Fluorinated amino covalent organic frameworks for efficient adsorption of per- and polyfluoroalkyl substances in
Fanke Tong1, Ruitong Zhang2, Deyan Li2
1State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province, 810016, China; School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Abstract:
Per- and polyfluoroalkyl substances (PFAS) have been classified as emerging pollutants requiring global control, and the development of highly efficient adsorbents is a key technological challenge hindering the effective treatment of PFAS. In this study, we prepared a novel fluorinated amino covalent organic framework (COF-FS-NH2) via multimonomer hybrid synthesis and post-synthesis modification. The kinetic data of PFAS adsorption on COF-FS-NH2 were well fitted using the pseudo-second-order model. Using the Langmuir model, the maximum adsorption capacities of COF-FS-NH2 for perfluorooctanoic acid (PFOA), perfluoro-2,5-dimethyl-3,6-dioxanonanoic acid (HFPO-TA), perfluoro-2,5-dimethyl-3,6-dioxaheptanoic acid (C7 HFPO-TA), and perfluoro(2-methyl-3-oxahexanoic) acid (GenX) were found to be 0.331, 0.289, 0.319, and 0.210 mmol/g, respectively. PFAS adsorption mainly relied on the electrostatic interaction between the amino group of COF-FS-NH2 and the anionic group of PFAS as well as the van der Waals forces. Compared with the conventional activated carbon and resin materials, COF-FS-NH2 exhibited high selectivity and adsorption capacity for PFAS, with high removal percentage (>80%) for the four PFAS at environmental concentration (10 μg/L). This study demonstrates that COF-FS-NH2 has great potential for the efficient removal of PFAS from water, providing a new material strategy for practical water remediation.
More Related Videos
08:42Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
Published on: July 10, 2017
06:45Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
Published on: March 8, 2024
Related Concept Videos
Amino acids
Covalent Bonds
Covalently Linked Protein Regulators
These groups modify specific amino acids in a protein....
Network Covalent Solids
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Accessory Organs
Covalent Bonding and Lewis Structures
