Actinide Ion (Americium-241 and Uranium-232) Interaction with Hybrid Silica–Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels
Abstract
:1. Introduction
2. Results and Discussion
2.1. Xerogel and Nanoparticle Characteristics
2.2. Adsorption Kinetics
2.3. pH Effect on the Actinide Binding Efficiency
2.4. Adsorption Thermodynamics
2.5. Radionuclide Interaction in Seawater
3. Conclusions
- Hybrid silica–hyperbranched poly(ethylene imine) nanoparticles and xerogels present relatively high removal efficiency at pH 4 and pH 7 (>70%) for Am(III) and U(VI).
- Generally, the adsorption process is relatively slow due to very low radionuclide concentrations and is governed by the actinide diffusion from the bulk solution to the composite surface.
- The actinide binding by the NP and XG composites is favored by increasing temperature indicating an endothermic and entropy-driven binding reaction.
- Compared to other adsorbents, which have been investigated regarding the removal of the studied actinide ions, both composites show far higher removal efficiency from laboratory and seawater samples, which is for xerogels almost 90% and for nanoparticles about 80% for uranium and 70% for americium.
- The simple derivatization of NPs and XGs to increase the selectivity towards specific actinides and other metal ions, along with their easy implementation in water treatment technologies, could make these materials attractive candidates for the decontamination of actinide-contaminated waters, including seawaters.
4. Experimental Section
4.1. Synthesis of the Composite Silica–PEI 750,000 Nanoparticles
4.2. Synthesis of the Silica–PEI 750,000 Xerogels
4.3. Adsorption Experiments
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Ioannidis, I.; Pashalidis, I.; Arkas, M. Actinide Ion (Americium-241 and Uranium-232) Interaction with Hybrid Silica–Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels. Gels 2023, 9, 690. https://doi.org/10.3390/gels9090690
Ioannidis I, Pashalidis I, Arkas M. Actinide Ion (Americium-241 and Uranium-232) Interaction with Hybrid Silica–Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels. Gels. 2023; 9(9):690. https://doi.org/10.3390/gels9090690
Chicago/Turabian StyleIoannidis, Ioannis, Ioannis Pashalidis, and Michael Arkas. 2023. "Actinide Ion (Americium-241 and Uranium-232) Interaction with Hybrid Silica–Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels" Gels 9, no. 9: 690. https://doi.org/10.3390/gels9090690