| Autor: |
Jie Wang, Zuji Xie, Shuai Tang, Ruoqian Zhang, Yinjiang Liu, Yihui Yuan, Ning Wang, Anping Gu, Hui Wang, Mengwei Chen, Tao Liu, Xi Guo |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Chemical Engineering Journal. 430:133182 |
| ISSN: |
1385-8947 |
| DOI: |
10.1016/j.cej.2021.133182 |
| Popis: |
The efficient development of selective adsorbents for uranium extraction from seawater is necessary for their potential application in nuclear power generation. The amidoxime-based adsorbents have been recognized as the potential candidates, whereas they still suffer from a much higher affinity towards V(V) present in the seawater over U(VI), leading to the extremely limited commercial use. In this work, we develop a novel mussel-inspired photothermal polyamidoxime (PAO) hydrogel adsorbent, in which polydopamine (PDA) chains are linked to PAO (PDA-PAO) via Michael addition. Dual-crosslinked Fe@PDA-PAO hydrogel structure is constructed by noncovalent bonds between the catechol of PDA chains (e.g. π-π stacking and hydrogen bonds) as well as ionic coordination of Fe3+. PDA contributes to the improved hydrophilicity and high photothermal conversion efficiency. As a result, after immersing in real seawater for 6 weeks, light-irradiated Fe@PDA-PAO hydrogel delivers high uranium sorption capacity (12.67 mg-U/g-Ads) together with high U/V mass ratios (1.17), which are superior to currently available hydrogel adsorbents. Meanwhile, Fe3+ coordination endows Fe@PDA-PAO hydrogel with excellent tensile strength and self-recovery ability, which are of great significance to withstand the harsh conditions of ocean environment for practical applications. The results presented here reveal that Fe@PDA-PAO hydrogel holds tremendous potential for practical applications in the uranium-selective extraction from seawater. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect