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Low temperature crystallized nano titanium dioxide powder and sol synthesizing method

A nano-titanium dioxide and crystallization technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high production cost and high equipment requirements, and achieve the effect of reducing equipment requirements, high photocatalytic activity and white particles

Inactive Publication Date: 2007-03-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it uses corrosive titanium tetrachloride as the precursor, it requires high equipment, so the cost of industrial production is too high

Method used

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  • Low temperature crystallized nano titanium dioxide powder and sol synthesizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Sulfuric acid with a concentration of 80% is heated to dissolve ilmenite (mass ratio ilmenite: sulfuric acid = 1: 2), and the obtained solid phase sediment is obtained by leaching with water to obtain titanium liquid, and the titanium liquid is filtered to remove insoluble slag, frozen and recrystallized The ferrous sulfate is removed by filtration to obtain a titanium-containing precursor solution; the pH value of the precursor solution is adjusted to 7 with ammonia water to obtain orthotitanic acid precipitation. Take 80g of orthotitanic acid precipitate and add 20ml of 30% hydrogen peroxide solution to dissolve, use 30% HNO3 to adjust pH=2, dilute the resulting solution to 200ml, and reflux at 100°C for 6 hours to obtain a yellow-orange transparent titanium dioxide nanosol.

Embodiment 2

[0052] Orthotitanic acid precipitate was obtained in the same manner as in Example 1. Take 80g of orthotitanic acid precipitate and add 20ml of 30% hydrogen peroxide solution to dissolve, adjust the pH to 0.5 with 30% nitric acid, dilute the resulting solution to 200ml with pure water, reflux at 100°C for 6 hours to obtain a milky white precipitate, and obtain nano titanium dioxide after vacuum drying Powder, XRD spectrogram measurement result confirms that it is anatase type titanium dioxide crystal, see accompanying drawing 1.

Embodiment 3

[0054] Sulfuric acid with a concentration of 80% is heated to dissolve aluminum titanate, and the obtained solid-phase deposit is leached with water to obtain titanium liquid, the titanium liquid is filtered to remove insoluble slag, and frozen and recrystallized to filter and remove aluminum sulfate to obtain a titanium-containing precursor solution; Precipitation of orthotitanic acid is obtained by heating the precursor solution. Take 80g of orthotitanic acid precipitate and add 20ml of 30% hydrogen peroxide solution to dissolve, use 30% HCl to adjust pH=2, dilute the resulting solution to 200ml, and reflux at 100°C for 6 hours to obtain a yellow-orange transparent titanium dioxide nanosol.

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Abstract

The invention belongs to an organic metal oxide-TiO2 photocatalyst preparing process, especially relating a synthesizing method of low temperature-crystallizing nanometer TiO powder and sol with high catalytic activity. And it obtains n-titanic acid deposit by making alkali neutralization and dilution hydrolyzation or heating hydrolyzation on titanic solution, and implements synthesizing related system nano crystal materials with normal-pressure and low-temperature liquid phases by such a processing process of re-dispersing the deposit by oxydol. And it largely reduces the cost of raw materials and avoids using titanium tetrachloride with strong corrosivity, reducing equipment requirements.

Description

technical field [0001] The invention belongs to the preparation process of inorganic metal oxide-titanium dioxide photocatalyst, in particular to a synthesis method of low-temperature crystallized nano-titanium dioxide powder and sol with high catalytic activity. Background technique [0002] Titanium dioxide is an important inorganic chemical raw material, used as a white pigment in coatings, inks, paper, plastics, rubber, synthetic fibers and other industries; at the same time, it also has important applications in ceramics, welding electrodes, electronics, metallurgy and other industries. The synthesis of powdered titanium dioxide is generally produced by sulfuric acid method and chlorination method: the traditional sulfuric acid method has a long process for industrial production of titanium dioxide, discharges a lot of three wastes, and the obtained product has a large and uneven particle size, which is difficult to control; while chlorination The method has high requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 只金芳吴良专
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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