JPH11244706A - Photocatalyst comprising anatase-type titanium oxide and its manufacture - Google Patents
Photocatalyst comprising anatase-type titanium oxide and its manufactureInfo
- Publication number
- JPH11244706A JPH11244706A JP10004335A JP433598A JPH11244706A JP H11244706 A JPH11244706 A JP H11244706A JP 10004335 A JP10004335 A JP 10004335A JP 433598 A JP433598 A JP 433598A JP H11244706 A JPH11244706 A JP H11244706A
- Authority
- JP
- Japan
- Prior art keywords
- titanium oxide
- photocatalyst
- yttrium
- anatase
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 43
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 10
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 9
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002781 deodorant agent Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 150000003746 yttrium Chemical class 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 3
- 150000003608 titanium Chemical class 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims 1
- 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 abstract description 10
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 8
- 230000001699 photocatalysis Effects 0.000 abstract description 6
- 239000011521 glass Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 241000233866 Fungi Species 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000006864 oxidative decomposition reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- 229910000484 niobium oxide Inorganic materials 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical class O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- DEXZEPDUSNRVTN-UHFFFAOYSA-K yttrium(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[Y+3] DEXZEPDUSNRVTN-UHFFFAOYSA-K 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アナタース型酸化
チタンからなる光触媒とその製造方法に関し、詳しく
は、種々の有機、無機物質の分解除去や殺菌のほか、ガ
ラスを超親水性にして防汚機能をもたせる等のために好
適に用いることができるアナタース型酸化チタンからな
る光触媒とその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocatalyst comprising anatase-type titanium oxide and a method for producing the same. The present invention relates to a photocatalyst comprising an anatase-type titanium oxide which can be suitably used for giving a function and the like, and a method for producing the same.
【０００２】[0002]
【従来の技術】酸化チタンは、これにそのバンドギャッ
プエネルギーを越える３８０ｎｍ以下の波長の光を照射
すると、価電子帯の電子が伝導帯に励起されると共に、
価電子帯に正孔が形成される。この正孔は強い酸化力を
有し、一方、伝導帯の電子は強い還元力を有している。
そこで、このように酸化チタンに光照射することによっ
て強い酸化還元力を有する光特性を利用して、種々の有
機、無機物質の分解除去、殺菌等を行なうことができ、
例えば、アセトアルデヒドやメルカプタン類等の悪臭成
分の分解除去、菌類や藻類の殺菌除去、窒素酸化物の酸
化分解除去等に、一部、実用化されている。また、最近
では、ガラスに光触媒機能を有する酸化チタンを塗布
し、ガラスを超親水性として、防汚機能をもたせること
も行なわれている。2. Description of the Related Art When a titanium oxide is irradiated with light having a wavelength of 380 nm or less exceeding its band gap energy, electrons in a valence band are excited to a conduction band, and
Holes are formed in the valence band. These holes have strong oxidizing power, while electrons in the conduction band have strong reducing power.
Thus, by irradiating the titanium oxide with light in this manner, it is possible to perform decomposition and removal of various organic and inorganic substances, sterilization, and the like by utilizing optical characteristics having a strong redox power.
For example, it has been partially put to practical use for decomposing and removing malodorous components such as acetaldehyde and mercaptans, sterilizing and removing fungi and algae, and oxidative decomposition of nitrogen oxides. Recently, it has also been practiced to apply a titanium oxide having a photocatalytic function to glass to make the glass super-hydrophilic and have an antifouling function.
【０００３】従来、このような酸化チタンの光触媒機能
を高めるために、白金、ルテニウム、銀のような貴金属
成分や、酸化タングステン、酸化モリブデン、酸化バナ
ジウム、酸化ニオブ等の金属酸化物成分を酸化チタンに
担持させることが提案されている。このような貴金属成
分や酸化物成分を担持させることによって、酸化チタン
は、光触媒機能において、若干の向上がみられるもの
の、未だ十分とはいえない。Conventionally, in order to enhance the photocatalytic function of titanium oxide, noble metal components such as platinum, ruthenium and silver, and metal oxide components such as tungsten oxide, molybdenum oxide, vanadium oxide and niobium oxide have been used. It has been proposed to be carried on a substrate. By supporting such a noble metal component or oxide component, titanium oxide has a slight improvement in the photocatalytic function, but is not yet sufficient.
【０００４】[0004]
【発明が解決しようとする課題】本発明者らは、酸化チ
タンからなる光触媒における上述したような問題を解決
するために、酸化チタンへの種々の金属元素のドーピン
グによって、酸化チタンに不純物準位を形成し、酸化チ
タンの光触媒機能を向上させるドーピング金属元素を広
範囲にわたって検討した結果、Ｙ（イットリウム）がそ
のような目的に適うことを見出して、本発明に至ったも
のである。即ち、本発明は、従来より知られている光触
媒よりも非常に高活性のアナタース型酸化チタンからな
る光触媒とそ製造方法を提供することを目的とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the photocatalyst made of titanium oxide, the inventors of the present invention have proposed that titanium oxide is doped with various metal elements so that the titanium oxide has an impurity level. After extensively studying a doping metal element for improving the photocatalytic function of titanium oxide, it has been found that Y (yttrium) is suitable for such purpose, and the present invention has been accomplished. That is, an object of the present invention is to provide a photocatalyst comprising an anatase-type titanium oxide, which has a much higher activity than conventionally known photocatalysts, and a method for producing the same.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、酸化チ
タンに対してＹを0.０１〜５モル％の範囲にて含有する
ことを特徴とするアナタース型酸化チタンからなる光触
媒が提供される。According to the present invention, there is provided a photocatalyst comprising an anatase-type titanium oxide, wherein Y is contained in a range of 0.01 to 5 mol% based on titanium oxide. You.
【０００６】また、本発明によれば、酸化チタンに対し
てＹを0.０１〜５モル％の範囲にて含有する、チタンの
水酸化物又は酸化物とイットリウムの水酸化物又は酸化
物との混合物を調製し、この混合物を酸化性雰囲気中、
２００〜７００℃の範囲の温度で焼成することを特徴と
するアナタース型酸化チタンからなる光触媒の製造方法
が提供される。Further, according to the present invention, a titanium hydroxide or oxide and a yttrium hydroxide or oxide containing Y in the range of 0.01 to 5 mol% with respect to titanium oxide. Is prepared, and this mixture is placed in an oxidizing atmosphere.
A method for producing a photocatalyst comprising anatase-type titanium oxide, characterized in that the method is calcined at a temperature in the range of 200 to 700 ° C.
【０００７】[0007]
【発明の実施の形態】本発明において、光触媒とは、紫
外線等の光を照射することによって、触媒活性を示す物
質をいい、具体的には、光を照射することによって、種
々の有機、無機物質の分解除去、殺菌等を行なうことが
でき、例えば、アセトアルデヒドやメルカプタン類等の
悪臭成分の分解除去、菌類や藻類の殺菌除去、窒素酸化
物の酸化分解除去、ガラスの超親水性化による防汚機能
の付与等に好適に用いることができる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a photocatalyst refers to a substance exhibiting catalytic activity by irradiating light such as ultraviolet rays, and more specifically, various organic and inorganic substances by irradiating light. Decomposition and removal of substances, sterilization, etc. can be performed, for example, decomposition and removal of malodorous components such as acetaldehyde and mercaptans, sterilization and removal of fungi and algae, oxidative decomposition and removal of nitrogen oxides, prevention by superhydrophilicity of glass It can be suitably used for imparting a soiling function.
【０００８】本発明による光触媒は、酸化チタンに対し
てＹを0.０１〜５モル％の範囲、好ましくは、0.０５〜
2.５モル％の範囲にて含有する。Ｙの含有量が0.１モル
％よりも少ないときは、光触媒としての活性の向上が乏
しく、他方、５モル％を越えても、活性の向上が飽和す
るので、触媒の製造費用の点から不利である。The photocatalyst according to the present invention has a Y content in the range of 0.01 to 5 mol%, preferably 0.05 to 5 mol%, based on titanium oxide.
It is contained in the range of 2.5 mol%. When the content of Y is less than 0.1 mol%, the activity as a photocatalyst is poorly improved. On the other hand, when the content exceeds 5 mol%, the activity is saturated. Disadvantageous.
【０００９】このような本発明による光触媒は、通常、
比表面積が５０〜３５０ｍ2 ／ｇの範囲にある。The photocatalyst according to the present invention is usually
The specific surface area is in the range of 50~350m 2 / g.
【００１０】本発明による光触媒は、種々の方法によっ
て調製することができるが、好ましくは、酸化チタンに
対してＹを0.０１〜５モル％の範囲にて含有する、チタ
ンの水酸化物又は酸化物とイットリウムの水酸化物又は
酸化物との混合物を調製し、この混合物を例えば空気の
ような酸化性雰囲気中、２００〜７００℃の範囲の温度
で焼成することによって得ることができる。The photocatalyst according to the present invention can be prepared by various methods. Preferably, the photocatalyst is a hydroxide or titanium hydroxide containing Y in the range of 0.01 to 5 mol% based on titanium oxide. It can be obtained by preparing a mixture of an oxide and a hydroxide or oxide of yttrium and calcining the mixture in an oxidizing atmosphere such as air at a temperature in the range of 200 to 700 ° C.
【００１１】チタンの水酸化物又は酸化物とイットリウ
ムの水酸化物又は酸化物との混合物を調製する方法は、
特に、限定されるものではないが、好ましくは、チタン
塩とイットリウム塩とを含む溶液に水を加え、これらの
塩を加水分解すればよい。この際、目的とする組成を有
する光触媒を得ることができるように、上記混合物は、
酸化チタンに対してＹを0.０１〜５モル％の範囲にて含
有することが必要である。かくして、得られた反応生成
物を乾燥させた後、酸化性雰囲気中、２００〜７００℃
の範囲の温度で焼成すれば、本発明によるアナタース型
酸化チタンからなる光触媒を得ることができる。A method for preparing a mixture of a hydroxide or oxide of titanium and a hydroxide or oxide of yttrium comprises:
Although not particularly limited, preferably, water may be added to a solution containing a titanium salt and a yttrium salt to hydrolyze these salts. At this time, the mixture is so prepared that a photocatalyst having a desired composition can be obtained.
It is necessary that Y is contained in the range of 0.01 to 5 mol% with respect to titanium oxide. Thus, after drying the obtained reaction product, in an oxidizing atmosphere, 200 to 700 ° C.
When calcined at a temperature in the range, a photocatalyst comprising the anatase-type titanium oxide according to the present invention can be obtained.
【００１２】特に、限定されるものではないが、本発明
においては、チタン塩としては、例えば、チタニル硫
酸、チタンテトライソプロボキシドのようなチタンテト
ラアルコキシド、四塩化チタン等が用いられ、また、イ
ットリウム塩としては、好ましくは、硝酸イットリウム
が用いられる。Although not particularly limited, in the present invention, as the titanium salt, for example, titanyl sulfate, titanium tetraalkoxide such as titanium tetraisopropoxide, titanium tetrachloride and the like are used. As the yttrium salt, yttrium nitrate is preferably used.
【００１３】より具体的には、チタンテトライソプロポ
キシドのようなチタンテトラアルコキシドをアルコール
で希釈して溶液とし、これに硝酸イットリウムのような
アルコールに溶解するイットリウム塩を所定量加え、水
中に投入し、加水分解させ、重縮合させた後、得られた
反応生成物を濾過し、乾燥した後、空気中、２００〜７
００℃、好ましくは、３００〜６００℃で焼成すること
によって、本発明によるアナタース型酸化チタンを主成
分とする光触媒を得ることができる。More specifically, a titanium tetraalkoxide such as titanium tetraisopropoxide is diluted with an alcohol to form a solution, and a predetermined amount of an yttrium salt dissolved in an alcohol such as yttrium nitrate is added to the solution, which is then added to water. After hydrolysis and polycondensation, the resulting reaction product is filtered, dried and then dried in air at 200 to 7
By calcining at 00 ° C., preferably 300 to 600 ° C., the photocatalyst containing anatase-type titanium oxide as a main component according to the present invention can be obtained.
【００１４】また、別の方法として、チタニル硫酸の水
溶液に硝酸イットリウムのような水溶性塩を所定量加え
た後、アンモニア水や水酸化アルカリ金属（例えば、水
酸化ナトリウムや水酸化カリウム等）水溶液のようなア
ルカリにて加水分解し、得られた反応生成物を濾過し、
乾燥した後、空気中、２００〜７００℃、好ましくは、
３００〜６００℃で焼成してもよい。As another method, a predetermined amount of a water-soluble salt such as yttrium nitrate is added to an aqueous solution of titanyl sulfate, and then an aqueous solution of ammonia water or an alkali metal hydroxide (eg, sodium hydroxide or potassium hydroxide) is added. Hydrolysis with an alkali such as, the resulting reaction product is filtered,
After drying, 200-700 ° C. in air, preferably
You may bake at 300-600 degreeC.
【００１５】本発明によれば、このように、チタンの水
酸化物又は酸化物とイットリウムの水酸化物又は酸化物
との混合物を２００〜７００℃、好ましくは、３００〜
６００℃で焼成することによって、イットリウムを酸化
チタン中に効果的にドーピングすることができ、かくし
て、高い活性を有する光触媒を得ることができる。According to the present invention, the mixture of the hydroxide or oxide of titanium and the hydroxide or oxide of yttrium is prepared at 200 to 700 ° C., preferably at 300 to 700 ° C.
By baking at 600 ° C., yttrium can be effectively doped into titanium oxide, and thus a photocatalyst having high activity can be obtained.
【００１６】以下に実施例を挙げて本発明を説明する
が、本発明はこれら実施例により何ら限定されるもので
はない。Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples.
【００１７】実施例１ チタンテトライソプロポキシドをエタノールで希釈した
溶液に硝酸イットリウム（Ｙ（（ＮＯ3 ）3 ・６Ｈ
2 Ｏ）を酸化チタン（ＴｉＯ2 ）に対してＹ換算にて0.
５モル％となるように加え、水中に投入し、加水分解さ
せ、重縮合させた。この後、得られた反応生成物を濾過
し、乾燥した後、空気中、４００℃で焼成して、本発明
によるアナタース型酸化チタンからなる光触媒を得た。EXAMPLE 1 Yttrium nitrate (Y ((NO 3 ) 3 .6H) was added to a solution of titanium tetraisopropoxide diluted with ethanol.
2 O) to titanium oxide (TiO 2 ) in terms of Y,
The solution was added so as to have a concentration of 5 mol%, poured into water, hydrolyzed, and polycondensed. Thereafter, the obtained reaction product was filtered, dried, and calcined at 400 ° C. in air to obtain a photocatalyst comprising an anatase-type titanium oxide according to the present invention.
【００１８】実施例２〜５ 実施例１において、硝酸イットリウムを酸化チタンに対
してＹ換算にて0.０１モル％、0.１モル％、1.０モル％
又は5.０モル％加えた以外は、実施例１と同様にして、
それぞれ本発明による光触媒を得た。Examples 2 to 5 In Example 1, the amount of yttrium nitrate was 0.01 mol%, 0.1 mol%, 1.0 mol% in terms of Y with respect to titanium oxide.
Or, in the same manner as in Example 1 except that 5.0 mol% was added,
A photocatalyst according to the invention was obtained in each case.
【００１９】実施例６〜８ 実施例１において、反応生成物を２００℃、３００℃又
は５００℃で焼成した以外は、実施例１と同様にして、
それぞれ本発明による光触媒を得た。Examples 6 to 8 In the same manner as in Example 1, except that the reaction product was calcined at 200 ° C., 300 ° C. or 500 ° C.
A photocatalyst according to the invention was obtained in each case.
【００２０】実施例９ チタニル硫酸の水溶液に硝酸イットリウムを酸化チタン
に対してＹ換算にて0.５モル％となるように加えた後、
水溶液のｐＨが８になるまでアンモニア水を加えた。得
られた反応生成物を濾過し、乾燥した後、空気中、４０
０℃で焼成して、本発明による光触媒を得た。Example 9 Yttrium nitrate was added to an aqueous solution of titanyl sulfate so as to be 0.5 mol% in terms of Y with respect to titanium oxide.
Aqueous ammonia was added until the pH of the aqueous solution reached 8. The obtained reaction product was filtered, dried, and then dried in air at 40 ° C.
Calcination at 0 ° C. gave a photocatalyst according to the invention.
【００２１】比較例１ 実施例１において、チタンテトライソプロポキシドをエ
タノールで希釈した溶液に硝酸イットリウムを加えなか
った以外は、実施例１と同様にして、光触媒を得た。Comparative Example 1 A photocatalyst was obtained in the same manner as in Example 1, except that yttrium nitrate was not added to a solution of titanium tetraisopropoxide diluted with ethanol.
【００２２】比較例２ 実施例１において、反応生成物を１１０℃で焼成した以
外は、実施例１と同様にして、光触媒を得た。Comparative Example 2 A photocatalyst was obtained in the same manner as in Example 1, except that the reaction product was calcined at 110 ° C.
【００２３】実施例１０ 上記実施例１〜９、比較例１及び２にて得た粉末状の酸
化チタン（光触媒）を水及びコロイダルシリカと混合、
攪拌し、スラリーとした後、これを２０ｃｍ×１０ｃｍ
の紙の上に塗布し、酸化チタンコート紙を作製した。こ
れを５Ｌ容量のフラスコ内に静置し、フラスコ内のアセ
トアルデヒドガス濃度が１００ｐｐｍとなるようにアセ
トアルデヒドを充填した。次いで、このフラスコに５０
０Ｗ／ｃｍ2 の紫外強度を有するブラックライトを照射
しながら、フラスコ内のアセトアルデヒド濃度の変化を
ガスクロマトグラフで分析した。このアセトアルデヒド
の分解速度を光触媒の活性として表１に示す。Example 10 The powdery titanium oxide (photocatalyst) obtained in Examples 1 to 9 and Comparative Examples 1 and 2 was mixed with water and colloidal silica.
After stirring to make a slurry, this is 20 cm × 10 cm
Was coated on the paper to prepare titanium oxide coated paper. This was allowed to stand still in a 5 L capacity flask, and acetaldehyde was charged so that the acetaldehyde gas concentration in the flask became 100 ppm. Then, 50
The change in acetaldehyde concentration in the flask was analyzed by gas chromatography while irradiating black light having an ultraviolet intensity of 0 W / cm 2 . The decomposition rate of this acetaldehyde is shown in Table 1 as the activity of the photocatalyst.
【００２４】別に、上記酸化チタンスラリーをビーカー
の内面壁に塗布し、２００℃で焼成した後、0.１％濃度
の赤インキ水をビーカーに入れ、これに１２００Ｗ／ｃ
ｍ2の紫外強度を有するブラックライトを照射し、赤イ
ンキの色が消えるまでの時間を求めた。結果を表１に示
す。Separately, the above-mentioned titanium oxide slurry was applied to the inner wall of a beaker, baked at 200 ° C., and then 0.1% red ink water was put into the beaker, and 1200 W / c was added thereto.
Irradiation with black light having an ultraviolet intensity of m 2 was performed, and the time until the color of the red ink disappeared was determined. Table 1 shows the results.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【発明の効果】以上のように、本発明のアナタース型酸
化チタンからなる光触媒によれば、酸化チタンに対して
所定の割合でＹを含み、従来より知られている酸化チタ
ンからなる光触媒よりも、非常に高い光触媒活性を有
し、例えば、脱臭剤、脱色剤や、また、ガラスを超親水
性とする防汚機能付与剤として好適に用いることができ
る。As described above, according to the photocatalyst comprising anatase-type titanium oxide of the present invention, the photocatalyst comprising Y at a predetermined ratio with respect to titanium oxide is more effective than the conventionally known photocatalyst comprising titanium oxide. It has a very high photocatalytic activity and can be suitably used as, for example, a deodorant, a decolorizing agent, or an antifouling function-imparting agent for making glass superhydrophilic.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 仲辻 忠夫 大阪府堺市戎島町５丁１番地 堺化学工業 株式会社中央研究所内 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadao Nakatsuji 5-1-1 Ebisshima-cho, Sakai-shi, Osaka Sakai Chemical Industry Co., Ltd.
Claims (4)
の範囲にて含有することを特徴とするアナタース型酸化
チタンからなる光触媒。1. Y is 0.01 to 5 mol% based on titanium oxide.
A photocatalyst comprising an anatase-type titanium oxide, which is contained in the range of
の範囲にて含有する、チタンの水酸化物又は酸化物とイ
ットリウムの水酸化物又は酸化物との混合物を調製し、
この混合物を酸化性雰囲気中、２００〜７００℃の範囲
の温度で焼成することを特徴とするアナタース型酸化チ
タンからなる光触媒の製造方法。3. Y is 0.01 to 5 mol% based on titanium oxide.
A mixture of a hydroxide or oxide of titanium and a hydroxide or oxide of yttrium,
A method for producing a photocatalyst comprising anatase-type titanium oxide, wherein the mixture is calcined in an oxidizing atmosphere at a temperature in the range of 200 to 700 ° C.
水を加え、これらの塩を加水分解し、得られた反応生成
物を乾燥させた後、酸化性雰囲気中、２００〜７００℃
の範囲の温度で焼成することを特徴とするアナタース型
酸化チタンからなる光触媒の製造方法。4. Water is added to a solution containing a titanium salt and a yttrium salt to hydrolyze these salts, and the resulting reaction product is dried, and then dried at 200 to 700 ° C. in an oxidizing atmosphere.
A method for producing a photocatalyst comprising anatase-type titanium oxide, characterized by firing at a temperature in the range of:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10004335A JPH11244706A (en) | 1997-12-30 | 1998-01-12 | Photocatalyst comprising anatase-type titanium oxide and its manufacture |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9-370438 | 1997-12-30 | ||
| JP37043897 | 1997-12-30 | ||
| JP10004335A JPH11244706A (en) | 1997-12-30 | 1998-01-12 | Photocatalyst comprising anatase-type titanium oxide and its manufacture |
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| Publication Number | Publication Date |
|---|---|
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Family
ID=26338085
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| Country | Link |
|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043282A (en) * | 2002-05-20 | 2004-02-12 | Sumitomo Chem Co Ltd | Method of manufacturing titanium oxide |
| JP2004105958A (en) * | 2002-08-30 | 2004-04-08 | Sk Kaken Co Ltd | Method for manufacturing porous photocatalyst composite powder |
| JP2005199241A (en) * | 2004-01-19 | 2005-07-28 | National Institute Of Advanced Industrial & Technology | Photocatalyst body and its production method |
| CN113463374A (en) * | 2021-07-02 | 2021-10-01 | 南通大学 | Polyester fabric with photocatalytic self-cleaning performance and preparation method thereof |
-
1998
- 1998-01-12 JP JP10004335A patent/JPH11244706A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043282A (en) * | 2002-05-20 | 2004-02-12 | Sumitomo Chem Co Ltd | Method of manufacturing titanium oxide |
| JP2004105958A (en) * | 2002-08-30 | 2004-04-08 | Sk Kaken Co Ltd | Method for manufacturing porous photocatalyst composite powder |
| JP2005199241A (en) * | 2004-01-19 | 2005-07-28 | National Institute Of Advanced Industrial & Technology | Photocatalyst body and its production method |
| JP4563689B2 (en) * | 2004-01-19 | 2010-10-13 | 独立行政法人産業技術総合研究所 | Photocatalyst and method for producing the same |
| CN113463374A (en) * | 2021-07-02 | 2021-10-01 | 南通大学 | Polyester fabric with photocatalytic self-cleaning performance and preparation method thereof |
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