Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Aoyagi, Noboru; Shimojo, Kojiro; Ikeda, Atsushi*; Watanabe, Masayuki; Brooks, N. R.*; Binnemans, K.*; Kimura, Takaumi
no journal, ,
Nankawa, Takuya; Ogoshi, Yurie; Watanabe, Masayuki
no journal, ,
Removal of cesium by porous materials from various environments has recently attracted much attention because of the Fukushima crisis. The behavior of cesium in the presence of porous materials, such as Cs uptake selectivity and permeability, may depend on the sizes of porous materials but the relationship is not revealed yet because controlling the pore sizes were difficult. On the other hand, Metal-organic framework (MOF) materials that have highly-ordered pore and the pores sizes of which can be controlled by selecting appropriate ligands and metals have been investigated in these two decades. We synthesized novel lanthanide-organic framework containing cesium ions with the formula of LnCs(ox)
(Ln = La, Eu, Tb, Er, Yb, Lu), the pore sizes of which can be precisely controlled by changing lanthanide ions, to investigate the relationship between Cs permeability and pore sizes.
Watanabe, Masayuki; Arisaka, Makoto; Kimura, Takaumi
no journal, ,
We have found that activated carbons(AC), carbon black, graphite and carbon nanotubes can separate An(III) from Ln(III) by adsorption and the intrinsic property of those materials without pre-treatment is to selectively adsorb Am(III) rather than Ln(III), and demonstrated that Am(III) can be successfully separated from Ln(III) by column chromatography with either AC or graphite. More recently we have discovered that actinides can be adsorbed to synthetic and natural diamonds, with regardless those sizes, in the acidic nitric solution. In this paper, the adsorption behavior of various valence of An were investigated and discussed by using carbon materials as well as diamonds.