摘要:
A photocatalyst comprises, on the surface, a zinc oxide film which comprises zinc oxide fine particles formed by anodic oxidation of zinc and having a particle size of not more than 0.2 .mu.m and a method for preparing a photocatalyst comprises the step of anodically oxidizing the surface of a zinc metal substance or a substance mainly comprising zinc metal to form, on the surface, a zinc oxide film which comprises zinc oxide fine particles having a particle size of not more than 0.2 .mu.m. The photocatalyst permits quite efficient decomposition or destruction of gases or bacterial cells to be treated, can easily be adhered to faces to which the photocatalytic function is to be imparted to thus impart sterilization and/or deodorization functions thereto and can easily be fitted to various apparatuses to which a film has conventionally been applied with great difficulty. In particular, if the thickness of the metal substrate is not more than 1 mm, the photocatalyst can be processed by, for instance, cutting and/or bending so that it can be adhered to faces other than flat ones. Moreover, if the photocatalytic activity thereof is deteriorated due to, for instance, contamination, the used photocatalyst can easily be replaced with a fresh one.
摘要:
The present invention is concerned with an organic-inorganic composite graded material containing a composite material formed by chemically bonding an organic polymer compound and a metallic compound and having a component graded structure in which the content of the metallic compound continuously changes in the depth direction from the material surface, a process for the production of the above organic-inorganic composite graded material by forming a coating layer composed of a specific coating solution for forming the organic-inorganic composite film on an organic substrate and drying the coating layer under heat, a coating agent composed of the above organic-inorganic composite graded material for forming a coating film, and an article coated with the above coating agent.
摘要:
A metal material having a photocatalytic activity which comprises an anodized layer and a thin layer containing titanium oxide powder which are heat treated are sequentially laminated on the surface of a substrate comprising metal material including titanium. By anodically oxidizing the metal material including titanium, an anodized layer is formed on the surface thereof. A thin layer containing titanium oxide powder is further coated on this surface, and heat treatment is carried out before and/or after forming this thin layer containing titanium oxide powder.
摘要:
A ZnO--Pd composite catalyst wherein Pd is dispersed and fixed on the surface of ZnO is produced by ion adsorption process having the steps of soaking ZnO in an acid solution of Pd to adsorb Pd ions (Pd.sup.2+) onto the surface of ZnO; and reducing the adsorbed Pd ions to metallic Pd particles so that the metallic Pd particles are substantially evenly deposited on the surface of ZnO. The ZnO--Pd composite catalyst provides a stable and continuing CO oxidizing capability, without light irradiation, even when the air to be treated contains sulfur compounds such as H.sub.2 S and SOx.
摘要:
A method for hydrophilifying the surface of a substrate by taking advantage of photocatalytic action. The substrate has a photocatalytic titania coating (10). The surface of the photocatalytic coating (10) bears the solid acid that increases a hydrogen bond component (.gamma..sub.S.sup.h) in the surface energy in the solid/gas interface of the coating. Photoexcitation of the photocatalyst enhances the hydrogen bond component (.gamma..sub.S.sup.h) in the surface energy of the photocatalytic coating (10), accelerating the physical adsorption of molecules of water in the atmosphere through a hydrogen bond (16) onto hydrogen atoms in a terminal OH group (12), bonded to a titanium atom, and a bridge OH group (14) on the surface of the coating. This results in the formation of a high density, physically adsorbed water layer (18) on the surface of the photocatalytic coating (10), thus permitting the surface of the substrate to be easily hydrophilified. The method is applicable to antifogging, antifouling, selfcleaning and cleaning of articles.
摘要:
A method for highly hydrophilifying the surface of an article by photoexcitation of a semiconductor photocatalyst and maintaining the hydrophilicity is disclosed. A layer containing a photocatalyst is formed on a substrate. Onto the surface of the layer are fixed a hydroxyl group upon photoexcitation of the photocatalyst and a physically adsorbed water molecule in the vicinity of the hydroxyl group upon photoexcitation of the photocatalyst. Thus, the surface is highly hydrophilified. Further, this surface, simultaneously with the hydrophilification, exhibits higher hydrophobicity.
摘要:
The present invention provides a new photocatalyst sheet in which the substrates coated with fluorocarbon resin are readily weldable mutually, and also of the high antifouling and water-repellant property by coating the outermost surface of film/fabric structure with fluorocarbon resin containing a photocatalyst and a photocatalyst sheet comprises a substrate (2), a first fluorocarbon resin layer (3) coated on said substrate (2), a second fluorocarbon resin layer (4) coated on said first fluorocarbon resin layer (3), and a third fluorocarbon resin layer (5) containing photocatalyst coated on said second fluorocarbon resin layer (4). The melting point of the first fluorocarbon resin layer (3) may be higher than the melting points of the second and the third fluorocarbon resin layers (4), (5).
摘要:
A method of preventing or reducing fogging of a surface of a composite when subjected to humid conditions includes providing a composite with a surface. The composite includes a substrate and a photocatalytic surface layer. The photocatalytic surface layer includes a photocatalyst. The method further includes subjecting the photocatalyst to photoexcitation to render the surface of the composite hydrophilic, wherein, after the photoexcitation, the surface of the composite has a water wettability of less than 10° in terms of the contact angle with water. The method further includes subjecting the composite to humidity that is sufficient to induce fogging of the substrate if the photocatalytic surface layer were absent.
摘要:
A process for photocatalytically treating a hospital room contaminated by bacteria or an interior environment bearing airborne malodorous substances. A thin film of photocatalyst made of a semiconductor such as titanium dioxide is disposed on the inner wall of the hospital room or living space. The photocatalytic thin film is irradiated by a light source suitable for general lighting applications, such as a fluorescent lamp, and is photoexcited by the small amount of ultraviolet radiation included in the light of the fluorescent lamp. The wattage of the fluorescent lamp as well as the distance between the photocatalytic thin film and the lamp are selected such that the intensity of those UV wavelengths which have a higher energy than the band gap energy of the photo-catalyst is 0.001-1 mW/cm.sup.2, preferably, 0.01-0.1 mW/cm.sup.2. The bacteria and chemical compounds deposited on the photoexcited thin film are photodecomposed.
摘要翻译:一种光催化处理被细菌污染的医院室或带有空气恶臭物质的室内环境的方法。 在医院室或生活空间的内壁上设置由诸如二氧化钛的半导体制成的光催化剂薄膜。 光催化薄膜由适用于一般照明应用的光源(例如荧光灯)照射,并且由包括在荧光灯的光中的少量紫外线照射而被光激发。 选择荧光灯的功率以及光催化薄膜和灯之间的距离,使得具有比光催化剂的带隙能量更高的能量的那些UV波长的强度为0.001-1mW / cm2,优选为0.01-0.1mW / cm 2。 沉积在光激发薄膜上的细菌和化学化合物被光分解。
摘要:
The invention provides a novel cyanochromium-complex-based magnetic material formed on an electrode, which is excellent in magnetic properties and of which magnetic properties are reversibly controllable, by impressing a reduction potential which electrochemically reduces Cr.sup.3+ into Cr.sup.2+ in a solution containing at least [Cr(CN).sub.6 ].sup.3- and Cr.sup.3+.