偕胺肟基团功能化共轭介孔聚合物用于可监控快速海水提铀  

Amidoxime-Functionalized Conjugated Mesoporous Polymerfor Monitorable and Rapid Extraction of Uranium From Seawater

作　　者：刘鹏[1] 王子昱[1] 徐美芸 华道本[1] LIU Peng;WANG Zi-yu;XU Mei-yun;HUA Dao-ben(School of Radiation Medicine and Protection,Soochow University,Suzhou 215000,China)

机构地区：[1]苏州大学放射医学与防护学院,江苏苏州215000

出　　处：《核化学与放射化学》2022年第3期265-275,I0005,共12页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(U1867206,21906115)。

摘　　要：海水提铀是核能可持续发展的重要保障之一。快速提铀材料凭借短吸附周期可减少生物污损、老化而延长使用寿命,因此优化吸附周期可获得更高的提铀效率和经济效益。为此,本研究设计了一种偕胺肟修饰的共轭介孔聚合物(CMPAO)用于可监控的快速海水提铀。以具有优良聚集诱导发光性质的三苯胺和修饰有偕胺肟的芴衍生物为构建单元合成吸附材料,UO_(2)^(2+)被偕胺肟基团捕捉后,经共振能量转移增强CMPAO的电化学发光(ECL)信号,从而实现吸附过程的监测,以确定最优的吸附周期。结果表明:CMPAO在铀酰溶液(5×10^(-5)mol/L)中可在20 min内达到吸附平衡,对U的吸附容量为182.5 mg/g;在真实海水中,3 d即可基本完成吸附过程,CMPAO对U的吸附容量达到1.6 mg/g,同时CMPAO在海水中可实现铀吸附量与ECL强度的正相关,能够实时监测吸附过程,指示吸附量的变化,以确定最优吸附周期。Extracting uranium from seawater is an important guarantee for the sustainable development of nuclear energy.Rapid uranium extraction material has short adsorption cycle,which can reduce biofouling and aging to give long service life.Therefore,optimizing adsorption cycle can obtain higher uranium extraction efficiency and economic benefits.Herein,a conjugated mesoporous polymer(CMPAO)was developed for monitorable rapid uranium extraction from seawater using aggregation-induced emission-active triphenylamine and amidoxime modified fluorene moieties.Uranyl ions can be captured by amidoxime group to enhance the electrochemiluminescence(ECL)signal of CMPAO via resonance energy transfer mechanism,which can be applied in uranyl adsorption monitoring to improve adsorption process.The adsorption of CMPAO in uranyl solution(5×10^(-5) mol/L)can reach equilibrium within 20 minutes with a capacity of 182.5 mg/g.In real seawater,the adsorption process can be completed in 3 days,and the adsorption capacity for U reaches 1.6 mg/g.As the uranium adsorption increases,the ECL signal can be enhanced gradually,which can be employed in monitoring the adsorption process rapidly.

关 键 词：电化学发光 共轭介孔聚合物 海水提铀 可监控吸附 

分 类 号：TL212.5[核科学技术—核燃料循环与材料]