Preparation method for anatase type microporous titanium dioxide material for purifying indoor air

A titanium dioxide and anatase type technology, applied in the field of photocatalysis, can solve problems such as poor crystallinity, poor optical activity, and amorphous results, and achieve the effects of large crystallinity, improved adsorption and photocatalytic degradation performance, and reduced indoor health risks

Active Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, micropores will lead to a large number of defects in the material, poor crystallinity, amorphous results, and poor optical activity.
At present, there is no report on the successful synthesis of crystalline titanium dioxide containing a large number of microporous structures.

Method used

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  • Preparation method for anatase type microporous titanium dioxide material for purifying indoor air
  • Preparation method for anatase type microporous titanium dioxide material for purifying indoor air
  • Preparation method for anatase type microporous titanium dioxide material for purifying indoor air

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dodecylamine was added to absolute ethanol to form a 2 mmol / L ethanol solution of dodecylamine. Butyl titanate was added to the absolute ethanol solution to form a butyl titanate ethanol solution with a concentration of 100 mmol / L. Add 10mL butyl titanate ethanol solution dropwise to 10mL dodecylamine ethanol solution and mix evenly, then add 6.7mL distilled water, stir vigorously for 2 hours at the same time, then add the reaction kettle with PTFE liner, 115 ℃ hydrothermal reaction for 24 hours , naturally cooled and centrifuged. Take 1 g of solid and add it to 100 g of ethanol-hydrochloric acid solution, stir for 1 h, centrifuge, and wash the obtained solid in ethanol-hydrochloric acid solution twice. The solid obtained after centrifugation was washed with water until the pH value was 7, centrifuged, and naturally air-dried to obtain a highly active anatase microporous titanium dioxide material, which was recorded as Micro-TiO 2 .

[0025] Take residence time 0.036...

Embodiment 2

[0030] Dodecylamine was added to absolute ethanol to form a 0.1 mmol / L ethanol solution of dodecylamine. Butyl titanate was added to the absolute ethanol solution to form a butyl titanate ethanol solution with a concentration of 1 mmol / L. Add 10mL of butyl titanate ethanol solution dropwise to 5mL of dodecylamine ethanol solution and mix evenly, then add 2.5mL of distilled water, stir vigorously for 1 hour at the same time, then add to a reaction kettle with a tetrafluoroethylene liner, conduct a hydrothermal reaction at 100°C for 48 hours, and naturally Cool down and centrifuge. Take 1 g of solid and add it to 10 g of ethanol-hydrochloric acid solution, stir for 1 h, centrifuge, and wash the obtained solid in ethanol-hydrochloric acid solution for 3 times. The solid obtained after centrifugation is washed with water until the pH value is 6, centrifuged, and dried to obtain a highly active anatase microporous titanium dioxide material.

Embodiment 3

[0032] Dodecylamine was added to absolute ethanol to form a dodecylamine ethanol solution with a concentration of 6 mmol / L. Butyl titanate was added to the absolute ethanol solution to form a butyl titanate ethanol solution with a concentration of 500 mmol / L. Add 10mL of butyl titanate ethanol solution dropwise to 20mL of dodecylamine ethanol solution and mix evenly, then add 40mL of distilled water, stir vigorously for 3 hours at the same time, then add to the reaction kettle with PTFE liner, conduct hydrothermal reaction at 130°C for 12 hours, and cool down naturally And centrifugal. Take 1 g of solid and add it to 250 g of ethanol-hydrochloric acid solution, stir for 4 hours, centrifuge, and wash the obtained solid in ethanol-hydrochloric acid solution for 4 times. The solid obtained after centrifugation was washed with water until the pH value was 8, centrifuged, and naturally air-dried to obtain a highly active anatase microporous titanium dioxide material.

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Abstract

The invention discloses a preparation method for an anatase type microporous titanium dioxide material for purifying indoor air. That crystal form titanium dioxide containing a large number of micropore structures is synthesized successfully is not reported at present. The preparation method comprises the following steps: a butyl titanate ethanol solution and a dodecylamine ethanol solution are mixed according to the volume ratio of 1:(0.5-2), so that a mixed solution is obtained; distilled water is added into the mixed solution, stirring is performed for 1-3 h, then the stirred mixed solution is added into a reaction kettle for hydrothermal reaction at the temperature of 100-130 DEG C for 12-48 h, natural cooling and centrifugation are performed, the solid is taken out and then added into an ethanol-hydrochloric acid solution, stirring for reaction is performed for 1-4 h, and centrifugation is performed; the operation process for cleaning the solid by using the ethanol-hydrochloric acid solution is repeated for 2-4 times; the solid obtained after centrifugation is washed with water until the pH value is to be 6-8, centrifugation is performed, and natural air drying or drying is performed, so that the anatase type microporous titanium dioxide material with high activity is obtained. The bore diameter of the material prepared through the preparation method is less than 2 nm, and meanwhile, the material has relatively good crystallinity, is of an anatase type, and can be used for efficient adsorption / photocatalytic degradation of organic pollutants with low concentration.

Description

technical field [0001] The invention belongs to photocatalysis technology, and in particular relates to a preparation method of anatase microporous titanium dioxide material for purifying indoor air. Background technique [0002] With the deterioration of our country's air environment, it is imminent to develop efficient air purification technology. Photocatalytic technology represented by titanium dioxide semiconductor is a promising indoor air purification technology. However, due to the low concentration of indoor pollutants (ppb level), the adsorption rate of pollutants on the catalyst surface is much lower than the degradation rate, which limits the purification efficiency of the material. In order to improve the adsorption capacity of TiO photocatalysts to low concentrations, it is necessary to develop microporous TiO with micropores (pore size less than 2 nm). But at the same time, micropores will lead to a large number of defects in the material, poor crystallinity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01D53/86B01D53/72
Inventor 朱利中吕金泽
Owner ZHEJIANG UNIV
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