Compositions – Radioactive compositions
Patent
1987-01-22
1988-09-27
Lechert, Jr., Stephen J.
Compositions
Radioactive compositions
20415715, 20415721, 20415722, 20415741, 20415744, 2041575, 20415751, 252629, B01J 1912, G21F 916, G21E 1942
Patent
active
047740264
ABSTRACT:
A dissolved substance contained in a solution is oxidized or reduced by adding a particulate semiconductor photocatalyst and a water-soluble electron acceptor or donor for the particulate semiconductor photocatalyst to a solution containing a dissolved substance, and irradiating the particulate semiconductor photocatalyst in the solution with an electromagnetic wave having an energy high enough to excite the particulate semiconductor photocatalyst, or by adding a particulate semiconductor photocatalyst and a water-soluble electron acceptor or donor for the particulate semiconductor photocatalyst to a solution containing a dissolved substance and irradiating the particulate semiconductor photocatalyst in the solution with an electromagnetic wave having an energy high enough to excite the particulate semiconductor photocatalyst and having a wavelength outside the absorption wavelength region of a precursor substance capable of producing an oxidation or reduction reaction-inhibiting substance, whereby (1) ions or complexes are converted to simple substances or to ions or compounds with different valencies, and (2) simple substances, ions, complexes or other compounds are separated and recovered or removed by utilizing its actions and effects.
REFERENCES:
patent: 3085952 (1963-04-01), Odioso et al.
patent: 3901806 (1975-08-01), Murchison
patent: 4451342 (1984-05-01), Lichtin et al.
patent: 4571290 (1986-02-01), Ward et al.
patent: 4619838 (1986-10-01), Meier et al.
patent: 4655891 (1987-04-01), Ward et al.
Jensen et al., Recovery of Noble Metals from Fission Products, Nuclear Technology, vol. 65, May 1984, pp. 305-324.
Fujimori Haruo
Fukasawa Tetsuo
Kitamori Takehiko
Nishi Takashi
Ozawa Yoshihiro
Hitachi , Ltd.
Lechert Jr. Stephen J.
Locker Howard J.
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