WO2014073727A1 - 티타늄결핍형 암염구조 티타늄 산질화물 및 그 제조방법 - Google Patents
티타늄결핍형 암염구조 티타늄 산질화물 및 그 제조방법 Download PDFInfo
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- WO2014073727A1 WO2014073727A1 PCT/KR2012/009829 KR2012009829W WO2014073727A1 WO 2014073727 A1 WO2014073727 A1 WO 2014073727A1 KR 2012009829 W KR2012009829 W KR 2012009829W WO 2014073727 A1 WO2014073727 A1 WO 2014073727A1
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- titanium
- oxynitride
- deficient
- salt structure
- salt
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- 239000010936 titanium Substances 0.000 title claims abstract description 212
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 183
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 183
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000006735 deficit Effects 0.000 title abstract 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- 230000002950 deficient Effects 0.000 claims description 65
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 52
- 150000003839 salts Chemical group 0.000 claims description 43
- 239000007789 gas Substances 0.000 claims description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 28
- 239000001301 oxygen Substances 0.000 claims description 28
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 16
- 230000007812 deficiency Effects 0.000 claims description 14
- 150000003608 titanium Chemical class 0.000 claims description 9
- 238000003776 cleavage reaction Methods 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 6
- 230000007017 scission Effects 0.000 claims description 6
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000002105 nanoparticle Substances 0.000 claims description 4
- QDZRBIRIPNZRSG-UHFFFAOYSA-N titanium nitrate Chemical compound [O-][N+](=O)O[Ti](O[N+]([O-])=O)(O[N+]([O-])=O)O[N+]([O-])=O QDZRBIRIPNZRSG-UHFFFAOYSA-N 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 3
- 239000011941 photocatalyst Substances 0.000 abstract description 8
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 24
- 230000001699 photocatalysis Effects 0.000 description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 5
- 229960000907 methylthioninium chloride Drugs 0.000 description 5
- KELHQGOVULCJSG-UHFFFAOYSA-N n,n-dimethyl-1-(5-methylfuran-2-yl)ethane-1,2-diamine Chemical compound CN(C)C(CN)C1=CC=C(C)O1 KELHQGOVULCJSG-UHFFFAOYSA-N 0.000 description 5
- 238000006303 photolysis reaction Methods 0.000 description 5
- 235000002639 sodium chloride Nutrition 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 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 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000001683 neutron diffraction Methods 0.000 description 3
- 238000001782 photodegradation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000000608 laser ablation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003991 Rietveld refinement Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001725 laser pyrolysis Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- IPHGLJZNKVGPPA-UHFFFAOYSA-N pyrimidine titanium Chemical compound [Ti].N1=CN=CC=C1 IPHGLJZNKVGPPA-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- -1 titanium oxide nitride Chemical class 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
- C01B21/0821—Oxynitrides of metals, boron or silicon
-
- 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
- B01J27/24—Nitrogen compounds
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- 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
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/30—Three-dimensional structures
- C01P2002/32—Three-dimensional structures spinel-type (AB2O4)
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
Definitions
- the present invention relates to a titanium oxynitride and a method of manufacturing the same, and more particularly, to a titanium-deficient salt-type titanium oxynitride having improved photocatalytic properties in a visible light region and a method for producing the same.
- Titanium dioxide (TiO 2 ) is a semiconducting metal oxide that is extremely stable physico-chemically, similar to other metal oxides, and has a band gap energy of about 3.2 eV. Fiber and medical fields.
- the nanoporous porous body exhibits excellent physical properties because it has a regular pore arrangement and a wide specific surface area. Therefore, it can be applied to various fields such as photocatalyst, dye-sensitized solar cell (DSSCs) .
- DSSCs dye-sensitized solar cell
- titanium dioxide well known as a photocatalyst, has poor photocatalytic properties in the visible wavelength region because the band gap energy is more than 3 eV.
- titanium monoxide has a band gap energy of about 2.0 eV, which can absorb the wavelength of visible light.
- Titanium monoxide (TiO) can have a salt structure. Titanium monoxide (TiO) is a stable material at 1250 ° C or higher. Since monoclinic is stable at room temperature, conventionally, it is maintained at a high temperature for a long time, And the like. Titanium oxide monoxide (TiO), which is a salt structure, can be prepared by laser ablation in distilled water, mechanochemical synthesis using titanium metal and titanium dioxide (TiO 2 ), or titanium precursor titanium isopropoxide and laser prolysis of non-equilibrium process. However, titanium oxide monoxide (TiO), which is produced by the non-equilibrium process by applying such instantaneous energy, is weak in stability.
- the present invention relates to a titanium-deficient salt structure titanium oxynitride (Ti 1-x O 1-y N y , where x and y are real numbers), wherein x representing the degree of titanium deficiency is greater than 0 and less than 1, Y < / RTI > is greater than 0 and less than 1, to provide a titanium oxynitride having a titanium-deficient salt structure.
- the titanium-deficient salt-type titanium oxynitride has a vacancy formed in a titanium salt site of rock salt structure as much as titanium is deficient. Nitrogen bonds with titanium and substitutes oxygen in the site of oxygen in the salt structure exist.
- the titanium-deficient salt structure titanium oxynitride has a ⁇ 111 ⁇ cleavage plane.
- the titanium-deficient salt structure titanium oxynitride is composed of a hollow nanoparticle having hollow interior.
- the oxidized surface of the titanium salt of the salt structure has a range of more than +2 and less than +3, and the oxidized surface of the oxygen atom of the salt structure has a range of more than -3 and less than -2.
- the titanium-deficient salt-structure titanium oxynitride has a lower band gap energy than titanium dioxide (TiO 2 ).
- the present invention is titanium dioxide (TiO 2) a step that while heating the stage and the furnace for charging the furnace flowing a gas containing nitrogen into the furnace wherein the titanium dioxide (TiO 2) the contents, the titanium As the reduction of the oxide (TiO 2 ) occurs, a vacancy is formed in the titanium salt of the rock salt structure due to lack of titanium, and nitrogen is formed in the oxygen site of the rock salt structure while replacing oxygen, And cooling the furnace to obtain a titanium oxynitride, wherein the obtained titanium oxynitride is a titanium-deficient salt structure titanium oxynitride (Ti 1 - x O 1 - y N y , where x and y are real numbers) , X representing the degree of titanium deficiency is greater than 0 and less than 1, y representing the degree of introduction of nitrogen is greater than 0 and less than 1, a titanium deficient salt structure titanium oxynitride Of the present invention.
- the temperature in the furnace is maintained at 600 to 1000 ⁇ ⁇ by the heating.
- the gas containing nitrogen may be NH 3 or N 2 , and the gas containing nitrogen may be supplied into the furnace at a flow rate of 0.01 to 10 cc / min.
- the gas containing nitrogen may be formed of a mixed gas of NH 3 and N 2, the mixed gas is NH 3 and N 2 is 0.1 to 50: may be a gas mixed at a weight ratio of 50 to 99.9, the The mixed gas is preferably fed into the furnace at a flow rate of 0.01 to 10 cc / min.
- titanium-deficient salt-type titanium oxynitride having improved photocatalytic properties in a visible light region.
- the titanium-pyrimidine type salt of titanium oxynitride produced according to the present invention has a lower band gap energy than titanium dioxide (TiO 2 ) used in photocatalysts or dye-sensitized solar cells and can absorb wavelengths in the visible region.
- the process for producing titanium oxynitride according to the present invention is simple in process and high in reproducibility.
- FIG. 1 is a view showing the results of performing neutron diffraction analysis to confirm the structure and components of the titanium-deficient salt-type titanium oxynitride produced according to Example 1.
- FIG. 1 is a view showing the results of performing neutron diffraction analysis to confirm the structure and components of the titanium-deficient salt-type titanium oxynitride produced according to Example 1.
- FIGS. 2 and 3 show results of X-ray photoelectron spectroscopy (XPS) analysis for confirming the bonding between atoms in the titanium-deficient salt-type titanium oxynitride produced according to Example 1
- XPS X-ray photoelectron spectroscopy
- FIG. 4 is a transmission electron microscope (TEM) photograph of the titanium-deficient salt-structure titanium oxynitride produced according to Example 1.
- TEM transmission electron microscope
- FIG. 5 is a high-resolution transmission electron microscope photograph of the titanium-deficient salt-structure titanium oxynitride produced according to Example 1.
- FIG. 5 is a high-resolution transmission electron microscope photograph of the titanium-deficient salt-structure titanium oxynitride produced according to Example 1.
- FIG. 6 is a graph showing the photodegradation characteristics of methylene blue in order to confirm the photocatalytic properties of the titanium-deficient salt-type titanium oxynitride produced according to Example 1.
- FIG. 6 is a graph showing the photodegradation characteristics of methylene blue in order to confirm the photocatalytic properties of the titanium-deficient salt-type titanium oxynitride produced according to Example 1.
- FIG. 7 is a graph showing the results of X-ray diffraction (XRD) analysis of the titanium-deficient salt-structure titanium oxynitride after completion of the photolysis reaction for 3 hours, before and after the photodegradation reaction.
- XRD X-ray diffraction
- the titanium-deficient salt-structure titanium oxynitride according to the preferred embodiment of the present invention is a titanium-deficient salt-structure titanium nitride (Ti 1-x O 1-y N y , where x and y are real numbers) X is greater than 0 and less than 1, and y, which represents the degree of introduction of nitrogen, is greater than 0 and less than 1.
- a method for preparing titanium oxynitride having a titanium-deficient salt structure includes the steps of charging titanium dioxide (TiO 2 ) into a furnace and heating the furnace while heating the titanium dioxide (TiO 2 ) (TiO 2 ) is reduced, vacancy is formed in the titanium salt of the rock salt structure due to the deficiency of titanium, and as the oxygen is substituted, the rock salt Forming nitrogen in the oxygen sites of the structure to form a bond with titanium and cooling the furnace to obtain a titanium oxynitride, wherein the obtained titanium oxynitride is a titanium-deficient salt structure titanium oxynitride (Ti 1 - x O 1 -y N y , where x and y are real numbers), wherein x representing the degree of titanium deficiency is greater than 0 and less than 1, Y is greater than 0 and less than 1.
- Titanium dioxide (TiO 2 ) which is well-known as a photocatalyst, has poor photocatalytic properties in the visible light region because the band gap energy is about 3.2 eV.
- nitrogen (N) with titanium dioxide (TiO 2 ) to form a mixed electron orbit of O 2 p and N 2 p in order to improve the photocatalytic property of the visible light region.
- nitrogen (N) is doped in titanium dioxide (TiO 2 )
- titanium (Ti) which is a transition metal, forms various oxides by binding with oxygen.
- TiO 2 titanium dioxide
- TiO 2 titanium oxide
- Ti n O n + 1 Ti > 1).
- Titanium dioxide (TiO 2 ) which is used in photocatalysts and dye-sensitized solar cells, has a bandgap energy of 3 eV or more, which causes poor photocatalytic properties in the visible region.
- titanium oxide (TiO 2 ) And has a band gap energy of about 2.0 eV.
- Titanium monoxide (TiO) can have a salt structure, and the lattice constant at this time is 4.18 ⁇ , which is almost similar to the lattice constant of 4.24 ⁇ of titanium nitride (TiN) having a salt structure. Therefore, when nitrogen is introduced into titanium oxide monoxide (TiO) in salt form, it is expected to form titanium nitrate in salt form.
- titanium oxide monoxide which is a rock salt structure
- TiO titanium oxide monoxide
- TiO 2 titanium dioxide
- non-equilibrium process such as a laser prolysis method of titanium isopropoxide, or the like.
- Simon et al. For example, prepared titanium oxide monoxide (TiO), a nitrogen salt-introduced titanium oxide by laser pyrolysis, and measured the photocatalytic properties.
- TiO titanium oxide monoxide
- a nitrogen salt-introduced titanium oxide by laser pyrolysis and measured the photocatalytic properties.
- Titanium oxide monoxide (TiO), which is produced by an equilibrium process rather than a non-equilibrium process, has not been known until now. Especially, nitrogen-introduced titanium deficient salt-type titanium monoxide (TiO) is not known.
- the invention photocatalytic property is excellent titanium deficient type rock salt structure of titanium oxynitride (Ti 1 in the visible region - x O 1 - and y N y, where 0 ⁇ x ⁇ 1, 0 ⁇ y is ⁇ 1, x and y are real (TiO 2 ) is reduced by heating in a nitrogen-containing gas atmosphere to produce a titanium-deficient salt-structure titanium oxynitride.
- a thermal equilibrium process is used to produce a titanium-deficient salt-structure titanium oxynitride.
- Titanium deficiency type rock salt structure titanium oxynitride Ti 1-x O 1-y N y , where x and y are real numbers
- x representing the degree of titanium deficiency is larger than 0 and smaller than 1
- y Is greater than zero and less than one.
- the titanium-deficient salt-type titanium oxynitride has a vacancy formed in a titanium salt site of rock salt structure as much as titanium is deficient. Nitrogen bonds with titanium and substitutes oxygen in the site of oxygen in the salt structure exist.
- Titanium-deficient rock salt structure In titanium oxynitride (Ti 1-x O 1-y N y ), x representing the degree of titanium deficiency is greater than 0 and less than 1 (0 ⁇ x ⁇ 1, x is a real number). Titanium-deficient rock salt structure Titanium deficiency in titanium oxynitides forms a vacancy in titanium sites in the rock salt structure as much as titanium deficiency.
- y representing the degree of introduction of nitrogen in the titanium oxynitride having the titanium-deficient salt structure is larger than 0 and smaller than 1 (0 ⁇ y ⁇ 1, y is a real number).
- Titanium-deficient rock salt structure In titanium oxynitride, nitrogen is bound to titanium, and nitrogen exists in a form that substitutes oxygen at the site of oxygen in the salt structure.
- the titanium-deficient salt structure titanium oxynitride is composed of hollow nanoparticles having a ⁇ 111 ⁇ cleavage plane and hollow interior.
- the oxidized surface of the titanium salt of the salt structure has a range of more than +2 and less than +3, and the oxidized surface of the oxygen atom of the salt structure has a range of more than -3 and less than -2.
- the titanium-deficient salt-type titanium oxynitride has a band gap energy lower than that of titanium dioxide (TiO 2 ) and absorbs the wavelength of the visible light region, so that the photocatalyst characteristic in the visible light region is superior to titanium dioxide (TiO 2 ).
- Titanium-deficient salt structure Titanium oxynitride can be produced by reducing titanium dioxide (TiO 2 ) by heating in a gas atmosphere containing nitrogen.
- the nitrogen-containing gas atmosphere may be a single component gas containing NH 3 , N 2 , or the like or a mixture thereof.
- a method for preparing titanium oxynitride having a titanium-deficient salt structure includes the steps of charging titanium dioxide (TiO 2 ) into a furnace and heating the furnace while heating the titanium dioxide (TiO 2 ) (TiO 2 ) is reduced, vacancy is formed in the titanium salt of the rock salt structure due to the deficiency of titanium, and as the oxygen is substituted, the rock salt Forming nitrogen in the oxygen sites of the structure to bond with titanium, and cooling the furnace to obtain titanium oxynitride.
- the obtained titanium oxynitride is a titanium-deficient salt structure titanium oxynitride (Ti 1-x O 1-y N y , where x and y are real numbers), x representing the degree of titanium deficiency is larger than 0 and smaller than 1, Y is greater than zero and less than one.
- the temperature in the furnace is maintained at 600 to 1000 ⁇ ⁇ by the heating. If the temperature in the furnace is too low, the nitrogen may penetrate into the titanium dioxide (TiO 2 ) and may not provide sufficient thermal energy to bond with the oxygen at the oxygen site to substitute, and if the temperature in the furnace is too high Can be economical because of the high consumption of thermal energy. It is preferable that the heating is performed for a sufficient time required for the nitrogen to penetrate into the titanium dioxide (TiO 2 ) and to bind with titanium and replace the oxygen at the oxygen site. For example, the heating is preferably performed for 1 to 72 hours. If the heating time is too short, the nitrogen can not penetrate sufficiently into the titanium dioxide (TiO 2 ) and insufficient substitution with oxygen at the oxygen site may occur. If the heating time is too long, it takes a long time, have.
- the gas containing nitrogen may be NH 3 or N 2 , and the gas containing nitrogen may be supplied into the furnace at a flow rate of 0.01 to 10 cc / min.
- the gas containing nitrogen may be formed of a mixed gas of NH 3 and N 2, the mixed gas is NH 3 and N 2 is 0.1 to 50: may be a gas mixed at a weight ratio of 50 to 99.9, the The mixed gas is preferably fed into the furnace at a flow rate of 0.01 to 10 cc / min.
- the tube was heated to 800 ° C at a heating rate of 3 ° C / min, and a mixed gas of NH 3 and N 2 was supplied into the tube at a flow rate of 0.2 cc / min.
- the structure of the titanium-deficient salt-type titanium oxynitride was analyzed through the Rietveld analysis shown in FIG. 1 as a diffraction pattern indicated by a figure 'O' in FIG. 1, Respectively.
- the composition of the titanium-deficient salt-type titanium oxynitride realized in Example 1 was Ti 0 .7 (O 0 .67 N 0 .33 ) 1 .
- 30% of the titanium sites in the rock salt structure are empty, and 67% of the oxygen sites in the rock salt structure are occupied by oxygen and 33% of the oxygen sites are occupied by nitrogen.
- X-ray photoelectron spectroscopy (XPS) analysis was performed to confirm the interatomic bonds in the titanium oxynitride of titanium-deficient salt structure prepared according to Example 1, and the results Respectively.
- the substitution of titanium vacancy and nitrogen in the formation of the salt salt structure titanium oxynitride plays an important role in the structural stability. Therefore, unlike the conventional salt-structure titanium oxynitride produced through the non-equilibrium reaction, the titanium-deficient salt-type titanium oxynitride shown in Example 1 was manufactured under equilibrium conditions through a high-temperature process and exhibited a stable structure .
- FIG. 4 is a transmission electron microscope (TEM) photograph of the titanium-deficient salt-structure titanium oxynitride produced according to Example 1.
- TEM transmission electron microscope
- the titanium-deficient salt-structure titanium oxynitride is shown to be made of hollow nanoparticles with hollow interior.
- FIG. 5 is a high-resolution transmission electron microscope photograph of the titanium-deficient salt-structure titanium oxynitride produced according to Example 1.
- FIG. 5 is a high-resolution transmission electron microscope photograph of the titanium-deficient salt-structure titanium oxynitride produced according to Example 1.
- the titanium oxynitride produced according to Example 1 has a ⁇ 111 ⁇ cleavage plane even though it has a salt structure.
- the ⁇ 111 ⁇ plane of the rock salt structure having strong ionic bond has a polarity, and thus has a large surface energy, and thus has a cleavage plane of ⁇ 001 ⁇ plane, which is a nonpolar plane like a salt crystal.
- the titanium-deficient salt structure titanium oxynitride implemented in Example 1 has ⁇ 111 ⁇ cleavage plane, which indicates that the covalent bonding property is enhanced by the introduction of nitrogen.
- FIG. 6 is a graph showing photolytic characteristics of methylene blue in order to confirm photocatalytic properties of the titanium-deficient salt-type titanium oxynitride produced according to Example 1.
- FIG. As a method for measuring the photodegradation characteristics of methylene blue, a 300 W Xenon arc lamp was used and measured using a 295 nm cut-off filter and a 420 nm cut-off filter.
- Example 2 a study was conducted to compare P25, a representative photocatalyst, Degussa product, and the titanium-deficient salt-form titanium oxide nitride (Ti 0.7 (O 0.67 N 0.33 ) 1 ) prepared according to Example 1
- the titanium-deficient salt-form titanium oxynitride prepared according to Example 1 exhibited superior characteristics to P25 both in the ultraviolet-visible region (> 290 nm) as well as in the visible region (> 420 nm) . This indicates that the bandgap of the titanium-deficient salt-structure titanium oxynitride is suitable for absorbing the wavelength of the visible light region.
- FIG. 7 shows the results of X-ray diffraction (XRD) analysis after recovering the titanium-deficient salt-type titanium oxynitride having undergone the photolysis reaction for 3 hours, before and after the photolysis reaction.
- XRD X-ray diffraction
- the titanium-deficient salt-type titanium oxynitride having improved photocatalytic properties in the visible light region can be produced, and thus it is industrially applicable.
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Abstract
Description
원소 | x 위치 | y 위치 | z 위치 | 자리차지 확률(occupancy) |
Ti | 0.5 | 0.5 | 0.5 | 0.70 |
O | 0 | 0 | 0 | 0.67 |
N | 0 | 0 | 0 | 0.33 |
Claims (10)
- 티타늄결핍형 암염구조 티타늄 산질화물(Ti1-xO1-yNy, x 및 y는 실수)로서,티타늄결핍 정도를 나타내는 x는 0보다 크고 1보다 작으며,질소의 도입 정도를 나타내는 y는 0보다 크고 1보다 작은 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물.
- 제1항에 있어서, 티타늄이 결핍되는 만큼 암염구조의 티타늄 자리에 공공(vacancy)이 형성되어 있고, 질소는 티타늄과 결합을 이루고 암염구조에서 산소 자리에 산소를 치환하는 형태로 존재하는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물.
- 제1항에 있어서, 상기 티타늄결핍형 암염구조 티타늄 산질화물은 {111} 벽개면을 갖는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물.
- 제1항에 있어서, 상기 티타늄결핍형 암염구조 티타늄 산질화물은 내부가 비어있는 할로우 나노입자(hollow nanoparticle)로 이루어진 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물.
- 제1항에 있어서, 암염구조의 티타늄 자리의 산화가는 +2를 초과하고 +3 미만의 범위를 가지며, 암염구조의 산소 자리의 산화가는 -3을 초과하고 -2 미만의 범위를 가지는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물.
- 제1항에 있어서, 상기 티타늄결핍형 암염구조 티타늄 산질화물은 티타늄 이산화물(TiO2) 보다 낮은 밴드갭 에너지를 갖는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물.
- 티타늄 이산화물(TiO2)을 퍼니스에 장입하는 단계;상기 퍼니스를 가열하면서 상기 티타늄 이산화물(TiO2)이 장입된 상기 퍼니스 내로 질소를 포함하는 기체를 흘려주는 단계;상기 티타늄 이산화물(TiO2)의 환원이 이루어짐에 따라, 티타늄이 결핍되면서 암염구조의 티타늄 자리에 공공(vacancy)이 형성되고, 산소를 치환하면서 암염구조의 산소 자리에 질소가 형성되어 티타늄과 결합을 이루는 단계; 및상기 퍼니스를 냉각하여 티타늄 산질화물을 수득하는 단계를 포함하며,수득된 티타늄 산질화물은 티타늄결핍형 암염구조 티타늄 산질화물(Ti1 - xO1 -yNy, x 및 y는 실수)로서,티타늄결핍 정도를 나타내는 x는 0보다 크고 1보다 작으며,질소의 도입 정도를 나타내는 y는 0보다 크고 1보다 작은 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물의 제조방법.
- 제7항에 있어서, 상기 가열에 의해 상기 퍼니스 내의 온도가 600∼1000℃로 유지되는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물의 제조방법.
- 제7항에 있어서, 질소를 포함하는 상기 기체는 NH3 또는 N2로 이루어지며,질소를 포함하는 상기 기체는 상기 퍼니스 내로 0.01∼10cc/min의 유량으로 공급되는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물의 제조방법.
- 제7항에 있어서, 질소를 포함하는 상기 기체는 NH3와 N2의 혼합기체로 이루어지며,상기 혼합기체는 NH3와 N2가 0.1∼50:50∼99.9의 부피비로 혼합된 기체이고,상기 혼합기체는 상기 퍼니스 내로 0.01∼10cc/min의 유량으로 공급되는 것을 특징으로 하는 티타늄결핍형 암염구조 티타늄 산질화물의 제조방법.
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CN201280076908.XA CN104884389B (zh) | 2012-11-06 | 2012-11-20 | 钛缺失型岩盐结构氧氮化钛 |
US14/441,014 US9487403B2 (en) | 2012-11-06 | 2012-11-20 | Titanium oxynitride having titanium deficiency-type halite structure |
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