[go: up one dir, main page]

WO2007094189A1 - dispositif anti-encrassement de type photocatalytique - Google Patents

dispositif anti-encrassement de type photocatalytique Download PDF

Info

Publication number
WO2007094189A1
WO2007094189A1 PCT/JP2007/051937 JP2007051937W WO2007094189A1 WO 2007094189 A1 WO2007094189 A1 WO 2007094189A1 JP 2007051937 W JP2007051937 W JP 2007051937W WO 2007094189 A1 WO2007094189 A1 WO 2007094189A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive member
antifouling
water
algae
photocatalytic
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.)
Ceased
Application number
PCT/JP2007/051937
Other languages
English (en)
Japanese (ja)
Inventor
Tadashi Ogasawara
Shinji Shimosaki
Kazuomi Azuma
Toshiaki Matsuo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osaka Titanium Technologies Co Ltd
Original Assignee
Osaka Titanium Technologies Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osaka Titanium Technologies Co Ltd filed Critical Osaka Titanium Technologies Co Ltd
Publication of WO2007094189A1 publication Critical patent/WO2007094189A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts

Definitions

  • the present invention relates to a photocatalytic antifouling device effective for preventing generation of algae under an underwater light receiving environment such as a cooling tower, a purification water tank, and a filter of an air conditioner.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-249148
  • a photocatalyst When a photocatalyst is used for preventing algae, a photocatalyst such as titanium oxide is usually coated on the surface of the object to be prevented from contact with water and receiving light.
  • the mechanism of anti-algae by photocatalyst is considered as follows. That is, it is considered that the oxidative power of the photocatalyst causes inactivation of adherent cells and decomposition of adhesive substances, resulting in weakened algal adherence and an excellent antialgae function.
  • An object of the present invention is to provide a photocatalytic antifouling device capable of effectively preventing the generation of various types of dirt in an underwater light receiving environment including the generation of algae.
  • a photocatalyst when the generation of algae on the surface of a metal material that is immersed in water and receives light is prevented by a photocatalyst, the surface of the metal material is coated with a photocatalyst, usually a TiO film. Coat photocatalyst
  • the generation of algae can be suppressed compared to the case without coating, but it is only possible to extend the period until the generation of algae, and it is difficult to completely prevent the generation. .
  • the counter electrode which is electrically connected to the metal material by an external circuit, is immersed in water together with the metal material, and both are made to conduct through the water, the generation of algae can be completely prevented even in the same operating environment. Or even if it cannot be completely prevented, the period until the algae emerges can be greatly extended.
  • the photocatalytic antifouling device of the present invention has been completed on the basis of strong knowledge, and has a photocatalytic layer on the antifouling target surface that comes into contact with water and receives light.
  • a first conductive member, and a second conductive member as a counter electrode that is in contact with the water and electrically connected to the first conductive member through an external circuit. This significantly increases the antifouling effect of the photocatalyst layer.
  • the antifouling object 2 that is immersed in water 1 and receives light on the surface is used as the first conductive member.
  • a photocatalytic layer 3 is provided on the surface that is the surface to be antifouled.
  • the second conductive member as the counter electrode 5 is combined with the conductive antifouling object 2.
  • the counter electrode 5 is immersed in the water 1 together with the antifouling object 2, and is electrically connected to the antifouling object 2 via the external circuit 4 while being electrically connected to the antifouling object 2.
  • Fig. 1 (b) if the external circuit 4 is provided with a power source 9 that conducts current from the counter electrode 5 to the antifouling target 2, the antifouling effect by the photocatalytic layer 3 is further enhanced. Is done.
  • the reason why the antifouling effect by the photocatalyst layer 3 is enhanced in the photocatalytic antifouling device of the present invention is considered as follows.
  • the counter electrode 5 does not exist, that is, when only the photocatalyst layer 3 is present, the anode and the cathode are mixed in various parts of the material of the photocatalyst layer 3, but by combining the counter electrode 5, the cathode and the anode are separated, and the positive cathode current (anode Side current and cathode side current) are equal. A current flows at a potential.
  • the electrode potential can be easily controlled by changing the electrode surface area ratio, mass transfer by stirring, etc., and the antifouling effect can be enhanced by generating a current corresponding to the potential. If this power is added to the state force, the electrode potential can be forcibly changed, and the antifouling effect can be further improved by increasing the cathode current due to the potential difference.
  • the material of the second conductive member constituting the counter electrode 5 carbon, copper, various steels, and the like can be used. In the case of carbon, the point that the amount of current is large and the antifouling effect is high is particularly preferable. .
  • the form of the second conductive member is not particularly limited. Further, the material and form of the first conductive member constituting the antifouling object are not particularly limited.
  • the conductive plate material may be a coating film, fiber, porous body or the like. In the case of fibers and porous bodies, a photocatalyst layer can be provided not only on the exposed surface but also on the inside.
  • the light applied to the photocatalyst layer may be illumination light or sunlight, and the type thereof is not particularly limited. Photocatalysts react not only with visible light but also with ultraviolet light, and sunlight containing ultraviolet light has a wider effective band and is advantageous.
  • the photocatalytic antifouling device of the present invention is a conductive antifouling object having an antifouling object having a photocatalyst layer on the surface that is in contact with water as the antifouling object surface.
  • Combining a counter electrode that comes into contact with water with an object and is electrically connected to the antifouling target object via an external circuit significantly increases the antifouling effect including anti-algae by photocatalyst. It has a great industrial effect, such as maintaining long-term functions in air conditioner cooling towers, water purification tanks, filters, etc., and reducing maintenance costs.
  • the countermeasures are simple, and this point power is also economical. Furthermore, since the effect can be obtained without a power source, it is excellent in economic efficiency, and if a separate power source is used, the antifouling effect can be further enhanced.
  • FIG. 2 is a schematic configuration diagram of the antifouling apparatus showing the first embodiment of the present invention.
  • the antifouling device of this embodiment is an anti-algae device on the inner surface of a water storage tank 8 for storing outdoor water 1 such as a pool. Have been used.
  • a thin conductive layer is formed as the first conductive member 2 on the inner surface of the water storage tank 8 which is a surface to be antifouled by applying a conductive paint or the like, and further on the surface of the first conductive member 2.
  • the photocatalytic layer 3 is formed as a coating.
  • a second conductive member 5 as a counter electrode is immersed in the water 1 in the water storage tank 8.
  • the second conductive member 5 is made of carbon such as graphite or charcoal, and is electrically connected to the first conductive member 2 via an external circuit 4 outside the water.
  • the water 1 in the water storage tank 8 contains an electrolyte and exhibits conductivity.
  • sunlight hits the inner surface of the water storage tank 8 that is in contact with the water 1 in the water tank 1 and is the target of antifouling, the light is emitted by the first conductive member 2 and the second conductive member 5 that have the photocatalytic layer 3 on the surface.
  • An electrochemical cell is formed, and current flows from the second conductive member 5 to the first conductive member 2 through the external circuit 4.
  • the electron transfer through the external circuit 4 enhances the algae-proofing effect on the bottom surface of the water storage tank by the photocatalyst layer 3.
  • FIG. 3 is a schematic configuration diagram of an antifouling apparatus showing a second embodiment of the present invention.
  • the antifouling device of this embodiment is used as an algae-proof device on the inner surface of a transparent aquarium 6 such as a fish breeding aquarium.
  • a transparent electrode film having a force such as ITO is covered on the inner surface of the transparent water tank 6 as a first conductive member 2, and a photocatalyst layer 3 made of TiO is further formed on the surface.
  • a second conductive member 5 as a counter electrode is immersed in the water 1 in the transparent water tank 6.
  • the second conductive member 5 is made of carbon such as graphite or charcoal, and is electrically connected to the first conductive member 2 via an external circuit 4 outside the water.
  • Water 1 in the transparent water tank 6 contains an electrolyte and exhibits conductivity.
  • the water 1 comes into contact with the photocatalytic layer 3 coated on the inner surface of the transparent water tank 6. Since the transparent water tank 6 is transparent, the photocatalyst layer 3 coated on the inner surface of the transparent water tank 6 is exposed to sunlight or illumination light from the outside through the tank wall. Further, the inner force of the photocatalyst layer 3 is also exposed to sunlight or illumination light through the opening of the transparent water tank 6.
  • the first conductive member 2 having the photocatalyst layer 3 on the surface and the second conductive member 5 form a photocatalytic battery, and the current flows from the second conductive member 5 to the first conductive member 2 through the external circuit 4. Flows.
  • FIG. 4 is a schematic configuration diagram of an antifouling apparatus showing a third embodiment of the present invention.
  • the antifouling device of the present embodiment assumes an anti-algae device in a cooling tower of an air conditioner.
  • the first conductive member 2 which is a metal material, is erected in the outdoor water storage tank 8, and the water 1 in the water storage tank 8 is pumped up by the pump 7 to be protected against algae. It is supplied to the surface of the first conductive member 2 which is a surface and flows down along the surface. A photocatalytic layer 3 made of TiO is coated on the surface of the first conductive member 2. Meanwhile, water storage
  • a second conductive member 5 as a counter electrode is immersed in the water 1 in the tank 8.
  • the second conductive member 5 is made of carbon such as graphite or charcoal, and is electrically connected to the first conductive member 2 via the external circuit 4. Further, the surface is electrically connected to the second conductive member 5 in the water 1 through the water flowing down along the surface of the first conductive member 2.
  • Example 1 the surface of a stainless steel plate was covered with a photocatalyst layer, and a counter electrode electrically connected to the stainless steel plate with an external circuit was immersed in industrial water in a water tank.
  • a counter electrode a carbon plate having a plate thickness of 8 mm and an immersion part size of 40 mm ⁇ 110 mm was used. In this case, the entire surface was covered with algae 50 days after the start of the experiment.
  • Example 2 a silicon solar cell was interposed in the external circuit in Example 1.
  • Example 3 the stainless steel plate in Example 1 was changed to an A4 size titanium plate. In this case, the entire surface was not covered with algae until 71 days after the start of the experiment.
  • FIG. 1 is a principle diagram of an antifouling device of the present invention.
  • FIG. 2 is a schematic configuration diagram of an antifouling apparatus showing a first embodiment of the present invention.
  • FIG. 3 is a schematic configuration diagram of an antifouling apparatus showing a second embodiment of the present invention.
  • FIG. 4 is a schematic configuration diagram of an antifouling apparatus showing a third embodiment of the present invention.

Landscapes

  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

L'invention permet d'empêcher la formation d'algues dans un environnement sous-marin recevant de la lumière dans une tour de refroidissement, un réservoir d'épuration d'eau, un filtre, et similaire, d'un climatiseur. Pour atteindre cet objectif, un objet anti-encrassement (2) immergé dans l'eau (1) et recevant de la lumière en surface sert de premier élément conducteur. Une couche photocatalytique (3) est disposée à la surface, à savoir la surface de l'objet anti-encrassement. Un second élément conducteur connecté électriquement à l'objet anti-encrassement conducteur (2) à travers un circuit externe (4) est combiné comme pôle opposé (5) et placé dans l'eau (1). L'effet de prévention des algues par la couche photocatalytique (3) est renforcé par l'absence d'alimentation grâce à l'utilisation du pôle opposé (5).
PCT/JP2007/051937 2006-02-13 2007-02-05 dispositif anti-encrassement de type photocatalytique Ceased WO2007094189A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-035410 2006-02-13
JP2006035410A JP2007209954A (ja) 2006-02-13 2006-02-13 光触媒式防汚装置

Publications (1)

Publication Number Publication Date
WO2007094189A1 true WO2007094189A1 (fr) 2007-08-23

Family

ID=38371375

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/051937 Ceased WO2007094189A1 (fr) 2006-02-13 2007-02-05 dispositif anti-encrassement de type photocatalytique

Country Status (2)

Country Link
JP (1) JP2007209954A (fr)
WO (1) WO2007094189A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100927185B1 (ko) * 2007-11-07 2009-11-18 재단법인서울대학교산학협력재단 태양 전지의 기전력을 이용한 광촉매 유기 오염물질 분해방법 및 이를 이용한 오염물질 분해 시스템.
JP5341715B2 (ja) * 2009-11-09 2013-11-13 株式会社クラレ イオン吸着装置及びイオン性物質の除去方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08229549A (ja) * 1995-02-27 1996-09-10 Nippon Shokubai Co Ltd 導水路への生物付着防止方法
JPH11128750A (ja) * 1997-10-30 1999-05-18 Hitachi Ltd 光触媒効果促進システム
JP2000317312A (ja) * 1999-05-06 2000-11-21 Tohoku Ricoh Co Ltd 光触媒反応方法、情報記録方法及び光触媒反応を利用したフィルタ等の部材
JP2003236551A (ja) * 2002-02-20 2003-08-26 Kurita Water Ind Ltd 有機ハロゲン化合物の分解方法、及び分解装置。
JP2003275598A (ja) * 2002-03-25 2003-09-30 Central Res Inst Of Electric Power Ind 光触媒装置および光触媒の照射方法
JP2003285069A (ja) * 2002-03-28 2003-10-07 Hitachi Metals Ltd 流体浄化装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08229549A (ja) * 1995-02-27 1996-09-10 Nippon Shokubai Co Ltd 導水路への生物付着防止方法
JPH11128750A (ja) * 1997-10-30 1999-05-18 Hitachi Ltd 光触媒効果促進システム
JP2000317312A (ja) * 1999-05-06 2000-11-21 Tohoku Ricoh Co Ltd 光触媒反応方法、情報記録方法及び光触媒反応を利用したフィルタ等の部材
JP2003236551A (ja) * 2002-02-20 2003-08-26 Kurita Water Ind Ltd 有機ハロゲン化合物の分解方法、及び分解装置。
JP2003275598A (ja) * 2002-03-25 2003-09-30 Central Res Inst Of Electric Power Ind 光触媒装置および光触媒の照射方法
JP2003285069A (ja) * 2002-03-28 2003-10-07 Hitachi Metals Ltd 流体浄化装置

Also Published As

Publication number Publication date
JP2007209954A (ja) 2007-08-23

Similar Documents

Publication Publication Date Title
JP6651560B2 (ja) 塩水から採取されるエネルギを用いた防汚システム
Huo et al. Low-voltage alternating current powered polydopamine-protected copper phosphide nanowire for electroporation-disinfection in water
JPH09510143A (ja) ヒドロキシル遊離基を発生しそして水中に溶解した化学物質を酸化する電気化学的方法および装置
KR100389446B1 (ko) 방오장치를 구비한 열교환기기
Wake et al. Development of an electrochemical antifouling system for seawater cooling pipelines of power plants using titanium
WO1999043618A1 (fr) Dispositif antisalissure electrochimique comprenant une structure sous-marine et procede de fabrication de la structure sous-marine utilisee pour ce dispositif
JP2020507026A (ja) 保護表面を防汚する装置
CN1056537A (zh) 防止海水、微咸水和/或淡水中的结构结污和/或腐蚀的方法和装置
WO2007094189A1 (fr) dispositif anti-encrassement de type photocatalytique
JP2002167725A (ja) 海水に接する構造物および熱交換器の防汚装置
CN109502687A (zh) 用于连续降解河道有机污染物的光催化水处理装置
US20140331912A1 (en) Apparatus using an electro-catalytic coating to reduce ship's friction and prevent biofouling
JPH10249357A (ja) 防汚方法
SK482012U1 (sk) Process for blue-greens disposal in standing waters and a device for performing thereof
JP2004176088A (ja) プレート型熱交換器およびその防汚装置
CN106222692B (zh) 基于平台钢桩环式电解防污电极的防污装置及其实现方法
JP4059457B2 (ja) 熱交換器および海水導水管の防汚・防食装置
Yahaya et al. Advancements in Anode Materials for Cathodic Protection: Nanostructured Alloys, Surface Modifications, and Smart Monitoring
JPH11244861A (ja) 水中構造物の防汚装置および生物の電気化学的な制御方法
JP2007186933A (ja) 海水に接する構造物の防汚防食装置および防汚防食方法
JP2000008338A (ja) 水中構造物の防汚装置
Harfst Non-Chemical Water Treatment.
ES2698532T3 (es) Electrodo para celdas electroquímicas y composición de las mismas
JP2007309052A (ja) 構造物の防汚装置および防汚方法
CN217972690U (zh) 铁炭微电解反应器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07708055

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)