摘要
乏燃料后处理废气中的放射性氙(Xe)和氪(Kr)的捕集和分离是核燃料循环的重要一环。固体吸附分离法在室温条件下实现氙与氪的分离更有效率,具有诸多优点,而高性能的吸附材料是该方法的关键。本文通过直接碳化ZIF-7前驱体的方法制备了MOF衍生的微孔碳材料Z7CB-1000。298 K及100 k Pa条件下Z7CB-1000对Xe的静态吸附容量为3.72 mmol·g-1,亨利系数为69.6 mmol·g-1·bar,Xe/Kr亨利选择性为19.1;穿透实验结果表明,298 K及100 k Pa条件下Z7CB-1000对Xe的动态吸附容量为17.6 mmol·kg-1,表明Z7CB-1000是一种有潜力的Xe吸附分离孔材料,可望用于核燃料循环中废气中Xe的捕集与分离。
The capture and separation of volatile radionuclides such as Xenon(Xe)and krypton(Kr)that evolve into reprocessing facility off gas of the used nuclear fuel(UNF)is a major concern and significant importance for the reprocessing of UNF.Adsorptive separation xenon and krypton using solid porous materials at ambient conditions is more effective for its merits,while the adsorptive performance of the adsorbent become the key role.Herein,we prepared MOF-derived nanoporous carbon Z7CB-1000 for Xe/Kr separation using zeolite-type MOF ZIF-7 as precursor and template with a direct carbonization process.Z7CB-1000 exhibits significantly high Xe adsorption capacity(3.72 mmol g-1 at 298K and 100kPa),Xe Henry coefficient of 69.6 mmol g-1 bar-1 and Xe/Kr Henry selectivity of 19.1.Breakthrough experiments show that Z7CB-1000 exhibits a dynamic Xe adsorption capacity of 17.6 mmol kg-1 at 298 K and 100 kPa,indicating Z7CB-1000 a promising candidate for capture and separation of Xe under dynamic dilute conditions pertinent to nuclear fuel reprocessing.
作者
龚有进
熊顺顺
唐元明
刘强
胡胜
GONG You-jin;XIONG Shun-shun;TANG Yuan-ming;LIU Qiang;HU Sheng(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2018年第8期1336-1342,共7页
Chemical Research and Application
关键词
ZIF-7
多孔碳
氙
吸附
ZIF-7
porous carbon
xenon
adsorption
作者简介
联系人简介:胡胜(1973-),男,研究员。主要从事放射化学方向研究。E-mail:husheng205@caep.cn。
