Ag-110m发射γ射线，半衰期为249d，具备高排放份额和生物富集性，已成为压水堆核电机组排放的影响周围环境的主要核素之一。受核电运行过程中添加剂或杂质的影响，Ag-110m主要以胶体态和离子态存在。Ag胶体因胶粒粒径差异和电荷较弱，难以被商业树脂所吸附，因此，如何选择性将其去除成为目前在运核电站亟待解决的问题。根据Ag-110m在核电站水化学环境下的形态分布特点，本项目采用射线引发接枝改性的方法在多孔聚苯乙烯微球的孔道和表面引入巯基和离子交换基，随后凭借静电吸引作用在微球上负载三价铁，制备出兼具氧化和吸附作用的多功能树脂。研究其对不同形态银胶体及银离子的吸附性能，通过调控微球粒径、孔径和树脂分子构造，最终建立从低放废液中分离Ag的最优化技术路线，解决困扰核电厂的放射性核素银污染问题。探讨树脂键合胶体态及离子态银的机理，补充和完善树脂对ppb级别Ag去除性能研究，并建立相应的吸附模型。

110mAg emits gamma rays with a half-life of 249d, and with characteristics of high emission share and bioconcentration. 110mAg, comes from PWR units, has become one of the major radionuclides affecting the surrounding environment. The chemical species of 110mAg are controlled by additives or impurities during operation process of nuclear power plant. Colloidal state (named Ag0) and ionic state are main chemical forms. It is difficult to remove Ag0 by commercial ion exchange resin because of the colloidal particle with different sizes and low charge. Therefore, the selective removal of Ag0 from radioactive waste is need to be solved urgently. In order to efficiently separate 110mAg in different chemical species, the porous polystyrene microspheres (PSM) are modified by radiation-induced grafting technique, and thiol and ion exchange groups are introduced into holes and surfaces of microspheres. Then, Fe3+ is loaded into modified PSM by electrostatic attraction to prepare resins with both oxidation and adsorption functions. The adsorption property of resins towards Ag0 with different morphologies and silver ions will be investigated. By setting up the optimization techniques for separating 110mAg from low-level radioactive waste liquid of nuclear power plant, we will overcome the most difficult problem which has really been bothering nuclear power plant caused by massive emissions of 110mAg. The mechanism of resins bonding silver colloid and ionic silver will be discussed. The scope of this research is expanded to removal of 110mAg at ppb level or below ppb level, and the corresponding adsorption model will be built.