Hydration states of europium(III) adsorbed on silicas with nano-sized pores

Murota, Kento*; Aoyagi, Noboru; Mei, H.; Saito, Takumi*

Applied Geochemistry, 152, p.105620_1 - 105620_11, 2023/05

https://doi.org/10.1016/j.apgeochem.2023.105620

Uranium (VI) sorption on illite under varying carbonate concentrations; Batch experiments, modeling, and cryogenic time-resolved laser fluorescence spectroscopy study

Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Kozai, Naofumi; Sugiura, Yuki; Tachi, Yukio

Applied Geochemistry, 136, p.105178_1 - 105178_8, 2022/01

https://doi.org/10.1016/j.apgeochem.2021.105178

Adsorption state of Eu in small pores studied by TRLFS

Murota, Kento*; Aoyagi, Noboru; Mei, H.; Saito, Takumi*

no journal, , 

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, Eu 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.

Trivalent lanthanides sorption onto illite in the presence of carbonate

Sugiura, Yuki; Ishidera, Takamitsu; Aoyagi, Noboru; Mei, H.; Saito, Takumi*; Tachi, Yukio

no journal, ,