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Preparation method of stainless steel screen load TiO2 nanometer membrane photochemical catalyst

A photocatalyst and stainless steel technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large particle size, quantum efficiency, photocatalytic activity reduction, etc., and achieve low production cost, TiO2 Easy film thickness and high photocatalytic oxidation activity

Inactive Publication Date: 2005-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these TiO 2 Coating material and TiO 2 Compared with powder, it has no secondary pollution and can be reused. TiO 2 A series of advantages such as the formation of a strong bond between the particles and the matrix, but due to the surface coverage of the binder and the nano-TiO 2 Due to the large particle size of the powder (due to polymerization), the TiO 2 The quantum efficiency (i.e., photocatalytic activity) of photocatalysts is greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, take 100ml of absolute ethanol, and slowly add 8.5ml of butyl titanate and 4.8ml of triethanolamine successively under strong stirring at 800-1500 rpm. After the addition is complete, further stir for 10-30min. Then add a mixture of 0.1 g of cerous nitrate, 3.5 g of polyethylene glycol 600, 10 ml of absolute ethanol and 1 ml of water, and continue stirring for 0.5 to 2 hours to obtain a stable, uniform, and transparent sol. The stainless steel wire mesh used is Cr13 stainless steel wire mesh, 20-60 mesh mesh, which is corroded by dilute HCl solution, washed with water and treated at 500-800 °C in air atmosphere to obtain a stainless steel wire mesh substrate with a clean surface and a uniform oxide film.

[0017] Using clean stainless steel wire mesh as the substrate, TiO was prepared from the above sol by dipping and pulling method. 2 Wet film, then dry at 80-120°C for 5-30 minutes, take it out, cool it in the air and repeat the pulling for 3-4 times. The wet f...

Embodiment 2

[0019] The same operation as in Example 1 is used, except that butyl titanate and triethanolamine are pre-mixed and then added to absolute ethanol.

[0020] Finally, some performance indexes of the product are measured, showing that it has the same result as the product obtained in Example 1.

Embodiment 3

[0022] The same operation as in Example 1 was used, except that the water in the mixture of cerous nitrate, polyethylene glycol 600, absolute ethanol and water was removed.

[0023] For the prepared TiO 2 Nanofilm photocatalysts were measured, and scanning electron microscope (SEM) showed that TiO 2 The coating is made of uniform TiO 2 Composed of nanoparticles, the particle size is 20-50nm, TiO 2 There are a large number of nanopores between the particles; the photocatalytic oxidation activity evaluation shows that the conversion rate of formaldehyde is ~100% under the irradiation of ultraviolet light with a gas flow rate of 1.6L / min and a wavelength of 254nm at room temperature.

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Abstract

The preparation process of stainless steel wire net supported nanometer TiO2 film as photocatalyst includes dipping and lifting clean stainless steel wire net in stable titanium alkoxide sol to form wet TiO2 film and drying 80-120 deg.c, repeating the dipping and drying step until reaching the required film thickness, and high temperature treating at 300-600 deg.c to prepare the stainless steel wire net supported nanometer TiO2 film as photocatalyst. The present invention has the features of simple process, low production cost, high coating strength, small TiO2 grains and high photocatalytic activity.

Description

technical field [0001] The present invention relates to the chemical preparation of inorganic and solid materials, especially stainless steel wire mesh loaded TiO 2 Preparation method of nano film photocatalyst. Background technique [0002] Photocatalyst is a key part of the photocatalytic process, and the activity and immobilization of photocatalyst is a decisive factor for the practicality of photocatalytic technology. At present, most of the photocatalysts used in the research of heterogeneous catalysis are nano-TiO 2 n-type semiconductor. TiO 2 The bandgap energy is 3.2ev, which is equivalent to the photon energy with a wavelength of 387.5nm. When TiO 2 When irradiated by ultraviolet light with a wavelength of less than 387.5nm, the electrons in the valence band transition to the conduction band, generating free electrons (e-) and holes (h+), so this nanomaterial has a very strong photocatalytic redox function , can oxidize or decompose various organic compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/06B01J37/02
Inventor 周仁贤陈敏吴法理赵元鹏
Owner ZHEJIANG UNIV
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