Showa Co.

Other

Mori Kosan Co., Ltd.

Taisei Corporation

Kinji Onoda

Teruki Takayasu

Teruo Arai

Shingo Mori

Susumu Yoshikawa

Takashi Nishiyama

Hiromasa Ogawa

Ryosuke Matsuoka

Asuko Kimoto

Yuko Tanaka

Masatada Makino

A material that is useful as a wear-resistant member, a highly functional photocatalytic material, a photoelectric conversion element material, etc., is produced without the need for complicated processes or complicated handling, which are problems of the prior art. Provided is a method for producing a surface-treated metallic titanium material or titanium alloy material, the method comprising the steps of (1) forming titanium nitride on the surface of a metallic titanium material, and (2) heating the metallic titanium material with titanium nitride formed on the surface thereof obtained in step (1) in an oxidizing atmosphere. Also provided is a method for producing a surface-treated metallic titanium material or titanium alloy material, the method comprising, between steps (1) and (2) above, the step of anodizing the metallic titanium material with titanium nitride formed on the surface thereof obtained in step (1) in an electrolyte solution that does not have an etching effect on titanium, thereby forming a titanium oxide film. Further provided is a surface-treated material.

Method for producing surface-treated metal titanium material or titanium alloy material, and surface-treated material

The present invention provides a novel method for treating soil-contaminated water, the method using a photocatalytic material capable of efficiently removing, by light irradiation alone, volatile organic compounds and heavy metals that give rise to soil contamination. The present invention provides a method for treating soil-contaminated water that detoxifies volatile organic compounds contained in soil-contaminated water using a photocatalytic material, the method being characterized by including the steps of (1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a gas phase, and (2) decomposing the volatile organic compounds contained in the gas phase obtained in step (1) using the photocatalytic material. The present invention further provides a method for treating soil-contaminated water using a photocatalytic material to remove heavy metals contained in the soil-contaminated water, the method being characterized, by including the steps of (1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a liquid phase, and (2) removing the heavy metals contained in the liquid phase obtained in step (1) using the photocatalytic material.

Method for treating soil-contaminating water using photocatalytic material

The invention concerns a method for producing a crystalline titanium oxide film useful as a photocatalyst, a photovoltaic element, etc. The crystalline titanium oxide film is produced by steps (a-1) and (b): (a-1) a step of heating titanium or titanium alloy under conditions (1) or (2) to form titanium nitride on the surface of the titanium or titanium alloy; (1) in an atmosphere of nitrogen and/or ammonia gas in the presence of a carbon material acting as an oxygen trapping agent; or (2) in an atmosphere where a pressure is reduced to discharge atmospheric gas, and then nitrogen and/or ammonia gas are/is introduced in the presence of a carbon material acting as an oxygen trapping agent; and (b) a step of immersing the titanium or titanium alloy obtained in step (a-1) above in an electrolyte containing an inorganic acid and/or organic acid, and applying voltage for anodization.

Process for producing crystalline titanium oxide coating film through electrolytic anodizing

The present invention provides a new method for decomposing and/or removing hazardous substances using a photocatalytic material. The method of the present invention is sufficiently useful in fields requiring quick decomposition and/or removal of hazardous substances in gas and/or liquid phases. The decomposition method of the present invention using a photocatalytic material enables significantly efficient and rapid decomposition of hazardous substances in gas and/or liquid phases by causing a photocatalytic material to coexist with a dilute hydrogen peroxide solution.

Decomposition/elimination method using a photocatalytic material

The lining structure of the present invention comprises lining plates each having supporting portions formed at two opposite sides of a square lining plate body via bent step portions, and covering portions formed at the remaining sides of the lining plate body; the lining plates being arranged in longitudinal and transverse directions on a surface to be lined; in the first and second lining plates that are adjacent to each other in longitudinal and transverse directions, a covering portion of one of the lining plates being superposed on a supporting portion of, and being butted against the lining plate body of, another of the lining plates, with the butted portion being joined by welding, with an adhesive, or a combination thereof.

Lining structure

The invention provides a titanium composite material comprising a bonded laminate having a layer of macromolecular material bonded to the modified surface of a titanium sheet or a titanium alloy sheet, and a process for preparing a titanium composite material, the process comprising the step of bonding a macromolecular material to a titanium sheet or a titanium alloy sheet having a modified surface to be bonded.

Growing community of inventors

Ikoma, Japan

Kinji Onoda