铀
萃取(化学)
化学
吸附
吸收(声学)
化学吸附
光催化
激进的
核化学
催化作用
无机化学
材料科学
有机化学
冶金
复合材料
作者
Kaifu Yu,Yi Li,Xin Cao,Ruixiang Wang,Li Zhou,Linzhen Wu,Ningning He,Jia Lei,Dengjiang Fu,Tao Chen,Rong He,Tao Chen
标识
DOI:10.1016/j.jhazmat.2023.132356
摘要
The development of inexpensive and efficient semiconductor catalysts for photo-assisted uranium extraction from seawater remains a huge challenge. Herein, we have successfully synthesized amidoxime-rich g-C3N4 (AO-C3N4) by simply amidoximing a cyano-rich precursor for photo-assisted uranium extraction from seawater. The amidoxime groups not only served as the U(VI) binding sites for efficient uranium adsorption, but also significantly improved the visible light absorption capacity and carrier separation efficiency via introducing defect energy level, resulting in the excellent photocatalytic activity for AO-C3N4 towards photo-assisted uranium extraction. In the process of photo-assisted uranium extraction, U(VI) was first adsorbed by the amidoxime groups on the AO-C3N4 and then reduced to U(IV), while (UO2)O2·2H2O and (UO2)O2·4H2O were further formed by the oxidation of U(IV) by superoxide radicals (·O2-). Moreover, the generated reactive oxygen species (ROS) under light endowed AO-C3N4 with outstanding antibacterial properties, preventing the limitation of uranium extraction capacity from marine biofouling.
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