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Titanium dioxide photonic crystal film for photocatalytic degradation of organic matters

A photonic crystal and titanium dioxide technology, applied in the field of photocatalysis, can solve the problems of difficult control of film structure and thickness, poor process controllability, and complicated preparation process, so as to improve catalytic activity and energy utilization efficiency, low production cost, and preparation method simple effect

Inactive Publication Date: 2013-10-02
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods often have disadvantages such as poor performance stability, complicated preparation process, high production cost, poor process controllability, difficult control of film structure and thickness, and few practical applications.

Method used

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  • Titanium dioxide photonic crystal film for photocatalytic degradation of organic matters
  • Titanium dioxide photonic crystal film for photocatalytic degradation of organic matters
  • Titanium dioxide photonic crystal film for photocatalytic degradation of organic matters

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Using a suspension of monodisperse polystyrene microspheres with a diameter of 100 nm and ethanol as a dispersant, polystyrene microspheres with an ordered structure were deposited on the surface of quartz glass hydrophilically treated with sodium hydroxide solution through a vertical deposition assembly process at room temperature. Layers of spheres are deposited, forming opal-structured film templates. After the template is formed, place it in an oven at 80°C and sinter for 1 hour to improve the strength of the template during post-processing. Add ethanol first, then butyl titanate, stir evenly, then add deionized water to mix butyl titanate, absolute ethanol and deionized water in a certain molecular ratio (1:100:5), and stir at room temperature until a transparent sol is formed. The obtained opal structure film template was vertically immersed in the sol, and the sol was fully penetrated into the template by the action of capillary force. After standing for 5 minut...

Embodiment 2

[0022] The preparation method of the titanium dioxide inverse opal photonic crystal film is the same as in Example 1, except that the monodisperse polystyrene microsphere suspension with a diameter of 200 nm is vertically deposited to prepare the opal structure film template.

[0023] Using the obtained inverse opal structure porous titanium dioxide photonic crystal film with a pore diameter of 200 nm as a photocatalyst, the method of Example 1 was used to photocatalytically degrade phenanthrene, and the 8-hour degradation rate of phenanthrene was measured to be 90.0%. Photocatalytic experiments prove that the photocatalytic degradation rate constant of this film (taking phenanthrene as an example) is 2.1 times that of the amorphous nano-TiO2 film.

Embodiment 3

[0025] The preparation method of the titanium dioxide inverse opal photonic crystal film is the same as in Example 1, except that the monodisperse polystyrene microsphere suspension with a diameter of 300 nm is vertically deposited to prepare the opal structure film template.

[0026] Using the obtained inverse opal structured porous titanium dioxide photonic crystal film with a pore size of 300 nm as a photocatalyst, the photocatalytic degradation of phenanthrene was carried out according to the method in Example 1, and the 8-hour degradation rate of phenanthrene was measured to be 84.6%. The photocatalytic experiment proves that the photocatalytic degradation rate constant of this film (taking phenanthrene as an example) is 1.8 times that of the amorphous nano-TiO2 film.

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Abstract

The invention provides a titanium dioxide photonic crystal film for removing organic pollutants in the environment by photocatalytic degradation and a preparation method thereof, and belongs to the technical field of photocatalysis. In the invention, a film with a polystyrene opal structure is used as a template, sol is prepared by using tetrabutyl titanate, absolute ethanol and deionized water according to a certain molecular ratio of 1:100:5, the polystyrene template is repeatedly dip-coated with sol and sintered, and finally calcining is performed at a high temperature of 450 DEG C to remove the polystyrene template, and thus, the three-dimensional ordered porous titanium dioxide photonic crystal film with an inverse opal structure is obtained. The obtained titanium dioxide photonic crystal film has the characteristics of controllable film structure, high catalytic activity, high light utilization rate and simple preparation method and can realize high-efficiency removal of organic pollutants.

Description

technical field [0001] The invention belongs to the technical scope of photocatalysis, and in particular relates to a titanium dioxide photonic crystal film which can be used for photocatalytic degradation and removal of organic pollutants in the environment and a preparation method thereof. Background technique [0002] Since 1972, Fujishima and Honda have published the use of semiconductor metal oxide titanium dioxide (TiO 2 ) Since the experimental results of photolysis of water, the work of light-excited semiconductor materials to decompose and mineralize organic pollutants has received extensive attention and research, and it is expected to develop into a green catalytic technology that directly uses solar energy to degrade toxic and harmful pollutants. The preparation of semiconductor materials used as photocatalysts is the core technology of photocatalytic oxidation. Common semiconductor photocatalysts are mainly n-type semiconductors such as metal oxides and metal su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06A61L9/18A61L101/02
Inventor 陈静庄玲萍息摇宏包月平
Owner BEIJING NORMAL UNIVERSITY
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