TWM460098U - Titania photocatalyst film structure - Google Patents

Abstract

This utility model declares the structure of titania photocatalyst film on the substrate. The film is composed of many nanosized titania particles with anatase crystal. The shape of titania is rhombus, the long axis is 10-15 nm and the short axis is 3-6 nm. The transparent TiO2 film on substrates exhibits super-hydrophylic property. It has very high photoactivity under illumination by ultraviolet visible light, and sunlight. It has self-cleaning and dirt-removing capabilities.

Description

Structure of titanium dioxide photocatalyst film

The present invention discloses a structure in which a titanium dioxide film is supported on a carrier, which is supported by a nano-sized titanium dioxide solid particle supported on a carrier, and the titanium dioxide is an ellipsoidal particle having an anatase structure.

A photocatalyst is a substance that promotes a chemical reaction by irradiation of light. The materials currently available as photocatalysts include oxides such as titanium dioxide, which are most commonly used as photocatalysts because of their strong oxidizing power, high chemical stability, and non-toxic properties. Photocatalyst can be used to treat low concentrations of harmful chemicals in the air, and does not release harmful substances by itself. Therefore, it is an excellent catalyst for environmental purification. Photocatalysts have functions such as deodorization, sterilization, antibacterial, antifouling and removal of harmful substances.

The crystal structure of titanium dioxide includes three types of a tetragonal rutile type, an anatase type, and an orthorhombic brookite type. Among them, only anatase structure has the effect of photocatalyst. The photodecomposition mechanism of the photocatalytic treatment process is to excite the photocatalyst by ultraviolet light or sunlight to cause the catalyst to generate electrons and holes, thereby oxidizing the substances adsorbed on the surface, thereby decomposing the substances adsorbed on the surface into small molecules. Taking titanium dioxide as an example, titanium dioxide absorbs light to generate electrons and holes. This hole has a relatively strong oxidizing power and can be sucked. The contaminant molecules attached to the surface of the titanium dioxide are directly oxidized to decompose, or the water molecules adsorbed on the surface of the substance are oxidized to hydroxyl radicals. The pollutants of the original macromolecules cleave the macromolecules through photocatalytic reaction to achieve the purpose of removing pollutants.

Photocatalysts are widely studied and applied in environmental protection, energy, sterilization, and self-cleaning. Since 1972, Fujishima and Honda first published in Nature magazine that TiO ₂ will decompose water to produce H ₂ and O ₂ after illuminating. More and more people are investing in research on the photocatalytic properties of TiO ₂ and are committed to various possibilities. Modification method to improve the effect of TiO ₂ photocatalyst.

Titanium dioxide can be made into powder directly into the wastewater, or it can be applied to the surface of the substrate. The ultraviolet light can accelerate the decomposition of organic substances in water and air, but it will face how to recover the powder and the surface area of the catalyst. Fully accepting problems such as exposure to ultraviolet light. In order to improve these problems, titanium dioxide is formed into a film to increase the exposed area of titanium dioxide to increase the photocatalytic effect, which not only solves the above problems, but also increases the use of the titanium dioxide photocatalyst.

In order to produce a titanium dioxide film, several major preparation methods have been developed in recent years. A substrate having a large surface area is usually formed by chemical vapor deposition. The principle uses a chemical reaction to form a solid species in a reaction zone, and further deposits it on the surface of the carrier. The force is strong, and there must be high temperature equipment, and the process is complicated.

The Republic of China Patent Application No. 9212203 discloses a method for synthesizing a crystalline titanium dioxide photocatalyst, which is prepared by diluting titanium tetrachloride or titanium sulfate with ammonia to adjust the pH value, adding an appropriate oxidizing agent and a mineral acid, and forming a titanium dioxide photocatalyst according to operating conditions. Sol, the titanium dioxide prepared by the invention is a large particle and is spherical, and its reaction activity is not high, and it is difficult to adhere to a carrier to form a film.

The Republic of China Patent Application No. 96142648 discloses a non-reducing transparent substrate A transparent water-based nano sol gel coating composition for visible light and solar light transmittance and a coating method thereof, which are mainly composed of a zeolite sol which is prepared by using an alkoxide and which has a complicated process.

The Republic of China Patent Application No. 95129291 is a "method of preparing a nano film by a low temperature process", which discloses a method using titanium dioxide, which has a complicated process, and the titanium dioxide is a large spherical type, and the photocatalytic activity is not high.

The method of preparing titanium dioxide nano-powder is disclosed in the Republic of China Patent Application No. 92128954, which is modified by adding an oxide or an inorganic acid such as perchloric acid, and adding a modifier and a surfactant, etc., and the invention needs to be modified. The agent and the surfactant can be used to stably suspend the prepared titanium dioxide in water, and the suspension is acidic. The titanium dioxide prepared by the invention is large particles and is spherical, and its reaction activity is not high, and it is not easy to adhere. A film is formed on the carrier.

In the prior art, spherical titanium dioxide was used, and the particles were large. When the film was composed of titanium dioxide, the gap between them was large, and the photocatalytic activity was poor.

The present invention discloses a structure in which a titanium dioxide film is supported on a carrier having a thickness of 0.5 mm to 1 mm and a photocatalytic film of tantalum dioxide is supported on a carrier, and the titanium dioxide is an elliptical sphere. The granules have an anatase structure, the elliptical sphere has a major axis of 10 to 15 nm, and the minor axis is 3 to 6 nm. This elliptical sphere is more active than the spherical titanium dioxide used in the prior art. When the titanium dioxide particles are elliptical, the gap between them is small, so the amount of titanium dioxide per unit volume is increased, and when the titanium dioxide is an elliptical sphere, the photocatalytic activity is increased. This elliptical sphere is used in the prior art The spherical titanium dioxide has high activity, and the titanium dioxide film has super hydrophilicity on the carrier and has strong decontamination and self-cleaning effects. It is highly active by irradiation with fluorescent lamps, ultraviolet lamps or sunlight.

1‧‧‧ as a carrier

2‧‧‧ is a titanium dioxide film

Figure 1 shows the structure of a titanium dioxide film on a carrier.

Figure 2 shows the structure of the titanium dioxide film. Titanium dioxide is an ellipsoidal particle with An anatase structure, the elliptical sphere has a major axis of 10 to 15 nm and a minor axis of 3 to 6 nm.

Referring to Fig. 1 and Fig. 2, the present invention provides a structure of a titanium dioxide film on a carrier. The titanium dioxide film is supported on a carrier by a nanometer titanium dioxide solid particle, and the titanium dioxide is an ellipsoidal particle having anatase. Structure, the elliptical sphere has a major axis of 10 to 15 nm and a minor axis of 3 to 6 nm. The titanium dioxide film is super-hydrophilic on the carrier and has strong decontamination and self-cleaning effects. It is highly active by irradiation with fluorescent lamps, ultraviolet lamps or sunlight.

2‧‧‧ Titanium dioxide film

Claims (2)

A titanium dioxide photocatalyst structure is a titanium dioxide film supported on a carrier. The thickness of the titanium dioxide film is between 0.5 mm and 1 mm. The structure of the titanium dioxide photocatalyst film is carried by a nano-sized titanium dioxide solid particle supported on a carrier, and the titanium dioxide is an ellipse. Spherical particles having an anatase structure. The photocatalyst structure according to claim 1, wherein the elliptical sphere of titanium dioxide has a major axis of 10 to 15 nm and a minor axis of 3 to 6 nm.