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Radionuclides and highly toxic organophosphates are typically deadly threats. Materials with radionuclide adsorption and organophosphate degradation provide dual protection
Recently, Prof. Dongzhi Yang from Beijing University of Chemical Technology published an article entitled “Nitrogen-rich and core-sheath polyamide/polyethyleneimine@Zr-MOF for iodine adsorption and nerve agent simulant degradation” in the Journal of Hazardous Materials. Nitrogen-rich and core-sheath polyamide/polyethyleneimine@Zr-MOF for iodine adsorption and nerve agent simulant degradation”, which reports a novel nitrogen-rich and core-sheath polyamide/polyethyleneimine@Zr-MOF material for iodine adsorption and nerve agent simulant degradation. The superior performance of this material has potential for a wide range of applications in the fields of environmental protection and security.
The main point of this paper
1. This study developed a nitrogen-enriched core-shell PA/PEI@(Zr-MOF) Nanofiber Membrane, aiming at both efficient adsorption of iodine and degradation of nerve agent simulants.
2. The Nanofiber Membrane prepared by electrospinning has a unique core-shell structure and exhibits excellent physicochemical properties.
3. It was shown that the Nanofiber Membrane had an adsorption capacity of up to 1.56 mmol/g of iodine and could achieve a 99% removal rate within 30 minutes.
4. In addition, the Nanofiber Membrane showed good catalytic activity in the degradation of nerve agent mimics (e.g., DMNP), with a degradation rate of more than 90%.
Preparation process of core-shell PA/PEI@(Zr-MOF) composite Nanofiber Membrane:
1.Electrospinning:
Firstly, a uniform solution containing PA and PEI was prepared and continuous PA/PEI fiber membrane was obtained by electrospinning technology.
2.Chemical cross-linking:
After electrospinning, the obtained PA/PEI fiber membrane undergoes a chemical cross-linking reaction. This step is carried out by exposing the membrane to steam in a 50 wt% glutaraldehyde solution for a duration of 24 hours. This step enhanced the mechanical stability and structural integrity of the fibers.
3. In situ solvothermal growth:
Zirconium metal-organic frameworks (Zr-MOF, UiO-66-NH) were grown on the surface of the electrospun fiber membranes by in situ solvothermal method. This process is carried out by reacting zirconium chloride (ZrCl4) with the ligand 2-aminoterephthalic acid (H BDC-NH) under solvent-thermal conditions, which results in the formation of a sheath layer of Zr-MOF around the core fibers.
1. Increase surface area:
The outer layer of Zr-MOF provides a large area of active sites, which aids in the adsorption of iodine and other contaminants. This structural design allows for more efficient interactions between the membrane and the target substance.
2.Synergistic effect:
The combination of the nitrogen-enriched core (polyamide and polyethyleneimine) with the Zr-MOF sheath creates a synergistic effect. The amino groups in the core can form complexes with iodine, while Zr-MOF enhances the overall adsorption capacity and catalytic activity.
3. Improved mechanical stability:
The core-shell structure contributes to the mechanical integrity of the membrane, making it more durable and able to maintain its performance under various environmental conditions.
4.Facilitates transport:
The different layers allow for better transport of ions and molecules, enhancing the kinetics of the adsorption and degradation processes, which accelerates the rate of pollutant removal.
5. Dual functionality:
The core-shell structure gives the composite membrane dual functionality to adsorb radioactive iodine and catalyze the degradation of organophosphorus compounds, thus demonstrating high efficiency in environmental remediation and safety applications.
Originallink: https://doi.org/10.1016/j.jhazmat.2024.135713
