.2 nm pores, a high surface area (1402 m2 g- 1), and reliable chemical/ thermal stability. These structural merits translate to unprecedented Congo red (CR) adsorption performance with a maximum capacity of 3670 mg g- 1 (3-15 times higher than state-of-the-art COFs), size-selective removal efficiency, and comprehensive adsorption metrics including rapid kinetics (95 % removal in 6 h), pH adaptability (50-99 % efficiency across pH 2-12), and cyclic stability (90 % retention after 5 cycles). Mechanistic analyses reveal chemisorption-dominated Langmuir monolayer adsorption governed by pseudo-second-order kinetics, with molecular recognition driven by synergistic pore-size matching, multivalent hydrogen bonding, and it-it interactions. This work establishes an ambient aqueous synthesis platform for macroscopic COF architectures while redefining performance benchmarks for industrial-scale water treatment technologies.
