Preparation method and application of silver oxide/titanium dioxide composite nanofiber photocatalyst

A technology of composite nanofibers and titanium dioxide, applied in the field of environmental pollution control, can solve the problems of difficult to meet long-term catalytic requirements, difficult to settle, difficult to separate and recycle, etc., to improve the separable and reusable performance, the preparation method is simple, and the operation is simple. Ease of the process

Inactive Publication Date: 2014-03-05
CHANGCHUN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] However, the commonly obtained titanium dioxide-based compound semiconductor material is a nano-powder. When it is used in a liquid phase system, the smaller nanoparticles are suspended in the solution and are not easy to settle, and it is difficult to separate and recover, which is not conducive to recycling. In addition, The stability of the composite catalyst is poor, the crystal growth is difficult, the particle size and loading are not easy to control, and it is difficult to meet the long-term catalytic requirements, which affects and limits its practical application in industrial production.

Method used

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  • Preparation method and application of silver oxide/titanium dioxide composite nanofiber photocatalyst
  • Preparation method and application of silver oxide/titanium dioxide composite nanofiber photocatalyst
  • Preparation method and application of silver oxide/titanium dioxide composite nanofiber photocatalyst

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Experimental program
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Embodiment 1

[0039] Dissolve polyvinylpyrrolidone (PVP, Mn=1300000) in 7ml of absolute ethanol; then dissolve 1.5ml of glacial acetic acid and 1ml of butyl titanate in 3ml of absolute ethanol; then mix the above two solutions to prepare titanium The n-butyl titanate-PVP solution is used to prepare the n-butyl titanate-PVP composite nanofibers by electrospinning; then the composite nanofibers are calcined at a high temperature at 530°C to obtain titanium dioxide nanofibers. The scanning electron microscope (SEM) photos of the prepared titanium dioxide nanofibers are as follows figure 1 Shown. It can be clearly seen from the figure that the average diameter of titanium dioxide nanofibers is 100-200 nm, and the fiber length is tens of microns, which has a large aspect ratio. The titanium dioxide nanofibers prepared above were immersed in 25 mL of 0.04 mol / L ammonia solution for 30 minutes, and then 25 mL of 0.02 mol / L silver nitrate solution was added dropwise, and magnetically stirred for 10 ...

Embodiment 2

[0041] According to the preparation method of the present invention in Example 1, except that the ammonia solution, silver salt solution and alkali solution are respectively replaced with 0.2mol / L ammonia, 0.1mol / L silver acetate and 0.2mol / L sodium hydroxide, Silver oxide / titanium dioxide composite nanofiber photocatalyst.

Embodiment 3

[0043] According to the preparation method of the present invention in Example 1, except that the ammonia solution, the silver salt solution and the alkali solution are respectively replaced with 0.4mol / L ammonia, 0.2mol / L silver acetate and 0.4mol / L sodium hydroxide, Silver oxide / titanium dioxide composite nanofiber photocatalyst.

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Abstract

The invention relates to a preparation method and application of a silver oxide / titanium dioxide composite nanofiber photocatalyst, belonging to the technical field of environment pollution control. The catalyst takes a silver oxide nanostructure as a catalytic active component material and titanium dioxide nanofiber as a carrier material. Through modifying the surface of titanium dioxide by the silver oxide, not only is the separation efficiency of a titanium dioxide photoproduction electron-hole pair increased, but also the light absorption range of the titanium dioxide is expanded to a visible light region, thus the photocatalytic degradation efficiency of the titanium dioxide to organic pollutants is increased. Silver oxide nanoparticles on the surface of the catalyst prepared by the invention are uniform in distribution, relatively small in particle size and controllable in component content; moreover, the composite catalyst is high in catalytic activity and stability, easy to separate, recover and recycle, relatively high in practical value and relatively wide in application prospect.

Description

Technical field [0001] The invention belongs to the technical field of environmental pollution control, and particularly relates to a method for preparing a silver oxide / titanium dioxide composite nanofiber photocatalyst and its application to the composite nanofiber photocatalyst. Background technique [0002] With the development of global society and economy, environmental problems have become more and more serious. Among them, organic pollution in water bodies has seriously endangered human health. At present, people have carried out extensive research on the degradation of organic pollutants by semiconductor photocatalysts. Among them, the most representative semiconductor titanium dioxide has the advantages of safety, non-toxic side effects, stable physical and chemical properties, not easy to be corroded by light, low cost, no secondary pollution, etc., and has achieved great results in the photocatalytic degradation of toxic pollutants in water. Of great concern, many ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J35/06A62D3/17A62D101/28
Inventor 苏春彦王承学王树江胡江磊
Owner CHANGCHUN UNIV OF TECH
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