TITANIUM OXIDE PHOTOCATALYST AND METHOD FOR PRODUCING THE SAME
First Claim
1. A titanium oxide photocatalyst comprising at least an anatase-type titanium oxide and fluorine,wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, andwt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.
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Abstract
A titanium oxide photocatalyst that is capable of improving a decomposition rate, and a method for producing the same are provided. The titanium oxide photocatalyst of the present invention is a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and 90 wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.
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Citations
21 Claims
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1. A titanium oxide photocatalyst comprising at least an anatase-type titanium oxide and fluorine,
wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.
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7. A method for producing a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine comprising the steps of:
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mixing a fluorine compound and an aqueous dispersion solution of an anatase-type titanium oxide that absorbs n-butylamine in an amount of 8 μ
mol/g or less, and when a pH of the mixed solution exceeds 3, adjusting the pH at 3 or less with an acid, whereby the titanium oxide and the fluorine compound are caused to react with each other in the mixed solution; andwashing a reaction product obtained by the reaction, whereby a titanium oxide photocatalyst is obtained that contains at least the anatase-type titanium oxide and the fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and, of an entirety of the fluorine, a proportion of fluorine chemically bonded to the anatase-type titanium oxide is 90 wt % or more. - View Dependent Claims (8, 11, 19)
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9. A method for producing a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine comprising the steps of:
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adjusting a pH of an aqueous dispersion solution of a titanium oxide with an alkaline solution until the pH thereof becomes in a range of 7.5 to 9.5, and thereafter filtering the solution; re-dispersing a filtration residue obtained by the filtration into water; obtaining a suspension by adding a fluorine compound to the re-dispersion solution obtained by the re-dispersion, and thereafter adjusting a pH of the suspension with an acid until the pH thereof becomes 3 or less, hereby the titanium oxide and the fluorine compound are cased to react with the other; and washing a reaction product obtained by the reaction, whereby a titanium oxide photocatalyst is obtained that contains at least the anatase-type titanium oxide and the fluorine, wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and, of an entirety of the fluorine, a proportion of the fluorine chemically bonded to the anatase-type titanium oxide is 90 wt % or more. - View Dependent Claims (10, 20, 21)
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Specification