Titanium hydroxide, photocatalyst, and coating agent

Details Titanium hydroxide, photocatalyst, and coating agent Titanium hydroxide, photocatalyst, and coating agent

2001-12-21

2004-01-06

Silverman, Stanley S. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C502S350000

Reexamination Certificate

active

06673331

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a titanium hydroxide, photocatalyst obtainable from the titanium hydroxide and a coating agent comprising the titanium hydroxide.
BACKGROUND OF THE INVENTION
It has been researched that organic materials in water or NOx in air is decomposed and removed by a photocatalytic activity of photocatalyst such as a specific titanium oxide. In these days, it has been attracting an attention of researchers to decompose and remove such things using visible light as a light source in the point of general purpose and usage and it has been desired to develop a photocatalyst which exhibits a superior photocatalytic activity by irradiation of visible light.
Heretofore, the titanium oxide which can be used as a photocatalyst has been produced by calcining a titanium hydroxide, which may be commercially available. However, there are problems such that the photocatalyst obtained by calcining the commercially available titanium hydroxide does not show a sufficiently high photocatalytic activity by irradiation of visible light.
SUMMARY OF THE INVENTION
Objects of the present invention are to provide a titanium hydroxide, which may be suitable as a raw material for producing a titanium oxide which exhibits a sufficiently high photocatalytic activity by irradiation of visible light, and to provide a coating agent comprising the titanium hydroxide. Other objects of the present invention are to provide a photocatalyst obtainable from the titanium hydroxide and to provide a simple process for producing a titanium oxide which is suitable for photocatalyst usage.
The present inventors have undertaken extensive studies on a raw material for such a titanium oxide which is suitable for photocatalyst usage, and have completed the present invention.
Thus, the present invention provides a titanium hydroxide having:
(i) a primary differential spectrum of radial structure function obtained from an extended X-ray absorption fine structure spectrum of titanium K absorption edge, the primary differential spectrum having two or more maximal intensities and two or more minimal intensities at interatomic distances in the range of from 1.4 Å to 2.8 Å, at least two maximal intensities being at an interatomic distance of from 1.4 Å to 1.7 Å and at an interatomic distance of from 2.2 Å to 2.5 Å, respectively, and at least two minimal intensities being at an interatomic distance of from 1.9 Å to 2.2 Å and at the interatomic distance of from 2.5 Å to 2.8 Å, respectively; and
(ii) index X calculated by the equation:
X=
(
U
2
−L
2
)/(
U
1
−L
1
)
of about 0.06 or more, wherein U
1
and U
2
represent the maximal-intensity values at the interatomic distance of from 1.4 Å to 1.7 Å and at the interatomic distance of from 2.2 Å to 2.5 Å, respectively, and L
1
and L
2
represent the minimal-intensity values at the interatomic distance of from 1.9 Å to 2.2 Å and at the interatomic distance of from 2.5 Å to 2.8 Å, respectively, of the primary differential spectrum.
In addition, the present invention provides a coating agent comprising the above-mentioned titanium hydroxide and a solvent.
Furthermore, the present invention provides a photocatalyst obtainable from the above-mentioned titanium hydroxide and a process for producing the photocatalyst by calcining the titanium hydroxide or subjecting the titanium hydroxide to a hydrothermal treatment in the presence of a solvent.


REFERENCES:
patent: 5011674 (1991-04-01), Yoshimoto et al.
patent: 1 065 169 (2001-01-01), None
patent: 1 095 908 (2001-05-01), None
patent: 1 138 634 (2001-10-01), None
S. Sato, “Photocatalyst Activity of NO Doped TiO2In The Visible Light Region”, Chemical Physics Letter, vol. 123, No. 1,2, Oct. 22, 1985, pp. 126-128.

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