Titanate / titania composite nanoparticle
AssigneeNanyang Technological University
InventorsYu Hua Cheng, Zhong Chen
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Abstract
The present invention relates to a photocatalytically active nanoparticulate material. A nanoparticle of the invention is a composite nanoparticle having two crystalline phases: hydrogen titanate and titania, which are uniformly mixed in the nanoparticle. The invention also relates to forming a nanoparticulate composite material by heating a basic titania sol under solvothermal conditions.
Claims25
A composite nanoparticle having a composition comprising a phase of each of protonated titanate and titania (titanium dioxide), wherein the phases of protonated titanate and titania in the composition are uniformly mixed and are mutually inter-dispersed such that there are no morphologically distinct portions, and wherein the nanoparticle comprises 35 to 75 percent protonated titanate and 65 to 25 percent titania and wherein the composition is dried.
A method of manufacturing a composite protonated titanate/titania nanoparticle, wherein phases of protonated titanate and titania are uniformly mixed and are mutually inter-dispersed such that there are no morphologically distinct portions, and wherein the nanoparticle comprises 35 to 75 percent protonated titanate and 65 to 25 percent titania, the method comprising:
- (i) forming under basic conditions a sol, the sol containing an oxide of a single metal, wherein the metal oxide is titanium oxide, wherein forming the titania sol comprises contacting a titanium precursor and a base in a suitable polar solvent, wherein the titanium precursor and the base are used in a molar ratio from about 10:1 to about 1:10, and (ii) heating the sol under solvothermal conditions, wherein the sol is heated at a temperature within the range between about 100° C. and about 165° C. for a period of about 1 to about 3 hours and drying the obtained composition.
Dependencies are inferred from the claim text.