JP2003199810A - Functional adsorbent and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel functional adsorbent and to provide a method for producing the same and an environmental purifying product. <P>SOLUTION: The functional adsorbent comprises coating titania particles partly covered on surfaces of the particles with ceramics inactive to a light and carried to a porous material. The method for manufacturing the functional adsorbent comprises the steps of dispersing the coating titania particles obtained by partly covering on the surfaces of the particles with the ceramics inactive to the light in a solvent, then coating the particles on the porous material and drying the coated material. The environmental purifying product comprises the functional adsorbent comprising the coating titania particles obtained by partly covering the surfaces of the particles with the ceramics inactive to the light and carrying to the porous material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel functional adsorbent having a substance-adsorbing and decomposing action, and more specifically, it not only adsorbs a foul odor or a harmful substance in the air, but also a photocatalyst for these substances. The present invention relates to a new functional adsorbent having an action of decomposing / detoxifying and removing by action, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, there has been a serious problem in the living space and the working space due to bad odors, volatile organic chemicals, and pollutants such as automobile exhaust gas. The sick house syndrome and chemical hypersensitivity, which are said to be caused by them, have become serious problems.

Conventionally, as a method for preventing a bad odor or a method for removing harmful substances in the air, a method of absorbing or adsorbing to an absorbent such as an acid or an alkali or an adsorbent has been often carried out. Disposal of waste liquid or used adsorbent is a problem and may cause secondary pollution. There is also a method of using a fragrance to mask the bad smell,
It has the drawback that the odor of the fragrance may be transferred to the food and may be damaged by the odor of the fragrance itself (see Non-Patent Document 1).

When the titania is irradiated with light, electrons having a strong reducing action and holes having a strong oxidizing action are generated, and the molecular species coming into contact with each other are decomposed by the redox action. By utilizing this kind of action of titania, that is, the photocatalytic action, decomposition and removal of organic solvents dissolved in water, environmental pollutants such as pesticides and surfactants, harmful substances in the air and foul odors etc. It can be carried out. This method can be repeatedly used only by utilizing titania and light, the reaction product is harmless carbon dioxide gas, etc., compared to methods such as biological treatment using microorganisms, temperature, pH, gas atmosphere,
It has the advantage that there are few restrictions on reaction conditions such as toxicity, and that even organic halogen compounds, which are difficult to treat by methods such as biological treatment, can be easily decomposed and removed.

However, in the research on decomposition / removal of organic substances by a titania photocatalyst, which is a photocatalytic substance composed of titania, which has been conducted so far, titania was used in powder form as a photocatalyst (see Non-Patent Documents 2 to 4). ). Therefore, there is a problem that it is difficult to handle and use, and it is difficult to put it into practical use. Therefore, it has been attempted to coat the activated carbon as a carrier with the titania photocatalyst and to carry it, but the strong photocatalytic action decomposes not only harmful organic substances and environmental pollutants but also the activated carbon as a carrier. Therefore, repeated use and long-term use were impossible. Also, a mixture of the titania photocatalyst and the activated carbon has been developed. In that case, since the titania photocatalyst and the activated carbon are not in close proximity to each other, the substance adsorbed by the activated carbon is treated as the titania photocatalyst. Was not able to be decomposed, so its performance was low.

[0006]

[Non-patent document 1] Konosuke Nishida, Heibonsha "Large Encyclopedia" 1
Volume, p136 (1984)

[Non-Patent Document 2] AL Pruden and DF Ollis, Jour
nal of Catalysis, Vol.82, 404 (1983)

[Non-Patent Document 3] H. Hidaka, H. Jou, K. Nohara, J. Z
hao, Chemosphere, Vol.25, 1589 (1992)

[Non-Patent Document 4] Teruaki Kuninaga, Kenji Harada, Keiichi Tanaka, Industrial Water, No. 379, 12 (1990).

[0007]

DISCLOSURE OF THE INVENTION The present invention has been newly developed in view of the above points, and it has a high durability and can be used repeatedly without decomposing the porous material of the carrier. In addition to adsorbing foul odors and harmful substances in the air, they can be decomposed / detoxified and removed to effectively and economically purify the environment. It is an object of the present invention to provide a functional adsorbent and a method for producing the same.

[0008]

The present invention for solving the above-mentioned problems comprises the following technical means. (1) A functional adsorbent characterized in that coated titania particles obtained by partially coating the surface of titania particles with light-inert ceramics are carried on a porous material. (2) Light-inert ceramics include alumina, silica, zirconia, zirconium titanate, magnesia,
Calcia, calcium phosphate, titanium phosphate, iron oxide,
The functional adsorbent according to (1) above, which is at least one kind of ceramics selected from ferrite, gypsum, and amorphous titania. (3) The titania particles are platinum, rhodium, ruthenium,
(1) The titania particles in which at least one metal selected from palladium, silver, copper, iron, and zinc is carried on the surface of the titania particles.
The functional adsorbent described. (4) The porous material is activated carbon, foamed plastics, glass fiber molded body, synthetic fiber molded body, FRP molded body, plastics-inorganic composite molded body, fiber molded body, activated alumina, zeolite, glass porous body, metal The functional adsorbent according to (1) above, which is at least one selected from a porous body, a ceramic porous body, a clay molded body, and an inorganic layered compound molded body. (5) The functional adsorbent according to (1) or (3) above, wherein the crystal form of the titania particles is anatase or brookite. (6) Functionality characterized in that the coated titania particles obtained by partially coating the surface of the titania particles with a ceramic inert to light are dispersed in a solvent, then coated on a porous material, and dried. Method for producing adsorbent. (7) Light-inert ceramics include alumina, silica, zirconia, zirconium titanate, magnesia,
Calcia, calcium phosphate, titanium phosphate, iron oxide,
The method for producing a functional adsorbent according to (6) above, which is at least one ceramic selected from ferrite, gypsum, and amorphous titania. (8) The titania particles are platinum, rhodium, ruthenium,
The method for producing a functional adsorbent according to (6) above, wherein at least one metal selected from palladium, silver, copper, iron and zinc is supported on the surface of the titania particles. (9) The porous material is activated carbon, foamed plastics, fiber molding, activated alumina, zeolite, glass porous body,
The method for producing a functional adsorbent according to (6) above, which is at least one selected from a porous metal body, a porous ceramic body, a clay molded body, and an inorganic layered compound molded body. (10) The crystalline form of titania particles is anatase or brookite, (6) or (8)
A method for producing the described functional adsorbent. (11) An environmental purification product comprising a functional adsorbent in which coated titania particles obtained by partially covering the surface of titania particles with a ceramic inert to light are supported on a porous material. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail. In the present invention, as the titania particles, not only titania having a stoichiometric ratio of titanium and oxygen, titania having a nonstoichiometric ratio of titanium and oxygen, titania of oxygen deficiency type, titania in which oxygen is partially nitrided, Titania or the like doped with metal ions is preferably used. The crystal form of titania is preferably anatase or brookite in terms of high performance as a photocatalyst, and rutile or amorphous one is not preferable because of low activity as a photocatalyst. In addition, platinum on the surface of titania,
Those loaded with metals such as rhodium, ruthenium, palladium, silver, copper and zinc are preferred, whereby
There are advantages that the redox decomposition rate of the chemical substance is further increased and the photocatalytic action is also increased.

Examples of the light-inert ceramics used in the present invention include alumina, silica, zirconia, zirconium titanate, magnesia, calcia, calcium phosphate, titanium phosphate, iron oxide, ferrite, gypsum, and amorphous titania. Are exemplified as preferable ones, but those having the same effect as these can be used similarly. In the present invention, the ceramics inert to light are
It is defined to include those having low activity and being substantially inactive as a photocatalyst.

The porous material used in the present invention includes:
Activated carbon, foamed plastics, glass fiber moldings, synthetic fiber moldings, FRP moldings, plastics-inorganic composite moldings, fiber moldings, activated alumina, zeolite, glass porous bodies, metal porous bodies, ceramic porous bodies, clay Molded products, inorganic layered compound molded products and the like are exemplified as suitable ones, but similar compounds can be used as long as they have the same effect. The glass porous body, metal porous body, ceramics porous body, clay molded body, inorganic layered compound molded body and the like may be molded using an organic binder.

In the functional adsorbent of the present invention, the coated titania particles obtained by partially coating the surface of the titania particles with a ceramic inert to light are dispersed in a solvent and then immersed in a porous material. It is produced by coating the porous material with a coating method and a method of spraying the coated titania particles onto the porous material and then drying. Here, “partially covered” means that the surface of the titania particles is covered with islands of light-inert ceramics, or the surface of the titania particles is completely covered with a ceramic film of holes that is inert to light. This means that the titania is not completely covered by the ceramic film that is inactive to light, but is partially exposed.

The functional adsorbent of the present invention thus obtained has a porous material carrying coated titania particles,
For example, the surface of the titania particles is covered with light-inert ceramics in an island shape, or the surface of the titania particles is covered with a ceramic film that is inactive as a photocatalyst with holes and is partially covered. , The carrier and the substance are separated, and the titania is partially exposed. Therefore, fluorescent lights, incandescent lights, black lights,
When artificial light from a UV lamp, mercury lamp, xenon lamp, halogen lamp, metal halide lamp, or sunlight is applied to the above titania, the redox effect of electrons and holes generated in the titania causes the porous material to become a carrier. Adsorbed offensive odors, harmful substances in the air such as NOx, or organic compounds that dissolve in water such as organic solvents and pesticides that pollute the environment are rapidly and continuously decomposed and removed. Antibacterial and antifungal are similarly decomposed and removed. When activated carbon is used as the porous material,
A functional adsorbent having a bright blue color can be obtained and can be used as a functional adsorbent excellent in adsorptivity, photocatalytic activity and decorativeness. The present invention includes a functional adsorbent composed of this blue activated carbon. The environmental purification products of the present invention include textile products, plastic products, paper products, ceramic products, glass products, concrete products, leather products, paints, inks,
Wood / bamboo products, artificial flowers, artificial foliage plants, interior products, accessories, electrical products, sheets, bags, etc.

In the case of an ordinary adsorbent, when a substance is adsorbed and saturated, it becomes impossible to adsorb the substance any more. However, the functional adsorbent according to the present invention removes the adsorbed substance only by irradiating light. Since it is disassembled, it can be used repeatedly, has the advantages of low cost, energy saving, and maintenance-free use for a long period of time. The adsorbent is a light-inert ceramic such as alumina, silica, zirconia, zirconium titanate, magnesia, calcia, calcium phosphate, titanium phosphate, iron oxide, ferrite, gypsum, or amorphous titania. The organic compound that pollutes the environment can be efficiently adsorbed by the adsorption action of. Furthermore, on the surface of the titania particles,
Platinum or rhodium, ruthenium, palladium, silver,
When a material carrying a metal such as copper, iron or zinc is used, the catalytic action further enhances the environmental purification effects such as the decomposition / removal effect of organic compounds and the antibacterial / antifungal effect. Furthermore, even when the porous material is an organic material, since the portion in contact with the organic material is a ceramic that is inactive to light, decomposition of the porous material does not easily occur, and the effect can be maintained for a long period of time. There is an advantage.

[0015]

EXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited to the following examples. Example 1 0.02 mol of tetraethoxysilane was diluted with 200 ml of absolute ethanol, and 0.2 mol of water was added while stirring.
Then, 0.4 g of polyethylene glycol having a molecular weight of 100,000 was added, and further 0.004 mol of nitric acid was added to prepare a transparent sol solution. To this, 20 g of anatase type titania particles having a particle size of about 1 μm was added and dispersed by ultrasonic waves,
After spray drying, it was baked at 500 ° C. When the surface of the obtained particles was observed with an analytical electron microscope, the surface was covered with silica having pores with a size of about 100 nm. The obtained coated titania particles were dispersed in water, granular activated carbon was added, and the mixture was thoroughly stirred and dried. The deodorizing effect of the functional adsorbent thus obtained was investigated as follows.

That is, 5 g of the above functional adsorbent was placed in a closed container having an internal volume of 36 liters, and acetaldehyde as a malodorous substance was introduced by a syringe to saturate the adsorbent.
Adjust the concentration of acetaldehyde contained in the closed container to 10
It was adjusted to 0 ppm and irradiated with black light having an intensity of 1 mW / cm ² . After 20 hours, when the concentration of acetaldehyde contained in the closed container was examined by gas chromatography, the concentration of acetaldehyde was reduced to 10 ppm. This value showed a deodorizing effect equivalent to that of the adsorbent produced by using the anatase type titania particles whose surface was not covered with silica as it was. Also,
As a result of conducting an accelerated deterioration test using a carbon arc lamp to examine the durability, it was found that the adsorbent produced by using the titania particles that did not coat the ceramics that are inactive to light as it was, gradually shattered the adsorbent. On the other hand, when the functional adsorbent of the present example was used, almost no change was observed and no deterioration in performance was observed.

Example 2 0.12 mol of aluminum triisopropoxide,
Dilute with 200 ml isopropanol and, with stirring, 0.12 mol triethanolamine and 1 mol water.
Was further added, and further 2.5 g of polyethylene glycol having a molecular weight of 1000 was added to prepare a transparent sol liquid. To this, 5 g of anatase type 70% and rutile type 30% titania particles having a particle diameter of about 40 nm were added, dispersed by ultrasonic waves, spray-dried, and then baked at 450 ° C. When the surface of the obtained particles was observed by an analytical electron microscope, the surface was covered with alumina having pores with a size of about 10 nm. The obtained coated titania particles were dispersed in water, then impregnated in a polyester fiber molding and dried. The deodorizing effect of the functional adsorbent thus obtained was investigated as follows.

That is, 5 g of the above-mentioned functional adsorbent was placed in a closed container having an internal volume of 36 liters, and isovaleric acid was introduced as a malodorous substance with a syringe to saturate the adsorbent. Increase the concentration of herbate to 50ppm, 1
It was irradiated with a black light having an intensity of mW / cm ² .
After 20 hours, when the concentration of isovaleric acid contained in the closed container was examined by gas chromatography, the concentration of isovaleric acid was reduced to 5 ppm, and the titania particles whose surface was not covered with alumina were used as they were. A deodorizing effect equivalent to that of the produced adsorbent was obtained. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, as a result of using an adsorbent prepared by directly using titania particles that do not coat the ceramics which are inert to light, the adsorbent gradually increases. Whereas when the functional adsorbent of the present example was used, almost no change was observed and no deterioration in performance was observed, although it was broken into pieces.

EXAMPLE 3 0.2 mol of zirconium tetra-n-butoxide was added to 5 mol.
It was diluted with 00 ml of absolute ethanol, 0.4 mol of diethylene glycol and 0.4 mol of water were added with stirring, and 0.4 g of polyethylene glycol having a molecular weight of 13,000 was further added to prepare a transparent sol liquid. To this, 5 g of anatase-type titania particles having a particle size of about 800 nm supporting platinum were added, dispersed by ultrasonic waves, spray-dried, and then baked at 500 ° C. The obtained particles were dispersed in water, impregnated in a polyethylene terephthalate fiber molding, and dried. The obtained coated titania particles were observed by an analytical electron microscope, and as a result, the surface was covered with a zirconia film having pores with a size of about 50 nm. The coated titania particles obtained were dispersed in water, foamed plastics were added, and the mixture was thoroughly stirred and dried. The deodorizing effect of the functional adsorbent thus obtained was investigated as follows.

That is, 5 g of the above-mentioned functional adsorbent was placed in a closed container having an internal volume of 36 liters, and acetic acid as a malodorous substance was introduced by a syringe to saturate the adsorbent. 25 ppm, 1 mW / cm ²
It was irradiated with a black light of high intensity. 20 hours later,
When the concentration of acetaldehyde contained in the closed container was examined by gas chromatography, the concentration of acetaldehyde was reduced to 2.5 ppm, and the adsorbent produced by using the anatase-type titania particles whose surface was not covered with zirconia as it was. The same deodorizing effect as in the case of was obtained. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, the adsorbent produced using the anatase type titanium oxide that does not coat the ceramics inert to light as it is Although it gradually shattered, when the above-mentioned functional adsorbent was used, almost no change was observed and no deterioration in performance was observed.

Example 4 0.1 mol of titanium tetraisopropoxide was added to 200
It is diluted with ml of absolute ethanol, 0.1 mol of diethanolamine and 0.1 mol of water are added with stirring,
Furthermore, 5 g of polyethylene glycol having a molecular weight of 20,000 was added to prepare a transparent sol solution. The particle size is about 500n
5 g of m anatase-type titania particles were added, dispersed by ultrasonic waves, spray-dried, and then baked at 350 ° C. When the surface of the obtained particles was observed with an analytical electron microscope,
The surface was covered with amorphous titania having pores with a size of about 120 nm. The obtained coated titania particles were dispersed in water, sprayed on a clay molded body and dried. The deodorizing effect of the functional adsorbent thus obtained was investigated as follows.

That is, 5 g of the above functional adsorbent was placed in a closed container having an internal volume of 36 liters, and methyl mercaptan as a malodorous substance was introduced by a syringe to saturate adsorption.
Set the concentration of methyl mercaptan contained in the closed container to 2
It was made 5 ppm and irradiated with a black light having an intensity of 1 mW / cm ² . After 20 hours, when the concentration of methyl mercaptan contained in the closed container was examined by gas chromatography, the concentration of methyl mercaptan was reduced to 2.5 ppm, and the anatase-type titania surface was not covered with amorphous titania. A deodorizing effect equivalent to that of the adsorbent prepared by using the particles as they were was obtained. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, the adsorbent produced using the anatase type titanium oxide that does not coat the ceramics inert to light as it is Although it gradually shattered, when the above-mentioned functional adsorbent was used, almost no change was observed and no deterioration in performance was observed.

Example 5 500 ml of 0.1 mol of titanium tetraisopropoxide and 0.1 mol of zirconium tetra-n-butoxide were added.
Of isopropanol, 0.4 mol of diisopropanolamine and 0.4 mol of water were added with stirring, and polyethylene glycol 4 having a molecular weight of 3000 was added.
g was added to prepare a transparent sol liquid. To this, 5 g of anatase type titania particles supporting silver with a particle size of about 700 nm
, Ultrasonically disperse, spray-dry, then 50
Baked at 0 ° C. As a result of observing the obtained particles by an analytical electron microscope, the surface was covered with zirconium titanate having pores with a size of about 30 nm.
The obtained coated titania particles were dispersed in water, sprayed onto an inorganic layered compound molded product, and dried. The deodorizing effect of the functional adsorbent thus obtained was investigated as follows.

That is, 5 g of the above-mentioned functional adsorbent was placed in a closed container having an internal volume of 36 liters, hydrogen sulfide as a malodorous substance was introduced by a syringe to saturate the adsorbent, and then the hydrogen sulfide contained in the closed container was removed. Adjust the concentration to 60ppm, 1mW
It was irradiated with light of black light having an intensity of / cm ² . 20
After a lapse of time, when the concentration of acetaldehyde contained in the closed container was examined by gas chromatography, the concentration of hydrogen sulfide was reduced to 5 ppm, and the anatase-type titania particles whose surface was not covered with zirconium titanate were used as they were. The deodorizing effect equivalent to that of the adsorbent prepared in this way was obtained. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, the adsorbent produced using the anatase type titanium oxide that does not coat the ceramics inert to light as it is Although it gradually shattered, when the above-mentioned functional adsorbent was used, almost no change was observed and no deterioration in performance was observed.

Example 6 250 ml of 0.15 mol of magnesium ethoxide
N-ethyldiethanolamine (0.2 mol) and water (0.6 mol) were added to the above anhydrous ethanol with stirring, and further, 1.6 g of polyethylene glycol having a molecular weight of 1500 was added to prepare a transparent sol solution. To this, 5 g of anatase type titania particles with a particle size of about 500 nm
, Ultrasonically disperse, spray-dry, then 45
Baked at 0 ° C. As a result of observing the obtained particles by an analytical electron microscope, the surface was covered with magnesia having pores with a size of about 20 nm. The obtained coated titania particles were dispersed in water, coated on a porous glass body, and dried. Regarding the functional adsorbent thus obtained,
The deodorizing effect was investigated as follows.

That is, 5 g of the above-mentioned functional adsorbent was placed in a closed container having an internal volume of 36 liters, and NO was used as a harmful substance.
x was introduced with a syringe and saturated adsorption was performed, and then the concentration of NOx contained in the closed container was adjusted to 10 ppm and 1 mW / c.
It was irradiated with a black light having an intensity of m ² . After 20 hours, when the concentration of NOx contained in the closed container was examined by gas chromatography, the concentration of NOx was 0.5 ppm.
The deodorizing effect was similar to that of the adsorbent prepared by directly using the anatase-type titania particles whose surface was not covered with magnesia. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, the adsorbent produced using the anatase type titanium oxide that does not coat the ceramics inert to light as it is Although it gradually shattered, when the above-mentioned functional adsorbent was used, almost no change was observed and no deterioration in performance was observed.

Example 7 Calcium methoxide (0.2 mol) was diluted with 500 ml of methanol, 0.4 mol of monoethanolamine and 0.4 mol of water were added with stirring, and polyethylene oxide (0.50) having a molecular weight of 300,000 was added. A transparent sol solution was prepared by adding 2 g. The particle size is about 1.2μ
m ruthenium-supporting anatase-type titania particles (5 g) were added, dispersed by ultrasonic waves, and spray-dried.
Baked at ° C. As a result of observing the obtained particles with an analytical electron microscope, the surface was covered with calcia having pores with a size of about 200 nm. After dispersing the obtained coated titania particles in water, soak the metal porous body,
Dried. The deodorizing effect of the functional adsorbent thus obtained was investigated as follows.

That is, 5 g of the above functional adsorbent was placed in a closed container having an internal volume of 36 liters, and SO was used as a harmful substance.
x was introduced with a syringe and saturated adsorption was performed, and then the concentration of SOx contained in the closed container was adjusted to 15 ppm and 1 mW / c.
It was irradiated with a black light having an intensity of m ² . After 20 hours, when the concentration of SOx contained in the closed container was examined by gas chromatography, the concentration of SOx was 0.7 ppm.
The deodorizing effect was similar to that of the adsorbent prepared by directly using the anatase-type titania particles whose surface was not covered with calcia. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, the adsorbent produced using the anatase type titanium oxide that does not coat the ceramics inert to light as it is Although it gradually shattered, when the above-mentioned functional adsorbent was used, almost no change was observed and no deterioration in performance was observed.

Example 8 Simulated body fluid (Na ⁺ 147 mM, K ⁺ 5 mM, Ca ²⁺ 2.
^{5mM, Mg 2+ 1.5mM, Cl -} 147mM, HCO
_{^{3 - 4.2mM, HPO 4 2- 1.0mM}} , SO4 2-0.
Particle size of about 20 nm in 500 ml)
Of the brookite-type titania particles were added, dispersed by ultrasonic waves, and allowed to stand at 80 ° C. to obtain composite particles in which hydroxyapatite was supported on the surface of the titania particles in an island shape. After the particles were dispersed in water, activated carbon was dipped and dried to obtain activated carbon colored in blue. The deodorizing effect of the obtained functional adsorbent was examined as follows.

That is, 5 g of the above functional adsorbent was placed in a closed container having an internal volume of 36 liters, and SO was used as a harmful substance.
x was introduced with a syringe to saturate the adsorption, and then the concentration of ammonia contained in the closed container was adjusted to 120 ppm to 1 m.
It was irradiated with light of black light having an intensity of W / cm ² . Two
After 0 hours, when the concentration of ammonia contained in the closed container was examined by gas chromatography, the concentration of ammonia decreased to 2 ppm, and the brookite-type titania particles whose surface was not covered with hydroxyapatite were used as they were. A deodorizing effect equivalent to that of the produced adsorbent was obtained. In addition, as a result of conducting an accelerated deterioration test using a carbon arc lamp in order to investigate the durability, the adsorbent produced using the brookite-type titanium oxide that does not coat the ceramics inert to light is Although it gradually shattered, when the above-mentioned functional adsorbent was used, almost no change was observed and no deterioration in performance was observed. Similar effects were obtained also with a functional adsorbent exhibiting a blue color in which activated carbon was loaded with composite particles in which ferrite, titanium phosphate, iron oxide, gypsum, etc. were supported on the surface of titania particles in an island shape.

[0031]

As described in detail above, the present invention not only absorbs bad odors and harmful substances in the air, but also decomposes and detoxifies them to remove the environment effectively and economically. The present invention relates to a novel functional adsorbent that can be safely performed, and has excellent properties in terms of durability, and a method for producing the same, and the titania used in the present invention can be used in paints, cosmetics, toothpaste, etc. It is also used as a food additive and is recognized as a food additive. It has many advantages such as low cost, excellent weather resistance and durability, nontoxicity and safety. The functional adsorbent of the present invention, the titania particles are supported on the porous material, the surface of the titania particles is coated in an island shape by the ceramics inert as the photocatalyst, or the surface of the titania particles is a photocatalyst with holes. Is partially covered by being covered with an inactive ceramics film, and the titania is partially exposed. Therefore, artificial light or sunlight from a fluorescent lamp, an incandescent lamp, a black light, a UV lamp, a mercury lamp, a xenon lamp, a halogen lamp, a metal halide lamp, etc. is irradiated on the titania, whereby the electrons and holes generated in the titania are emitted. Oxidizing and reducing effects pollute the environment such as malodors adsorbed by the porous material of the base material, tobacco smoke, harmful substances in the air such as NOx and SOx, or organic solvents and pesticides dissolved in water. In addition to decomposing organic compounds, it is possible to efficiently purify the living environment by preventing hospital infections due to MRSA and preventing stains.

Alumina, silica, zirconia,
Efficiently adsorbs organic compounds polluting the environment by the adsorption action of ceramics that are inert as photocatalysts such as zirconium titanate, magnesia, calcia, calcium phosphate, titanium phosphate, iron oxide, ferrite, gypsum, and amorphous titania. In addition, as the titania particles, when platinum or rhodium, ruthenium, palladium, silver, copper, iron, or zinc metal is supported on the surface of the titania particles, it is possible to use an organic compound due to its catalytic action. The environmental purification effects such as decomposition / removal effects and antibacterial / antifungal effects are further increased. Moreover, since the portion of the base material such as activated carbon that is in contact with the porous material is a ceramic that is inactive as a photocatalyst, the base material is unlikely to be decomposed and the effect can be maintained for a long time. The functional adsorbent of the present invention is for deodorizing the interior of a car, the living room, the kitchen, the toilet, etc.
It can be applied to a wide range of applications such as wastewater treatment, purification of pool and stored water, effective prevention of fungus and mold growth, and food spoilage, and it is toxic to chemicals and ozone. Since it is sufficient to irradiate light such as electric light or natural light without using any substance, it can be used at low cost, energy saving, safely, and maintenance-free for a long time. Also, when activated carbon is used as the porous material, an activated carbon product colored in blue is obtained,
It has a remarkable decorative effect.

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Claims (11)

[Claims] 1. A functional adsorbent characterized in that a porous material carries coated titania particles obtained by partially coating the surfaces of the titania particles with a light-inert ceramic. 2. The light-inert ceramics are alumina, silica, zirconia, zirconium titanate, magnesia, calcia, calcium phosphate, titanium phosphate,
The functional adsorbent according to claim 1, which is at least one ceramic selected from iron oxide, ferrite, gypsum, and amorphous titania. 3. A titania particle in which the titania particle has at least one metal selected from platinum, rhodium, ruthenium, palladium, silver, copper, iron, and zinc carried on the surface of the titania particle. The functional adsorbent according to claim 1, which is present. 4. The porous material is activated carbon, foamed plastics, glass fiber molded body, synthetic fiber molded body, FRP molded body, plastics-inorganic composite molded body, fiber molded body, activated alumina, zeolite, glass porous body. , Porous metal,
The functional adsorbent according to claim 1, which is at least one selected from a ceramics porous body, a clay molded body, and an inorganic layered compound molded body. 5. The crystal form of the titania particles is anatase or brookite.
The functional adsorbent described. 6. The coated titania particles obtained by partially coating the surface of the titania particles with a light-inert ceramics are dispersed in a solvent, and then coated on a porous material and dried. A method for producing a functional adsorbent. 7. The light-inert ceramics are alumina, silica, zirconia, zirconium titanate, magnesia, calcia, calcium phosphate, titanium phosphate,
7. The method for producing a functional adsorbent according to claim 6, which is at least one ceramic selected from iron oxide, ferrite, gypsum, and amorphous titania. 8. The titania particles have at least one metal selected from platinum, rhodium, ruthenium, palladium, silver, copper, iron and zinc carried on the surface of the titania particles. The method for producing a functional adsorbent according to claim 6. 9. The porous material is selected from activated carbon, foamed plastics, fiber moldings, activated alumina, zeolite, glass porous bodies, metal porous bodies, ceramics porous bodies, clay molded bodies, and inorganic layered compound molded bodies. 7. The method for producing a functional adsorbent according to claim 6, which is at least one selected. 10. The method for producing a functional adsorbent according to claim 6 or 8, wherein the crystal form of the titania particles is anatase or brookite. 11. An environment characterized by containing a functional adsorbent comprising a porous material carrying coated titania particles obtained by partially coating the surface of titania particles with a light-inert ceramics. Purification products.