AI Article Synopsis
- - The study focuses on creating a new sorbent to efficiently recover cesium (Cs(I)) and strontium (Sr(II)) from water, which is especially important for the nuclear industry despite these metals not being particularly hazardous.
- - The sorbent is developed by modifying hydrogel beads made from algae and polyethyleneimine through a process called phosphonation, and its effectiveness is validated through various analytical methods and tests under different conditions.
- - Results indicate that the modified sorbent has a higher capacity for absorbing Sr(II) and performs better than unmodified materials in terms of stability, selectivity against competing metals, and effectiveness in complex solutions like seawater, suggesting it could be useful for treating radioactive wastewater.
Article Abstract
Although Cs(I) and Sr(II) are not strategic and hazardous metal ions, their recovery from aqueous solutions is of great concern for the nuclear industry. The objective of this work consists of designing a new sorbent for the simultaneous recovery of these metals with selectivity against other metals. The strategy is based on the functionalization of algal/polyethyleneimine hydrogel beads by phosphonation. The materials are characterized by textural, thermo-degradation, FTIR, elemental, titration, and SEM-EDX analyses to confirm the chemical modification. To evaluate the validity of this modification, the sorption of Cs(I) and Sr(II) is compared with pristine support under different operating conditions: the pH effect, kinetics, and isotherms are investigated in mono-component and binary solutions, before investigating the selectivity (against competitor metals) and the possibility to reuse the sorbent. The functionalized sorbent shows a preference for Sr(II), enhanced sorption capacities, a higher stability at recycling, and greater selectivity against alkali, alkaline-earth, and heavy metal ions. Finally, the sorption properties are compared for Cs(I) and Sr(II) removal in a complex solution (seawater sample). The combination of these results confirms the superiority of phosphonated sorbent over pristine support with promising performances to be further evaluated with effluents containing radionuclides.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9957171 | PMC |
| http://dx.doi.org/10.3390/gels9020152 | DOI Listing |
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