WO2005047185A1 - Photocatalyst composition and preparing method thereof - Google Patents
Photocatalyst composition and preparing method thereof Download PDFInfo
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- WO2005047185A1 WO2005047185A1 PCT/KR2003/002546 KR0302546W WO2005047185A1 WO 2005047185 A1 WO2005047185 A1 WO 2005047185A1 KR 0302546 W KR0302546 W KR 0302546W WO 2005047185 A1 WO2005047185 A1 WO 2005047185A1
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- WIPO (PCT)
- Prior art keywords
- photocatalyst
- sol
- solution
- preparing
- titanium dioxide
- Prior art date
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000203 mixture Substances 0.000 title claims abstract description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 9
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 239000011669 selenium Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 6
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 239000011230 binding agent Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000012153 distilled water Substances 0.000 description 7
- 230000035943 smell Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- -1 NaHC0 Chemical compound 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 229910016003 MoS3 Inorganic materials 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009635 antibiotic susceptibility testing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 125000001905 inorganic group Chemical group 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052961 molybdenite Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- TVWWSIKTCILRBF-UHFFFAOYSA-N molybdenum trisulfide Chemical compound S=[Mo](=S)=S TVWWSIKTCILRBF-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/057—Selenium or tellurium; Compounds thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/057—Selenium or tellurium; Compounds thereof
- B01J27/0573—Selenium; Compounds thereof
-
- B01J35/39—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Catalysts (AREA)
Abstract
The present invention relates to a method for preparing a photocatalyst composition which is comprised of following steps: adding base to water solution of titanium isopropoxide and discarding supernatant ; adding acid to the obtained solution and stirring , adding base to neutralize solution, adding selenium sol to the resulting titanium dioxide sol and mixing; and heating mixed sol for drying.
Description
PHOTOCATALYST COMPOSITION AND PREPARING
METHOD THEREOF
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a photocatalyst composition and a preparing method thereof which have an excellent photocatalyst function even in a natural light and indoor light.
2. Description of the Background Art When a light having energy above band gap is irradiated to a metallic material having a semiconductor property, oxidation and reduction reactions occur in surrounding organic compounds. Here, a photocatalyst material having a property of semiconductor is referred to as a photocatalyst agent. For obtaining the above photocatalyst, there is a method in which a photocatalyst is carried on a substrate using a refractory binding agent by adapting a high molecule as a supporter. Another method is characterized in which a photocatalyst powder is adhered to a substrate of a fluorine group polymer or a silicon polymer and silicon sol of an inorganic group by binder. And, there is a method in which a photocatalyst is obtained from a metallic oxide sol as a carrier of a photocatalyst powder. Recently, an applicable range of the photocatalyst is sharply increased. Namely, the above photocatalyst is adapted in home, office and various industrial fields. The use of the photocatalyst is rapidly spread. Photocatalyst is used for decomposition of harmful substances to a human body and bad smells. It is also used for prevention of sliding in a public bath
room, removal of smell component, purification of indoor air, removal of bad smell in the interior of a vehicle, or prevention of bacteria propagation in a food factory, etc. However, it is needed to implement the properties that photocatalyst particles are strongly adhered on a substrate, maintaining an inherent function of the photocatalyst and a long time efficacy of the same. In the case that an organic high molecule is adapted as a supporter of a photocatalyst, a semiconductor photocatalyst may receive a certain energy level above the energy of the band gap, so that the organic materials may be continuously and gradually oxidized and decomposed. Therefore, the efficacy of the same is very short, and it is impossible to implement a desired effect, so that a consumer is not satisfied. In addition, when rutile type photocatalyst or anatase type photocatalyst is coated on a substrate by spray or brush method using an organic group as a binder and inorganic silicon group polymer as a supporter and dried thereon, a certain crack may occur due to the binding of particles during a drying process or the surface of the catalyst may be rough.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a photocatalyst composition and a manufacturing method thereof which overcome the problems encountered in the conventional art. It is another object of the present invention to provide a photocatalyst composition and a manufacturing method thereof which are capable of implementing a strong adhering force on the surface of a substrate without damaging the particles of a photocatalyst and the inherent functions of a photocatalyst. It is another object of the present invention to provide a photocatalyst
composition and a manufacturing method thereof which are capable of implementing a long time efficacy of the photocatalyst. To achieve the above objects, there is provided a method for preparing a photocatalyst composition which is comprised of following steps: adding base to water solution of titanium isopropoxide and discarding supernatant ; adding acid to the obtaind solution and stirring , adding base to neutralize solution, adding selenium sol to the resulting titanium dioxide sol and mixing; and heating mixed sol for drying. In the present invention, it is possible to implement a uniform thin film coating process having a desired adherence without crystallization by a titanium dioxide and a crack during a drying process. Layers are separated by neutralization using an alkali property contained in NaOH, KOH, NaHC0 , ammonia water, etc. in a titanium aqueous solution like Ti((OCH ((^3)2)4, as a layer separation agent of a photocatalyst sol adapted in the present invention. Here, a separated supernatant has a base component. The supernatant is washed multiple times using distilled water thus discarding a base. The distilled water is added 1 or 3 times based on the volume of a precipitated agent, and a solid value is obtained based on the added amount of the distilled water. Here, HN03 solution is slowly added by 1 ,000ppm(0.1%) and is strongly agitated by high-speed agitator for 30 minutes thus obtaining pH of 1-2. In order to adjust color and pH of neutrality, NaOH, KOH, NaHC03, or ammonia water may be added in an aqueous solution within a range of 0.2% thus obtaining a neutral pH of 7-8. The obtained material is heated at above 100°C for more than 30 minutes, and then the crystal titanium dioxide sol of the anatase type is obtained. The photocatalyst is coated on a ceramic and is dried and heated
to 400°C. As a result, the titanium dioxide of the anatase type is obtained. At this time, the titanium dioxide sol of the anatase type has a grain diameter of below 5-20nm, and pH is 7-8, and the outer appearance is white transparent color. As a component of the binder adapted in the present invention, there are Se, Co, Ce03, Ta205, Ru02, InPb, MoS3) MoS2, Sa02, Zno, SrTi03, CdS, CdO, CaP, Ti02, Si02, SiC, Ca, Fe, Mn, Mg, etc. Among the above components, a transparent selenium sol has an excellent adherence on the surface.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiments and references of the present invention will be described in detail. The scope of the present invention is not limited to the following examples.
[Example 1] Preparation of titania sol
In a high speed agitator, a distilled water of 12L was added to Titanium isopropoxide of 1kg, agitating for 10min and white solution was obtained. 300ml of NaOH solution (40%, supplied by Yongjin chemical corporation) was added and stirred for 5min at the speed of 60rpm. After confirming the layer was separated, the water residing in the upper layer of the solution was discarded. Supernatant was fully washed with silver nitrate solution of 1mol until chlorine contained in the supernatant was not detected thus obtaining 2,000ml of gel. The resultant solution was diluted with nitric acid (70%) supplied by Dongyang chemical corporation, and a solid value was freely controlled
based on the ratio of the diluted nitric solution, thus obtaining a stable aqueous dispersion of about 5,000ml which has at least 10% of solid value.
[Example 2] Preparation of inorganic binder A distilled water of 30ml was added to a solution of a nitric acid (70% ) of 100 ml supplied by Dongyang chemical corporation thus preparing diluted HN03 solution. Se of 13g was added to diluted HN03. The resultant solution was neutralized with KOH (30%) solution supplied by Duksan chemical corporation, and pH was adjusted to 8-9. The pH was fixed at 7.5-8 using lactic acid for preventing a layer separation, and the solid value was adjusted using distilled water. It was preferred that the solid component does not exceed 3% of the solid content of photocatalyst when it is used as a binder for a photocatalyst according to the present invention.
[Example 3] Preparation of photocatalyst composition The inorganic binder prepared by the example 2 was mixed with a photocatalyst and was heated at below 100°C within 10 minutes thus preparing an anatase type titanium dioxide. The photocatalyst sol of transparent white color was obtained.
[Experimental example 1] The decomposition force test for the organic materials of the photocatalyst sol of the example 3 including the inorganic binder was implemented based on the following methods. A cubic box was formed by plastic material in size of 2m3. A 20W UV fluorescent light was attached to each rectangular corner of the box. A bad smell gas (for example, ammonia, SOx, NOx, etc.) of 2,000ppm was injected into the box one time for every
one minute for 24 hours totally 1 ,440 times using a pump. Photocatalyst sol containing inorganic binder was injected for 1 minute by 10CC using an air spray gun by a compressor for removing particles of the bad smell gas. Thereafter, a smell removing ability was checked one time for every hour. As a result of the above processes for researching and checking the efficiency of the removal of the bad smell gas, photocatalyst sol containing inorganic binder was proved to be capable of decomposing organic materials completely only in 1 minute.
[Experimental example 2] The decrease rate of the bacteria was checked with respect to the strain 1 of Staphylococcus aureus having an initial number of bacteria of 1.3x106 after 24 hours based on FC-TM-20 in the antimicrobial susceptibility test. As a result of the check, an extinction ability of 99.9% was obtained. In addition, the decrease rate of the bacteria was checked with respect to the strain 2 of the Escherichia coli having an initial number of bacteria of 1.5x104 after 24 hours based on the same manner. As a result of the check, an extinction ability of 99.9% was obtained.
[Experimental example 3] A photocatalyst sol was adjusted to solid value of 1% using distilled water and was fully diluted and sprayed on a transparent glass test sample having a dimension of 10cmx5.5cmx5cm using a spray, so that a coating layer having a thickness of 1μm~2μm was formed thereon. Thereafter, an adhering strength test was performed with respect to the resultant coating layer under a natural environment at a room temperature through 200°C.
[Adhering strength test 1] A photocatalyst having water was placed indoor at a room temperature of 15°C for 2 hours. The water contained in the photocatalyst was fully evaporated. It was visually checked that a rainbow was outputted from a glass test sample coated with a photocatalyst, viewing the same in a lateral direction. In addition, the strength of the glass test sample coated with the photocatalyst was tested using a 4H pencil. As a result of the test, there was not any scratch on the glass test sample.
[Adhering strength test 2] The above glass test sample was coated using a spray at a room temperature, and water contained in the glass test sample was evaporated at a temperature of 50°C. The strength of the glass test sample coated with a photocatalyst was tested using a 4H pencil. As a result of the test, there was not any scratch on the glass test sample.
[Adhering strength test 3] The glass test sample was coated using a spray at a room temperature, and water contained in the glass test sample was evaporated for 5 minutes at a temperature of 50°C and was heated for 10 minutes at a temperature of 100°C. The strength of the glass test sample coated with the photocatalyst was tested using a 4H pencil. As a result of the test, there was not any scratch on the glass test sample. In order to test the adherence of the photocatalyst on the surface, the strength of the glass test sample coated with the photocatalyst was tested using a 4H pencil. As a result of the test, there was not any scratch on the surface of the same. In addition, the glass test sample coated with the photocatalyst was rubbed 50 times with a
common towel using a neutral detergent having a density of 1.OOOpprn for performing an adhesive force test on the surface. As a result of the test, it was possible to obtain the same result as the original state.
[Experimental example 4] In order to perform a storing property test with respect to a photocatalyst sol having an inorganic binder, the photocatalyst sol was inputted into an ample bottle having a volume of 100CC by 50CC and was frozen in a freezing room of a common environment for 24 hours at -5°C. A resultant sol was placed at a room temperature for 3 hours. Thereafter, the state of the recoupling of the nano-size particles was visually checked. The conventional local products and conventional Japanese products each having pH value of 7-8 were frozen or defrozen. As a result of the above process, when the particles were recoupled, the products were damaged, so that there was not any value as a product. However, in the case of the products according to the present invention, when it was frozen and defrozen multiple times, it was possible to visually check no changes in the products. Therefore, even when the products according to the present invention are frozen by mistake during the transportation of the products, there will be no problems in the products. Hence, it is possible to sell and use the products without any damages. As described above, in the preparing method of the present invention, it is possible to prepare a photocatalyst composition having a good adhering property, spreading property, durability, cold-resistant property, etc. when coating on a surface of a thing without decreasing an inherent function of a photocatalyst. As the present invention may be embodied in several forms without
departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims
What was claimed is: 1. A method for preparing a photocatalyst composition which is comprised of following steps: adding base to water solution of titanium isopropoxide and discarding supernatant ; adding acid to the obtaind solution and stirring , adding base to neutralize solution, adding selenium sol to the resulting titanium dioxide sol and mixing; and heating mixed sol for drying.
2. The method of claim 1, wherein the amount of said solid selenium is below 3% of the solid titanium dioxide photocatalyst.
3. The method of claim 1 , wherein mixed sol is heated for 10 - 60 minutes at 100°C for drying.
4. A method for preparing a titania sol which is comprised of following steps: adding base to water solution of titanium isopropoxide and discarding supernatant ; adding acid to the obtaind solution and stirring , adding base to neutralize solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003282430A AU2003282430A1 (en) | 2003-11-14 | 2003-11-25 | Photocatalyst composition and preparing method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0080447 | 2003-11-14 | ||
| KR1020030080447A KR100611632B1 (en) | 2003-11-14 | 2003-11-14 | photocatalyst composition and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005047185A1 true WO2005047185A1 (en) | 2005-05-26 |
Family
ID=34587904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2003/002546 WO2005047185A1 (en) | 2003-11-14 | 2003-11-25 | Photocatalyst composition and preparing method thereof |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100611632B1 (en) |
| AU (1) | AU2003282430A1 (en) |
| WO (1) | WO2005047185A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453165C (en) * | 2006-06-02 | 2009-01-21 | 安徽大学 | Nanometer titanium dioxide/selenium dioxide composition and its prepn. method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6121191A (en) * | 1996-09-20 | 2000-09-19 | Teruo Komatsu | Ultrafine metal particle carrying photocatalyst, highly function material loaded with the photocatalyst, and method of manufacturing them |
| JP2001130912A (en) * | 1999-11-01 | 2001-05-15 | Noevir Co Ltd | Porous titanium oxide, method for producing the same, and cosmetic containing the same |
| JP2001246247A (en) * | 2000-03-08 | 2001-09-11 | Mitsubishi Heavy Ind Ltd | Method for producing photocatalyst |
| US20020045545A1 (en) * | 1999-08-12 | 2002-04-18 | Sumitomo Chemical Company, Limited | Porous titania, catalyst comprising the porous titania |
| US6420437B1 (en) * | 1998-01-27 | 2002-07-16 | Nihon Parkerizing Co., Ltd. | Titanium oxide colloidal sol and process for the preparation thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62207718A (en) * | 1986-03-06 | 1987-09-12 | Taki Chem Co Ltd | Sol of crystalline titanium oxide and its preparation |
| DE4431788A1 (en) * | 1994-09-07 | 1996-03-14 | Huels Chemische Werke Ag | Catalyst and process for the decomposition of HCN in gases |
| KR100421243B1 (en) * | 2000-12-01 | 2004-03-12 | (주) 에이엔티케미칼 | The fabrication method of highly crystalline and dispersive photocatalyst of anatase-type titanium oxidesol by way of hydrothermal treatment |
| US20050079977A1 (en) * | 2002-01-15 | 2005-04-14 | Kwang-Soo Choi | Liquid composition for promoting plant growth, which includes nano-particle titanium dioxide |
| KR20040107315A (en) * | 2003-06-13 | 2004-12-20 | 주식회사 씨피씨 | photocatalyst composition and manufacturing method thereof |
-
2003
- 2003-11-14 KR KR1020030080447A patent/KR100611632B1/en not_active IP Right Cessation
- 2003-11-25 AU AU2003282430A patent/AU2003282430A1/en not_active Abandoned
- 2003-11-25 WO PCT/KR2003/002546 patent/WO2005047185A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6121191A (en) * | 1996-09-20 | 2000-09-19 | Teruo Komatsu | Ultrafine metal particle carrying photocatalyst, highly function material loaded with the photocatalyst, and method of manufacturing them |
| US6420437B1 (en) * | 1998-01-27 | 2002-07-16 | Nihon Parkerizing Co., Ltd. | Titanium oxide colloidal sol and process for the preparation thereof |
| US20020045545A1 (en) * | 1999-08-12 | 2002-04-18 | Sumitomo Chemical Company, Limited | Porous titania, catalyst comprising the porous titania |
| JP2001130912A (en) * | 1999-11-01 | 2001-05-15 | Noevir Co Ltd | Porous titanium oxide, method for producing the same, and cosmetic containing the same |
| JP2001246247A (en) * | 2000-03-08 | 2001-09-11 | Mitsubishi Heavy Ind Ltd | Method for producing photocatalyst |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453165C (en) * | 2006-06-02 | 2009-01-21 | 安徽大学 | Nanometer titanium dioxide/selenium dioxide composition and its prepn. method |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003282430A8 (en) | 2005-06-06 |
| KR100611632B1 (en) | 2006-08-11 |
| AU2003282430A1 (en) | 2004-06-06 |
| KR20050046846A (en) | 2005-05-19 |
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