Transparent, stable titanium dioxide sols

A technology of titanium dioxide and hydrated titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, metal/metal oxide/metal hydroxide catalyst, etc.

Active Publication Date: 2010-09-08
TRONOX LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Despite these advances in the art, there is still considerable room for improvement, as none of the known sols is free from disadvantages.

Method used

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  • Transparent, stable titanium dioxide sols
  • Transparent, stable titanium dioxide sols

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[0017] The preparation method of the stable and transparent colloidal photocatalytic titanium dioxide sol according to the present invention generally includes: (1) providing a solution containing a titanium compound; (2) precipitating amorphous hydrated titanium dioxide from the solution; (3) depositing the precipitate Titanium dioxide dispersed in water and mixed with a peptizer at a temperature between about 70°C and about 150°C for a time between about 3 hours and about 3 days; wherein the peptizer comprises an alpha-hydroxy carboxylic acid; A stable and transparent sol of titanium dioxide nanoparticles of titanite having a particle size of less than or equal to about 10 nanometers (nm) in diameter, preferably less than or equal to about 5 nm in diameter.

[0018] The titanium-containing compound may be any compound capable of forming a titanium dioxide precipitate, including but not limited to titanium alkoxide, titanium oxychloride, titanyl sulfate, titanyl acetylacetonat...

Embodiment 1

[0030] A transparent titania sol according to the present invention is prepared as follows. 50 g titanium isopropoxide (Alfa Aesar, 95%) diluted with 50 g isopropanol was slowly added to 250 g deionized water with vigorous stirring. Stirring was continued for about 10 more minutes after the titanium dioxide had precipitated. The precipitate was then filtered and washed with 500 g of deionized water. The washed wet cake was redispersed in deionized water to a total dispersion weight of 250 g. To this dispersion was added 6 g of lactic acid (Alfa Aesar, 85% in water) and mixed well. The dispersion was charged into a cylinder-type hydrothermal reactor (capacity 125 ml, Parr Instruments) lined with a Teflon cup and lid. The cylinder was then placed in a roller furnace with a rolling speed of 25 RPM and a temperature set at 80°C. The treatment was carried out for 24 hours. After cooling the sol to room temperature, its pH was 2.3. To this sol was added t-butylamine (Alfa Aesa...

Embodiment 2

[0034] A transparent titanium dioxide sol according to the present invention was prepared using the same procedure as in Example 1, except that 4.5 g of tartaric acid (Alfa Aesar, 99%) was used instead of lactic acid as the peptizer. The obtained sol is stable and transparent. TEM detection shows that it contains ≤5nm TiO 2 nanoparticles. High-resolution TEM d-spacing measurements indicated that the majority of the grains were anatase (>50%), with unknown secondary phases (<50%) showing unusually large d-spacings of ~0.6 nm.

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Abstract

A method of preparing stable, transparent photocatalytic titanium dioxide sols is disclosed which involves thermal treatment of a suspension of amorphous titanium dioxide in the presence of certain alpha-hydroxy acids. The sols comprise titanium dioxide particles in the anatase form having a crystallite size less than about 10 nm and exhibit excellent stability and transparency at basic, neutral,and acid pH.

Description

technical field [0001] The present invention generally relates to compositions for providing photocatalytic coatings on surfaces. More specifically, the present invention relates to sols of titanium dioxide nanoparticles that can be used to provide stain-releasable and / or self-cleaning transparent photocatalytic coatings on substrates. Background of the invention [0002] The photocatalytic properties of the semiconductor material titanium dioxide originate from the transition of electrons from the valence band to the conduction band under the influence of ultraviolet (UV) and near-UV. The generated active electron-hole pairs migrate to the surface of the titanium dioxide particles, where the holes oxidize the absorbed water to generate active hydroxyl radicals and the electrons reduce the absorbed oxygen to generate superoxide radicals, both of which Can degrade NO in the air x and volatile organic compounds (VOCs). In view of these properties, photocatalytic titanium di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00
CPCC04B41/65B01J37/0219C03C2218/113C04B41/009B01J35/004B01J35/0013C03C1/008C03C17/02C03C2203/32Y10S516/922C04B2111/00827B01J37/031B01J21/063C04B41/5041C01G23/053C01P2004/64C01P2006/22C04B41/4537C04B41/4549C04B28/02
Inventor G·付B·M·蒙克R·麦金泰尔
Owner TRONOX LLC
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