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Porous graphene film prepared by laser processing method, preparation method and application thereof

A laser processing method, porous graphene technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve problems that do not meet the concept of green development, high condition requirements, cannot be removed, etc., and achieve high reusability , strong adaptability and easy storage

Pending Publication Date: 2020-05-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of heating seawater to boil and vaporize it, and then condensing it into fresh water is called distillation, which is the most widely used, but distillation requires a large amount of heat source, is expensive, and has a certain impact on the environment, which does not conform to our green development concept; The method of accelerating the dialysis speed by applying an electric field on both sides of the liquid with different concentrations is called electrodialysis, which can only remove electrolyte ions in water, but cannot remove uncharged particles; while reverse osmosis requires high Seawater reverse osmosis membranes with excellent properties such as desalination rate, corrosion resistance, high pressure resistance, and anti-pollution require higher conditions

Method used

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  • Porous graphene film prepared by laser processing method, preparation method and application thereof
  • Porous graphene film prepared by laser processing method, preparation method and application thereof
  • Porous graphene film prepared by laser processing method, preparation method and application thereof

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Embodiment 1

[0031] The small commercial laser engraving machine used in the present invention is a diode laser, and any power within 0-3W can be obtained by adjusting parameters, and it can be considered accurate within a certain error range. The polyimide film is purchased from DuPont, and the specific model is Kapton The color is light yellow, and the specific thickness is 0.0125-0.025mm, which can be considered accurate within a certain error range.

[0032] A preparation method of a porous graphene film prepared by a laser processing method, the specific steps are as follows:

[0033](1) Using laser processing technology to induce porous graphene film: cut the 0.025mm thick polyimide film into a square with a size of 20mm*20mm, and reserve a square double-sided processable area with an area of ​​15mm*15mm, here Cutting devices include but are not limited to scissors and the like. Then use a fixing device to fix the film on a flat substrate of 50mm*50mm*5mm. Here, the fixing device...

Embodiment 2

[0037] Such as Figure 5 Shown, a kind of application of the porous graphene film that utilizes the laser processing method to prepare in seawater desalination, specifically, will get two bottle mouth diameters and be the round mouth container of 5-10mm as seawater storage device and fresh water storage device, will The porous graphene material film prepared by the present invention is cut into a circle with a diameter of 5-10 mm, placed on the water surface with a seawater storage device, completely covering the water surface, and at the same time, a condensing device inclined from the seawater storage device to the fresh water storage device is added above the container. device, the condensing device is a 60mm*60mm*5mm glass plate, and the temperature of the condensing device is kept at 10-15°C; under the action of solar energy, the porous graphene film is placed on the surface of the liquid water, and the porous graphene film converts light energy into heat energy. The liqu...

Embodiment 3

[0040] The present invention also provides the application of using the porous graphene material for an evaporative humidifier, that is, the porous graphene film is used to convert light energy into heat energy, and the liquid water around the porous graphene film is evaporated, thereby increasing the environmental humidity, and Ensure that the water vapor released by the humidifier is clean, and avoid bringing bacteria and impurities in the water into the air during the humidification process of the traditional ultrasonic water mist humidifier.

[0041] Such as Image 6 As shown, the application of a porous graphene film prepared by laser processing method in the evaporative humidifier device, the processed film is cut according to the square area of ​​5mm*5mm to form a graphene film array, and placed in the humidifier water injection area and completely submerged in water. Depend on Image 6 It can be seen that in the evaporative humidifier, the graphene array is completel...

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Abstract

The invention discloses a porous graphene film prepared by a laser processing method, and a preparation method and application thereof, and belongs to the technical field of material preparation. Thelaser processing method is utilized to process a polyimide film material, the polyimide material is subjected to high-temperature decomposition through photothermal effect of laser to prepare the laser-induced graphene (LIG), and meanwhile, gas escapes in the reaction process so that the prepared LIG has a porous structure. The porous structure of the LIG is favorable for reflecting incident sunlight for multiple times, so that the optical path is increased, and the absorptivity of the sunlight is improved. After LIG is subjected to oxygen plasma treatment, the surface of LIG is more hydrophilic, and the LIG can be in full contact with liquid water. Besides, the LIG is benefited from a porous structure, high light absorption rate and good photothermal conversion capability, and the film can be used for a solar seawater desalination device to desalinate seawater. The film can also be used for an evaporative humidifier to improve the environment humidity.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a porous graphene film prepared by a laser processing method, a preparation method and an application thereof. Background technique [0002] Water is the basic element of life. Although 71% of the earth's surface is water, fresh water resources only account for 3.5% of the global total. Most seawater is undrinkable due to its high salinity, so desalination of seawater is a key issue we need to study at present, and it provides a long-term solution for the sustainable development of our country and the world. At present, there are many methods for desalination of seawater, and the main methods used are distillation, reverse osmosis, and electrodialysis. The method of heating seawater to boil and vaporize it, and then condensing it into fresh water is called distillation, which is the most widely used, but distillation requires a large amount of heat sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194
CPCC01B32/184C01B32/194
Inventor 张永来李纪超韩冬冬孙洪波
Owner JILIN UNIV
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