JP2006061784A - Photocatalytic device, irradiation method of exciting light, method for decomposing object to be decomposed and use of the photocatalytic device - Google Patents
Photocatalytic device, irradiation method of exciting light, method for decomposing object to be decomposed and use of the photocatalytic device Download PDFInfo
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- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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Abstract
Description
本発明は、光触媒を用いて悪臭原因物質などの分解対象物を効率よく分解除去する光触媒装置、励起光の照射方法、分解対象物分解方法、光触媒装置を用いた脱臭装置、空気清浄装置、浄水器及び排水浄化装置に関する。 The present invention relates to a photocatalyst device that efficiently decomposes and removes decomposition target substances such as odor-causing substances using a photocatalyst, an excitation light irradiation method, a decomposition target decomposition method, a deodorization device that uses a photocatalyst device, an air purification device, and water purification The present invention relates to a vessel and a waste water purification device.
酸化チタンなどの光触媒は、紫外光を照射することで強力な酸化作用を発揮し、ガス中の悪臭原因物質を分解する脱臭や、排水中の環境汚染物質を分解する浄水などに利用する方法が広く検討されている。 Photocatalysts such as titanium oxide exert a strong oxidizing action by irradiating with ultraviolet light, and there are methods that can be used for deodorization to decompose malodorous substances in gas and water purification to decompose environmental pollutants in wastewater. Widely studied.
光触媒を励起する光源は、従来より、発光ダイオード(以下、LEDと記す。)、ブラックライト、水銀灯などが用いられている(例えば、特許文献1,2参照。)。
これらの中でも、LEDは、長寿命であり、電気−光変換効率が高く、コンパクトであるため、光触媒装置用光源として期待されている。またLEDは、年々、出力や照度が高いものが開発されており、これを用いることで高い光触媒効果を得ることが期待できる。
Among these, the LED is expected as a light source for a photocatalytic device because it has a long life, high electric-light conversion efficiency, and is compact. In addition, LEDs with high output and illuminance have been developed year by year, and it can be expected that a high photocatalytic effect will be obtained by using these LEDs.
ところで、従来の光触媒装置では、高出力光源から光触媒担持体に直接、高照度の励起光を照射する構造であった。通常、分解対象となるガス及び液中の分解対象物濃度は比較的希薄であるため、分解対象物の拡散により分解速度が律速され、高出力・高照度の光を用いて励起しても、折角励起した電子、ホールが再結合してしまい、光量の一部もしくは大部分が無駄になっているという問題があった。 By the way, in the conventional photocatalyst apparatus, it was the structure which irradiates excitation light of high illumination intensity directly to a photocatalyst support body from a high output light source. Normally, the concentration of the decomposition target in the gas and liquid to be decomposed is relatively dilute, so the decomposition rate is limited by the diffusion of the decomposition target, and even when excited using light with high output and high illuminance, There has been a problem in that electrons or holes that have been bent are recombined, and a part or most of the amount of light is wasted.
本発明は前記事情に鑑みてなされ、励起光を効率よく利用して高い光触媒効果を得ることができる光触媒装置の提供を目的とする。 This invention is made | formed in view of the said situation, and it aims at provision of the photocatalyst apparatus which can acquire a high photocatalyst effect using an excitation light efficiently.
前記目的を達成するため、本発明は、板状の光触媒担持体と、一端から入射された光を任意の面に設けられた拡散因子により拡散して漏光させる拡散板とを、分解対象物質を含む流体が通過可能なスペースを設けた状態で交互に複数枚重ねて積層し、各拡散板の一端を束ねて入射口が形成された光触媒装置本体と、該光触媒装置本体の入射口に励起光を入射可能に設けられた励起光源とを備えたことを特徴とする光触媒装置を提供する。 In order to achieve the above-mentioned object, the present invention provides a plate-like photocatalyst carrier and a diffusion plate that diffuses light incident from one end by a diffusion factor provided on an arbitrary surface and leaks light. The photocatalyst apparatus main body in which a plurality of layers are alternately stacked with a space through which the contained fluid can pass, and one end of each diffusion plate is bundled to form an entrance, and excitation light is incident on the entrance of the photocatalyst apparatus The photocatalyst device is provided with an excitation light source provided so as to be incident.
本発明の光触媒装置において、前記拡散板がアクリルシートからなり、前記拡散因子がシート表面にサンドブラスト処理により形成された凹凸であることが好ましい。 In the photocatalyst device of the present invention, it is preferable that the diffusion plate is made of an acrylic sheet, and the diffusion factor is unevenness formed on the sheet surface by sandblasting.
本発明の光触媒装置において、前記拡散板がフッ素樹脂シートからなり、前記拡散因子がシート内部に混入されたシート材よりも屈折率の高い樹脂粒子であることが好ましい。 In the photocatalyst device of the present invention, the diffusion plate is preferably made of a fluororesin sheet, and the diffusion factor is preferably resin particles having a higher refractive index than the sheet material mixed in the sheet.
本発明の光触媒装置において、前記光触媒担持体がコルゲート基板の表面に光触媒をコーティングしてなることが好ましい。 In the photocatalyst device of the present invention, the photocatalyst support is preferably formed by coating the surface of a corrugated substrate with a photocatalyst.
また本発明は、前述した本発明に係る光触媒装置を用い、前記入射口から高照度で入射した励起光を拡散板から低照度で光触媒担持体に照射させることを特徴とする励起光の照射方法を提供する。 Further, the present invention uses the photocatalyst device according to the present invention described above, and irradiates the photocatalyst support with low illuminance from the diffusion plate with excitation light incident at high illuminance from the incident port. I will provide a.
本発明の励起光の照射方法において、拡散板から光触媒担持体に照射される光の照度が0.3mW/cm2以下であることが好ましい。 In the excitation light irradiation method of the present invention, it is preferable that the illuminance of light irradiated from the diffusion plate to the photocatalyst carrier is 0.3 mW / cm 2 or less.
また本発明は、前述した本発明に係る光触媒装置を用意し、前記励起光源を点灯し、前記光触媒担持体と拡散板との間のスペースに分解対象物質を含む流体を流し、前記入射口から高照度で入射した励起光を拡散板から低照度で光触媒担持体に照射して光触媒機能を発現させ、分解対象物を分解することを特徴とする光触媒による分解対象物分解方法を提供する。 Further, the present invention provides a photocatalyst device according to the present invention described above, turns on the excitation light source, flows a fluid containing a substance to be decomposed into a space between the photocatalyst carrier and the diffusion plate, and There is provided a method for decomposing an object to be decomposed by a photocatalyst, which comprises irradiating a photocatalyst carrier with excitation light incident at high illuminance from a diffuser plate at low illuminance to develop a photocatalytic function and decompose the object to be decomposed.
本発明の光触媒による分解対象物分解方法において、流体中の分解対象物濃度が10ppm未満であり、拡散板から光触媒担持体に照射される光の照度が0.3mW/cm2以下であることが好ましい。 In the decomposition target decomposition method using the photocatalyst of the present invention, the concentration of the decomposition target in the fluid is less than 10 ppm, and the illuminance of light irradiated from the diffusion plate to the photocatalyst support is 0.3 mW / cm 2 or less. preferable.
また本発明は、前述した本発明に係る光触媒装置を含むことを特徴とする、脱臭装置、空気清浄装置、浄水器及び排水浄化装置を提供する。 The present invention also provides a deodorizing device, an air purifying device, a water purifier, and a waste water purifying device characterized by including the above-described photocatalytic device according to the present invention.
本発明の光触媒装置は、板状の光触媒担持体と、一端から入射された光を任意の面に設けられた拡散因子により拡散して漏光させる拡散板とを、分解対象物質を含む流体が通過可能なスペースを設けた状態で交互に複数枚重ねて積層するとともに、各拡散板の一端を束ねて入射口が形成された光触媒装置本体と、該光触媒装置本体の入射口に励起光を入射可能に設けられた励起光源とを備えたものなので、その入射口から高照度で入射した励起光を拡散板から低照度で光触媒担持体に照射することで、励起光を効率よく利用して高い光触媒効果を得ることができる。 The photocatalyst device of the present invention passes through a plate-like photocatalyst carrier and a diffusion plate that diffuses light incident from one end by a diffusion factor provided on an arbitrary surface to leak light, and a fluid containing a decomposition target substance passes through the plate. A plurality of layers are alternately stacked with a possible space provided, and one end of each diffusion plate is bundled to form a photocatalyst device main body, and excitation light can be incident on the photocatalyst device main body. The photocatalyst carrier is irradiated with high-illuminance excitation light from the entrance through the diffuser plate to the photocatalyst carrier with low illuminance. An effect can be obtained.
本発明の励起光の照射方法は、前述した本発明に係る光触媒装置を用い、前記入射口から高照度で入射した励起光を拡散板から低照度で光触媒担持体に照射させることによって、励起光を効率よく利用して高い光触媒効果を得ることができる。 The excitation light irradiation method of the present invention uses the above-described photocatalyst device according to the present invention, and irradiates the photocatalyst carrier with excitation light incident at high illuminance from the entrance through the diffuser plate at low illuminance. Can be used efficiently to obtain a high photocatalytic effect.
本発明の光触媒による分解対象物分解方法は、前述した本発明に係る光触媒装置を用意し、前記励起光源を点灯し、前記光触媒担持体と拡散板との間のスペースに分解対象物質を含む流体を流し、前記入射口から高照度で入射した励起光を拡散板から低照度で光触媒担持体に照射して光触媒機能を発現させ、分解対象物を分解することによって、励起光を効率よく利用して高い光触媒効果を得ることができる。 In the method for decomposing an object to be decomposed by the photocatalyst of the present invention, the above-described photocatalytic device according to the present invention is prepared, the excitation light source is turned on, and the fluid containing the decomposition target substance in the space between the photocatalyst carrier and the diffusion plate The photocatalyst support is developed by irradiating the photocatalyst carrier with low illuminance with the excitation light incident at high illuminance from the entrance, and the excitation light is efficiently utilized by decomposing the decomposition target. High photocatalytic effect.
また本発明は、前述した本発明に係る光触媒装置を備えたことによって、励起光を効率よく利用して高い光触媒効果を得ることができる脱臭装置、空気清浄装置、浄水器及び排水浄化装置を提供できる。 In addition, the present invention provides a deodorizing device, an air purifying device, a water purifier, and a waste water purifying device that can obtain a high photocatalytic effect by efficiently using excitation light by including the above-described photocatalytic device according to the present invention. it can.
以下、図面を参照して本発明の実施形態を説明する。
図1は、本発明に係る光触媒装置の一実施形態を示す図である。図1中、符号1は光触媒装置、2は光触媒装置本体、3は励起光源、4は光触媒担持体、5は拡散板、6は入射口である。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a photocatalytic device according to the present invention. In FIG. 1,
本実施形態の光触媒装置1は、コルゲート板(波板)状の光触媒担持体4と、一端から入射された光を任意の面に設けられた拡散因子により拡散して漏光させる拡散板5とを、分解対象物質を含む流体が通過可能なスペースを設けた状態で交互に複数枚重ねて積層するとともに、各拡散板5の一端を束ねて入射口6が形成された光触媒装置本体2と、該光触媒装置本体2の入射口6に励起光を入射可能に設けられた励起光源3とから構成されている。本実施形態の光触媒装置1は、LEDなどの高出力光源から出射された高照度の励起光が、多層に積層された拡散板5によって分配され、大面積な拡散面から低照度で光触媒担持体4に照射される構造になっている。
The
前記光触媒担持体4は、コルゲート基板の表面に酸化チタンなどの光触媒をコーティングして作製されたものである。コルゲート基板に担持する光触媒としては、酸化チタン(TiO2)、酸化タンタル、酸化スズ、酸化ジルコニウム、酸化ニオブ、酸化バナジウム、チタン酸バリウム(BaTi4O9)、チタン酸ストロンチウム(SrTiO3)、チタン酸ナトリウム(Na2Ti6O13)、二酸化ジルコニウム、硫化カドミウム、α−Fe2O3、酸化亜鉛(ZnO)などが挙げられ、この中でも酸化チタンが好ましい。酸化チタンからなる光触媒を塗布する場合、酸化チタン微粒子を含む市販の光触媒コーティング液を用いることができ、膜厚やコーティング回数などは所定の条件にしたがって形成すればよい。
The
なお、本実施形態ではコルゲート基板の表面に酸化チタンなどの光触媒をコーティングして作製された光触媒担持体4を用い、これを平板状の拡散板5と交互に重ねて積層することで、分解対象物質を含む流体が通過可能なスペースが設けられた光触媒装置本体2を構成しているが、光触媒装置本体2の構造は本例示に限定されるものではなく、互いに平板状の光触媒担持体4と拡散板5とを、適当なスペーサを介して積み重ね、流体が通過可能なスペースが設けられた光触媒装置本体2を構成することもできる。
また、前記コルゲート基材の材料は限定されず、熱可塑性樹脂シートやアルミ合金板などを波板上に成形加工した基板を適宜選択して用いることができる。
In this embodiment, a
Moreover, the material of the said corrugated base material is not limited, The board | substrate which shape-processed the thermoplastic resin sheet, the aluminum alloy plate, etc. on the corrugated sheet can be selected suitably, and can be used.
前記拡散板5には、アクリル系樹脂、フッ素樹脂など紫外線を透過できる材料のシートを用いることができ、シート内部を導波してきた光を、シート内部もしくは表面に散乱因子を設けることで任意の割合で散乱、漏光することができるようになっている。散乱因子としては、屈折率の異なる微粒子をシート内に添加したり、シート表面にサンドブラスターで凹凸を設けたりすることで散乱因子とすることができる。シート内を導波する光の進行方向に対して、散乱因子の濃度を漸次増加させることで、全体として均一な散乱、漏光を達成することができる。
The
拡散板5の一端側は、光触媒担持体4よりも延出し、一端部では拡散板5同士が積層され、その端面である入射口6は、鏡面研磨されている。
また、光触媒装置本体2に分解対象物質を含む流体を流す場合、この図1中「IN」と記したように、流体は拡散板5同士の隙間を通して光触媒装置本体2内に入り、光触媒担持体4のコルゲート板形状に沿って流れ、図1中「OUT」と記したように、光触媒装置本体2の他端側から出るようになっている。
One end side of the
Further, when a fluid containing a substance to be decomposed is caused to flow through the photocatalyst device
前記励起光源3としては、複数のLEDを並べたLEDアレイが用いられている。前述したように、LEDは長寿命であり、電気−光変換効率が高く、コンパクトである。また、出力や照度の高いLEDを用いることで、高い光触媒効果を得ることができる。
なお、本発明において、励起光源3としてはLEDに限定されず、ブラックライト、水銀灯などの他の光源を用いてもよい。
As the excitation light source 3, an LED array in which a plurality of LEDs are arranged is used. As described above, the LED has a long lifetime, high electro-optical conversion efficiency, and is compact. Moreover, a high photocatalytic effect can be acquired by using LED with high output and illumination intensity.
In the present invention, the excitation light source 3 is not limited to the LED, and other light sources such as a black light and a mercury lamp may be used.
本発明の励起光の照射方法では、前述したような光触媒装置1を用い、前記入射口6から高照度で入射した励起光を拡散板5から低照度で光触媒担持体4に照射させることを特徴としている。
In the excitation light irradiation method of the present invention, the
また本発明の光触媒による分解対象物分解方法は、前述したような光触媒装置1を用意し、前記励起光源3を点灯し、前記光触媒担持体4と拡散板5との間のスペースに分解対象物質を含む流体を流し、前記入射口6から高照度で入射した励起光を拡散板から低照度で光触媒担持体5に照射して光触媒機能を発現させ、分解対象物を分解することを特徴としている。
前記分解対象物としては、例えば、窒素酸化物(Nox)、アセトアルデヒドなどのアルデヒド類、酢酸などのカルボン酸類、含硫化合物や含窒素化合物などの悪臭成分、環境ホルモン、レジオネラ菌、などが挙げられる。
また、前記分解対象物質を含む流体としては、室内空気、エンジン排ガス、工場排煙、飲料水、生活排水、温泉、プールの水、工場排水、などが挙げられる。
In the method for decomposing an object to be decomposed by the photocatalyst of the present invention, the
Examples of the decomposition target include nitrogen oxides (Nox), aldehydes such as acetaldehyde, carboxylic acids such as acetic acid, malodorous components such as sulfur-containing compounds and nitrogen-containing compounds, environmental hormones, Legionella bacteria, and the like. .
Examples of the fluid containing the substance to be decomposed include indoor air, engine exhaust gas, factory smoke, drinking water, domestic wastewater, hot spring, pool water, and factory wastewater.
通常、分解対象となるガスおよび液中の分解対象物濃度は、比較的希薄であるため、分解対象物の拡散により分解速度が律速されている。その場合、高照度の光を用いて光触媒を励起しても、励起された電子、ホールが再結合する割合が高くなり、光量の一部もしくは大部分が無駄になっている。したがって、光量一定で励起光を照射するならば、高照度、小面積よりも低照度、大面積で光触媒機能を発現させた方が有利になると考えられる。 Usually, the gas to be decomposed and the concentration of the decomposition target in the liquid are relatively lean. Therefore, the decomposition rate is limited by the diffusion of the decomposition target. In that case, even if the photocatalyst is excited using light with high illuminance, the ratio of recombined excited electrons and holes is high, and a part or most of the light amount is wasted. Therefore, if the excitation light is irradiated with a constant amount of light, it is considered advantageous to develop the photocatalytic function with a large area and a low illuminance rather than a high illuminance and a small area.
これをモデル実験によって確認した。実験方法を説明すると、まず、市販の光触媒コーティング液を用いて光触媒コーティングを施したアルミ板を紫外線が透過するガラス製密閉容器に入れ、所定量のアセトアルデヒドガスを前記密閉容器内にシリンジで注入し、吸着平衡状態になるまで放置した。平衡状態での容器内のアセトアルデヒド濃度が10ppmになるよう注入量を調整した。次に、ガラス容器の外側からブラックライトを用いて紫外線を照射し、光触媒の分解作用によって容器内のアセトアルデヒド濃度が低下していく様子をガスクロマトグラフィーを用いて定量した。光量が一定になるように照度とアルミ板の面積を変えて比較実験を行った。照度は0.05〜0.5mW/cm2とし、光量は1.1mWになるよう、それぞれアルミ板の面積を変更した。 This was confirmed by model experiments. The experimental method will be explained. First, an aluminum plate coated with a photocatalyst using a commercially available photocatalyst coating solution is placed in a glass sealed container that transmits ultraviolet light, and a predetermined amount of acetaldehyde gas is injected into the sealed container with a syringe. The mixture was allowed to stand until adsorption equilibrium was reached. The injection amount was adjusted so that the concentration of acetaldehyde in the container in the equilibrium state was 10 ppm. Next, ultraviolet rays were irradiated from the outside of the glass container using black light, and the manner in which the acetaldehyde concentration in the container was lowered by the decomposition action of the photocatalyst was quantified using gas chromatography. A comparative experiment was performed by changing the illuminance and the area of the aluminum plate so that the amount of light was constant. The area of each aluminum plate was changed so that the illuminance was 0.05 to 0.5 mW / cm 2 and the amount of light was 1.1 mW.
比較の方法は、紫外線を照射してからの時間(min)をx、そのとき測定した容器内のアセトアルデヒド濃度(ppm)をyとし、y=a×exp(−b×x)の形にグラフィッティングを行った。ここで、a,bはそれぞれ定数である。bを分解速度係数と定義し、この分解速度係数の大小を比較することで、光触媒効果を比較した。実験の結果、横軸に照度の逆数、縦軸に分解速度係数をとったグラフを図2に示す。 In the comparison method, the time (min) after irradiation with ultraviolet rays is x, the acetaldehyde concentration (ppm) in the container measured at that time is y, and the graph is in the form of y = a × exp (−b × x). Fitting was performed. Here, a and b are constants. The photocatalytic effect was compared by defining b as a decomposition rate coefficient and comparing the magnitudes of the decomposition rate coefficients. As a result of the experiment, a graph in which the horizontal axis represents the reciprocal of illuminance and the vertical axis represents the decomposition rate coefficient is shown in FIG.
図2の結果より、通常の脱臭、浄化レベルと考えられる10ppm程度のアセトアルデヒド濃度では、光量一定で励起光を照射するならば、高照度、小面積よりも低照度、大面積で光触媒機能を発現させた方が有利になることがわかった。この効果は、脱臭、浄化速度が分解対象物の拡散濃度によって律速される条件では顕著になると考えられ、すなわち悪臭原因物質などの分解対象物の濃度が通常の室内、車内のように10ppmより低い条件でも有利であると予想される。モデル実験の結果、分解対象物が10ppm以下の気相分解では、0.3mW/cm2以下の照度において効率が良くなることがわかった。 From the results shown in FIG. 2, at an acetaldehyde concentration of about 10 ppm, which is considered to be a normal deodorization and purification level, if the excitation light is irradiated with a constant light amount, a photocatalytic function is manifested in a high illumination, a low illumination rather than a small area, and a large area. It was found that it would be advantageous to do so. This effect is considered to be conspicuous under conditions where the deodorization and purification rate is controlled by the diffusion concentration of the decomposition target, that is, the concentration of the decomposition target such as a malodor causing substance is lower than 10 ppm as in a normal room or car. Conditions are also expected to be advantageous. As a result of the model experiment, it was found that the efficiency is improved at the illuminance of 0.3 mW / cm 2 or less when the decomposition target is 10 ppm or less.
本発明の装置では、拡散板端の入射口にLEDで照射する際、入射口面内では均一照度であるとし、拡散面からの漏光照度も均一であるとすると、拡散板の入射口の面積に入射口面内の照度をかけて得られる値が、拡散面からの漏光照度に拡散面の面積をかけて得られる値にほぼ等しくなる。したがって、拡散板を構成するシートの厚さを薄くして面積を広くすれば任意の低照度化が可能になる。
光源の出射位置から光触媒担持体の受光位置までの距離を離し照度を下げるという方法では、装置全体が大きくなってしまうために好ましくない。
In the apparatus of the present invention, when irradiating the incident aperture at the end of the diffusion plate with the LED, assuming that the illumination intensity is uniform within the entrance aperture surface, and the light leakage illuminance from the diffusion surface is also uniform, the area of the entrance aperture of the diffusion plate The value obtained by multiplying the illuminance in the entrance surface by approximately the value obtained by multiplying the leakage light illuminance from the diffusion surface by the area of the diffusion surface. Therefore, if the thickness of the sheet constituting the diffusion plate is reduced to increase the area, it is possible to arbitrarily reduce the illuminance.
The method of decreasing the illuminance by separating the distance from the light source emission position to the light receiving position of the photocatalyst carrier is not preferable because the entire apparatus becomes large.
本発明に係る光触媒装置1は、脱臭装置、空気清浄装置、浄水器及び排水浄化装置などに利用することができる。本発明に係る脱臭装置、空気清浄装置、浄水器及び排水浄化装置は、前述した光触媒装置を備えたことによって、励起光を効率よく利用して高い光触媒効果を得ることができる。
The
[実施例1]
厚さ0.25mm、面積400cm2の紫外線を透過するアクリルシート表面に、図3に示すようにサンドブラストで凹凸を付けた。アクリルシート5の長さaは400mm、幅bは100mm、サンドブラスト処理部分7の長さcは300mmである。シートの一端から波長365nmの光を入射させ、アクリルシートの透過光とサンドブラスト処理部分からの散乱漏光を測定したところ、入射光量のうち、98%がアクリルシート表面(両面)から漏光していた。
[Example 1]
As shown in FIG. 3, the surface of the acrylic sheet having a thickness of 0.25 mm and an area of 400 cm 2 that transmits ultraviolet rays was roughened by sandblasting. The length a of the
面積300cm2のアルミ板100枚に市販の光触媒コーティング液で光触媒コーティングを施し、サンドブラスト処理をしたアクリルシート101枚と交互に重ねて積層した。アクリルシートは一端を口金で固定し、十分に鏡面研磨をして入射口とした。 Photocatalyst coating was performed on 100 aluminum plates having an area of 300 cm 2 with a commercially available photocatalyst coating liquid, and 101 sheets of acrylic sheets subjected to sandblasting were alternately stacked and laminated. One end of the acrylic sheet was fixed with a base, and was sufficiently mirror-polished to form an entrance.
光源には中心波長380nm、消費電力2.5WのLED5個を用い、入射口から距離5mmの位置に均等に固定した。この状態で照射を行うと、入射口面内では、平均照度は20.6mW/cm2であり、合計で520mWが照射される。これが面積300×101×2(両面)=60600cm2から均等に照射されるとすると、0.0086mW/cm2で光触媒担持体(アルミ板)に照射されることになる。 Five LEDs with a central wavelength of 380 nm and power consumption of 2.5 W were used as the light source, and they were evenly fixed at a distance of 5 mm from the entrance. When irradiation is performed in this state, the average illuminance is 20.6 mW / cm 2 within the entrance surface, and a total of 520 mW is irradiated. When this is evenly illuminated from an area 300 × 101 × 2 (both sides) = 60600cm 2, will be illuminated by 0.0086mW / cm 2 to photocatalyst carrier (aluminum plate).
この光触媒装置をステンレス鋼製の20Lの密閉容器に入れ、この容器を密閉した後、所定濃度、所定量のアセトアルデヒドガスを導入し、吸着平衡に達するまで放置して容器内部のアセトアルデヒド濃度をガスクロマトグラフィーで測定したところ、9.0ppmであった。
この後、LEDを点灯させ、光触媒効果によりアセトアルデヒド分解を行った。アセトアルデヒド濃度の経時変化を図4に示す。後述の比較例1と比べ、短時間でアセトアルデヒドを分解することができた。
This photocatalyst device is put in a 20 L stainless steel sealed container, and after sealing this container, a predetermined concentration and a predetermined amount of acetaldehyde gas is introduced and left until reaching the adsorption equilibrium, and the acetaldehyde concentration inside the container is measured by gas chromatography. It was 9.0 ppm as measured by chromatography.
Thereafter, the LED was turned on, and acetaldehyde was decomposed by the photocatalytic effect. The change with time of the acetaldehyde concentration is shown in FIG. Compared to Comparative Example 1 described later, acetaldehyde could be decomposed in a short time.
[比較例1]
面積300cm2のアルミ板1枚に市販の光触媒コーティング液で光触媒コーティングを施した。
光源には中心波長380nm、消費電力2.5WのLED5個を用い光触媒コーティングを施したアルミ板から距離100mmの位置に均等に固定した。この状態で照射を行うと、アルミ板表面では、平均照度が1.7mW/cm2となり、合計で520mWが照射される。
[Comparative Example 1]
A photocatalyst coating was applied to one aluminum plate having an area of 300 cm 2 with a commercially available photocatalyst coating solution.
Five LEDs with a central wavelength of 380 nm and power consumption of 2.5 W were used as the light source, and they were fixed uniformly at a distance of 100 mm from the aluminum plate coated with the photocatalyst. When irradiation is performed in this state, the average illuminance is 1.7 mW / cm 2 on the surface of the aluminum plate, and a total of 520 mW is irradiated.
この光触媒装置をステンレス鋼製の20Lの密閉容器に入れ、この容器を密閉した後、所定濃度、所定量のアセトアルデヒドガスを導入し、吸着平衡に達するまで放置して容器内部のアセトアルデヒド濃度をガスクロマトグラフィーで測定したところ、9.0ppmであった。
この後、LEDを点灯させ、光触媒効果によりアセトアルデヒド分解を行った。アセトアルデヒド濃度の経時変化を図4に示す。比較例1は実施例1に比べ、分解速度が遅かった。
This photocatalyst device is put in a 20 L stainless steel sealed container, and after sealing this container, a predetermined concentration and a predetermined amount of acetaldehyde gas is introduced and left until reaching the adsorption equilibrium, and the acetaldehyde concentration inside the container is measured by gas chromatography. It was 9.0 ppm as measured by chromatography.
Thereafter, the LED was turned on, and acetaldehyde was decomposed by the photocatalytic effect. The change with time of the acetaldehyde concentration is shown in FIG. Comparative Example 1 was slower in decomposition rate than Example 1.
1…光触媒装置、2…光触媒装置本体、3…励起光源、4…光触媒担持体、5…拡散板、6…入射口、7…サンドブラスト処理領域。
DESCRIPTION OF
Claims (12)
A wastewater purification apparatus comprising the photocatalyst apparatus according to claim 1.
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