[Spherical amino-functionalized covalent organic frameworks: Synthesis and adsorption performance toward
Jun-Bin Ye1, Jia-Wei Liu1, An-Qi Cui1
1School of Environmental Science & Engineering, Guangzhou University, Guangzhou 510006, China.
Se Pu = Chinese Journal of Chromatography
|June 1, 2023
Summary
New spherical amino-functionalized covalent organic frameworks (COF-NH2) effectively remove perfluorinated compounds (PFCs) from water. These reusable COF-NH2 materials offer high adsorption efficiency for detecting trace PFCs in complex environmental samples.
Area of Science:
- Materials Science
- Environmental Chemistry
- Analytical Chemistry
Context:
- Perfluorinated compounds (PFCs) are persistent organic pollutants with widespread industrial use.
- Environmental discharge of PFCs poses significant risks to ecosystems and human health.
- Traditional adsorbents for PFCs often exhibit limitations in selectivity, diffusion, and reusability.
Purpose:
- To develop and fabricate novel spherical amino-functionalized covalent organic frameworks (COF-NH2).
- To evaluate the efficiency of COF-NH2 for the extraction and removal of PFCs from aqueous solutions.
- To investigate the adsorption mechanism, kinetics, and reusability of the synthesized COF-NH2 materials.
Summary:
- Spherical amino-functionalized COFs (COF-NH2) were synthesized using a two-step method involving vinyl COF and a thiol-alkenyl click reaction.
- The COF-NH2 materials demonstrated excellent dispersion in water, high thermal stability, large surface area, and pore volume.
- Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models, with high extraction efficiencies (91.76%-98.59%) for various PFCs in real water samples.
- The adsorption mechanism is attributed to synergistic hydrogen bonding and hydrophobic interactions.
Impact:
- The developed COF-NH2 microspheres show promise as effective solid-phase extraction materials for trace PFC detection.
- This advancement contributes to improved environmental monitoring and remediation strategies for PFC pollution.
- The study highlights the potential of functionalized COFs in addressing challenges in environmental pollutant removal and analysis.
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