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Method for preparing extrafine anatase titanium dioxide nano rods

A technology of titanium dioxide and anatase phase, applied in the direction of titanium dioxide, nanostructure manufacturing, titanium oxide/hydroxide, etc., can solve the problem that the high density of the film affects the photocatalytic performance

Inactive Publication Date: 2011-04-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the dry film of peroxotitanic acid aqueous solution is an amorphous titanium peroxide hydrate, it can form a tightly bonded film on various materials at room temperature, but the high density of the film will affect its photocatalytic performance.

Method used

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  • Method for preparing extrafine anatase titanium dioxide nano rods
  • Method for preparing extrafine anatase titanium dioxide nano rods
  • Method for preparing extrafine anatase titanium dioxide nano rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Add dropwise 1M sodium hydroxide solution to 0.5M titanium tetrachloride solution at room temperature, neutralize until the pH value is approximately equal to 7, obtain a white precipitate, wash repeatedly with distilled water to obtain a gelatinous solid, take 30 grams of wet precipitate (equivalent to It is 4 grams) to be dispersed in 180 milliliters of hydrogen peroxide (30%) in 180 milliliters of hydrogen peroxide (30%), at 30 ℃ of degumming 6 hours, obtain the peroxotitanic acid aqueous solution of orange-yellow transparency, the content of titanium dioxide in the solution is 0.24M, pH value about 6. Then dilute peroxotitanic acid aqueous solution and deionized water respectively according to the mass ratio of 1:5, measure 50mL and put it into a hydrothermal reaction kettle, after 150°C hydrothermal treatment for 4h, after hydrothermal cooling to room temperature, light blue transparent sol, The concentration of titanium dioxide was 0.041M. After diluting different...

Embodiment 2

[0035] Add 2M ammonia water dropwise to 1M titanyl sulfate solution at 70°C, keep warm and hydrolyze for 6 hours, neutralize to a weakly alkaline pH value of about 8, and obtain a white precipitate, wash it repeatedly with distilled water to obtain a gel-like solid, take the wet precipitate 15 grams (2 grams converted into titanium dioxide) were dispersed in about 90 milliliters of hydrogen peroxide (35%), degummed at room temperature for 2 hours to obtain an orange-yellow transparent peroxotitanic acid hydrosol, with a pH value of about 6 . Then dilute peroxotitanic acid aqueous solution and deionized water according to the mass ratio of 1:4 respectively, measure 50mL and put it into a hydrothermal reaction kettle, after 120°C hydrothermal treatment for 4h, after hydrothermal cooling to room temperature, a light blue transparent sol, The concentration of titanium dioxide was 0.05M. The titanium dioxide contained therein is anatase phase through transmission electron microsco...

Embodiment 3

[0037] After raising the temperature of 0.5 mol / L titanium sulfate solution to 50°C, add 1.5 mol / L ammonia solution dropwise to the solution, keep it warm for 10 hours for hydrolysis, neutralize until the pH value is about equal to 7, and obtain a white precipitate, which is washed repeatedly with distilled water to obtain Gel-like solid, get wet precipitate 40 grams (converted into titanium dioxide to be 6.2 grams) and disperse it in 280 milliliters of hydrogen peroxide (35%) solution, degumming 12 hours, obtain orange-yellow transparent peroxotitanic acid hydrosol, pH The value is about 6. Then dilute peroxotitanic acid aqueous solution and deionized water respectively according to the mass ratio of 1:8, measure 50mL and put it into a hydrothermal reaction kettle, undergo hydrothermal treatment at 120°C for 4h, then undergo hydrothermal treatment at 180°C for 24h, and then cool to Light blue transparent sol at room temperature, the concentration of titanium dioxide is 0.042M...

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Abstract

The invention relates to a method for preparing extrafine anatase titanium dioxide nano rods, which comprises that: (1) titanium containing inorganic substances are hydrolyzed, the temperature is raised to be between 20 and 100 DEG C, inorganic base solution is added for heat preservation and hydrolysis and neutralizes pH to between 7 and 8, and precipitation of hydrous titanium dioxide is obtained; (2) the precipitation is repeatedly washed, added with oxyful, stirred and subjected to ultrasonic dispersion, the temperature is raised to be between 0 and 50 DEG C and the heat is preserved for 1to 24 hours; and (3) water solution of pertitanic acid is diluted by deionized water, then filled into a hydrothermal reaction kettle, subjected to hydrothermal treatment at a temperature between 100and 250 DEG C for 2 to 48 hours, and cooled to room temperature. The preparation method is simple; the obtained sol does not contain organic stabilizer; and the titanium dioxide in the sol is anatase, has a rod-shaped structure and high length-diameter ratio, and can form extrafine rod-shaped nanocrystal titanium dioxide.

Description

technical field [0001] The invention belongs to the field of preparation of titanium dioxide nanorods, in particular to a preparation method of ultrafine anatase phase titanium dioxide nanorods. Background technique [0002] In recent years, as a broadband semiconductor material, titanium dioxide nanocrystals have broad application prospects in photocatalysts, solar cells, sensors and microporous films due to their unique optical and electrical properties. Nano-titanium dioxide products can not only replace titanium dioxide micropowder to increase its light quantum yield, but also can be fixed on various carriers to make titanium dioxide film. Titanium dioxide film materials can avoid the problem of difficult recovery of nanoparticles in practical applications. Titanium dioxide film can undergo photocatalytic reaction under the irradiation of ultraviolet rays, which is used to degrade organic matter in sewage, sterilize and disinfect. At the same time, due to the super hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B82B3/00
Inventor 张青红李爽钱迪峰王宏志李耀刚
Owner DONGHUA UNIV
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