[2H07-12] Migration/Sorption 2

[2H12] Adsorption state of Eu in small pores studied by TRLFS

*Kento Murota^1,2, Noboru Aoyagi³, Huiyang Mei³, Takumi Saito¹ (1. UTokyo, 2. NRA, 3. JAEA)

Keywords:Adsorption, Times-resolved laser fluorescence spectroscopy, Eu, Mesoporous silica

In the fate of radionuclides leached from radioactive wastes in the underground, adsorption to small pores in rocks and buffer materials during migration is an important mechanism. It has been reported that water properties in mesoscale (2-50 nm) and nanoscale (<2 nm) pores differ from those in larger pores. However, it is not clear how the sorption of ions changes in confinement. In this study, Eu³⁺ was adsorbed on mesoporous silicas with different mesopore distributions as analogues of natural rocks with small pores, and the adsorption state was analyzed by TRLFS. We report the results of multivariate analysis of the obtained data to investigate how the adsorption state of Eu³⁺ changes with pore size.