Tungsten oxide photocatalyst modified with copper ion, and process for production thereof
US9061272B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2011 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Nov 13, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/802
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a copper ion-modified tungsten oxide photocatalyst subjected to chemical etching treatment with a basic aqueous solution in which a rate of change in diffuse reflectance of the photocatalyst as measured at a wavelength of 700 nm between before and after irradiated with an ultraviolet light in atmospheric air is less than 10%; and a process for producing a copper ion-modified tungsten oxide photocatalyst which includes a copper ion modifying step of modifying a tungsten oxide powder with a copper ion; a chemical etching step of subjecting the tungsten oxide powder to chemical etching treatment with a basic aqueous solution, the chemical etching treatment being carried out either before or after the copper ion modifying step; and a drying step of drying the product obtained after the above steps at a temperature of 200° C. or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.