煤油
萃取(化学)
铀
化学
光催化
解吸
核化学
环境化学
吸附
催化作用
色谱法
材料科学
有机化学
冶金
作者
Yingtong Lv,Ru Cheng,Jing Wang,Peng Liu,Jing‐ye Zhang,Xiao-Fang Yu,Wencai Bai,Rong He,Tao Chen
标识
DOI:10.1016/j.cej.2023.141834
摘要
Photocatalytic extraction of hexavalent uranium (U(VI)) is challenging in organic phase, especially the widely used tributylphosphate (TBP)-kerosene system in the nuclear fuel cycle process. Organic components in TBP-kerosene system are difficult to be oxidized, which limits the reduction of U(VI). Herein, we demonstrated a self-oxidation strategy to enable the photocatalytic cycle of U(VI) reduction in TBP-kerosene system by the deeply oxidized commercial red phosphorus (DO-CRP). In the 30 %TBP-kerosene solution, the DO-CRP exhibited 88.0 % of extraction efficiency with 580.8 mg/g of capacity for U(VI) within 120 min. In this process, PO43− groups generated at the defects were used as the binding sites to capture and reduce U(VI). Following desorption process involved in the cleavage of uranium and PO43− groups, which released defect sites for self-oxidation in the next cycle. Mechanistic study revealed that such regeneration of self-oxidation and U(VI) binding sites achieved the continuous photocatalytic extraction of U(VI) in TBP-kerosene system.
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