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A preparation method of crystal porous composite titanium dioxide for air purification

A titanium dioxide and crystal technology, applied in the field of crystalline porous composite titanium dioxide and its preparation, can solve the problems of limited material purification efficiency, poor optical activity, amorphous structure, etc., achieve adsorption and photocatalytic degradation performance improvement, good crystallinity, high crystallinity degree of effect

Active Publication Date: 2017-12-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the pollutant concentration is low, the adsorption rate will become the limiting condition, and the indoor pollutant concentration is very low (ppb level), so the adsorption rate of the catalyst limits the purification efficiency of the material
In order to improve the adsorption capacity of titanium dioxide photocatalysts for low concentrations, it is necessary to develop microporous titanium dioxide with a microporous structure to enhance its adsorption performance, but at the same time, micropores will cause a large number of defects in the material, poor crystallinity, an amorphous structure, and optical activity. Difference

Method used

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  • A preparation method of crystal porous composite titanium dioxide for air purification
  • A preparation method of crystal porous composite titanium dioxide for air purification
  • A preparation method of crystal porous composite titanium dioxide for air purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix hydrochloric acid and titanium tetrachloride, wherein the molar ratio of hydrogen chloride to titanium tetrachloride is 1:28. Anatase and rutile mixed crystal titanium dioxide (P25, 80% anatase and 20% rutile) were added to the obtained solution to form a suspension with a mass ratio of 1:15, and stirred in a water bath at 70°C for 1 h. The obtained suspension is centrifuged and washed 5 times with water until the pH value is 6, the obtained suspension is centrifuged or filtered, and the obtained solid is naturally air-dried or oven-dried. The obtained solid powder was heated at 500° C. for 30 min to obtain the seed crystal P25 solid. Under vigorous stirring conditions, the prepared seed crystal P25 solid powder was added to absolute ethanol to form a suspension with a concentration of 8 g / L, and the suspension was stirred for 0.5 h. Dodecylamine was added to the above suspension to form a suspension with a concentration of dodecylamine of 2 mmol / L. Add butyl tita...

Embodiment 2

[0041]Mix hydrochloric acid and titanium tetrachloride, wherein the molar ratio of hydrogen chloride to titanium tetrachloride is 1:28. Anatase titanium dioxide was added to the obtained solution to form a suspension with a mass ratio of 1:10, and stirred in a water bath at 70°C for 1 hour. The obtained suspension was centrifuged and washed 7 times with water until the pH value was 7, the obtained suspension was centrifuged or filtered, and the obtained solid was naturally air-dried or oven-dried. The obtained solid powder was heated at 600° C. for 60 min to obtain a seed crystal anatase titanium dioxide solid. Under vigorous stirring conditions, the obtained anatase-type titanium dioxide solid powder with seed crystals was added into absolute ethanol to form a suspension with a concentration of 10 g / L, and the suspension was stirred for 1 h. Dodecylamine was added to the above suspension to form a suspension with a concentration of dodecylamine of 6 mmol / L. Add butyl titana...

Embodiment 3

[0047] Mix hydrochloric acid and titanium tetrachloride, wherein the molar ratio of hydrogen chloride to titanium tetrachloride is 1:30. Crystalline titanium dioxide was added to the obtained solution to form a suspension with a mass ratio of 1:5, and stirred in a water bath at 50°C for 5 hours. The obtained suspension was centrifuged and washed 7 times with water until the pH value was 7, the obtained suspension was centrifuged or filtered, and the obtained solid was naturally air-dried or oven-dried. The obtained solid powder was heated at 350° C. for 100 min to obtain a seed crystal titanium dioxide solid. Under vigorous stirring conditions, the prepared seed crystal titanium dioxide solid powder was added into absolute ethanol to form a suspension with a concentration of 20 g / L, and the suspension was stirred for 1 h. Dodecylamine was added to the above suspension to form a suspension with a concentration of dodecylamine of 0.1 mmol / L. Butyl titanate was added to the abs...

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Abstract

The invention provides a preparation method of crystal porous composite titanium dioxide for purifying air. The method includes: mixing a diluted hydrochloric acid solution with titanium tetrachloride to obtain a seed crystal solution, adding crystal titanium dioxide into the seed crystal solution, performing water bath stirring and centrifugation, subjecting the obtained solid to natural air drying or drying, calcining the solid in a muffle furnace to obtain a seed crystal titanium dioxide solid; under intense stirring conditions, adding the prepared seed crystal titanium dioxide solid and dodecylamine into anhydrous ethanol to form an ethanol suspension of seed crystal titanium dioxide solid and dodecylamine, adding butyl titanate into the solution, then adding distilled water and performing stirring, then putting the mixture into a reaction kettle to carry out hydrothermal reaction, then performing natural cooling and centrifugation to obtain a solid, firstly subjecting the solid to pickling by an ethanol-hydrochloric acid solution, then conducting washing to neutral, and carrying out centrifugation, natural air drying or drying so as to obtain the crystal porous composite titanium dioxide material. The material provided by the invention has good crystallinity and abundant micropore structures, and can achieve efficient adsorption-photocatalytic degradation of low concentration organic pollutants.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a crystalline porous composite titanium dioxide for purifying air and a preparation method thereof. Background technique [0002] In recent years, my country's air environment has continued to deteriorate, and the emergence of extreme weather such as smog and sandstorms has made people pay more and more attention to air pollution. In recent years, many efficient air purification technologies have been developed. Among them, photocatalysts represented by titanium dioxide have outstanding advantages such as low cost and environmental friendliness. Therefore, the corresponding photocatalytic technology is also very promising. When the pollutant concentration is low, the adsorption rate will become the limiting condition, and the indoor pollutant concentration is very low (ppb level), so the adsorption rate of the catalyst limits the purification efficiency of the material. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30B01D53/86B01D53/44B01J21/06B01J35/10C01G23/053A61L9/00
CPCA61L9/00B01D53/8687B01D2255/20707B01D2257/70B01J20/06B01J21/063B01J35/10B01J2220/42B01J2220/4806B01J2220/4812C01G23/053C01G23/0536
Inventor 吕金泽张旻付强
Owner JIANGNAN UNIV
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