An economical and highly uranium extraction from seawater remains a crucial task for energy sources and environmental safety. Aiming for improving the mass transfer rate of uranium from seawater, a new synthetic strategy was adopted to synthesize two-dimensional-open channel microporous bioadsorbent for uranium extraction from seawater. Herein, a vapor phase modification approach was adopted to graft divinylbenzene (DVB), and polyacrylonitrile (AN) onto the surfaces of microporous frameworks via a free radical polymerization method. The postsynthetic functionalization was carried out by hydrothermal process, where amidoxime groups are structure-directing agents to trap uranium. Furthermore, amidoxime groups not only enhanced hydrophilicity but also adjusts adsorbents pK_a. AO-Fc faces minimum interference of competing ions and achieves a high uranium adsorption capacity of 8.57 ± 0.02 and 409 ± 1 mg/g in seawater and simulated solution. Despite its stable structure, AO-Fc exhibits a long life span and negligible weight loss revealed AO-Fc could be applied as a potential adsorbent for radionuclides.

中文翻译：

---

用于铀分离的二维开放通道生物吸附剂的新型制备和气相改性

从海水中经济、高效地提取铀仍然是能源和环境安全的关键任务。为提高海水提铀的传质速率，采用新的合成策略合成二维明渠微孔海水提铀生物吸附剂。本文采用气相改性方法，通过自由基聚合方法将二乙烯基苯（DVB）和聚丙烯腈（AN）接枝到微孔骨架表面。合成后功能化是通过水热过程进行的，其中偕胺肟基团是捕获铀的结构导向剂。此外，偕胺肟基团不仅增强了亲水性，而且还调节了吸附剂的 p K _a. AO-Fc 对竞争离子的干扰最小，在海水和模拟溶液中实现了 8.57 ± 0.02 和 409 ± 1 mg/g 的高铀吸附能力。尽管结构稳定，但 AO-Fc 具有较长的使用寿命和可忽略的重量损失，这表明 AO-Fc 可用作放射性核素的潜在吸附剂。