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Pollutant treatment method based on friction catalysis of semiconductor powder

A semiconductor and pollutant technology, applied in the field of pollution control, can solve problems such as low efficiency, difficulty in light entry, poor light transmission, etc., and achieve extensive control effects

Inactive Publication Date: 2019-06-07
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is that its energy gap is too large, and it can only absorb ultraviolet rays in sunlight, resulting in very low efficiency.
Another defect is that some aqueous solutions have poor light transmission, it is difficult for light to enter, and the photocatalysis of titanium dioxide is also difficult to occur.
[0003] As for other wide-gap oxide semiconductors, such as nanoparticles of barium strontium titanate and zinc oxide, they have the same defects as titanium dioxide nanoparticles when they are used as photocatalytic materials.
[0004] For those semiconductors with narrow energy gaps, although their nanoparticles can absorb visible light when used as photocatalytic materials, their poor stability often limits their applications. Even if they are used as photocatalytic materials, they still cannot be used in aqueous solutions where light is difficult to enter. pollution control

Method used

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  • Pollutant treatment method based on friction catalysis of semiconductor powder
  • Pollutant treatment method based on friction catalysis of semiconductor powder
  • Pollutant treatment method based on friction catalysis of semiconductor powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The pollutant treatment method based on semiconductor powder friction catalysis provided by the first embodiment includes the following contents:

[0019] Add 30 mg of commercially available photocatalytic material P25 (titanium dioxide nanopowder) into 30 ml of rhodamine B solution (concentration: 5 mg / L), and the volume of the beaker is 50 ml. Add four magnetic stirring bars with Teflon surfaces in the beaker, and perform magnetic stirring at a speed of 300 revolutions per minute. During the shading period, the temperature was kept at 25°C.

[0020] The concentration change of rhodamine B was analyzed by measuring the absorption spectrum. Such as figure 1 As shown, the test results show that after four and a half hours of stirring, the degradation rate of rhodamine B reaches more than 95%.

Embodiment 2

[0022] The pollution control method based on semiconductor powder friction catalysis provided in the second embodiment includes the following contents:

[0023] 23.66 g of Ba(OH) 2 ·8H 2 O with 6.645 g Sr(OH) 2 ·8H 2 O was dissolved in 500 ml of deionized water, kept at 60°C with a water bath, and stirred, and this solution was called solution A. 34.0 g of Ti(OBu) 4 Dissolve in 250 ml of absolute ethanol, and the resulting solution is called solution B. Solution B was slowly dropped into solution A while stirring vigorously. The white precipitate formed was aged for 3 hours, collected by filtration, and baked at 60 °C for 24 hours. Finally, it was calcined at 500°C for 2 hours in a muffle furnace to obtain Ba 0.75 Sr 0.25 TiO 3 (BST) powder.

[0024] Add 40 mg of the above-mentioned BST powder into 30 ml of methyl orange solution (concentration: 5 mg / L), and the volume of the beaker is 50 ml. Add four magnetic stirring bars with Teflon surfaces in the beaker, and pe...

Embodiment 3

[0027] The pollutant treatment method based on semiconductor powder friction catalysis provided by the third embodiment includes the following contents:

[0028] Add 40 mg of commercially available zinc oxide micron powder (Tianjin Kermel Company, 2 micron zinc oxide powder) into 30 ml of rhodamine B solution (concentration is 5 mg / L), and the volume of the beaker is 50 ml. Add four magnetic stirring bars with Teflon surfaces in the beaker, and perform magnetic stirring at a speed of 300 revolutions per minute. During the shading period, the temperature was kept at 25°C.

[0029] The concentration change of rhodamine B was analyzed by measuring the absorption spectrum. The test results show that after three hours of stirring, the degradation rate of rhodamine B reaches more than 95%.

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Abstract

The invention provides a pollutant treatment method based on friction catalysis of semiconductor powder, which is characterized in that the semiconductor powder with friction catalysis performance isadded to a solution containing a pollutant to be treated, and a friction medium is added; then, the friction medium and the semiconductor powder are rubbed with each other by shaking or stirring, so that the semiconductor powder has catalytic effect and the contaminants in the solution are degraded. The method utilizes the frictional catalytic effect of semiconductor powder, the semiconductor powder obtains the energy by friction to generate the excitation of electrons-hole pair, furthermore the contaminants in the solution degrade, and the irradiation of light is not needed in the process, the shortcomings of the photocatalytic materials in the process of contaminant treatment are effectively overcome, and the method can be used for treating the pollutant in a wider range of environments.

Description

technical field [0001] The invention belongs to the technical field of pollution control, and in particular relates to a pollutant control method based on semiconductor powder friction catalysis. technical background [0002] Titanium dioxide nanoparticles are a common photocatalytic material. Under the excitation of light, titanium dioxide can generate electron-hole pairs, which in turn trigger a series of chemical reactions. An important application of titanium dioxide photocatalytic materials is to treat various pollutants in water, and to degrade various pollutants in water under the action of light. However, for this application, titanium dioxide photocatalytic materials still have some important defects. One is that its energy gap is too large, and it can only absorb ultraviolet rays in sunlight, resulting in low efficiency. Another disadvantage is that some aqueous solutions have poor light transmission, and it is difficult for light to enter, and the photocatalysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F101/30
Inventor 陈万平李鹏程
Owner WUHAN UNIV
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