Branched fibrous amidoxime adsorbent with ultrafast adsorption rate and high amidoxime utilization for uranium extraction from seawater  

作　　者：Wan-Ning Ren Xin-Xin Feng Yu-Long He Ming-Lei Wang Wan-Feng Hong Hong-Wei Han Jiang-Tao Hu Guo-Zhong Wu 

机构地区：[1]School of Physical Science and Technology,ShanghaiTech University,Shanghai,200031,China [2]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai,201800,China [3]University of Chinese Academy of Sciences,Beijing,100049,China [4]College of Science,University of Shanghai for Science and Technology,Shanghai,200093,China [5]College of Science,Shanghai University,Shanghai,200444,China

出　　处：《Nuclear Science and Techniques》2023年第6期79-90,共12页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.11675247,22176194).

摘　　要：Direct collection of uranium from low uranium systems via adsorption remains challenging.Fibrous sorbent materials with amidoxime(AO)groups are promising adsorbents for uranium extraction from seawater.However,low AO adsorption group utilization remains an issue.We herein fabricated a branched structure containing AO groups on polypropylene/polyethylene spun-laced nonwoven(PP/PE SNW)fibers using grafting polymerization induced by radiation(RIGP)to improve AO utilization.The chemical structures,thermal properties,and surface morphologies of the raw and treated PP/PE SNW fibers were studied.The results show that an adsorptive functional layer with a branching structure was successfully anchored to the fiber surface.The adsorption properties were investigated using batch adsorption experiments in simulated seawater with an initial uranium concentration of 500μg·L^(−1)(pH 4,25℃).The maximum adsorption capacity of the adsorbent material was 137.3 mg·g^(−1)within 24 h;moreover,the uranyl removal reached 96%within 240 min.The adsorbent had an AO utilization rate of 1/3.5 and was stable over a pH range of 4–10,with good selectivity and reusability,demonstrating its potential for seawater uranium extraction.

关 键 词：Radiation graft technology Branching structure High amidoxime utilization Seawater uranium extraction Ultrafast adsorption 

分 类 号：TL212[核科学技术—核燃料循环与材料]