Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent
2018; Wiley; Volume: 8; Issue: 33 Linguagem: Inglês
10.1002/aenm.201802607
ISSN1614-6840
AutoresDong Wang, Jianan Song, Jun Wen, Yihui Yuan, Zhenglian Liu, Sen Lin, Haiyang Wang, Haolun Wang, Shilei Zhao, Xuemei Zhao, Minghao Fang, Ming Lei, Bo Li, Ning Wang, Xiaolin Wang, Hui Wu,
Tópico(s)Nuclear Materials and Properties
ResumoAbstract The oceans contain hundreds of times more uranium than terrestrial ores. Fiber‐based adsorption is considered to be the most promising method to realize the industrialization of uranium extraction from seawater. In this work, a pre‐amidoximation with a blow spinning strategy is developed for mass production of poly(imide dioxime) nanofiber (PIDO NF) adsorbents with many chelating sites, excellent hydrophilicity, 3D porous architecture, and good mechanical properties. The structural evidences from 13 C NMR spectra confirm that the main functional group responsible for the uranyl binding is not “amidoxime” but cyclic “imidedioxime.” The uranium adsorption capacity of the PIDO NF adsorbent reaches 951 mg‐U per g‐Ads in uranium (8 ppm) spiked natural seawater. An average adsorption capacity of 8.7 mg‐U per g‐Ads is obtained after 56 d of exposure in natural seawater via a flow‐through column system. Moreover, up to 98.5% of the adsorbed uranium can be rapidly eluted out and the adsorbent can be regenerated and reused for over eight cycles of adsorption–desorption. This new blow spun PIDO nanofabric shows great potential as a new generation adsorbent for uranium extraction from seawater.
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