Efficient extraction of uranyl [U(VI)O_(2)^(2+)] from fluoride-containing wastewater is important for both uranium mining and fuel rod manufacturing.However,it remains challenging due to the strong interaction between...Efficient extraction of uranyl [U(VI)O_(2)^(2+)] from fluoride-containing wastewater is important for both uranium mining and fuel rod manufacturing.However,it remains challenging due to the strong interaction between U(VI)O_(2)^(2+)and F^(-),which results in the formation of water-soluble and stable [UO_(2)F_(n)]^(2-n)(n = 0,1,2,3,4) complexes.Herein,we propose an innovative nanospaceconfined adsorption electrocatalytic strategy(NAES) that enables efficient extraction of U(VI)O_(2)^(2+)from fluoride-containing wastewater.This is realized by rationally introducing amidoxime groups(R) into the interlayer region of a cobalt layered double hydroxide electrocatalyst(creating Co-LDH-R).The amidoxime groups selectively bind U(VI)O_(2)^(2+),which is further electrocatalytically converted to a K_(5)(UO_(2))_(2) F_(9) solid by the action of the Co^(2+)sites of Co-LDH-R through an electrocatalytic redox process in the presence of K^(+) and F^(-).Co-LDH-R can stably extract U(VI)O_(2)^(2+)from fluoride-containing wastewater streams,with a remarkable capacity of 7255.15 mg/g after 72 h,positioning it as one of the most effective U(VI) extractants reported to date.The generated solid K_(5)(UO_(2))_(2) F_(9) can be collected for storage or further processing.Therefore,our work offers a promising new pathway for uranium resource recovery under practical conditions.展开更多
基金supported by the National Natural Science Foundation of China (22322603,U2167218)the Fundamental Research Funds for the Central Universities (2025MS052)+1 种基金funding support from the Mac Diarmid Institute for Advanced Materials and Nanotechnologythe New Zealand Ministry。
文摘Efficient extraction of uranyl [U(VI)O_(2)^(2+)] from fluoride-containing wastewater is important for both uranium mining and fuel rod manufacturing.However,it remains challenging due to the strong interaction between U(VI)O_(2)^(2+)and F^(-),which results in the formation of water-soluble and stable [UO_(2)F_(n)]^(2-n)(n = 0,1,2,3,4) complexes.Herein,we propose an innovative nanospaceconfined adsorption electrocatalytic strategy(NAES) that enables efficient extraction of U(VI)O_(2)^(2+)from fluoride-containing wastewater.This is realized by rationally introducing amidoxime groups(R) into the interlayer region of a cobalt layered double hydroxide electrocatalyst(creating Co-LDH-R).The amidoxime groups selectively bind U(VI)O_(2)^(2+),which is further electrocatalytically converted to a K_(5)(UO_(2))_(2) F_(9) solid by the action of the Co^(2+)sites of Co-LDH-R through an electrocatalytic redox process in the presence of K^(+) and F^(-).Co-LDH-R can stably extract U(VI)O_(2)^(2+)from fluoride-containing wastewater streams,with a remarkable capacity of 7255.15 mg/g after 72 h,positioning it as one of the most effective U(VI) extractants reported to date.The generated solid K_(5)(UO_(2))_(2) F_(9) can be collected for storage or further processing.Therefore,our work offers a promising new pathway for uranium resource recovery under practical conditions.
