Photocatalyst dispersion liquid, photocatalyst composite material and photocatalyst device

A composite material and photocatalyst technology, applied in catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of insufficient dispersion stability, insufficient coating film activity, etc. High dispersion stability and high acceleration effect

Active Publication Date: 2019-09-24
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is also known that these composite catalysts generally have insufficient dispersion stability in liquids, or insufficient activity in coating films, etc., and there is room for improvement.

Method used

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  • Photocatalyst dispersion liquid, photocatalyst composite material and photocatalyst device
  • Photocatalyst dispersion liquid, photocatalyst composite material and photocatalyst device
  • Photocatalyst dispersion liquid, photocatalyst composite material and photocatalyst device

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Effect test

no. 1 Embodiment approach

[0026] The catalyst particles contained in the photocatalyst dispersion liquid related to the embodiment are such as figure 1 As shown in , the main catalyst particles and the co-catalyst particles may form mutually composite composite particles 10 in addition to being independently dispersed. This composite catalyst particle 10 includes main catalyst particles 11 and co-catalyst particles 12 . Among them, the average particle diameter of the main catalyst particles is smaller than the average particle diameter of the co-catalyst particles. In addition, in water at 20° C. and pH 6, the zeta potential of the main catalyst particles is negative, and the zeta potential of the co-catalyst particles is positive. Particles with opposite zeta potentials tend to attract each other through electrostatic interactions. At this time, if the main catalyst particles are smaller than the co-catalyst particles, the main catalyst particles tend to surround the co-catalyst particles. As a re...

no. 2 Embodiment approach

[0041] Such as figure 2 As shown in , the photocatalyst composite material 20 according to the embodiment includes a substrate 21 and a photocatalyst layer 22 . Photocatalyst layer 22 includes main catalyst particles 23 and sub-catalyst particles 24 . Here, the average particle diameter of the main catalyst particles is smaller than the average particle diameter of the cocatalyst particles. In addition, in water at 20° C. and pH 6, the zeta potential of the main catalyst particles is negative, and the zeta potential of the co-catalyst particles is positive. Such a composite material can be obtained by applying the photocatalyst dispersion liquid described in the first embodiment to the surface of a substrate and drying it.

[0042] Particles with opposite zeta potentials become easily attracted to each other electrostatically. As a result, the small main catalyst particles tend to surround and closely adhere to the large co-catalyst particles. Therefore, in the case of ex...

no. 3 Embodiment approach

[0051] Figure 4 A schematic diagram showing an example of the configuration of the photocatalyst device according to the third embodiment is shown in .

[0052] As shown in the figure, the photocatalyst device 40 according to the embodiment includes the photocatalyst composite material 41 according to the second embodiment, a light irradiation member 42 for generating photocatalytic activity on the substrate, and a supply member for supplying substances to the photocatalyst composite material. 43. A chamber 44 including these members may be further provided. In addition, an introduction part 45a for introducing a substance to be processed or a discharge port 45b for discharging a processed substance may be provided.

[0053] Here, the substance to be processed is a substance intended to be changed by a chemical reaction promoted by photocatalysis of the photocatalyst composite material. Specific examples thereof include gases containing toxic components for which removal o...

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Abstract

The present invention provides a photocatalyst dispersion liquid having high dispersion stability and high antibacterial activity, a highly active photocatalyst composite material, and a photocatalyst device. The photocatalyst dispersion liquid comprises water, procatalyst particles having a negative zeta potential in water at 20 DEG C and a pH of 6, and a promoter particle having a positive zeta potential, wherein an average particle diameter of the main catalyst particles is higher than an average of the promoter particles The particle size is small.

Description

technical field [0001] The invention relates to a photocatalyst dispersion liquid, a photocatalyst composite material and a photocatalyst device. Background technique [0002] Photocatalysts are known to generate excited holes by light, promoting a strong oxidation reaction. Various photocatalysts are known as photocatalysts having such an action, and this promotion action is utilized for decomposition and removal of harmful organic molecules, sterilization, maintenance of hydrophilicity of substrates, and the like. For example, it is disclosed in Patent Document 1 that TiO 2 、WO 3 、Cu 2 O, Fe 2 o 3 Catalysts for the formation of metal oxides. It is also known that there are composite catalysts formed by combining these catalysts, for example, by using TiO 2 or WO 3 Such as the case where the main catalyst is combined with another metal oxide as a co-catalyst to improve the activity. However, it is also known that these composite catalysts generally have insufficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J23/80B01J23/89B01J37/02B01D53/86B01D53/58B01D53/72
CPCB01J23/888B01J23/80B01J23/8993B01J23/002B01J37/0215B01D53/8634B01D53/8668B01J2523/00B01J35/393B01J35/39B01J35/23B01J2523/27B01J2523/69B01J2523/842B01J2523/847B01J2523/17
Inventor 信田直美内藤胜之横田昌广千草尚太田英男大川猛荻原孝德猪又宏贵
Owner KK TOSHIBA
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