Separation of the minor actinides(Am and Cm)from lanthanides in high-level liquid wastes(HLLW)is one of the most challenging chemical separation tasks known owing to their chemical similarities and is highly significant in nuclear fuel reprocessing plants because it could practically lead to sustainable nuclear energy by closing the nuclear fuel cycle.The solid phase extraction is proposed to be a possible strategy but all reported sorbent materials severely suffer from limited stability and/or efficiency caused by the harsh conditions of high acidity coupled with intense irradiation.Herein,a phenanthroline-based polymeric organic framework(PhenTAPB-POF)was designed and tested for the separation of trivalent americium from lanthanides for the first time.Due to its fully conjugated structure,PhenTAPB-POF ex-hibits previously unachieved stability under the combined extreme conditions of strong acids and high irradiation field.The americium partitioning experiment indicates that PhenTAPB-POF possesses an ul-trahigh adsorption selectivity towards Am(Ⅲ)over lanthanides(e.g.,SFAm(Ⅲ)/Eu((Ⅲ)=3326)in highly acidic simulated HLLW and relatively fast adsorption kinetics in both static and dynamic experiments.Am(Ⅲ)can be almost quantitatively eluted from the PhenTAPB-POF packed-column using a concentrated ni-tric acid elution.The high stability and superior separation performance endow PhenTAPB-POF with the promising alternative for separating minor actinides over lanthanides from highly acidic HLLW streams.

Afshin Khayambashi;Long Chen;Xue Dong;Kai Li;Zhipeng Wang;Linwei He;Suresh Annam;Lixi Chen;Yaxing Wang;Matthew V.Sheridan;Chao Xu;Shuao Wang

State Key Laboratory of Radiation Medicine and Protection,School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions,Soochow University,Suzhou 215123,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China

中国化学快报（英文版）

[1]Afshin Khayambashi;Long Chen;Xue Dong;Kai Li;Zhipeng Wang;Linwei He;Suresh Annam;Lixi Chen;Yaxing Wang;Matthew V.Sheridan;Chao Xu;Shuao Wang-.Efficient separation between trivalent americium and lanthanides enabled by a phenanthroline-based polymeric organic framework)[J].中国化学快报（英文版）,2022(07):3429-3434

americium,actinides,HLLW,PhenTAPB,unachieved,trahigh,SFAm

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