摘要
Hierarchical porous carbon is derived from in situ Al-MOF growth on lignin nanofibers. • Integrated nanofiber networks and Al-containing interfaces promote fluoride electrosorption. • High capacity of 27.48 mg·g −1 and separation factor of 90.7% at 1.2 V. • Superior durability with 93.46% capacitance retention after 5000 cycles and 68.1% adsorption capacity after 20 regeneration cycles. Fluoride contamination has become an increasing environmental concern because of its adverse effects on aquatic ecosystems and human health. Capacitive deionization (CDI) offers an effective approach for fluoride removal; however, the development of electrode materials with efficient ion transport, stable interfacial structures, and high fluoride affinity remains challenging. Herein, a bio-derived Al-containing porous carbon electrode (AMCNF) is fabricated by in situ growth of Al-MOF on lignin nanofibers, followed by carbonization. The optimized AMCNF-4 electrode features an interconnected porous framework with uniformly distributed Al-containing sites, facilitating ion transport and providing abundant fluoride adsorption sites. AMCNF-4 achieves a fluoride electrosorption capacity of 27.48 mg·g −1 with 90.7% removal efficiency, reducing fluoride concentration from 10 to 0.97 mg·L −1 . Moreover, it retains 68.1% of its initial electrosorption capacity after 20 regeneration cycles, demonstrating acceptable cycling stability. The improved electrosorption performance is attributed to the synergistic effect of the lignin-derived porous carbon framework and exposed Al sites, which facilitate ion transport and fluoride adsorption through electrostatic attraction and coordination interactions. This work provides a sustainable strategy for designing MOF-derived bio-carbon hybrid electrodes with tailored interfacial chemistry for efficient capacitive defluorination. Download: Download high-res image (305KB) Download: Download full-size image
危险品化学品经营许可证（带存储）