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Method for production of doped titanium oxide, doped titanium oxide, and visible light-responsive photocatalyst comprising the doped titanium oxide

A technology of titanium oxide and titanium dioxide, applied in the direction of metal/metal oxide/metal hydroxide catalyst, titanium oxide/hydroxide, physical/chemical process catalyst, etc., can solve the problem of lack of standardization and detailed study of carbon atom combination State, titanium oxide structure, and physical properties are not sufficiently limited, and achieve the effect of high usefulness

Inactive Publication Date: 2009-10-21
DIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is substantially the same as the current thermal sintering method of the precipitate generated by the sol-gel reaction of titanium alkoxide, as mentioned above, it lacks reproducibility
In addition, the bonding state of the doped carbon atoms, etc. was not studied in detail
That is, the structural analysis of doped titanium oxide was not carried out, and only the visible light photocatalytic function based on the carbon content was focused and discussed.
In addition, in the photocatalyst proposed in the aforementioned Patent Document 4, a peak derived from sodium that was clearly not used as a raw material was observed, and its amount was measured, so it was difficult to say that the structure of the obtained titanium oxide was controlled.
This production method is based on the aforementioned plasma method, and practicality cannot be expected from the viewpoints of reproducibility and industrial production methods.
[0011] The structure and physical properties of titanium oxide, which are industrially useful as visible light-responsive photocatalysts, are still not fully defined, and various parameters are used by different researchers without standardization

Method used

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  • Method for production of doped titanium oxide, doped titanium oxide, and visible light-responsive photocatalyst comprising the doped titanium oxide
  • Method for production of doped titanium oxide, doped titanium oxide, and visible light-responsive photocatalyst comprising the doped titanium oxide
  • Method for production of doped titanium oxide, doped titanium oxide, and visible light-responsive photocatalyst comprising the doped titanium oxide

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preparation example Construction

[0082] The preparation method of doped titanium oxide of the present invention is characterized in that by using the polymer or polymer metal complex and titanium dioxide nanocrystals to maintain a nanoscale interlayer distance, preferably 1 to 3nm interlayer distance The compounded body is used as a precursor, and the precursor is thermally fired, thereby converting it into titanium oxide doped with impurities. By using this preparation method, the size of the crystals can be controlled to about 10 nm.

[0083] In addition to the function of the structure itself, nanostructures such as nanocrystals and nanospaces, as new nano-reaction sites, hide many possibilities in the synthesis of new functional materials. In particular, when a substance forming the second component is enclosed in a nanolayer structure between layers of a nanometer distance between crystals of a semiconductor crystal, a chemical reaction between the surface of the semiconductor crystal and the substance e...

Embodiment

[0117] Hereinafter, the present invention will be described more specifically by way of examples and reference examples, but the present invention is not limited thereto. "%" means "% by mass" unless otherwise specified.

[0118] [Analysis by X-ray Diffraction (XRD)]

[0119] The separated and dried sample was placed in a measurement sample holder, and then placed in a wide-angle X-ray diffraction device "Rint-Ultma" manufactured by Rigaku Corporation, under Cu / Kα rays, 40kV / 30mA, and a scan speed of 1.0° / min, under the condition of scanning range 0~40°. (Drying conditions: 25° C.×24 hours).

[0120] [Analysis by Thermogravimetry (TG) / Differential Thermal Analysis (DTA)]

[0121] Weigh it with a powder measuring patch (patch), put it into a TG / DTA 6300 device manufactured by SII NanoTechnology Inc., and measure it within a temperature range from 20°C to 800°C at a heating rate of 10°C / min.

[0122] [Analysis by Raman Spectroscopy (Raman)]

[0123] The Raman spectrum of t...

Synthetic example 1

[0139] [Layered composite of polyethyleneimine and titanium dioxide (P1)]

[0140] A water-soluble titanium compound ORGATIX TC-310 (titanium lactato produced by Matsumoto Pharmaceutical Co., Ltd.) was mixed with 25% ammonia water to prepare a 28 vol% concentration (pH=9) TC-310 aqueous solution. 20 ml of an aqueous solution of 2 wt% polyethyleneimine (trade name "EPOMIN SP-200", manufactured by Nippon Shokubai Co., Ltd.) was added dropwise to 20 ml of this solution while stirring at room temperature (25°C). The mixture was stirred for 30 minutes to obtain a white precipitate. The precipitate was filtered, washed with distilled water, and then dried overnight at 50° C. in a vacuum desiccator. Yield 1.2 g. As a result of XRD measurement, a strong scattering peak appears between 3° and 5° of 2θ angle. The peaks in this small-angle region strongly indicate the existence of a periodic layered structure in the powder ( Figure 1.1 ). At the same time, it is clearly shown from ...

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Abstract

Disclosed is a doped titanium oxide which is responsive to a visible light and has a specified structure or the like. Also disclosed is a simple method for producing the doped titanium oxide. A basic polymer having an amino group and a water-soluble titanium compound are used to form a layered polymer / titania complex which has the polymer and the titania laminated alternatively on each other. The complex is burned with heat to dope a carbon atom and a nitrogen atom contained in the polymer into the crystal surface of titanium oxide. A metal ion may be doped into the titanium oxide by complexing the polymer with a metal ion previously.

Description

technical field [0001] The present invention relates to a doped titanium oxide doped with carbon atoms, a preparation method thereof, and a visible light-responsive photocatalyst using the doped titanium oxide. The doped titanium oxide can be used as a visible light-responsive photocatalyst and a solar cell. Semiconductor and fuel cell catalysts. Background technique [0002] Among high-end materials, titanium oxide has attracted attention due to its different application properties from conventional white pigments and high-refractive-index materials (see, for example, Non-Patent Document 1). For example, titanium oxide is an outstanding catalyst material in the photocatalyst or dye-sensitized charge separation function, and it is expected to be applied in next-generation photocatalyst devices and solar cells. In addition, research and development of an electrode layer in which platinum nanoparticles are embedded in titanium oxide is emerging in fuel cells, which have attra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J27/20C01G23/047B01J35/00
CPCB01J35/006B01J23/745B01J35/004B01J23/06B01J37/031C01P2002/84B01J23/26C01P2002/72B01J23/755B01J23/72C01P2002/01C01P2002/22C01P2002/52B01J37/084B01J23/34C01G23/047B82Y30/00C01P2002/82B01J37/08C01P2002/54B01J35/002C09C1/3676C01P2002/88B01J23/75B01J37/0018C01P2004/64C01P2004/04B01J21/063C01P2002/86C01G23/04B01J35/393B01J35/30B01J35/39
Inventor 金仁华诸培新深泽宪正
Owner DIC CORP