Magnetic KIT-6 nano-composite and its amino derivatives as convenient adsorbent for U(Ⅵ)sequestration  

作　　者：Jiafeng Ouyang Wenlu Guo Lin Wang Changming Nie Dadong Shao Weiqun Shi Liyong Yuan 

机构地区：[1]School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]School of Chemistry and Chemical Engineering,University of South China,Hengyang 421001,China

出　　处：《Frontiers of Chemical Science and Engineering》2023年第12期2037-2049,共13页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22276193,U20B2019,and U2067212);the National Science Fund for Distinguished Young Scholars(Grant No.21925603).

摘　　要：Although mesoporous silica with magnetically hybridized two-dimensional channel structures has been well studied in recent years,it remains a challenge to fabricate the counterpart with macroporous three-dimensional cubic structures since the highly acidic preparation conditions lead to dissolution of magnetic particles.Herein,we successfully prepared magnetic KIT-6 nano-composite and its amino derivatives by bearing acid-resistant iron oxide.The prepared materials exhibited excellent properties for U(VI)ions removal from aqueous solutions under various conditions.The experimental data show that the U(VI)adsorption features fast adsorption kinetics,high adsorption capacity and ideal selectivity toward U(VI).The adsorption process is of spontaneous and endothermic nature and ionic strength independence,and the adsorbents can be easily regenerated by acid treatment.Compared to pristine KIT-6,the introduction of magnetism does not reduce the efficiency of the material to remove U(VI)while exerting its role as a recovery adsorbent.The findings of this work further demonstrate the potential broad application prospects of magnetic hybrid mesoporous silica in radionuclide chelation.

关 键 词：magnetic nanoparticle 3D mesoporous silica amino functionalization adsorption of U(VI) acid resistance 

分 类 号：O64[理学—物理化学]