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 ¹³C 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.

中文翻译：

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大量生产的全A氨基肟化纳米纤维吸附剂可显着提高海水中铀的萃取率

海洋中的铀比陆地矿石多数百倍。基于纤维的吸附被认为是实现从海水中提取铀的工业化的最有前途的方法。在这项工作中，开发了一种具有吹塑纺丝策略的预氨基氧化方法，用于批量生产具有许多螯合位点，优异的亲水性，3D多孔结构和良好的机械性能的聚（酰亚胺二肟）纳米纤维（PIDO NF）吸附剂。来自¹³的结构证据1 H NMR谱证实，负责铀酰结合的主要官能团不是“ ami肟”，而是环状“酰亚胺二肟”。在掺有铀（8 ppm）的天然海水中，PIDO NF吸附剂的铀吸附容量达到951 mg-U / g-Ads。通过流通柱系统在天然海水中暴露56天后，平均吸附量为8.7 mg-U / g-Ads。而且，高达98.5％的吸附铀可以被快速洗脱出来，并且吸附剂可以再生并重复使用八个以上的吸附-解吸循环。这种新型的吹纺PIDO纳米织物作为用于从海水中提取铀的新一代吸附剂显示出巨大的潜力。