Iron doped titanium dioxide nanocrystals and their use as photocatalysts
AssigneeRh-Imaging Systems Inc.
InventorRodney HERRING
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Abstract
A method of making a visible light photo-catalyst is provided, the method comprising doping a titanium dioxide nanocrystal with iron to provide an iron-doped nanocrystal, washing the iron-doped nanocrystal with an acid to produce an acid-washed iron-doped titanium dioxide nanocrystal and rinsing the acid-washed iron-doped titanium dioxide nanocrystal to remove a residual of the acid, thereby providing a visible light photo-catalyst. The photo-catalyst is also provided, as are methods of using the photo-catalyst in remediation.
Claims28
A method of synthesizing a visible light photo-catalyst, the method comprising doping a titanium dioxide nanocrystal with iron to provide an iron-doped titanium dioxide nanocrystal, drying the iron-doped titanium dioxide nanocrystal to provide a dried iron-doped titanium dioxide nanocrystal, washing the dried iron-doped titanium dioxide nanocrystal with an acid having a pH of no higher than about 4 to produce an acid-washed iron-doped titanium dioxide nanocrystal and rinsing the acid-washed iron-doped titanium dioxide nanocrystal to remove a residual of the acid, thereby providing the visible light photo-catalyst.
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A method of remediating an aqueous solution, the aqueous solution including one or more of at least one organic compound, ammonia, organic matter, microbial contamination or at least one organometallic compound, the method comprising:
- exposing the aqueous solution to a photo-catalyst, the photo-catalyst comprising substantially iron oxide free, iron doped titanium dioxide;
- and exposing the photo-catalyst to light, thereby remediating the aqueous solution and producing an at least one remediation product.
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A combination for use in remediation of aqueous solutions, the combination comprising:
- a visible light photo-catalyst, the photo-catalyst comprising acid washed iron-doped titanium dioxide which has a reduced content of iron oxide;
- and a substrate, the photo-catalyst attached to the substrate.
Dependencies are inferred from the claim text.