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Method for preparing titanium dioxide by integrating adsorption and photocatalysis

A titanium dioxide and photocatalysis technology, applied in the field of photocatalysis, can solve the problems of low purification efficiency of low-concentration pollutants, impractical application, short contact time, etc., to reduce indoor health risks, wide use places, and wide application prospects Effect

Active Publication Date: 2012-06-13
ZHEJIANG UNIV
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Problems solved by technology

This is mainly because there are several problems in this technology: 1. When it is actually applied to equipment such as purifiers or air conditioners, due to the large air volume, the contact time between gas pollutant molecules and catalytic materials is very short, and the pollutant molecules are transferred from the gas phase to the surface of the catalyst. Mass transfer becomes the limiting step, so the efficiency of common photocatalytic materials to purify low-concentration pollutants is low, which cannot meet the requirements of practical applications; 2. The purification efficiency of photocatalytic materials will decrease with the increase of humidity, and some materials will The catalytic efficiency drops significantly
Our southern and coastal areas are generally humid, so there are restrictions on the application of photocatalytic technology in these areas

Method used

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  • Method for preparing titanium dioxide by integrating adsorption and photocatalysis
  • Method for preparing titanium dioxide by integrating adsorption and photocatalysis
  • Method for preparing titanium dioxide by integrating adsorption and photocatalysis

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preparation example Construction

[0021] The preparation method of adsorption-photocatalysis integrated titanium dioxide of the present invention comprises the following steps:

[0022] 1. Mix dodecyl-2-pyridine-methylamine with a volume ratio of 1~4:50 and absolute ethanol under stirring conditions to obtain the first mixed solution;

[0023] 2. Mix butyl titanate and absolute ethanol with a volume ratio of 1~2:30 to obtain the second mixed solution;

[0024] 3. Add the second mixed solution of step 2 dropwise to the first mixed solution of step 1 to obtain the third mixed solution, the volume ratio of the second mixed solution to the first mixed solution is 1:0.5~2;

[0025] 4. Add water to the third mixed solution obtained in step 3 under stirring, the volume ratio of water to the third mixed solution is 1-3:3, and stir for 2 h to obtain the fourth mixed solution;

[0026] 5. Add the fourth mixed solution obtained in step 4 into a reaction kettle with a PTFE liner, conduct a hydrothermal reaction at 80°C f...

Embodiment 1

[0034] 1. Mix dodecyl-2-pyridine-methylamine with a volume ratio of 2:50 and absolute ethanol under stirring conditions to obtain the first mixed solution;

[0035] 2. Mix butyl titanate and absolute ethanol with a volume ratio of 1:30 to obtain a second mixed solution;

[0036] 3. Add the second mixed solution in step 2 dropwise to the first mixed solution in step 1 to obtain the third mixed solution, the volume ratio of the second mixed solution to the first mixed solution is 1:1;

[0037] 4. Add water to the third mixed solution obtained in step 3 under stirring, the volume ratio of water to the third mixed solution is 1:3, and stir for 2 h to obtain the fourth mixed solution;

[0038] 5. Add the fourth mixed solution obtained in step 4 into a reaction kettle with a PTFE liner, conduct a hydrothermal reaction at 80°C for 24 h and centrifuge to obtain the first solid;

[0039] 6. Add the first solid obtained in step 5 into absolute ethanol, the mass ratio of ethanol to soli...

Embodiment 2

[0046] Steps 1-7 are the same as in Example 1, and step 8 is as follows: Take 600 μl of dodecyl-2-pyridine-methylamine and add it to 30 ml of absolute ethanol, dissolve 1.7 ml of butyl titanate in 30 ml of absolute ethanol , slowly drop into the ethanol solution of dodecyl-2-pyridine-methylamine, add 20 ml of ultrapure water, stir for 2 h, transfer to a hydrothermal reaction kettle with a PTFE liner, and conduct a hydrothermal reaction at 80 °C for 24 h , naturally cooled and centrifuged, the obtained solid was dispersed with 250 ml of absolute ethanol, adjusted to pH 3 with concentrated hydrochloric acid, shaken for 4 h, centrifuged, then repeatedly rinsed with ethanol-HCl for 3 times, centrifuged, and the obtained solid was dispersed in 50 ml of ultra pure water, stirred for 30 min, centrifuged, rinsed repeatedly with ultrapure water until the pH of the solution was 7, centrifuged, and dried at 60°C.

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Abstract

The invention discloses a method for preparing titanium dioxide by integrating adsorption and photocatalysis, which is characterized in that dodecyl-2-pyridine-methylamine is taken as a template, performed hydro-thermal reaction under ethanol-water system condition, an ethanol-hydrochloric acid solution is used for extracting the template to obtain an intermediate, a water passivation method is used for processing to obtain the titanium dioxide by integrating adsorption and photocatalysis. Compared with current materials, the adsorption, catalysis and moisture resistance of the prepared material under high wind speed (short connection time) condition possess substantial superiority, the method of the invention possesses wide application prospect in the indoor air pollution treatment field.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a method for preparing an adsorption-photocatalysis integrated titanium dioxide for purifying indoor gaseous organic pollutants. Background technique [0002] Low-concentration gas pollution such as indoor air pollution seriously endangers human health, and its purification technology has attracted more and more attention. Photocatalytic purification is considered to be the most promising indoor air purification technology, which has the advantages of light energy utilization, low cost, non-toxicity and extensive degradation of pollutants. But this technology has not yet been put into practical application in large quantities in the world, and there is no related product in our country. This is mainly because there are several problems in this technology: 1. When it is actually applied to equipment such as purifiers or air conditioners, due to the large air vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30B01J21/06B01J35/10
Inventor 朱利中吕金泽
Owner ZHEJIANG UNIV
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