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AssigneeHitachi, Ltd.
InventorsTakehiko Kitamori, Takashi Nishi, Tetsuo Fukasawa, Haruo Fujimori, Akira Sasahira, Yoshihiro Ozawa, Kazumichi Suzuki, Hideo Yusa
Estimating the term…
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.
A proces for oxidizing or reducing a dissolved substance which comprises adding a particulate semiconductor photocatalyst and a water-soluble electron acceptor or donor for the pariculate semiconductor photocatalyst to a solution containig a dissolved substance and irradiating the particulate semiconductor photocatalyst in the solution with an electromaonetic wave having an energy high enough to excite the pariculate semiconductor photocatalyst and a wavelength subsantially equal to the particle size of the particulate semiconductor photocatalyst.
A process for oxidizing or reducing a dissolved substance, which comprises 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 and substantially equal to the particle size of the particulate semiconductor photocatalyst.
A process for oxidizing or reducing a dissolved substance, which comprises 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 a laser beam 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 and substantially equal to the particle size of the particulate semiconductor photocatalyst.
Dependencies are inferred from the claim text.