Self-separation of the adsorbent after recovery of rare-earth metals: Designing a novel non-wettable polymer
[Display omitted] •A novel adsorbent was developed for self-separation from batch solution.•La, Ce, Dy, Pr, Nd, and Yb ions were successfully recycled by new polymer.•Adsorption of Yb ions showed the highest adsorption of 191.87 mg.g−1.•The adsorbent floated on water surface within 30 min after fini...
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Veröffentlicht in: | Separation and purification technology 2021-03, Vol.259, p.118152, Article 118152 |
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Sprache: | eng |
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•A novel adsorbent was developed for self-separation from batch solution.•La, Ce, Dy, Pr, Nd, and Yb ions were successfully recycled by new polymer.•Adsorption of Yb ions showed the highest adsorption of 191.87 mg.g−1.•The adsorbent floated on water surface within 30 min after finishing extraction.•The reusability test showed that the performance are reserved even after 10 cycles.
In solid phase extraction method, the adsorbent separation is very challenging and is one of the limiting factors for using batch process. As a solution to this problem, a self-floating (SF) adsorbent with simultaneous separation from water is developed in this study. The adsorbent has a very high performance for extracting and recovery of the rare-earth element (REEs), especially Yb3+, which has not been reported by other organic adsorbents, so far. The designed adsorbent is very low cost and can be easily prepared by using alkyl ketene dimer (AKD) as a commonly used sizing agent in pulp and paper industry. The designed polymer was used to remove La3+, Ce3+, Pr3+, Nd3+, Dy3+, and Yb3+ from aqueous solutions. The adsorption of the ions showed that REEs with smaller ionic radii have more tendencies towards the AKD-based vinylogous amide-diglycolamic acids self-floating (AVD-SF) polymer with the highest adsorption of 191.87 mg.g−1 for Yb3+ ions at pH = 5.5. The adsorption isotherm of Yb3+ ions fitted with Freundlich model and the kinetics isotherm fitting confirmed the pseudo-second order model. The SF adsorbent was easily separated from water within 30 min. The reusability test showed that both the performance and structure are reserved after 10 cycles. |
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ISSN: | 1383-5866 1873-3794 |
DOI: | 10.1016/j.seppur.2020.118152 |