Low temperature preparing process for anatase phase nano crystal titanium dioxide of light catalystic activity

A technology of photocatalytic activity and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high local concentration of materials, large investment, long reaction time, etc., and achieve strong surface adsorption capacity, high photocatalytic activity, and method simple effect

Inactive Publication Date: 2004-04-28
INST OF CHEM CHINESE ACAD OF SCI
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid phase precipitation method is easy to cause the local concentration of the material to be too high and the particle shape is uneven; the sol-gel method and the microemulsion reaction method have high raw material costs and long reaction time; the gas phase method has complicated processes, l

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low temperature preparing process for anatase phase nano crystal titanium dioxide of light catalystic activity
  • Low temperature preparing process for anatase phase nano crystal titanium dioxide of light catalystic activity
  • Low temperature preparing process for anatase phase nano crystal titanium dioxide of light catalystic activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036](1) Alkaline hydrolysis: with a certain amount of deionized water, the washed 25Kg (125mol) hydrated titanium dioxide slurry (containing 40wt% TiO 2 ) is formulated into a uniform suspension containing 25wt% titanium dioxide; it is slowly injected into the reactor, and at a constant temperature of 65°C, 50wt% NaOH solution is added to it, the total addition of NaOH is 250mol, and the temperature is controlled at 80-90°C ( The dosing time is about 30 minutes), and continue to stir at constant temperature for 60 minutes to obtain a sodium orthotitanate solution; then rapidly cool the solution in the kettle to room temperature at a cooling rate of about 8°C / min; (2) Add a crystal nucleus accelerator: Add potassium sulfate with a titanium dioxide content of 2.0 wt%, and stir at a constant temperature; (3) Washing: add 4 times the volume of the original liquid to the reactor to dilute with deionized water, stir, settle for 10 hours, and remove the supernatant to obtain an amor...

Embodiment 2

[0041] (1) Alkaline hydrolysis: with a certain amount of deionized water, 12.5Kg hydrated titanium dioxide dry powder (containing TiO 2 80%) was prepared into a uniform suspension containing 25wt% of titanium dioxide, which was slowly injected into the reactor, and at a constant temperature of 65°C, a 40wt% KOH solution containing 250mol of KOH was added to it quickly and then slowly, and the temperature was controlled at 80- 90°C, continue to stir at a constant temperature for 80min to obtain a potassium orthotitanate solution; then rapidly cool the solution in the kettle to room temperature at a cooling rate of about 8°C / min; (2) Add a crystal nucleus promoter: add a titanium dioxide content of 3.0 wt% antimony trichloride, stirred at constant temperature for 40 minutes; (3) washing: add 4 times the volume of the original liquid to the reactor to dilute with deionized water, stir, settle for 10 hours, remove the supernatant, and obtain an amorphous white Precipitation; (4) ...

Embodiment 3

[0043] (1) Alkaline hydrolysis: with a certain amount of deionized water, the washed 25Kg (125mol) hydrated titanium dioxide slurry (containing 40wt% TiO 2 ) is formulated into a uniform suspension containing 30wt% of titanium dioxide; it is slowly injected into the reactor, and at a constant temperature of 60°C, Na 2 CO 3 260mol of 30wt% Na 2 CO 3 solution, the temperature is controlled at 80-90°C (dosing time is about 30min), and the constant temperature stirring is continued for 60min to obtain a sodium orthotitanate solution; then the temperature is lowered to room temperature; (2) Adding a crystal nucleus accelerator: adding titanium dioxide content 1.0wt% potassium sulfate, stirred at constant temperature for about 30min; (3) washing with water: adding 4 times the volume of the stock solution in deionized water to dilute the reaction kettle, after stirring for about 30min, settling for 8h, removing the supernatant to obtain Amorphous white precipitate; (4) acid solub...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Login to view more

Abstract

The present invention relates to liquid phase process of preparing anatase phase nano crystal titanium dioxide at the temperature range of room temperature to 120 deg.c. The process includes the alkali alkaline hydrolysis of hydrated titanium dioxide as main material, cooling, adding crystal kernel promoter, water washing, acid dissolving and cooling to obtain titanium dioxide slurry with photocatalytic activity; and further washing, filtering, drying and crushing to obtain anatase phase nano crystal titanium dioxide with photocatalytic activity. The nano crystal titanium dioxide has average granularity of 10-80 nm, specific surface area of 150-300 sq m/g, powerful surface adsorption capacity, very high photocatalytic activity and organic matter degrading capacity much higher than available similar marketable products.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide, more specifically, to a low-temperature preparation method of photocatalytically active anatase phase nanocrystalline titanium dioxide. Background technique [0002] Titanium dioxide has three crystal forms, namely anatase phase, rutile phase and brookite phase. The valence band energy levels of rutile and anatase are similar, and their positions in the energy level diagram are both very low. The valence band holes (and hydroxyl radicals) of both substances are very oxidizing. Compared with the two, the anatase phase nanocrystalline titanium dioxide has higher photocatalytic activity, and it is also the most widely and deeply researched semiconductor metal oxide in photocatalytic applications. When it absorbs photons with a wavelength less than or equal to 387.5nm, it can generate electrons in the conduction band and holes in the valence band. The holes (and h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01G23/047
Inventor 杨青林江雷
Owner INST OF CHEM CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap