Titanium-containing materials

Inactive Publication Date: 2003-09-11
IND RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0226] FIG. 6 shows the effect of humidity on the photoactivity using two coa

Problems solved by technology

Building surfaces like windows and tiles, automobile screens and mirrors, etc. may attract all sorts of contaminants such as oil deposits, smoke and dust.
Windows, mirrors and other surfaces are fogged when cold due to the condensation of moisture droplets.
Many VOCs such as formaldehyde, toluene trichloroethylene (TCE), ethylene, etc. a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0308] Preparation of Titania Sol Using Titanium Tetraisopropoxide (TTIP) and UV Light

[0309] 14.2 g of TTIP was added to 3.15 g of oxalic acid dihydrate solution in 20 ml absolute ethanol. The mixture was stirred for 10 minutes then solvent was evaporated under vacuum. Water was added to the white solid and the mixture was stirred at 75.degree. C. to peptize it into a clear sol. The solution then was irradiated by a UV light using a mercury lamp for 3 hours. During that the amount of oxalic acid dropped to half its original concentration as determined by permanganate titration.

example 2

[0310] Preparation of Titania Sol Using in situ .alpha.-Titanic Acid and 0.5 Mole Ratio of Oxalic Acid

[0311] .alpha.-Titanic acid was obtained by hydrolysing 14.2 g TTIP in 100 ml water. 3.15 g of oxalic acid dihydrate was added and the mixture was stirred at 70.degree. C. to form a colourless sol.

example 3

[0312] Preparation of Titania Sol Using .alpha.-Titanic Acid Prepared from TTIP and 0.5 Mole Ratio of Oxalic Acid

[0313] 14.2 g of TTIP was added to oxalic acid solution in water (150 ml). The mixture was stirred at 70.degree. C. to form the sol as described in Example 2.

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Abstract

The invention relates to a method of preparing a solution containing colloidal particles which contain crystalline titanium dioxide wherein one or more hydrolysable titanium-containing compound(s) is stabilised by oxalic acid in a reaction medium. The reaction further relates to the preparation of titania materials (including particulate materials, coating solutions and films) which comprise or include anatase phase titania, and so are suitable in photocatalytic applications. The invention also deals with a method of preparing B-phase titania.

Description

[0001] This invention relates to processes for preparing titanium-containing materials. More particularly, it relates to processes of preparing solutions containing colloidal particles containing titanium ions, and to processes for preparing titanium dioxide containing materials from such solutions. This invention also relates to application of these titanium-containing materials.[0002] Titanium-containing composite materials have a range of applications. These include applications that depend on the ability of these materials to function as photocatalysts, constituents of film electrodes, hydrophilic surfaces, and to prevent the growth of micro-organisms.[0003] Photocatalysts[0004] Photocatalysis using titania and titania-based materials have been widely described in recent years for water treatment and air purification (Hoffmann, Martin, Choi and Bahnemann, Chem. Rev. 1995, 95, 69). Anatase was reported to be the most active phase of TiO.sub.2 with a band gap of 3.2 eV (387 nm). T...

Claims

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Application Information

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IPC IPC(8): C01G23/00B01J21/06B01J23/42B01J23/50B01J35/00C01G23/053C03C17/25C04B35/46C04B35/624
CPCB01J21/063C04B2235/549B01J23/50B01J35/004B82Y30/00C01G23/053C01P2002/72C01P2002/82C01P2002/88C01P2004/03C01P2004/84C01P2006/12C03C17/256C03C2204/02C03C2217/212C03C2217/213C03C2217/23C03C2217/71C04B35/46C04B35/624C04B2235/3231C04B2235/3232C04B2235/3281C04B2235/3418C04B2235/5454B01J23/42
Inventor AL-SALIM, NAJEH IBRAHIMKEMMITT, TIMOTHY
Owner IND RES LTD
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