JP2005296766A - Production method of photocatalytic functional material - Google Patents
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- JP2005296766A JP2005296766A JP2004115011A JP2004115011A JP2005296766A JP 2005296766 A JP2005296766 A JP 2005296766A JP 2004115011 A JP2004115011 A JP 2004115011A JP 2004115011 A JP2004115011 A JP 2004115011A JP 2005296766 A JP2005296766 A JP 2005296766A
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 62
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 229910000000 metal hydroxide Inorganic materials 0.000 claims abstract description 15
- 150000004692 metal hydroxides Chemical class 0.000 claims abstract description 15
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 15
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 14
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 7
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 claims abstract description 5
- 229910021511 zinc hydroxide Inorganic materials 0.000 claims abstract description 5
- 229940007718 zinc hydroxide Drugs 0.000 claims abstract description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 3
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- 239000011701 zinc Substances 0.000 claims abstract description 3
- 239000011941 photocatalyst Substances 0.000 claims description 18
- 239000010419 fine particle Substances 0.000 claims description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000010955 niobium Substances 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052762 osmium Inorganic materials 0.000 claims description 2
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- 239000010948 rhodium Substances 0.000 claims description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 33
- 239000011787 zinc oxide Substances 0.000 abstract description 16
- 239000002245 particle Substances 0.000 abstract description 8
- 238000000354 decomposition reaction Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 3
- 230000001877 deodorizing effect Effects 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 2
- 239000002923 metal particle Substances 0.000 abstract 2
- 239000002341 toxic gas Substances 0.000 abstract 1
- -1 zinc oxide Chemical class 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 description 25
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 231100000614 poison Toxicity 0.000 description 4
- 230000007096 poisonous effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000008204 material by function Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 2
- 238000004332 deodorization Methods 0.000 description 2
- 229920002620 polyvinyl fluoride Polymers 0.000 description 2
- 239000011163 secondary particle Substances 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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Abstract
Description
本発明は、活性炭に光触媒機能を有する金属酸化物が形成された光触媒機能材料の製造方法に関する。 The present invention relates to a method for producing a photocatalytic functional material in which a metal oxide having a photocatalytic function is formed on activated carbon.
特許文献１には、活性炭の表面に、蒸着手段により光触媒の薄膜を形成、担持させたことを特徴とする光触媒活性炭などについて開示されている。 Patent Document 1 discloses a photocatalytic activated carbon characterized in that a thin film of a photocatalyst is formed and supported on the surface of the activated carbon by vapor deposition means.
特許文献２には、主としてアセトアルデヒドの吸着能力が２０ｍｇ／ｇ（平衡濃度１０ｐｐｍでの平衡吸着量）以上である活性炭３０〜８０質量％と、アンモニアガスの平衡濃度１０ｐｐｍ時の平衡吸着量が５ｍｇ／ｇ以上の光反応性半導体１０〜４０質量％及び熱融着性バインダー繊維１〜３０質量％とを湿式抄紙法により混抄し、熱融着性バインダーを融着させて得られた密度が０．１０ｇ／ｃｍ3以上である有害物除去シ−トについて開示されている。 Patent Document 2 discloses that 30 to 80% by mass of activated carbon having an acetaldehyde adsorption capacity of 20 mg / g or more (equilibrium adsorption amount at an equilibrium concentration of 10 ppm) and an equilibrium adsorption amount of 5 mg / g at an ammonia gas equilibrium concentration of 10 ppm. 10 g or more of photoreactive semiconductor and 1-30 mass% of heat-fusible binder fibers are mixed by a wet papermaking method, and the density obtained by fusing the heat-fusible binder is 0.00. It discloses a harmful substance removal sheet that is 10 g / cm 3 or more.
いわゆる光触媒は、その材料が必要とする光が供給されれば、一定の光活性を示し、消臭、毒ガス成分の分解等の作用を発現することができる。しかし、その処理速度は一般的には遅く、光触媒単体でその処理能力を高めるのは限界があった。 A so-called photocatalyst exhibits a certain photoactivity when supplied with the light required by the material, and can exhibit actions such as deodorization and decomposition of poisonous gas components. However, the processing speed is generally slow, and there is a limit to increasing the processing capacity with a single photocatalyst.
一方、活性炭繊維やゼオライトなどの吸着剤は非常に吸着性能が高いため、臭い成分に相当するガスや、人体に悪影響を及ぼす毒ガス成分などは短時間で吸着できるが、自身がそのままの状態で（室温下で）分解することがないため、限界量を超えると吸着しなくなり、機能を失ってしまうことが知られている。 On the other hand, adsorbents such as activated carbon fiber and zeolite have very high adsorption performance, so gas equivalent to odor components and poisonous gas components that adversely affect the human body can be adsorbed in a short time. It does not decompose (at room temperature), and it is known that if it exceeds the limit amount, it will not adsorb and lose its function.
そして、この両者をうまく組み合わせることができれば、除去したいガスを早く吸着して、かつ、その吸着によって濃縮されたガスを光触媒によって効率良く分解していくことができるほか、吸着材料の吸着性能を光触媒によって再生することが可能であり、安定した機能を供給することができる。 If these two can be combined well, the gas to be removed can be adsorbed quickly, and the gas concentrated by the adsorption can be efficiently decomposed by the photocatalyst. Can be replayed and can provide a stable function.
吸着材料が吸着したガス分子は吸着材料の表面において拡散する性質があり、これらのガス分子を分解する光触媒は吸着サイトの極近くに配置することが必要である。ここで、吸着材料の表面にバインダーを介して光触媒を直接担持すると、吸着サイトはバインダー成分によって埋まり、十分な吸着性能を発揮することができない。また、特許文献１に開示のように、蒸着等の手段で光触媒を把持しても、緻密な膜として形成されるために、これもまた吸着性能の劣化に繋がる。 The gas molecules adsorbed by the adsorbing material have a property of diffusing on the surface of the adsorbing material, and the photocatalyst for decomposing these gas molecules needs to be arranged very close to the adsorption site. Here, when the photocatalyst is directly supported on the surface of the adsorbing material via the binder, the adsorption site is filled with the binder component, and sufficient adsorption performance cannot be exhibited. Further, as disclosed in Patent Document 1, even if the photocatalyst is gripped by means such as vapor deposition, it is formed as a dense film, which also leads to deterioration in adsorption performance.
特許文献２に開示の技術においては、活性炭繊維と光触媒を複合化するにあたり、活性炭繊維と光触媒ＴｉＯ２と熱融着性バインダー繊維とを湿式抄紙法より混抄し、熱融着性バインダーを融着させることにより活性炭繊維と光触媒を複合化しているが、光触媒材料は活性炭繊維上に担持させたものではなく、空間的に離れた場所に固定されているため、活性炭繊維に吸着したガス分子の表面拡散において光触媒にガス分子が接触する頻度は低いと考えられ、光照射による活性炭繊維の吸着能力再生効果は低いものと予想される。また、熱融着性繊維は有機バインダーと捉えることが出来るため、長期的な使用によっては有機バインダー成分が光触媒によって分解されて光触媒が脱落し、性能が低下する可能性がある。 In the technique disclosed in Patent Document 2, when the activated carbon fiber and the photocatalyst are combined, the activated carbon fiber, the photocatalyst TiO 2 and the heat-fusible binder fiber are mixed by a wet papermaking method, and the heat-fusible binder is fused. Activated carbon fiber and photocatalyst are combined, but the photocatalyst material is not supported on the activated carbon fiber, but is fixed in a spatially separated place, so the surface of gas molecules adsorbed on the activated carbon fiber It is considered that the frequency with which gas molecules come into contact with the photocatalyst during diffusion is low, and it is expected that the adsorption ability regeneration effect of activated carbon fiber by light irradiation is low. Further, since the heat-fusible fiber can be regarded as an organic binder, depending on long-term use, the organic binder component is decomposed by the photocatalyst, and the photocatalyst may fall off, thereby reducing the performance.
本発明の目的は、簡易な方法で吸着性能を有する活性炭の表面に光触媒活性を有する金属酸化物を担持することができ、基材表面との密着性に優れ、且つ長期間に渡って継続的に消臭、毒ガス成分の分解等の作用を発現することができる光触媒機能材料の製造方法を提供することである。 The object of the present invention is to support a metal oxide having photocatalytic activity on the surface of activated carbon having adsorption performance by a simple method, excellent in adhesion to the substrate surface, and continuous over a long period of time. It is another object of the present invention to provide a method for producing a photocatalytic functional material capable of exhibiting actions such as deodorization and decomposition of poisonous gas components.
本発明は、活性炭に光触媒機能を有する金属酸化物が形成された光触媒機能材料の製造方法において、少なくとも金属、金属イオン又は金属水酸化物を含む溶媒を前記活性炭に接触させて前記金属、金属イオン又は金属水酸化物を前記活性炭の表面に吸着させる工程と、この後、前記金属、金属イオン又は金属水酸化物を吸着した活性炭を加熱処理して前記金属酸化物が形成された光触媒機能材料とする工程と、を含んでなることを特徴とする光触媒機能材料の製造方法である。 The present invention provides a method for producing a photocatalytic functional material in which a metal oxide having a photocatalytic function is formed on activated carbon, wherein a solvent containing at least a metal, a metal ion, or a metal hydroxide is brought into contact with the activated carbon so that the metal, the metal ion Or a step of adsorbing a metal hydroxide on the surface of the activated carbon, and then a photocatalytic functional material in which the metal oxide is formed by heat-treating the activated carbon adsorbing the metal, metal ion or metal hydroxide. A process for producing a photocatalytic functional material.
本発明によれば、活性炭の吸着能力が吸着飽和によって劣化しても紫外光を照射することで光触媒機能により活性炭の吸着性能を再生させることができる光触媒機能材料を製造することができる。そして、簡易な方法で吸着性能を有する活性炭の表面に光触媒活性を有する金属酸化物を担持することができ、基材表面との密着性に優れ、且つ長期間に渡って継続的に消臭、毒ガス成分の分解等の作用を発現することができる光触媒機能材料の製造方法を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, even if the adsorption capability of activated carbon deteriorates by adsorption saturation, the photocatalyst functional material which can reproduce | regenerate the adsorption performance of activated carbon by a photocatalytic function by irradiating with ultraviolet light can be manufactured. And it is possible to carry a metal oxide having photocatalytic activity on the surface of activated carbon having adsorption performance by a simple method, excellent in adhesion with the substrate surface, and deodorizing continuously over a long period of time, It is possible to provide a method for producing a photocatalytic functional material capable of expressing an action such as decomposition of a poisonous gas component.
本発明を実施するための最良の一形態について説明する。 The best mode for carrying out the present invention will be described.
本実施の形態は、活性炭に光触媒機能を有する金属酸化物が形成された光触媒機能材料の製造方法である。本実施の形態では、このような光触媒を次の第１工程、第２工程を順に実施して製造する。 The present embodiment is a method for producing a photocatalytic functional material in which a metal oxide having a photocatalytic function is formed on activated carbon. In the present embodiment, such a photocatalyst is manufactured by sequentially performing the following first step and second step.
（１）第１工程
まず、少なくとも金属、金属イオン又は金属水酸化物の粒子を含む溶媒を活性炭、例えば、活性炭繊維に接触させる。これにより、金属、金属イオン又は金属水酸化物の粒子を活性炭繊維の表面に吸着させる。
(1) First Step First, a solvent containing at least metal, metal ion, or metal hydroxide particles is brought into contact with activated carbon, for example, activated carbon fiber. Thereby, the particle | grains of a metal, a metal ion, or a metal hydroxide are made to adsorb | suck to the surface of activated carbon fiber.
この金属、金属イオン、金属水酸化物としては、具体的には、亜鉛、亜鉛イオン、水酸化亜鉛などを用いることができる。 Specific examples of the metal, metal ion, and metal hydroxide that can be used include zinc, zinc ion, and zinc hydroxide.
（２）第２工程
その後、金属、金属イオン又は金属水酸化物の粒子を吸着した活性炭を加熱処理する。この加熱処理により、光触媒機能を有する金属酸化物、例えば、酸化亜鉛が活性炭に形成される。この加熱処理の温度は、４０℃〜４８０℃の範囲の温度とするのが望ましい。
(2) 2nd process Then, the activated carbon which adsorb | sucked the particle | grains of a metal, a metal ion, or a metal hydroxide is heat-processed. By this heat treatment, a metal oxide having a photocatalytic function, such as zinc oxide, is formed on the activated carbon. The temperature of the heat treatment is desirably a temperature in the range of 40 ° C to 480 ° C.
これにより、活性炭に光触媒機能を有する金属酸化物が形成された光触媒機能材料を製造することができる。以上の第１工程、第２工程の後に以下の第３工程を実行してもよい。 Thereby, the photocatalytic functional material in which the metal oxide which has a photocatalytic function was formed in activated carbon can be manufactured. You may perform the following 3rd processes after the above 1st process and 2nd process.
（３）第３工程
すなわち、第２工程の加熱処理後の光触媒機能材料に、少なくともニオブ、ルテニウム、ロジウム、パラジウム、銀、スズ、オスミウム、白金、及び金の９種類の材料のイオン又は微粒子からなる群のうち少なくとも１種類以上を含有する溶媒に接触することにより、光触媒機能材料の表面に同金属を析出又は付着させ、活性炭に付着した酸化亜鉛の表面に担持させる。
(3) Third step That is, from the ions or fine particles of at least nine kinds of materials of niobium, ruthenium, rhodium, palladium, silver, tin, osmium, platinum, and gold to the photocatalytic functional material after the heat treatment in the second step. By contacting with a solvent containing at least one or more of the group, the metal is deposited on or attached to the surface of the photocatalytic functional material, and is supported on the surface of zinc oxide attached to the activated carbon.
本発明の一実施について説明する。 One embodiment of the present invention will be described.
以下の例は、光触媒機能を有する金属酸化物が酸化亜鉛（ＺｎＯ）の場合である。 In the following example, the metal oxide having a photocatalytic function is zinc oxide (ZnO).
（実施例１）
水酸化亜鉛微粒子を投入した分散水を撹拝しながら活性炭繊維を約１０秒浸漬した後、遠心脱水機で脱水し、水酸化亜鉛粒子が吸着した活性炭繊維を３００℃で加熱処理し、ＺｎＯを担持した活性炭繊維を得た。
(Example 1)
After the activated carbon fibers are immersed for about 10 seconds while stirring the dispersed water containing the zinc hydroxide fine particles, the activated carbon fibers adsorbed with the zinc hydroxide particles are heated at 300 ° C. by dehydration with a centrifugal dehydrator. A supported activated carbon fiber was obtained.
（実施例２）
実施例１の処理によって得られたＺｎＯを担持した活性炭繊維をＡｇの微粒子を含有した分散水に浸漬し、乾燥させてＡｇの微粒子を表面に付着させたＺｎＯを担持した活性炭繊維を得た。
(Example 2)
The activated carbon fiber carrying ZnO obtained by the treatment of Example 1 was immersed in a dispersion water containing Ag fine particles and dried to obtain activated carbon fiber carrying ZnO having Ag fine particles attached to the surface.
（比較例１）
比較例として実施例１，２のような処理を行なっていない活性炭繊維を用いた。
(Comparative Example 1)
As a comparative example, activated carbon fibers not subjected to the treatment as in Examples 1 and 2 were used.
（作製物の評価）
上記の実施例１，２において形成した光触媒機能材料と比較例１の活性炭繊維において、下記の要領で比較試験を行った。
(Evaluation of the product)
For the photocatalytic functional material formed in Examples 1 and 2 above and the activated carbon fiber of Comparative Example 1, a comparative test was performed in the following manner.
（１）実施例１，２において形成した光触媒機能材料と比較例１の活性炭繊維０．５ｇを５ｃｍ×５ｃｍの浅いケースに均一に敷き詰め、容量３リットルのテドラーバッグに挿入し、濃度３０ｐｐｍのアセトアルデヒトガスを含有した空気を、このテドラーバッグ内に充填する。次に、暗所において１時間放置後、テドラーバッグ内のアセトアルデヒトガス濃度をガス検知管により確認する。この作業を２度行い、吸着性能の劣化を確認した。 (1) The photocatalytic functional material formed in Examples 1 and 2 and 0.5 g of the activated carbon fiber of Comparative Example 1 were evenly spread in a shallow case of 5 cm × 5 cm, inserted into a 3 liter Tedlar bag, and an acetaldehyde having a concentration of 30 ppm The Tedler bag is filled with air containing gas. Next, after standing for 1 hour in a dark place, the acetaldehyde gas concentration in the Tedlar bag is checked with a gas detector tube. This operation was performed twice to confirm the deterioration of the adsorption performance.
（２）上記の試験を行った実施例１，２の光触媒機能材料と比較例１の活性炭繊維にＵＶ−Ａ照射強度２ｍＷ／ｃｍ２のブラックライトを３時間照射し、再度、（１）の試験を１回行い、光再生効果を確認した。 (2) The photocatalytic functional materials of Examples 1 and 2 and the activated carbon fiber of Comparative Example 1 subjected to the above test were irradiated with black light having a UV-A irradiation intensity of 2 mW / cm 2 for 3 hours, and again according to (1) The test was performed once and the light reproduction effect was confirmed.
その結果を図１に示す。図１において、上記（１）の２度の吸着性能の劣化の確認が「吸着試験１回目」と「吸着試験２回目」であり、（２）の光再生効果の確認が「光再生後吸着試験」である。 The result is shown in FIG. In FIG. 1, the confirmation of the deterioration of the adsorption performance twice in (1) is the “first adsorption test” and the “second adsorption test”, and the confirmation of the light regeneration effect in (2) is “adsorption after light regeneration”. "Test".
図１から明らかなように、実施例１，２の光触媒機能材料は、吸着試験２回目には活性炭繊維の吸着能力が吸着飽和によって劣化していることがわかる。また、この劣化は比較例１の活性炭繊維とほぼ同等のレベルである。つまり、光触媒の担持処理を行っても活性炭繊維の吸着能力はほとんど損なわれないということがわかる。次に、光再生後吸着試験によっては、比較例１ではガス残存率１８％であるのに対し、実施例１では５％に低減することができた。実施例２によってはガス残存率が１％未満（検出限界）であることから、Ａｇの微粒子を付与したＺｎＯが活性炭繊維に吸着したアセトアルデヒトガスを分解し、完全に再生処理させていることがわかる。 As is clear from FIG. 1, it can be seen that the photocatalytic functional materials of Examples 1 and 2 have deteriorated the adsorption ability of the activated carbon fiber due to adsorption saturation in the second adsorption test. Moreover, this deterioration is a level substantially equivalent to the activated carbon fiber of the comparative example 1. That is, it is understood that the adsorption ability of the activated carbon fiber is hardly impaired even when the photocatalyst is supported. Next, according to the adsorption test after light regeneration, the gas remaining rate in Comparative Example 1 was 18%, whereas in Example 1, it could be reduced to 5%. Depending on Example 2, since the residual gas rate is less than 1% (detection limit), ZnO provided with Ag fine particles decomposes the acetaldehyde gas adsorbed on the activated carbon fiber and completely regenerates it. Understand.
さらに、実施例１，２の光触媒機能材料を流水洗浄してみたが、ＺｎＯの離脱等が見られず、乾式はもちろんのこと、湿式のシート加工にも耐えうる強度を持っていることがわかった。 Furthermore, when the photocatalytic functional materials of Examples 1 and 2 were washed with running water, no separation of ZnO was observed, and it was found that the material had strength enough to withstand wet sheet processing as well as dry processing. It was.
図２は、ＺｎＯを担持していない活性炭繊維の拡大写真であり、図３は、前述のようにＺｎＯを担持した活性炭繊維の拡大写真である。ＺｎＯを担持していない活性炭繊維は表面が平坦で何も担持されていないが、ＺｎＯを担持した活性炭繊維においては、写真中の白く見える粒子が酸化亜鉛である。この倍率（×１０００）では酸化亜鉛の二次粒子しか観察できないが、実際には粒子径１００ｎｍ未満の酸化亜鉛粒子が疎に凝集して二次粒子を形成している。 FIG. 2 is an enlarged photograph of activated carbon fibers not supporting ZnO, and FIG. 3 is an enlarged photograph of activated carbon fibers supporting ZnO as described above. The activated carbon fiber not supporting ZnO has a flat surface and nothing is supported, but in the activated carbon fiber supporting ZnO, the white particles in the photograph are zinc oxide. At this magnification (× 1000), only zinc oxide secondary particles can be observed, but in practice, zinc oxide particles having a particle diameter of less than 100 nm are loosely aggregated to form secondary particles.
Claims (5)
少なくとも金属、金属イオン又は金属水酸化物を含む溶媒を前記活性炭に接触させて前記金属、金属イオン又は金属水酸化物を前記活性炭の表面に吸着させる工程と、
この後、前記金属、金属イオン又は金属水酸化物を吸着した活性炭を加熱処理して前記金属酸化物が形成された光触媒機能材料とする工程と、
を含んでなることを特徴とする光触媒機能材料の製造方法。 In the method for producing a photocatalytic functional material in which a metal oxide having a photocatalytic function is formed on activated carbon,
Contacting the activated carbon with a solvent containing at least metal, metal ion or metal hydroxide to adsorb the metal, metal ion or metal hydroxide on the surface of the activated carbon;
Thereafter, a process of heat-treating the activated carbon adsorbing the metal, metal ion or metal hydroxide to form a photocatalytic functional material in which the metal oxide is formed,
A method for producing a photocatalytic functional material comprising:
The photocatalytic functional material after the heat treatment is at least one metal selected from the group consisting of ions or fine particles of at least nine kinds of materials of niobium, ruthenium, rhodium, palladium, silver, tin, osmium, platinum, and gold. The photocatalytic function according to any one of claims 1 to 4, further comprising a step of supporting the metal of the solvent on the surface of the metal oxide attached to the activated carbon by contacting with a solvent containing Material manufacturing method.
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