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-ray irradiation in zeolite-water mixtureSugawara, Atsushi*; Kumagai, Yuta; Watanabe, Masayuki; Kimura, Atsushi*; Taguchi, Mitsumasa*; Fujisawa, Kiyoshi*
no journal, ,
Radiation-induced decomposition of three chlorinated aromatic compounds in zeolite-water mixture was studied, in order to evaluate decomposition yields of the aromatics adsorbed on the zeolite. The adsorption and condensation in zeolite pore structure has a possibility to improve the decomposition yield of aqueous organics in treatments of environmental water using ionizing radiations. In this study, the decomposition yields of 4-chlorophenol (4-ClPh), 4-chlorobenzoic acid (4-ClBAc), 4-chlorobenzylamine(4-ClBAm) were examined. The decomposition yield of adsorbed 4-ClBAm was lower than that in pure water. On the other hand, adsorbed 4-ClPh decomposed at a yield as high as in pure water. Moreover, a slight increase in the yield was overserved for 4-ClBAc. These results suggest that the decomposition yields of adsorbed aromatics are dependent on the reactivity with carriers of energy transfer from solid zeolite framework to water in the pore.
Motokawa, Ryuhei; Endo, Hitoshi*
no journal, ,
no abstracts in English
Kaneko, Masashi; Watanabe, Masayuki; Miyashita, Sunao*; Nakashima, Satoru*
no journal, ,
In this study, we discussed the stability and bonding property of Eu and Am complexes with imidodiphosphinic acid which shows the same coordination geometry for both O- and S-donor ligands. We performed the geometry optimizations by referring to single crystal structures as their starting coordinates and calculated the Gibbs energy for the stabilization toward the hydrated complex. As the results, the calculated Eu and Am complexes have the same coordination geometries for O- and S-donor complexes and reproduced the metal-ligand distances of single crystal structures. The results of Gibbs energy indicated that O-donor preferably coordinates to Eu over Am, meanwhile, S-donor selectively coordinates to Am over Eu.
2 single and double domain structureSuzuki, Shota; Yano, Masahiro; Uozumi, Yuki; Asaoka, Hidehito; Yamaguchi, Kenji*
no journal, ,
no abstracts in English
Murayama, Tatsuya*; Watanabe, Masayuki; Fujisawa, Kiyoshi*
no journal, ,
In this presentation, N,N,N',N'-Tetrakis(2-pyridylmethyl)ethylenediamine(TPEN) and the derivative, N,N,N',N'-Tetrakis(2-pyridylmethyl)-1,2-propanediamine(MeTPEN) which methylene chain was substituted by methyl group were used as ligand to synthesize europium complexes and which molecular structures and properties were compared by using spectroscopic methods.