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Suspension of titanium oxide loaded with transition metal compound

A transition metal, titanium oxide technology, applied in the direction of titanium compound, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of decreased exposure, insufficient photocatalytic ability, and difficulty in fully reducing the content of ionic impurities, achieve excellent responsiveness

Active Publication Date: 2017-05-10
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, it is difficult to sufficiently reduce the content of ionic impurities
Furthermore, when the transition metal compound-loaded titanium oxide is subjected to solid-liquid separation by the above-mentioned centrifugation or the like, the transition metal compound-loaded titanium oxide is compacted to reduce the exposed amount of the highly active surface. to the problem of sufficient photocatalytic capacity
In addition, once the compacted transition metal compound-loaded titanium oxide is redispersed after pulverization or the like, sufficient photocatalytic ability cannot be obtained.

Method used

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  • Suspension of titanium oxide loaded with transition metal compound
  • Suspension of titanium oxide loaded with transition metal compound
  • Suspension of titanium oxide loaded with transition metal compound

Examples

Experimental program
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preparation example Construction

[0054]

[0055] 1. with high-speed centrifuge (trade name " HP-301 ", manufactured by Beckman Coulter Company), the suspension of the titanium oxide that is loaded with transition metal compound is handled (with 40000G carries out 1 hour), and collects supernatant, will It is used for dilution of samples.

[0056] 2. Dilute the transition metal compound-loaded titanium oxide suspension with the above supernatant to a concentration in the range of absorbance from 0.05 to 0.08, and put it into a measurement chamber to measure the particle size distribution. The relative refractive index was set to 2.750 of rutile-type titanium oxide.

[0057] In addition, in the dilution of the above 2, the permeate (those having a conductivity of 300 μm or less) obtained by membrane filtration by the cross-flow method may be used instead of the supernatant described in the above 1.

[0058] In addition, the transition metal compound-loaded titanium oxide suspension of the present invention i...

Embodiment 1

[0117] (Preparation of Suspension of Crude Titanium Oxide)

[0118] At room temperature (25° C.), an aqueous solution of titanium tetrachloride (Ti concentration: 16.5% by weight ± 0.5% by weight, chloride ion concentration: 31% by weight ± 2% by weight, manufactured by Toho Titanium Co., Ltd.) was diluted with pure water, The Ti concentration was changed to 5.6% by weight. 5650 g of the diluted titanium tetrachloride aqueous solution was put into a tantalum-lined autoclave with a capacity of 10 L and sealed. Using a heat medium, the temperature inside the autoclave was raised to 140° C. over 2 hours. Then, while stirring the required power (Pv value) 1360W / m 3 While stirring, the autoclave was cooled to 40° C. or lower by cooling the heat medium after maintaining for 5 hours under the conditions of temperature: 140° C. and pressure: the vapor pressure of the temperature. Then, after maintaining temperature: 140 degreeC and pressure: the vapor pressure conditions of this temp...

Embodiment 2

[0127] (Preparation of Suspension of Crude Titanium Oxide)

[0128] At room temperature (25° C.), an aqueous titanium tetrachloride solution (Ti concentration: 16.5% by weight ± 0.5% by weight, chloride ion concentration: 31% by weight ± 2% by weight, manufactured by Toho Titanium Co., Ltd.) was diluted with pure water, The Ti concentration was set to 5.6% by weight. 5650 g of the diluted titanium tetrachloride aqueous solution was charged into a tantalum-lined autoclave with a capacity of 10 L and sealed. Using a heat medium, the temperature inside the autoclave was raised to 140° C. over 2 hours. Then, while stirring the required power (Pv value) 220W / m 3 While stirring, the autoclave was cooled by cooling the heat medium after maintaining for 10 hours under conditions of temperature: 140° C. and pressure: vapor pressure of the temperature. After confirming that the temperature in the autoclave had reached 40° C. or lower, 5650 g of the crude titanium oxide suspension (2)...

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Abstract

The present invention provides a suspension of titanium oxide loaded with a transition metal compound, which contains a titanium oxide crystal loaded with a transition metal compound, has an extremely low content of ionic impurities, has excellent responsiveness to visible light, and functions as an excellent photocatalyst. ability. The transition metal compound-supported titanium oxide suspension of the present invention is a transition metal compound-supported oxide suspension in which a transition metal compound is supported on crystalline titanium oxide and the average aspect ratio (longer diameter / shorter diameter) is 1.5 or more. When a titanium suspension contains 4% by weight or more of the titanium oxide loaded with a transition metal compound, the conductivity of the supernatant of the suspension is 300 μS / cm or less. The crystalline titanium oxide is preferably a rutile titanium oxide having a crystal plane (110) and a crystal plane (111) and / or a rutile titanium oxide having a crystal plane (110), a crystal plane (111) and a crystal plane (001). titanium.

Description

technical field [0001] The present invention relates to suspensions containing titanium oxide loaded with transition metal compounds. The transition metal compound-supported titanium oxide suspension has excellent responsiveness to visible light and can exhibit excellent photocatalytic capability. Background technique [0002] Titanium oxide loaded with transition metal compounds has a photocatalytic ability, and can exert strong oxidizing power by irradiating light such as visible light, which can decompose harmful chemicals into water or carbon dioxide, and through the suspension of titanium oxide loaded with transition metal compounds It can be coated or mixed with liquid, and it can impart antibacterial, antifungal, deodorizing, air purification, water purification and antifouling effects to the coated object or the mixed substance. Furthermore, it is known that when the transition metal compound-supported titanium oxide suspension contains ionic impurities such as halo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00B01J23/745B01J35/02B01J35/10C01G23/053B01J35/00
CPCB01J23/745B01J37/345C01G23/0536C01P2004/80C01P2004/62C01P2006/80C01P2006/12B01J35/39B01J35/40B01J35/613B01J35/615B01J2235/30B01J2235/00B01J35/70B01J21/063B01J37/0036C02F1/72Y02W10/37B01J35/33
Inventor 渡边仁志
Owner DAICEL CHEM IND LTD