JP2006181514A

JP2006181514A - Photocatalyst carrier

Info

Publication number: JP2006181514A
Application number: JP2004379358A
Authority: JP
Inventors: Akihiro Kato; 陽弘加藤; Akio Mukai; 昭雄向井
Original assignee: Okaya Electric Industry Co Ltd
Current assignee: Okaya Electric Industry Co Ltd
Priority date: 2004-12-28
Filing date: 2004-12-28
Publication date: 2006-07-13

Abstract

<P>PROBLEM TO BE SOLVED: To realize a photocatalyst carrier capable of securing a large surface area of a photocatalyst carried. <P>SOLUTION: In the photocatalyst carrier 10 including a first translucent sheet member 16 on which many protruded parts 14 are formed through a joint part 12 and a second plane sheet member 18 having translucent property, and blocking the opening of the protruded parts 14 with the second sheet member 18 by joining the second sheet member 18 to the joint part 12 of the first sheet member 16 to form a space 20 between the protruded parts 14 of the first sheet member 16 and the second sheet member 18, the first sheet member 16 and the second sheet member 18 are made of a nonwoven fabric 22 carrying the photocatalyst 28, also a large number of translucent porous adsorbing materials 30 are arranged in the space 20, and the photocatalyst is carried on the surface and in the pore of the porous adsorbing materials 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、光触媒を担持して成る光触媒担持体に係り、特に、担持する光触媒の表面積を大きく確保することのできる光触媒担持体に関する。 The present invention relates to a photocatalyst carrier that carries a photocatalyst, and more particularly, to a photocatalyst carrier that can secure a large surface area of the photocatalyst to be carried.

酸化チタン（ＴｉＯ_２）等の光触媒は、紫外線等の光の照射を受けると活性化して強力な酸化還元作用を生じ、窒素酸化物（ＮＯ_Ｘ）、硫黄酸化物（ＳＯ_Ｘ）等の有害化合物や汚濁物等を効果的に分解する作用を発揮するものであることから、基体に光触媒を担持させて成る光触媒担持体を用いて空気や水の浄化を行う試みが成されている。
ところで、上記光触媒による有害化合物や汚濁物等の分解は、これら有害化合物や汚濁物等が光触媒に接触することによって生じる作用である。従って、光触媒による空気や水の浄化能力を向上させるためには、光触媒の表面積をできるだけ拡大することが望ましい。 Photocatalysts such as titanium oxide (TiO ₂ ) are activated when irradiated with light such as ultraviolet rays to produce a strong redox effect, and harmful compounds such as nitrogen oxides (NO _X ) and sulfur oxides (SO _X ) Attempts have been made to purify air and water using a photocatalyst carrying member in which a photocatalyst is carried on a substrate.
By the way, decomposition of harmful compounds, pollutants and the like by the photocatalyst is an effect caused by contact of these harmful compounds and pollutants with the photocatalyst. Therefore, in order to improve the ability of the photocatalyst to purify air and water, it is desirable to increase the surface area of the photocatalyst as much as possible.

そこで、本出願人は、先に、基体の表面に、表面を光触媒で被覆された多数の繊維状体を、上記基体表面に対して立設状態で被着して成る光触媒担持体を提案した（特開２００３−２０５２４４号）。
図１０に示すように、この光触媒担持体60は、ガラス、樹脂、金属等の適宜な材料より成る平板状の基体62の表面に、アナターゼ型の酸化チタン（ＴｉＯ_２）より成る光触媒64で被覆された多数の細長い繊維状体66が、接着剤68を介して、上記基体62表面に対して略垂直に立設状態で被着されている。この繊維状体66は、図１１及び図１２に示すように、ガラス繊維や樹脂繊維等の繊維70の表面に光触媒64をコーティングして構成されているものである。 Therefore, the present applicant has previously proposed a photocatalyst carrier in which a large number of fibrous bodies whose surfaces are coated with a photocatalyst are deposited on the surface of the substrate in a standing state. (Japanese Patent Laid-Open No. 2003-205244).
As shown in FIG. 10, the photocatalyst carrier 60 is coated with a photocatalyst 64 made of anatase-type titanium oxide (TiO ₂ ) on the surface of a flat substrate 62 made of an appropriate material such as glass, resin, metal or the like. A large number of the elongated fibrous bodies 66 are attached in a standing state substantially perpendicularly to the surface of the base body 62 via an adhesive 68. As shown in FIGS. 11 and 12, the fibrous body 66 is configured by coating a photocatalyst 64 on the surface of a fiber 70 such as a glass fiber or a resin fiber.

上記光触媒担持体60における繊維状体66表面の光触媒64に、図示しない紫外線ランプ等からの紫外線が照射されると、光触媒64が活性化して該光触媒64表面に接触した空気や水の浄化を行うことができるのである。
特開２００３−２０５２４４号 When the photocatalyst 64 on the surface of the fibrous body 66 in the photocatalyst support 60 is irradiated with ultraviolet rays from an unillustrated ultraviolet lamp or the like, the photocatalyst 64 is activated to purify the air or water that is in contact with the photocatalyst 64 surface. It can be done.
JP 2003-205244 A

上記光触媒担持体60は、光触媒64で被覆された多数の繊維状体66を、基体62表面に対して略垂直に立設状態で被着したことから、基体62の表面積が、被着された多数の繊維状体66の表面積分増大することとなり、その結果、基体62表面に配置される光触媒64の表面積を拡大できるものであった。
しかしながら、光触媒による空気や水の浄化能力を向上させるためには光触媒の表面積をできるだけ拡大することが望ましいことから、基体に担持させる光触媒の表面積を、より一層大きく確保できる光触媒担持体の出現が望まれていた。 The photocatalyst carrier 60 was coated with a large number of fibrous bodies 66 coated with the photocatalyst 64 in a standing state substantially perpendicular to the surface of the base 62, so that the surface area of the base 62 was deposited. As a result, the surface integral of the large number of fibrous bodies 66 is increased, and as a result, the surface area of the photocatalyst 64 disposed on the surface of the substrate 62 can be increased.
However, since it is desirable to increase the surface area of the photocatalyst as much as possible in order to improve the ability of the photocatalyst to purify air and water, it is hoped that a photocatalyst carrier that can secure a much larger surface area of the photocatalyst supported on the substrate will appear. It was rare.

本発明は、上記要請に応えるためになされたものであり、その目的とするところは、担持する光触媒の表面積を大きく確保することのできる光触媒担持体の実現にある。 The present invention has been made to meet the above-mentioned demands, and its object is to realize a photocatalyst carrier that can ensure a large surface area of the photocatalyst to be carried.

上記の目的を達成するため、本発明に係る光触媒担持体は、連結部を介して、内部が中空の凸部が多数形成された透光性の第１のシート部材と、第２のシート部材とを備え、上記第１のシート部材の凸部の開口を、上記第２のシート部材で閉塞することにより、第１のシート部材の凸部と第２のシート部材間に空間を形成して成る光触媒担持体であって、上記第１のシート部材を、光触媒を担持して成る繊維の集合体で構成し、また、上記空間内に、透光性の多孔質吸着材を多数配置すると共に、上記多孔質吸着材の表面及び細孔内に光触媒を担持せしめて成ることを特徴とする。
上記繊維の集合体としては、不織布が好ましく、この場合、不織布を構成する繊維に光触媒を担持させる。 In order to achieve the above object, a photocatalyst carrier according to the present invention includes a translucent first sheet member and a second sheet member each having a plurality of hollow convex portions formed therein via a connecting portion. And forming a space between the convex portion of the first sheet member and the second sheet member by closing the opening of the convex portion of the first sheet member with the second sheet member. The first sheet member is composed of a fiber assembly formed by supporting a photocatalyst, and a large number of translucent porous adsorbents are disposed in the space. The photocatalyst is supported on the surface and pores of the porous adsorbent.
The aggregate of the fibers is preferably a nonwoven fabric. In this case, a photocatalyst is supported on the fibers constituting the nonwoven fabric.

上記多孔質吸着材としては、シリカゲル又は多孔質ガラスが該当する。また、上記空間内に、多孔質吸着材と共に反射材を収納しても良い。 Silica gel or porous glass corresponds to the porous adsorbent. Moreover, you may store a reflecting material with the porous adsorbent in the said space.

本発明の光触媒担持体にあっては、第１のシート部材を、単位体積当たりの繊維の表面積が大きい繊維の集合体で構成すると共に、該繊維の集合体に光触媒を担持させ、また、第１のシート部材の凸部と第２のシート部材間に形成した空間内に比表面積が極めて大きい多孔質吸着材を多数収納すると共に、これら多孔質吸着材の表面及び細孔内に光触媒を担持させたことから、担持する光触媒の表面積を大きく確保することができる。 In the photocatalyst carrier of the present invention, the first sheet member is composed of an aggregate of fibers having a large surface area per unit volume, and the photocatalyst is supported on the aggregate of fibers. A large number of porous adsorbents having a very large specific surface area are accommodated in the space formed between the convex part of the first sheet member and the second sheet member, and a photocatalyst is supported on the surface and pores of these porous adsorbents. Therefore, a large surface area of the supported photocatalyst can be secured.

多数の繊維が立体的に絡み合って形成された不織布を、上記繊維の集合体として用い、
該不織布を構成する繊維に光触媒を担持させた場合には、単位体積当たりの繊維の表面積が極めて大きいことから、担持する光触媒の表面積を極めて大きく確保することができる。 Using a nonwoven fabric formed by three-dimensionally intertwining a large number of fibers as an assembly of the fibers,
When the photocatalyst is supported on the fibers constituting the nonwoven fabric, since the surface area of the fiber per unit volume is extremely large, it is possible to ensure a very large surface area of the supported photocatalyst.

上記空間内に、多孔質吸着材と共に反射材を収納することにより、光触媒を活性化させる光を様々な方向に反射させて、多孔質吸着材に担持された光触媒への照射効率を向上させることができる。 By storing the reflective material together with the porous adsorbent in the space, the light that activates the photocatalyst is reflected in various directions, and the irradiation efficiency to the photocatalyst carried on the porous adsorbent is improved. Can do.

以下、図面に基づき、本発明に係る光触媒担持体の実施形態を説明する。
図１乃至図３は、本発明に係る光触媒担持体10を示すものであり、該光触媒担持体10は、平板シートに連結部12を介して、内部が中空と成された断面略波形の凸部14が、所定間隔でマトリックス状に多数形成された透光性を有する第１のシート部材16と、透光性を有する平板な第２のシート部材18とを備えている。そして、上記第１のシート部材16の連結部12に、第２のシート部材18を接着して接合することにより、上記凸部14の開口を第２のシート部材18で閉塞し、以て、第１のシート部材16の凸部14と第２のシート部材18間に空間20を形成して成る。 Hereinafter, an embodiment of a photocatalyst carrier according to the present invention will be described with reference to the drawings.
FIGS. 1 to 3 show a photocatalyst carrier 10 according to the present invention. The photocatalyst carrier 10 is a convex plate having a substantially corrugated cross-section with a hollow inside through a connecting part 12. The portion 14 includes a first sheet member 16 having translucency, which is formed in a matrix at predetermined intervals, and a second sheet member 18 having a translucency and a flat plate. Then, by bonding and joining the second sheet member 18 to the connecting portion 12 of the first sheet member 16, the opening of the convex portion 14 is blocked by the second sheet member 18, A space 20 is formed between the convex portion 14 of the first sheet member 16 and the second sheet member 18.

上記第１のシート部材16及び第２のシート部材18は、アナターゼ型の酸化チタン（ＴｉＯ_２）等より成る光触媒を担持して成る繊維の集合体としての不織布で構成されている。
図４及び図５に示すように、不織布22は、多数の繊維24が立体的に絡み合って形成されるものであり、繊維24間には多数の空隙26（図５参照）が形成されており、また、多数の繊維24が立体的に絡み合っているため、単位体積当たりの繊維24の表面積が極めて大きいものである。
尚、不織布22を構成する繊維24の繊維密度や、不織布の厚さ、目付等を適宜調整することにより、不織布22を構成する繊維24の総表面積を任意に増減可能である。
不織布22を構成する繊維24の表面に、光触媒28は被着・担持されているものであり、図６に示すように、光触媒28は、繊維24の表面に緻密な膜状態で被着・担持される場合の他、繊維24表面の光触媒28の粒子間に微小な隙間が存在する状態で粗く被着・担持される場合もある（図示省略）。 The first sheet member 16 and the second sheet member 18 are made of a non-woven fabric as an aggregate of fibers formed by supporting a photocatalyst made of anatase type titanium oxide (TiO ₂ ) or the like.
As shown in FIGS. 4 and 5, the nonwoven fabric 22 is formed by tangling a large number of fibers 24, and a large number of voids 26 (see FIG. 5) are formed between the fibers 24. In addition, since a large number of fibers 24 are intertwined in three dimensions, the surface area of the fibers 24 per unit volume is extremely large.
The total surface area of the fibers 24 constituting the nonwoven fabric 22 can be arbitrarily increased or decreased by appropriately adjusting the fiber density of the fibers 24 constituting the nonwoven fabric 22, the thickness of the nonwoven fabric, the basis weight, and the like.
The photocatalyst 28 is deposited and supported on the surface of the fiber 24 constituting the nonwoven fabric 22, and the photocatalyst 28 is deposited and supported on the surface of the fiber 24 in a dense film state as shown in FIG. In addition to the above, there are cases where the fine particles are deposited and supported roughly in the presence of minute gaps between the particles of the photocatalyst 28 on the surface of the fiber 24 (not shown).

不織布22を構成する繊維24は、ナイロン、ポリエステル、アクリル、ポリプロピレン、ポリ塩化ビニル等の樹脂繊維、レーヨン等のセルロース系の化学繊維、ガラス繊維、金属繊維等の短繊維を用いることができ、その直径は５〜２０μｍ、長さは０．５〜２０mm程度である。尚、長さが５０〜１００mm程度の長繊維から成る繊維24を用いることも勿論可能である。 As the fibers 24 constituting the nonwoven fabric 22, resin fibers such as nylon, polyester, acrylic, polypropylene and polyvinyl chloride, cellulosic chemical fibers such as rayon, short fibers such as glass fibers and metal fibers can be used. The diameter is about 5 to 20 μm, and the length is about 0.5 to 20 mm. Of course, it is also possible to use fibers 24 made of long fibers having a length of about 50 to 100 mm.

不織布22を構成する繊維24の表面に光触媒28を担持させるには、例えば、光触媒28の分散樹脂液中に不織布22を浸漬した後乾燥させたり、不織布22の上方から、光触媒28の分散樹脂液を滴下した後乾燥させることにより行うことができる。
また、不織布22を加熱して、該不織布22を構成する繊維24の表面を溶融させた状態で光触媒28を吹き付けることにより、不織布22を構成する繊維24の表面に光触媒28を被着・担持させることもできる。
さらに、高温加熱した光触媒28を不織布22に吹きつけ、不織布22を構成する繊維24を一部溶融させることにより、不織布22を構成する繊維24の表面に光触媒28を被着・担持させても良い。 In order to carry the photocatalyst 28 on the surface of the fiber 24 constituting the nonwoven fabric 22, for example, the nonwoven fabric 22 is dipped in the dispersion resin liquid of the photocatalyst 28 and then dried, or the dispersion resin liquid of the photocatalyst 28 is applied from above the nonwoven fabric 22. It can carry out by making it dry after dripping.
Further, by heating the nonwoven fabric 22 and spraying the photocatalyst 28 in a state in which the surface of the fiber 24 constituting the nonwoven fabric 22 is melted, the photocatalyst 28 is deposited and supported on the surface of the fiber 24 constituting the nonwoven fabric 22. You can also.
Further, the photocatalyst 28 may be attached to and supported on the surface of the fiber 24 constituting the nonwoven fabric 22 by spraying the photocatalyst 28 heated at a high temperature onto the nonwoven fabric 22 and partially melting the fibers 24 constituting the nonwoven fabric 22. .

尚、上記においては、不織布22を構成する繊維24の表面に光触媒28を担持せしめた場合を説明したが、これに限定されるものではなく、例えば、セルロース系の化学繊維であり、多数の孔を備えた多孔質構造を有するレーヨン繊維に粒子状の光触媒28を練り混むことにより、繊維24に光触媒28を担持させても良い。この場合、光触媒28は、レーヨン繊維で構成された繊維24の表面のみならず、レーヨン繊維中にも担持されることとなるが、上記の通り、レーヨン繊維は多孔質構造であるため、孔を介して、繊維24中に練り混まれた光触媒28にも光触媒活性化作用を有する波長の光を照射して活性化できると共に、空気や水と接触させて浄化を行うことができる。 In the above description, the case where the photocatalyst 28 is carried on the surface of the fiber 24 constituting the nonwoven fabric 22 has been described. However, the present invention is not limited to this. The photocatalyst 28 may be supported on the fiber 24 by kneading and mixing the particulate photocatalyst 28 with a rayon fiber having a porous structure. In this case, the photocatalyst 28 is supported not only on the surface of the fiber 24 composed of the rayon fiber but also in the rayon fiber. As described above, since the rayon fiber has a porous structure, it has pores. Thus, the photocatalyst 28 kneaded in the fiber 24 can be activated by being irradiated with light having a wavelength having a photocatalytic activation effect, and can be purified by contacting with air or water.

第１のシート部材16の凸部14と第２のシート部材18間に形成された空間20内には、アナターゼ型の酸化チタン（ＴｉＯ_２）等より成る光触媒（図示せず）を担持して成る透光性の多孔質吸着材30が多数収納されている。
上記透光性の多孔質吸着材30は、径が１０ｎｍ〜５０ｎｍ程度の細孔を多数有する直径０．１ｍｍ〜５ｍｍ程度のビーズ状のシリカゲルで構成されており、細孔の比表面積が５０ｍ^２／ｇ〜３００ｍ^２／ｇ程度と極めて大きいものである。光触媒は、上記多孔質吸着材30の表面のみならず、細孔内にも吸着担持されている。
上記多孔質吸着材30の表面及び細孔内に光触媒を担持させるには、例えば、粒径が多孔質吸着材30の細孔径より小さい光触媒微粒子の分散液中に、多孔質吸着材30を浸漬した後、乾燥・焼成させることにより行うことができる。 A space 20 formed between the convex portion 14 of the first sheet member 16 and the second sheet member 18 carries a photocatalyst (not shown) made of anatase-type titanium oxide (TiO ₂ ) or the like. A large number of translucent porous adsorbents 30 are accommodated.
The translucent porous adsorbent 30 is composed of bead-shaped silica gel having a diameter of about 0.1 mm to 5 mm having a large number of pores having a diameter of about 10 nm to 50 nm, and the specific surface area of the pores is 50 m ^2. / G to about 300 m ² / g. The photocatalyst is adsorbed and supported not only on the surface of the porous adsorbent 30 but also in the pores.
In order to support the photocatalyst on the surface and pores of the porous adsorbent 30, for example, the porous adsorbent 30 is immersed in a dispersion of photocatalyst fine particles whose particle diameter is smaller than the pore diameter of the porous adsorbent 30. Then, it can be performed by drying and firing.

上記多孔質吸着材30を空間20内に収納するには、第１のシート部材16の凸部14を下向きとした状態で、該凸部14内に多孔質吸着材30を収納し、その後、第１のシート部材16上に第２のシート部材18を積層して接着すれば良い。
尚、第１のシート部材16及び第２のシート部材18を構成する不織布を、ポリプロピレン、ポリエステル等の熱可塑性樹脂より成る繊維で構成すれば、第１のシート部材16上に第２のシート部材18を積層・圧接した状態で加熱することにより、第１のシート部材16及び第２のシート部材18を構成する熱可塑性樹脂より成る繊維同士が溶着して、簡単に両シート部材12，18を接着することができる。 In order to store the porous adsorbent 30 in the space 20, the porous adsorbent 30 is stored in the convex portion 14 with the convex portion 14 of the first sheet member 16 facing downward, and then The second sheet member 18 may be laminated and bonded on the first sheet member 16.
In addition, if the nonwoven fabric which comprises the 1st sheet member 16 and the 2nd sheet member 18 is comprised with the fiber which consists of thermoplastic resins, such as a polypropylene and polyester, the 2nd sheet member will be on the 1st sheet member 16 By heating 18 in a state where they are laminated and pressed, the fibers made of the thermoplastic resin constituting the first sheet member 16 and the second sheet member 18 are welded together, and the two sheet members 12 and 18 can be easily attached. Can be glued.

図７は、本発明の光触媒担持体10の変形例を示すものであり、この光触媒担持体10の変形例は、多孔質吸着材30と共に複数のビーズ状の反射材32を、上記空間20内に収納した点に特徴を有するものである。
上記反射材32は、アルミニウム等の光反射率の高い材料で構成することができる。また、表面が光反射率の高い白色と成された部材で反射材32を構成しても良い。
このように、多孔質吸着材30と共に反射材32を配置することにより、光触媒を活性化させる光を様々な方向に反射させて、多孔質吸着材30に保持された光触媒への照射効率を向上させることができる。 FIG. 7 shows a modification of the photocatalyst carrier 10 according to the present invention. This modification of the photocatalyst carrier 10 includes a porous adsorbent 30 and a plurality of bead-like reflectors 32 in the space 20. It has the characteristics in the point accommodated in.
The reflector 32 can be made of a material having high light reflectance such as aluminum. Further, the reflecting material 32 may be formed of a member whose surface is white with high light reflectance.
Thus, by arranging the reflective material 32 together with the porous adsorbent 30, the light that activates the photocatalyst is reflected in various directions, and the irradiation efficiency to the photocatalyst held by the porous adsorbent 30 is improved. Can be made.

上記においては、第１のシート部材16に形成された多数の凸部14の開口を閉塞するため１枚の平板な第２のシート部材18を用いた場合を例に挙げたが、図８及び図９に示すように、複数枚の第２のシート部材18を用意し、斯かる複数枚の第２のシート部材18を、第１のシート部材16の連結部12に接着することにより、上記凸部14の開口を第２のシート部材18で閉塞し、以て、第１のシート部材16の凸部14と第２のシート部材18間に空間20を形成するようにしても良い。 In the above description, the case where one flat second sheet member 18 is used to close the openings of the many convex portions 14 formed in the first sheet member 16 is described as an example. As shown in FIG. 9, a plurality of second sheet members 18 are prepared, and the plurality of second sheet members 18 are bonded to the connecting portion 12 of the first sheet member 16, thereby The opening of the convex portion 14 may be closed by the second sheet member 18, and thus a space 20 may be formed between the convex portion 14 of the first sheet member 16 and the second sheet member 18.

上記多孔質吸着材30は、シリカゲル以外に、バイコールガラス等のｎｍ単位の多数の細孔を有する多孔質ガラスで構成しても良い。 The porous adsorbent 30 may be made of porous glass having a large number of pores in nm units such as Vycor glass in addition to silica gel.

尚、本発明の光触媒担持体10を、空気等の気体の浄化用に使用する場合には、上記多孔質吸着材30の表面をシリコン樹脂や、テトラフルオロエチレンの重合体（ポリテトラフルオロエチレン、ＰＴＦＥ）であるテフロン（登録商標）等の撥水性のある気体透過性樹脂で被覆しても良い。
このように、多孔質吸着材30の表面を撥水性のある気体透過性樹脂で被覆すると、多孔質吸着材30が空気中の水分を細孔内に吸着することが抑制され、その結果、浄化対象の気体を効率よく細孔内に吸着して、細孔内の光触媒と接触させることができる。 When the photocatalyst carrier 10 of the present invention is used for purifying a gas such as air, the surface of the porous adsorbent 30 is made of silicon resin or tetrafluoroethylene polymer (polytetrafluoroethylene, You may coat | cover with water-repellent gas-permeable resin, such as Teflon (trademark) which is PTFE).
As described above, when the surface of the porous adsorbent 30 is coated with a water-repellent gas-permeable resin, the porous adsorbent 30 is prevented from adsorbing moisture in the air into the pores, and as a result, purification. The target gas can be efficiently adsorbed in the pores and brought into contact with the photocatalyst in the pores.

上記光触媒としては、上記の酸化チタン以外に、ＺｎＯ、ＳｒＴｉＯ_３、ＢａＴｉＯ_３、Ｆｅ_２Ｏ_３等、光触媒作用を有する他の金属酸化物を用いることができるが、アナターゼ型の酸化チタンが、光触媒活性に優れており最も好適に使用できる。
また、光触媒は、紫外線の照射を受けて活性化する光触媒だけでなく、可視光の照射を受けて活性化する可視光型光触媒を用いることもできる。 As the photocatalyst, other metal oxides having a photocatalytic action such as ZnO, SrTiO ₃ , BaTiO ₃ , Fe ₂ O _{3 and the} like can be used in addition to the above titanium oxide, but anatase type titanium oxide is a photocatalyst. It is excellent in activity and can be used most preferably.
Further, as the photocatalyst, not only a photocatalyst activated by irradiation with ultraviolet rays but also a visible light photocatalyst activated by irradiation with visible light can be used.

而して、本発明の光触媒担持体10に、光触媒活性化作用を有する波長の光（紫外線や可視光）が照射されると、第１のシート部材16及び第２のシート部材18を構成する不織布22の繊維24表面に担持された光触媒28が活性化する。また、透光性を有する第１のシート部材16及び第２のシート部材18を透過した光が、上記空間20内の多孔質吸着材30に照射され、該多孔質吸着材30に担持された光触媒が活性化する。この結果、活性化した光触媒に接触した空気や水の浄化を行うことができるのである。
上記第１のシート部材16及び第２のシート部材18を構成する不織布22は通気性、通水性に優れていることから、光触媒28と、空気や水との接触効率が良好である。
また、上記多孔質吸着材30は透光性を有していることから、細孔内に保持した光触媒にも光を十分に照射することが可能である。また、多数の細孔を有する多孔質吸着材30は、通気性、通水性に優れていることから、光触媒と、空気や水との接触効率が良好で
ある。
尚、上記の通り、第１のシート部材16及び第２のシート部材18を構成する不織布22は、繊維24間に多数の空隙26が形成されているため透光性に優れており、上記空隙26を介して、空間20内の多孔質吸着材30に光触媒活性化作用を有する波長の光を十分に照射することができる。透光性を一層向上させるため、不織布22を構成する繊維24を、透光性材料で構成するのが好ましい。 Thus, when the photocatalyst carrier 10 of the present invention is irradiated with light having a wavelength having a photocatalytic activation effect (ultraviolet light or visible light), the first sheet member 16 and the second sheet member 18 are formed. The photocatalyst 28 supported on the surface of the fiber 24 of the nonwoven fabric 22 is activated. Further, the light transmitted through the first sheet member 16 and the second sheet member 18 having translucency is irradiated to the porous adsorbent 30 in the space 20 and is carried on the porous adsorbent 30. The photocatalyst is activated. As a result, it is possible to purify the air and water that are in contact with the activated photocatalyst.
Since the nonwoven fabric 22 constituting the first sheet member 16 and the second sheet member 18 is excellent in air permeability and water permeability, the contact efficiency between the photocatalyst 28 and air or water is good.
Further, since the porous adsorbent 30 has translucency, the photocatalyst held in the pores can be sufficiently irradiated with light. Further, since the porous adsorbent 30 having a large number of pores is excellent in air permeability and water permeability, the contact efficiency between the photocatalyst and air or water is good.
As described above, the non-woven fabric 22 constituting the first sheet member 16 and the second sheet member 18 is excellent in translucency because a large number of voids 26 are formed between the fibers 24. Via 26, the porous adsorbent 30 in the space 20 can be sufficiently irradiated with light having a wavelength having a photocatalytic activation effect. In order to further improve the translucency, it is preferable that the fibers 24 constituting the nonwoven fabric 22 are composed of a translucent material.

本発明の光触媒担持体10にあっては、第１のシート部材16及び第２のシート部材18を、単位体積当たりの繊維24の表面積が極めて大きい不織布22で構成し、該不織布22を構成する繊維24の表面に光触媒28を担持させると共に、比表面積が極めて大きい多孔質吸着材30を上記空間20内に多数収納し、これら多孔質吸着材30の表面及び細孔内に光触媒を担持させたことから、担持する光触媒の表面積を極めて大きく確保することができる。 In the photocatalyst carrier 10 of the present invention, the first sheet member 16 and the second sheet member 18 are constituted by the nonwoven fabric 22 having a very large surface area of the fibers 24 per unit volume, and the nonwoven fabric 22 is constituted. While supporting the photocatalyst 28 on the surface of the fiber 24, a large number of porous adsorbents 30 having an extremely large specific surface area were accommodated in the space 20, and the photocatalyst was supported on the surfaces and pores of the porous adsorbents 30. For this reason, it is possible to ensure a very large surface area of the supported photocatalyst.

尚、上記の通り、多数の凸部14は、連結部12を介して第１のシート部材16に形成されているので、該第１のシート部材16の連結部12の箇所で、第１のシート部材16及び第２のシート部材18を切断すれば、適宜な大きさ、形状の光触媒担持体10を得ることができる。 Note that, as described above, since the plurality of convex portions 14 are formed on the first sheet member 16 via the connecting portion 12, the first projecting portion 14 is connected to the first sheet member 16 at the position of the connecting portion 12. If the sheet member 16 and the second sheet member 18 are cut, the photocatalyst carrier 10 having an appropriate size and shape can be obtained.

上記においては、第２のシート部材18も、第１のシート部材16と同様に、透光性を有し、光触媒28を担持した不織布22で構成した場合について説明したが、第２のシート部材18については、不透光性材料で構成したり、或いは、光触媒28を担持していない適宜な材料で構成しても良い。 In the above description, the second sheet member 18 is also made of a nonwoven fabric 22 having a light transmitting property and carrying a photocatalyst 28 as in the case of the first sheet member 16. 18 may be composed of an opaque material, or may be composed of an appropriate material not carrying the photocatalyst 28.

また、上記においては、第１のシート部材16及び第２のシート部材18を構成する繊維の集合体として、不織布22を用いた場合を例に挙げて説明したが、本発明はこれに限定されるものではなく、多数の繊維を織り込んで形成した織布を用い、該織布を構成する繊維に光触媒28を担持させても良い。この織布も、不織布22には及ばないものの、単位体積当たりの繊維の表面積が大きいものである。 Further, in the above description, the case where the nonwoven fabric 22 is used as the aggregate of the fibers constituting the first sheet member 16 and the second sheet member 18 has been described as an example. Instead of this, a woven fabric formed by weaving a large number of fibers may be used, and the photocatalyst 28 may be supported on the fibers constituting the woven fabric. Although this woven fabric does not reach the nonwoven fabric 22, the surface area of the fibers per unit volume is large.

本発明に係る光触媒担持体を模式的に示す平面図である。It is a top view which shows typically the photocatalyst carrier based on this invention. 図１のＡ−Ａ部分拡大断面図である。It is an AA partial expanded sectional view of FIG. 図１のＢ−Ｂ部分拡大断面図である。It is a BB partial expanded sectional view of FIG. 光触媒を担持した不織布を模式的に示す部分拡大図である。It is the elements on larger scale which show typically the nonwoven fabric which carry | supported the photocatalyst. 不織布を構成する繊維を模式的に示す拡大図である。It is an enlarged view which shows typically the fiber which comprises a nonwoven fabric. 不織布を構成する繊維を模式的に示す断面図である。It is sectional drawing which shows typically the fiber which comprises a nonwoven fabric. 本発明に係る光触媒担持体の変形例を模式的に示す部分拡大断面図である。It is a partial expanded sectional view which shows typically the modification of the photocatalyst carrier based on this invention. 第２のシート部材の変形例を模式的に示す部分拡大断面図である。It is a partial expanded sectional view showing typically the modification of the 2nd sheet member. 第２のシート部材の変形例を模式的に示す部分拡大断面図である。It is a partial expanded sectional view showing typically the modification of the 2nd sheet member. 従来の光触媒担持体を示す断面図である。It is sectional drawing which shows the conventional photocatalyst carrier. 従来の光触媒担持体における繊維状体の拡大縦断面図である。It is an expanded longitudinal cross-sectional view of the fibrous body in the conventional photocatalyst carrier. 従来の光触媒担持体における繊維状体の拡大横断面図である。It is an expansion cross-sectional view of the fibrous body in the conventional photocatalyst carrier.

Explanation of symbols

10 光触媒担持体
12 連結部
14 凸部
16 第１のシート部材
18 第２のシート部材
20 空間
22 不織布
24 繊維
26 空隙
28 光触媒
30 多孔質吸着材
32 反射材

10 Photocatalyst carrier
12 Connecting part
14 Convex
16 First sheet member
18 Second sheet member
20 spaces
22 Nonwoven fabric
24 fibers
26 Air gap
28 Photocatalyst
30 Porous adsorbent
32 Reflector

Claims

A translucent first sheet member having a plurality of hollow convex portions formed therein via a connecting portion, and a second sheet member, the opening of the convex portion of the first sheet member, A photocatalyst carrier formed by closing the second sheet member to form a space between the convex portion of the first sheet member and the second sheet member, wherein the first sheet member is In addition, a large number of translucent porous adsorbents are arranged in the space, and a photocatalyst is supported on the surface and pores of the porous adsorbent. A photocatalyst carrier characterized by comprising:

2. The photocatalyst carrier according to claim 1, wherein the aggregate of fibers is a non-woven fabric, and a photocatalyst is supported on the fibers constituting the non-woven fabric.

The photocatalyst carrier according to claim 1 or 2, wherein the porous adsorbent is silica gel or porous glass.

The photocatalyst carrier according to any one of claims 1 to 3, wherein a reflective material is housed together with the porous adsorbent in the space.