Biofouling is a major obstacle to the efficient extraction of uranium from seawater due to the numerous marine microorganisms in the ocean. Herein, we report a novel amidoxime (AO) crystalline covalent organic framework (BD-TN-AO) by Knoevenagel condensation reaction of 2,2′,2″-(benzene-1,3,5-triyl)triacetonitrile (TN) and 4,4′-(buta-1,3-diyne-1,4-diyl)dibenzaldehyde (BD) that is highly conjugated and possesses excellent photocatalytic activity. The excellent photocatalytic activity endows the BD-TN-AO high anti-biofouling activity by producing biotoxic reactive oxygen species (ROS) and photogenerated electrons to efficiently reduce the loaded U(VI) to insoluble U(IV). Meanwhile, the surface-positive electric field has strong electrostatic attraction to the negative [UO₂(CO₃)₃]⁴⁻ in seawater, which can significantly enhance the extraction capacity of uranium. Benefiting from these outstanding photoinduced effects of BD-TN-AO, the adsorbent exhibits a high uranium adsorption capacity of 5.9 mg g⁻¹ under simulated sunlight irradiation in microorganism-containing natural seawater, which is 1.48 times the adsorption capacity in darkness.

由于海洋中存在多种海洋微生物，生物污染是从海水中有效提取铀的主要障碍。本文中，我们通过2,2'，2''-（苯-1,3,5-三基）三乙腈（TN）的Knoevenagel缩合反应报告了一种新型的mid胺肟（AO）晶体共价有机骨架（BD-TN-AO） 4,4'-（buta-1,3-diyne-1,4-diyl）dibenzaldehyde（BD）高度共轭并具有出色的光催化活性。优异的光催化活性通过产生生物毒性的活性氧（ROS）和光生电子，有效地将负载的U（VI）还原为不溶性U（IV），从而使BD-TN-AO具有很高的抗生物污垢活性。同时，表面正电场对负[UO ₂（CO ₃）]具有强静电吸引₃ ] ⁴⁻在海水中，可以显着提高铀的提取能力。得益于BD-TN-AO的这些出色的光诱导作用，该吸附剂在含微生物的天然海水中模拟阳光照射下具有5.9 mg g ^-1的高铀吸附能力，是黑暗中吸附能力的1.48倍。