Particulate titanium oxide, method and apparatus for manufacturing the same, and treatment methods using such titanium oxide

A manufacturing method and technology for manufacturing devices, applied in the field of titanium oxide particles and their manufacturing, manufacturing devices, and treatment using the titanium oxide, capable of solving problems such as reduced photocatalytic activity and reduced surface area, achieving high decomposition efficiency and high bactericidal effect Effect

Inactive Publication Date: 2006-01-18
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, it is generally known that when titanium oxide particles with an anatase crystal structure are supported, as described above, when heated to about 500°C to 700°C, the crystal structure changes to the rutile type, and the photocat

Method used

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  • Particulate titanium oxide, method and apparatus for manufacturing the same, and treatment methods using such titanium oxide
  • Particulate titanium oxide, method and apparatus for manufacturing the same, and treatment methods using such titanium oxide
  • Particulate titanium oxide, method and apparatus for manufacturing the same, and treatment methods using such titanium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] A synthesis tube made of quartz glass is used, and the heat source is an oxyhydrogen flame lamp. Titanium tetrachloride vapor and oxygen are introduced into the synthesis tube, and titanium oxide particles are produced by a thermal oxidation method heated from the outside of the synthesis tube. Titanium tetrachloride vapor was supplied by bubbling, the temperature of the bubbler was set to 85°C, and the pipe insulation temperature was set to 140°C. Argon was used as the bubbling gas, and its flow rate was set to 180 sccm. The reaction oxygen flow rate was set at 1000 sccm, and the synthesis temperature was set at 1230°C. Equipped with 6 oxyhydrogen flame lamps. The inner diameter of the quartz glass tube was 32 mm and the thickness was 2.5 mm, and it was rotated at 55 rpm.

[0176] The shape of the obtained titanium oxide particles was as follows figure 1 The decahedron shown. The average particle diameter is 20 nm, and the particle diameter distribution is such tha...

Embodiment 2

[0183] The titanium oxide particles obtained in Example 1 were coated on a quartz glass plate, and the photocatalytic activity was evaluated by ultraviolet irradiation.

[0184] The evaluation was performed using the ability to decompose acetaldehyde under the same conditions, and the concentration of carbon dioxide generated after decomposition was measured to compare the relationship with the oblateness H of the polyhedron constituting the titanium oxide particles. exist Figure 9 The middle represents the change with time of the carbon dioxide concentration of the titanium oxide catalyst having each oblateness. As a result, the samples with the flatness ratios of the polyhedrons of 1.01 and 1.58 showed the highest activity, and the samples with the flatness ratios of 0.53 and 2.16 showed slightly lower activities.

Embodiment 3

[0188] The titanium oxide particles obtained in Example 1 were coated on a quartz glass plate, coated with Escherichia coli, and irradiated with an ultraviolet lamp to investigate changes in the number of Escherichia coli over time. % or less of the time is 30 minutes.

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Abstract

Titanium oxide grains of large specific area and high crystallinity with reduced internal defects, whose high photocatalytic activity as a photocatalyst is promising; and titanium oxide grains which even when heated at high temperature, exhibits low tendency of transformation to rutile crystal structure and exhibits low rate of sintering. As titanium oxide grains for composing a photocatalyst, use is made of those of the shape of a boxy polyhedron. The polyhedron constituting the titanium oxide grains is composed of one or more titanium oxide single-crystal polyhedrons. The crystallinity can be enhanced by causing the flatness ratio of single-crystal polyhedrons to fall within the range of 0.33 to 3.0. It is preferred that the polyhedron be a hexa to decahedron. The rutile transformation ratio R (700 to 24) is to be 7.5% or less while the rutile transformation ratio R (500 to 24) is to be 2.0% or less. Titanium oxide grains of the above configuration are produced through a process comprising feeding titanium tetrachloride vapor and oxygen into a synthetic tube of quartz glass and heating them from the exterior of the synthetic tube by means of an oxyhydrogen flame burner so as to effect thermal oxidation.

Description

Background technique [0001] The present invention relates to titanium oxide particles used in photocatalysts and the like, a production method, a production device, and a treatment method thereof. By making titanium oxide particles into particles of a new shape, the photocatalytic activity of the photocatalyst can be greatly improved. [0002] Photocatalysts composed of titanium oxide particles are well known. The photocatalytic reaction of titanium oxide particles is a chemical reaction caused on the surface of titanium oxide particles, and the chemical substance to be decomposed begins its reaction by being adsorbed on the surface of titanium oxide particles. Therefore, the smaller the particle size of the titanium oxide particles, the higher the photocatalytic activity. [0003] In the prior inventions disclosed in Japanese Patent Laid-Open No. 11-267519, Japanese Patent Laid-Open No. 08-164334, and Japanese Patent Laid-Open No. 07-303835, it is desired to reduce the parti...

Claims

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Application Information

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IPC IPC(8): C30B29/16C01G23/07
Inventor 寺田佳弘上片野充贺嘉磊姬野邦治
Owner THE FUJIKURA CABLE WORKS LTD
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