A preparation method of adsorption-enhanced visible-light catalysis low-concentration vocs titanium dioxide composite material

A technology of titanium dioxide and composite materials, which is applied in the field of photocatalysis, can solve the problems of low utilization rate of light energy, achieve the effects of improving adsorption and photocatalytic degradation performance, large specific surface area, and reducing indoor health risks

Active Publication Date: 2017-03-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the traditionally synthesized titanium dioxide can only use ultraviolet light, and ultraviolet light only accounts for about 5% of sunlight, the utilization rate of light energy is low

Method used

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  • A preparation method of adsorption-enhanced visible-light catalysis low-concentration vocs titanium dioxide composite material
  • A preparation method of adsorption-enhanced visible-light catalysis low-concentration vocs titanium dioxide composite material
  • A preparation method of adsorption-enhanced visible-light catalysis low-concentration vocs titanium dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix hydrochloric acid with titanium tetrachloride, wherein the molar ratio of hydrogen chloride to titanium tetrachloride is 1:28. Add P25 to the obtained solution to form a suspension with a mass ratio of 1:15, and stir in a water bath at 80°C for 1 hour. The obtained suspension was centrifuged and washed 5 times with water, and the obtained solid was naturally air-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 powder was added into absolute ethanol to form a suspension with a concentration of 8 g / L, and the suspension was stirred for 0.1 h. Add 4-ethylaniline to the above suspension to form a mixed solution with a 4-ethylaniline concentration of 2 mmol / L. Add butyl titanate to the absolute ethanol solution to form a butyl titanate ethanol solution with a concentration of 300 mmol / L. Add the butyl titanate ethanol solution dropwise to the above mixed solution, t...

Embodiment 2

[0034] Mix hydrochloric acid with titanium tetrachloride, wherein the molar ratio of hydrogen chloride to titanium tetrachloride is 1:40. Add P25 to the obtained solution to form a suspension with a mass ratio of 1:15, and stir in a water bath at 80°C for 2 hours. The obtained suspension was centrifuged and washed 12 times with water, and the obtained solid was naturally air-dried. The obtained solid powder was heated at 300° C. for 350 min to obtain a seed crystal P25 solid. Under the condition of vigorous stirring, the prepared powder was added into absolute ethanol to form a suspension with a concentration of 1 g / L, and the suspension was stirred for 0.1 h. Add 4-ethylaniline to the above suspension to form a mixed solution with a 4-ethylaniline concentration of 2 mmol / L. Add butyl titanate to the absolute ethanol solution to form a butyl titanate ethanol solution with a concentration of 300 mmol / L. Add the butyl titanate ethanol solution dropwise to the above mixed solu...

Embodiment 3

[0037]Mix hydrochloric acid with titanium tetrachloride, wherein the molar ratio of hydrogen chloride to titanium tetrachloride is 1:10. Add P25 to the obtained solution to form a suspension with a mass ratio of 1:60, and stir in a water bath at 60°C for 5 hours. The obtained suspension was centrifuged and washed 5 times with water, and the obtained solid was naturally air-dried. The obtained solid powder was heated at 500° C. for 30 min to obtain the seed crystal P25 solid. Under the condition of vigorous stirring, the obtained powder was added into absolute ethanol to form a suspension with a concentration of 30 g / L, and the suspension was stirred for 1.5 h. Add 4-ethylaniline to the above suspension to form a mixed solution with a 4-ethylaniline concentration of 0.2 mmol / L. Add butyl titanate to the absolute ethanol solution to form a butyl titanate ethanol solution with a concentration of 600 mmol / L. Add the butyl titanate ethanol solution dropwise to the above mixed so...

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Abstract

The invention discloses a preparation method of a titanium dioxide composite material for absorption enhanced visible light catalysis of low-concentration VOCs. The preparation method comprises the following steps: mixing a diluted hydrochloric acid solution and titanium tetrachloride, pouring titanium dioxide crystal, stirring and centrifuging, naturally air-drying the obtained solids or drying, calcining to obtain seed crystal titanium dioxide solid; violently stirring, adding the prepared seed crystal titanium dioxide solid and 4-ethylaniline into anhydrous ethanol, adding butyl titanate into the above solution, adding distilled water, stirring and carrying out a hydrothermal reaction in a reaction vessel, cooling and centrifuging to obtain a solid, pickling the solid with an ethanol-hydrochloric acid solution, washing to neutral and centrifuging, and drying to obtain the crystal porous composite titanium dioxide material. According to the invention, 4-ethylaniline is used as a template to synthesize micropore-crystal composite titanium dioxide by a low-temperature hydrothermal method. The prepared material has good absorbency of visible light and rich micropore structure and crystal structure, can fully utilize visible light, and has excellent adsorption and degradation effects.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a composite TiO with adsorption enhanced visible light catalytic purification of VOCs 2 method of preparation. Background technique [0002] Some organic pollutants in VOCs have carcinogenic, teratogenic, and mutagenic hazards, which seriously threaten human health. It is imminent to develop efficient VOCs purification technology. Photocatalytic technology represented by titanium dioxide semiconductor is a very promising VOCs purification technology. However, due to the low concentration of VOCs (the concentration of VOCs produced by automobile assembly and semiconductor component production is about several hundred ppm, and the concentration of indoor VOCs is about several ppm), the adsorption rate of pollutants on the surface of the catalyst is much lower than the degradation rate, which limits the material purification efficiency. In order to improve the adsorption c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B01J20/06B01J20/30B01J20/28B01D53/86B01D53/44
CPCB01D53/8687B01D2255/20707B01D2257/708B01D2259/128B01J20/06B01J20/2808B01J2220/42B01J2220/4806B01J2220/4812C01G23/0534C01G23/0536
Inventor 吕金泽付强孙露娜
Owner JIANGNAN UNIV
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