N-doped nano-TiO2 and shock wave preparation method thereof

A shock wave and nanotechnology, which is applied in the field of N-doped nano-TiO2 and its shock wave preparation, can solve the problems of high-efficiency absorption of difficult visible light and low element doping, and achieve the effect of simple process, low cost and good visible light catalytic activity

Inactive Publication Date: 2012-08-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of element doping in conventional doping methods is low, and it is difficult to expand its efficient absorption of visible light in a large range.

Method used

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  • N-doped nano-TiO2 and shock wave preparation method thereof
  • N-doped nano-TiO2 and shock wave preparation method thereof
  • N-doped nano-TiO2 and shock wave preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of N-doped nano-TiO 2 The shock wave preparation method, described method process is as follows:

[0030] Step 1, metatitanic acid (H 2 TiO 3 ) and dicyandiamide (C 2 N 4 h 4 ) after uniform mixing, mechanical ball milling for 10 min to obtain mixed powder;

[0031] Wherein, the quality of metatitanic acid: the quality=4:1 of dicyandiamide;

[0032] Step 2, pressing the mixed powder into a blank, the density of the blank is 55%;

[0033] Step 3. Hit the preform with flying pieces driven by explosive detonation, and use the instantaneous high temperature and high pressure induced by the impact to obtain N-doped nano-TiO 2 ;

[0034] Among them, such as figure 1 As shown, N-doped nano-TiO was prepared by shock wave 2 The device comprises: flyer drive unit, sample box unit and support 5; Wherein the flyer drive unit includes detonator 1, booster charge 2, explosive 3 and flyer 4; Sample box unit includes sample box 6 and stopper 7; In the flyer drive unit...

Embodiment 2

[0042] A kind of N-doped nano-TiO 2 The shock wave preparation method, described method process is as follows:

[0043] Step 1, metatitanic acid (H 2 TiO 3 ) and dicyandiamide (C 2 N 4 h 4 ) after uniform mixing, mechanical ball milling for 10 min to obtain mixed powder;

[0044] Wherein, the quality of metatitanic acid: the quality=7:3 of dicyandiamide;

[0045] Step 2, pressing the mixed powder into a blank, the density of which is 45%;

[0046] Step 3. Hit the preform with flying pieces driven by explosive detonation, and use the instantaneous high temperature and high pressure induced by the impact to obtain N-doped nano-TiO 2 ;

[0047] Preparation of N-doped Nano TiO by Shock Wave 2 The device is the same as in Example 1; the specific process is: the compacted blank 7 is packed into the sample box 6, and the blank 7 is fixed with a plug, and the sample box 6 and the plug 8 are in close contact with the blank 7; The flyer drive unit is installed on the support 5...

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Abstract

The invention discloses N-doped nano-TiO2 and a shock wave preparation method thereof, belonging to the technical field of material processing and combination. As for the N-doped nano-TiO2, the particle size is 5-20nm, the specific surface area is 98-355m<2> / g, and the N doping concentration is 2.7-4%. The preparation method comprises the following steps of: mixing metatitanic acid with dicyandiamide to get a powder preform, and utilizing instantaneous high temperature and high pressure generated by high-speed impact of a driven flyer plate to perform decomposition reaction on the metatitanic acid, wherein H2TiO3 is transformed to TiO2 and H2O; simultaneously decomposing a doped nitrogen source C2N4H4 under the action of shock waves; and enabling released N atoms to be synchronously doped into a TiO2 crystal lattice during the TiO2 forming process to get the N-doped nano-TiO2. The N-doped nano-TiO2 has the advantages of small particle size, large specific surface area, high N doping concentration and better visible light catalytic activity; and the preparation method has the advantages of low cost, simple technological process and completion within a short period of time.

Description

technical field [0001] The invention relates to an N-doped nano-TiO 2 The invention relates to a shock wave preparation method thereof, belonging to the technical field of material processing and combination. Background technique [0002] TiO 2 It has the advantages of low cost, non-toxicity, and strong redox ability. When used as a photocatalyst to degrade various refractory pollutants in the environment, it has the characteristics of strong oxidation, safe mineralization of pollutants, and no secondary pollution. However, due to its large forbidden band width, the corresponding intrinsic light absorption is in the ultraviolet region (λ<420nm), which greatly limits the ability of TiO 2 Effective use of solar energy. Therefore, the development of nano-TiO with visible light absorption activity 2 Photocatalysts have important application value for making full use of sunlight to split water cheaply and in large quantities to produce hydrogen and effectively degrade vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/34A62D3/17A62D101/28
Inventor 陈鹏万崔乃夫高翔刘建军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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