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Click chemistry‑induced modification of covalent organic framework/cellulose aerogels for removal of dye and heavy metal ions
Summary:
The authors from the Key Laboratory of Bio-Based Material Science and Technology, Northeast Forestry University, China, developed a novel cellulose-based aerogel with active functional groups, achieving significant adsorption capacities for methylene blue (MB) and heavy metal ions like Hg2+ in the field of water treatment.
Background:
1. To address the problem of water pollution caused by organic dyes and heavy metal ions, previous researchers have explored various adsorbents, achieving certain success. However, there are still challenges in developing highly efficient, selective, and environmentally friendly adsorbents.
2. The authors in this study proposed an innovative method of synthesizing a cellulose-based aerogel by in situ growth of vinyl-functional covalent organic frameworks (COFs) on aminated cellulose nanofibers (ACNFs) and further modifying it via thiol-ene click reactions, obtaining excellent adsorption performance for MB and Hg2+.
Research Content:
1. Synthesis:
The authors synthesized the aerogel by first extracting cellulose nanofibers (CNFs) from poplar wood powder, then functionalizing them with amino groups using AEAPMDS. Subsequently, vinyl-functional COFs were grown in situ on the ACNFs, forming the ACNF/COF aerogel. Further modifications were made by thiol-ene click reactions to introduce carboxyl and thiol groups, resulting in ACNF/COF-COOH and ACNF/COF-SH aerogels.
2. Characterizations:
1) The BET specific surface area of the ACNF/COF aerogel was 367 m²/g, with pore sizes mainly at 2.5 nm.
2) SEM/TEM tests show the particle size of the COFs in the aerogel to be approximately 230 nm.
3) FTIR and XPS analyses confirmed the successful synthesis and modification of the aerogel, with characteristic peaks indicating the presence of functional groups.
3. Application:
The ACNF/COF-COOH aerogel exhibited a maximum adsorption capacity of 563.0 mg/g for MB, while the ACNF/COF-SH aerogel demonstrated high selectivity for heavy metal ion removal, with a mercury ion (Hg2+) distribution coefficient (Kd) of 22,782.0 mL/g.
4. Mechanism:
The adsorption mechanism involves various supramolecular forces such as hydrogen bonding, electrostatic interaction, π–π conjugation, and coordinate bonds between functional groups and pollutants, which contribute to the high adsorption capacities and selectivity.
Outlook:
This research provides a novel and efficient approach to developing cellulose-based aerogels with tailored functional groups for targeted pollutant removal, offering significant potential for sustainable water treatment applications.
Click chemistry‑induced modification of covalent organic framework/cellulose aerogels for removal of dye and heavy metal ions
Authors: Yunfeng Guo, Weihua Gong, Linlin Zhao, Yanxiao Yang, Xiaoqian Zhou, Zefang Xiao, Yanjun Xie, Yonggui Wang
DOI：10.1007/s10570-024-06161-8
Link：https://doi.org/10.1007/s10570-024-06161-8
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