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Antifungal and antibacterial materials comprising bismuth-added tungsten oxide photocatalysts

A photocatalyst, tungsten oxide technology, applied in the direction of tungsten oxide/tungsten hydroxide, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Visible light catalytic activity, inability to make full use of sunlight and other problems, to achieve excellent anti-fungal and anti-bacterial properties, excellent photocatalytic effect

Active Publication Date: 2018-08-24
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as the following: due to the large band gap of titanium oxide, although it can show activity under ultraviolet light, it has no absorption for visible light that accounts for most of the sunlight, and does not show catalytic activity for visible light, so it is impossible to make full use of sunlight. , and does not work indoors with very low UV light
[0006] However, because tungsten oxide is easy to dissolve in alkaline, it cannot be used directly in places where alkaline detergents are used, such as bathrooms, kitchens, washbasins, sinks, toilets, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0036] Table 1 shows the results of the antifungal test against Aspergillus niger. Compared with the antifungal activity value of 0.7 in Comparative Example 1 without adding bismuth, the antifungal activity values ​​in Examples 1 to 3 with bismuth added were 1.8, 1.7, and 1.5, respectively, and it was found that the antifungal activity was improved.

[0037] [Table 1]

[0038] Antifungal Properties of Tungsten Oxide Films (Aspergillus niger NBRC 105649)

[0039]

Embodiment 4-5

[0041] Table 2 shows the results of the antifungal test against Penicillium pinophilum. Compared with the antifungal activity value of 1.3 in Comparative Example 2 without adding bismuth, the antifungal activity values ​​in Example 4 and Example 5 with bismuth added were 2.8 and 1.5, respectively, and the antifungal activity was found to be improved.

[0042] [Table 2]

[0043] Antifungal Properties of Tungsten Oxide Films (Penicillium pinophilum NBRC 6345)

[0044]

Embodiment 6-7

[0046] Table 3 shows the results of the antibacterial test against Staphylococcus aureus (Staphylococcus aureus). Compared with the antibacterial activity value of 1.1 in Comparative Example 3 without adding bismuth, the antibacterial activity values ​​in Example 6 and Example 7 with bismuth added were 2.1 and 1.9, respectively, and it was found that the antibacterial activity was improved.

[0047] [table 3]

[0048] Bacterial Resistance of Tungsten Oxide Thin Films (Staphylococcus aureus NBRC 12734)

[0049]

[0050] As described above, the antifungal activity and antibacterial activity vary according to the type of fungus or bacteria to be targeted, and the activity values ​​also show different values ​​when bismuth is not added, but in each example , compared with the case without adding bismuth, the antifungal activity value and the antibacterial activity value can be improved by adding bismuth, showing a higher value of 1.5 or more, and reaching more than 2.0 ...

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PUM

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Abstract

The present invention addresses the problem of providing a material in which the the antifungal and antibacterial properties of a tungsten oxide are enhanced and which has excellent antifungal properties and antibacterial properties even in the form of a thin film. The antifungal and antibacterial material is characterized by including a tungsten-oxide photocatalyst to which bismuth has been added.

Description

technical field [0001] The present invention relates to a material excellent in antifungal activity and antibacterial activity, comprising bismuth-added tungsten oxide photocatalyst. Background technique [0002] In recent years, semiconductor photocatalysts that adsorb environmental pollutants and remove them through sunlight or indoor photolysis have attracted attention and have been intensively studied. Titanium oxide as its representative substance shows strong photocatalytic activity. However, there are problems such as the following: due to the large band gap of titanium oxide, although it can show activity under ultraviolet light, it has no absorption for visible light that accounts for most of the sunlight, and does not show catalytic activity for visible light, so it is impossible to make full use of sunlight. , and does not work indoors with very low UV light. As countermeasures against this, studies have been conducted on improving titanium oxide to absorb visib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/02B01J23/31B01J37/12C01G41/02
CPCB01J23/31B01J35/004B01J37/0223C01G41/02C01P2002/50C01P2002/54
Inventor 小西由也佐山和弘
Owner NAT INST OF ADVANCED IND SCI & TECH
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