Preparation method and application of nitrogen-doped titanium dioxide heterojunction structure

A titanium dioxide and heterostructure technology, applied in the field of photocatalytic materials, can solve problems such as nanoparticle heterostructures that have not yet been seen, and achieve the effects of being conducive to the separation of photogenerated charges, high photocatalytic efficiency, and low energy consumption

Inactive Publication Date: 2012-01-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching the literature and patents, no one-step method has been found so far to achieve nitrogen-doped anatase TiO 2 Nanorod / Brookite TiO 2 Related reports on nanoparticle heterostructure

Method used

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  • Preparation method and application of nitrogen-doped titanium dioxide heterojunction structure
  • Preparation method and application of nitrogen-doped titanium dioxide heterojunction structure
  • Preparation method and application of nitrogen-doped titanium dioxide heterojunction structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Prepare a mixed solution of 2.5 mL of tetrabutyl titanate and 47.5 mL of isopropanol. Under stirring at 300 r / min, add the mixed solution dropwise to 200 mL of distilled water at pH<2 at 1°C, and ensure that the time for dropping is not less than 0.5 h. Keeping warm and stirring continuously for 12 hours, a translucent titanium dioxide sol was obtained.

[0047] Take 35mL titanium dioxide sol, mix it with 35mL 80wt% hydrazine hydrate solution, and disperse it ultrasonically for 5 minutes to obtain a milky suspension; transfer all the milky suspension to a PTFE container with a volume of 100 mL, and then place Place in a stainless steel reaction kettle, seal the kettle, and conduct a static heat preservation reaction at 200°C for 48h. The obtained solid was washed twice with water, filtered with suction, and dried to obtain sample S-1.

[0048] The application of nitrogen-doped titanium dioxide heterostructure in the decolorization and purification of organic dye aqueou...

Embodiment 2

[0057] Take 18mL of the titanium dioxide sol prepared in Example 1, mix it with 54mL of 60wt% ethylenediamine solution, and disperse it ultrasonically for 5 minutes to obtain an emulsion suspension; transfer all the emulsion suspension to a polytetrafluoroethylene container with a volume of 100mL , and then put the polytetrafluoroethylene container in a stainless steel reaction kettle, seal the kettle, and conduct a static heat preservation reaction at 180°C for 72h. The obtained solid was washed three times with water, filtered with suction, and dried to obtain sample S-2.

[0058] The composition and nitrogen content of the obtained sample S-2 are shown in Table 1; figure 1 ; image 3 ;

[0059] The application steps are as in Example 1.

[0060] Figure 6 UV photocatalytic degradation concentration 10 -3 The results for an aqueous solution of M methyl orange, Figure 7 The visible light catalytic degradation concentration of λ>400nm is 10 -4 M Results for Rhodamine B a...

Embodiment 3

[0062] Make a mixed solution of 2.5mL of titanium tetrachloride and 47.5mL of isopropanol, and add the mixed solution dropwise to 200mL of distilled water at 5°C with a pH<2 under stirring at 300r / min, and ensure that the dropping time is not less than 0.5h. Keeping warm and stirring continuously for 6 hours, a transparent titanium dioxide sol was obtained.

[0063] Take 30mL titanium dioxide sol, mix it with 50mL 40wt% hydrazine hydrate solution, and ultrasonically disperse it for 5 minutes to obtain a milky suspension; transfer all the milky suspension to a PTFE container with a volume of 100mL, and then place the Place it in a stainless steel reaction kettle, seal the kettle, and conduct a static heat preservation reaction at 180°C for 72h. The obtained solid was washed three times with water, filtered with suction, and dried to obtain sample S-3.

[0064] The composition and nitrogen content of the obtained sample S-3 are shown in Table 1; figure 1 ; Figure 4 ;

[006...

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Abstract

The invention relates to a preparation method and application of a nitrogen-doped titanium dioxide heterojunction structure with a visible light catalytic performance, which belongs to the technical field of photocatalysis materials. The method comprises the following steps of: a. preparing analytically pure titanic acid ester or titanium tetrachloride and analytically pure isopropanol into a mixed solution, continuously stirring, dropping the mixed solution in distilled water and stirring for 6-24h to obtain titanium oxide sol; b. mixing the titanium oxide sol with 40-80 percent by weight ofhydrazine hydrate or 60-80 percent of quadrol water solution, then carrying out ultrasonic dispersion on the mixed solution, transferring the mixed solution to an airtight and corrosion-resistant reaction kettle and preserving heat and reacting for 36-72h to obtain a solid product; and c. washing, suction filtering and drying the mixed solution for 6-12h to obtain powder of the nitrogen-doped titanium dioxide heterojunction structure. The preparation technology used by the invention is simple and low in energy consumption; and the prepared nitrogen-doped titanium dioxide heterojunction structure has high efficiency for photocatalytic degradation of organic dye.

Description

technical field [0001] The invention relates to a preparation method and application of a nitrogen-doped titanium dioxide heterostructure with visible light catalytic performance, and belongs to the technical field of photocatalytic materials. Background technique [0002] Titanium dioxide (TiO 2 ) has the characteristics of high catalytic activity, chemical stability, non-toxicity, low price and easy availability, and has been widely researched and applied in the fields of photocatalysis, photoelectrochemistry, solar cells, gas sensing and medical treatment. However, due to TiO 2 The band gap is wide (3.0-3.2eV), and it can only absorb ultraviolet (UV) light (λ<380nm) that accounts for a small part (5%) of the solar spectrum energy, thus limiting its use in a larger part of the solar spectrum energy ( 45%) in the application of visible light exposure occasions. Therefore, how to broaden the TiO 2 The wide range of photoresponse enables it to be effectively used in vi...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30
Inventor 盖利刚段秀全姜海辉周国伟
Owner QILU UNIV OF TECH
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