CN116874011A - Light evaporation device based on interface light steam conversion and application method thereof - Google Patents
Light evaporation device based on interface light steam conversion and application method thereof Download PDFInfo
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- CN116874011A CN116874011A CN202310554482.4A CN202310554482A CN116874011A CN 116874011 A CN116874011 A CN 116874011A CN 202310554482 A CN202310554482 A CN 202310554482A CN 116874011 A CN116874011 A CN 116874011A
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- 238000001704 evaporation Methods 0.000 title claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 71
- 230000008020 evaporation Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000000463 material Substances 0.000 claims abstract description 50
- 239000013505 freshwater Substances 0.000 claims abstract description 37
- 239000011521 glass Substances 0.000 claims abstract description 33
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000017 hydrogel Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- 238000001879 gelation Methods 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 3
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 238000009834 vaporization Methods 0.000 claims 3
- 230000008016 vaporization Effects 0.000 claims 3
- 230000007704 transition Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Abstract
The application provides a light evaporation device based on interface light steam conversion, which comprises a water inlet tank, a light evaporation chamber and a fresh water tank, wherein the light evaporation chamber comprises a hemispherical glass cover, an annular evaporation cavity, an interface light steam conversion material and a heat insulation water delivery sponge, the annular evaporation cavity is connected with the water inlet tank, and the hemispherical glass cover is arranged above the annular evaporation cavity and is connected with the fresh water tank; the interface light steam conversion material, the heat-insulating water delivery sponge and the hemispherical glass cover are arranged between the annular evaporation cavity and the hemispherical glass cover, and the heat-insulating water delivery sponge is arranged below the interface light steam conversion material so as to absorb water in the annular evaporation cavity into the interface light steam conversion material. The application also provides a use method of the light evaporation device based on the interface light steam conversion. The device can effectively improve the light evaporation efficiency and has a simple structure.
Description
Technical Field
The application relates to the technical field of photo-thermal evaporation, in particular to a photo-evaporation device based on interface photo-vapor conversion and a use method thereof.
Background
Up to now, there have been many possible techniques for sea water desalination, such as reverse osmosis, electrodialysis, etc. However, most of the technologies used require a large amount of electric energy or chemical energy for desalination, and not only consume a large amount of energy, but also pollute the environment, and the yield is low. Based on the method, the seawater is desalted by utilizing the renewable solar energy resources with abundant reserves, so that the clean water production with environmental protection, low cost and no extra power input is realized. With the deep research, a plurality of students find that the evaporation efficiency can be greatly improved by means of the photo-thermal conversion material, and the photo-thermal conversion material has good anti-fouling capability and purification performance, so that an interface photo-vapor conversion technology is developed, and the technology has great potential in the field of sustainable production water treatment.
At present, the interface light-steam conversion technology has lower recovery yield of evaporated water in the actual application process, because the evaporation rate of the whole light-heat conversion material can be influenced along with the continuous change of the solar altitude in the actual application process; and the distillation device commonly used in the field of interface light steam is mostly used by one-time evaporation, and the device needs to be opened to repeatedly add water after the water is distilled, so that the operation efficiency is low, and the operation sustainability of the whole system of the device is not facilitated.
Disclosure of Invention
The application discloses a light evaporation device based on interface light steam conversion, which has a simple structure and convenient operation, and aims to solve the problem that the existing interface light steam conversion technology has lower recovery yield of evaporated water in the actual application process.
The application adopts the following scheme:
the application provides a light evaporation device based on interface light steam conversion, which comprises a water inlet tank, a light evaporation chamber and a fresh water tank, wherein the light evaporation chamber comprises a hemispherical glass cover, an annular evaporation cavity, an interface light steam conversion material and a heat insulation water delivery sponge, the annular evaporation cavity is connected with the water inlet tank, and the hemispherical glass cover is arranged above the annular evaporation cavity and is connected with the fresh water tank; the interface light steam conversion material and the heat-insulating water delivery sponge are arranged between the annular evaporation cavity and the hemispherical glass cover, and the heat-insulating water delivery sponge is arranged below the interface light steam conversion material so as to absorb water in the annular evaporation cavity into the interface light steam conversion material.
Further, the interface light-to-vapor converting material is laterally surrounded by a reflective mirror surface adapted to reflect light to a lateral region of the interface light-to-vapor converting material.
Further, the hemispherical glass cover is made of quartz glass.
Further, the interface light steam conversion material is hydrogel.
Further, the thickness of the hydrogel is 3-5 cm.
Further, the heat-insulating water-conveying sponge is polyurethane sponge.
Further, the thickness of the heat-insulating water delivery sponge is 5-6 cm.
Further, the fresh water tank is disposed between the water inlet tank and the annular evaporation cavity, and is connected with the hemispherical glass cover, so that fresh water condensed from the hemispherical glass cover enters the fresh water tank.
The application also provides a use method of the light evaporation device based on the interface light steam conversion, which comprises the following steps:
s1: at 23-40 ℃, water is input from the inlet of the water inlet tank, and water is conveyed into the annular evaporation cavity through the outlet of the water inlet tank until the water inlet tank is full;
s2: sunlight is injected into the device through a hemispherical glass cover at the top of the device and irradiates on the surface of the interface light-steam conversion material; part of sunlight is gathered to the side surface of the interface light steam conversion material carried on the heat-insulating water delivery sponge through the reflecting mirror surface, the water body in the annular evaporation cavity is absorbed by the interface light steam conversion material through the heat-insulating water delivery sponge and heated and evaporated to generate steam, the steam is gathered to the hemispherical glass cover at the top, condensed into fresh water under the condensation action of the hemispherical glass cover, and slides into the fresh water tank under the action of gravity;
s3: the treated water body is discharged through the water outlet of the fresh water tank.
Further, the interface light steam conversion material is graphite-based hydrogel, and the preparation process comprises the following steps:
1. graphite powder, acrylamide, N' -methylene bisacrylamide and water are mixed according to the mass ratio of 7:6:0.5:25 is put into a stainless steel barrel and is pulped for 10 minutes by stirring;
2. then adding a surfactant, and stirring rapidly to foam the mixture to obtain foam-stable slurry;
3. after foaming stabilization, stirring is continued and 2 parts of N, N, N ', N' -tetramethyl ethylenediamine is added as a catalyst, and after 10min, 7 parts of persulfate aqueous solution (10 wt%) is added as an initiator for initiating the gelation reaction;
4. stopping stirring, and standing for a moment to obtain the graphite-based hydrogel.
The beneficial effects are that:
(1) The device realizes the efficient coupling of the solar condensation heat collection technology and the interface light steam conversion technology, gathers the sunlight which is incident into the annular evaporation cavity in a larger area to the side surface of the interface light steam conversion material and the back surface of the interface light steam conversion material which is not irradiated by the sunlight by adopting the reflecting mirror surface, and meanwhile, the heat insulation water delivery sponge at the lower part plays the roles of supporting material and heat insulation, so that the heat loss in the light-heat conversion process is avoided, the solar energy utilization rate is improved, and the evaporation rate is further improved.
(2) In the evaporation process, besides the photo-thermal material absorbs sunlight to perform photo-thermal conversion, the water in the water inlet tank is further improved in water temperature under the condition of sunlight radiation, so that the thermal mass transfer efficiency of the device is greatly improved.
(3) The device can perform continuous evaporation, has the characteristics of high operation efficiency, compact structure, simple maintenance and long service life, has high water purification efficiency, wide application range and low treatment cost, and has long service life and easy storage of the interface light steam conversion material.
Drawings
FIG. 1 is a schematic diagram of a light evaporation device based on interface light vapor conversion according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another structure of a light evaporation device based on interface light vapor conversion according to an embodiment of the present application;
FIG. 3 is a graph of real-time data of solar intensity and water temperature of an external environment using an optical evaporation device based on interfacial light vapor conversion according to an embodiment of the present application;
icon: a water inlet tank inlet 1; a hemispherical glass cover 2; an annular evaporation chamber 3; a heat-insulating water-transporting sponge 4; an interface light-vapor converting material 5; a reflecting mirror surface 6; a stage 7; a fresh water tank 8; a water outlet switch 9; a water inlet tank 10; a water inlet tank outlet 11; a water inlet gap 12.
Detailed Description
Examples
Referring to fig. 1 to 2, an embodiment of the present application provides a light evaporation device based on interfacial light steam conversion, which includes a water inlet tank 10, a light evaporation chamber and a fresh water tank 8, wherein the light evaporation chamber includes a hemispherical glass cover 2, an annular evaporation cavity 3, interfacial light steam conversion material 5 and a heat insulation water delivery sponge 4, the annular evaporation cavity 3 is connected with the water inlet tank 10, and the hemispherical glass cover 2 is disposed above the annular evaporation cavity 3 and is connected with the fresh water tank 8; the interface light steam conversion material 5 and the heat-insulating water delivery sponge 4 are arranged between the annular evaporation cavity 3 and the hemispherical glass cover 2, and the heat-insulating water delivery sponge 4 is arranged below the interface light steam conversion material 5 so as to absorb water in the annular evaporation cavity 3 into the interface light steam conversion material 5.
As shown in fig. 1, in the present embodiment, the water inlet tank 10 is provided with a water inlet tank inlet 1 for water inlet, and a water inlet tank outlet 11 may be provided at the bottom to communicate with the annular evaporation chamber 3, so as to convey water into the annular evaporation chamber 3, and the fresh water tank 8 is provided between the annular evaporation chamber 3 and the water inlet tank 10, for receiving the evaporated and condensed fresh water. The water inlet tank 10, the annular evaporation cavity 3 and the fresh water tank 8 in the embodiment can be all arranged in a circular ring shape, and a ring-in-ring structure is adopted, so that the structure of the whole device is more compact. The fresh water tank 8 is provided with a water outlet switch 9 for discharging fresh water from the water outlet switch 9. The water inlet tank 10, the main body of the annular evaporation cavity 3 and the fresh water tank 8 can be made of acrylic materials, and the water inlet tank 10 is an outermost annular water tank; the inlet tank inlets 1 can be provided with two, the inlet tank outlets 11 can be provided with four, so that rapid water inlet and water outlet are facilitated, and the inlet tank outlets 11 are positioned on an outer ring partition plate at the bottom of the fresh water tank 8. In an embodiment, the main body of the annular evaporation cavity 3 may be configured in a convex shape, the convex portion is a hollow cylinder, and the water inlet tank 10 and the fresh water tank 8 are annular water tanks that can be sleeved on the cylinder, so that the installation is convenient, and the structure is compact.
In an embodiment, the interface light-to-steam converting material 5 is laterally surrounded by a reflective mirror surface 6, said reflective mirror surface 6 being adapted to reflect light to a lateral region of said interface light-to-steam converting material 5. The mirror surface is fixedly supported by a carrier 7, which can be fixedly placed on the carrier 7. In this embodiment, the reflection angle of the reflecting mirror surface is about 45 ° to 75 °, preferably 60 °, and the convergence effect is optimal. The reflecting mirror surfaces 6 are provided with a plurality of reflecting mirror surfaces 6, the reflecting mirror surfaces 6 are in an arc shape, and the spacing ring is arranged on the outer peripheral side of the interface light steam conversion material 5 and used for reflecting and converging sunlight to the side edge area and the bottom area of the interface light steam conversion material 5, so that the irradiation area is increased, the light conversion effect is improved, and the evaporation efficiency is improved. The reflecting mirror surfaces 6 adopt front coating reflecting mirrors with high reflectivity, water inlet gaps 12 are arranged between the adjacent reflecting mirror surfaces 6, and the water inlet gaps 12 are suitable for the fresh water condensed by the hemispherical glass cover 2 to flow into the fresh water tank 8.
In this embodiment, the hemispherical glass cover 2 is made of quartz glass, and the bottom of the inner wall of the hemispherical glass cover 2 is connected with the fresh water tank 8, so that fresh water condensed on the inner wall of the hemispherical glass cover 2 can slide into the fresh water tank 8 along the inner wall.
The interfacial light vapor converting material 5 is a hydrogel. Specifically, the interfacial light vapor conversion material 5 is graphite-based hydrogel, and the preparation process specifically comprises the following steps:
1. graphite powder, acrylamide, N' -methylene bisacrylamide and water are mixed according to the mass ratio of 7:6:0.5:25 is put into a stainless steel barrel and is pulped for 10 minutes by stirring;
2. then adding a surfactant, and stirring rapidly to foam the mixture to obtain foam-stable slurry; the surfactant can be sodium dodecyl sulfate, and the weight of the surfactant is about 0.08 part;
3. after foaming stabilization, stirring is continued and 2 parts of N, N, N ', N' -tetramethyl ethylenediamine is added as a catalyst, and after 10min, 7 parts of persulfate aqueous solution (10 wt%) is added as an initiator for initiating the gelation reaction;
4. stopping stirring, and standing for a moment to obtain the graphite-based hydrogel.
The interface light steam conversion material 5 has a thickness of 3-5 cm, which can obtain a large conversion efficiency.
The polyurethane sponge is adopted as the heat-insulating water delivery sponge 4 in the embodiment, the thickness of the polyurethane sponge is 5-6 cm, the water delivery efficiency can be ensured, and the heat-insulating effect is achieved.
The application also provides a use method of the light evaporation device based on the interface light steam conversion, which comprises the following steps:
s1: at the temperature of 23-40 ℃, water is input from the inlet 1 of the water inlet tank, the water body is conveyed into the annular evaporation cavity 3 through the outlet 11 of the water inlet tank, and when the water inlet tank 10 is full;
s2: sunlight is made to enter the inside of the device through the hemispherical glass cover 2 at the top of the device and irradiates the surface of the interface light-steam conversion material 5; part of sunlight is gathered to the side surface of the interface light steam conversion material 5 carried on the heat-insulating water delivery sponge 4 through the reflecting mirror surface 6, the water body in the annular evaporation cavity 3 is absorbed by the interface light steam conversion material 5 through the heat-insulating water delivery sponge 4 and heated and evaporated to generate steam, the steam is gathered to the hemispherical glass cover 2 at the top, and the steam slides into the fresh water tank 8 under the action of condensation of the hemispherical glass cover 2;
s3: the treated water body is discharged through the water outlet of the fresh water tank 8.
As shown in FIG. 3, when the real-time data of sunlight intensity and water temperature of the external environment are recorded, the fresh water yield of the device can reach 11.32L/m from seven am half to four pm half 2 . The device has the advantages of continuous evaporation, high operation efficiency, compact structure, simple maintenance, long service life, high water purification efficiency, wide application range, low treatment cost, long service life of the interface light steam conversion material and easy storage.
It should be understood that: the above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above examples, and all technical solutions belonging to the concept of the present application belong to the protection scope of the present application.
The description of the drawings in the embodiments above illustrates only certain embodiments of the application and should not be taken as limiting the scope, since other related drawings may be made by those of ordinary skill in the art without the benefit of the inventive faculty.
Claims (10)
1. The light evaporation device based on interface light steam conversion comprises a water inlet tank, a light evaporation chamber and a fresh water tank, and is characterized in that the light evaporation chamber comprises a hemispherical glass cover, an annular evaporation cavity, an interface light steam conversion material and a heat insulation water delivery sponge, wherein the annular evaporation cavity is connected with the water inlet tank, and the hemispherical glass cover is arranged above the annular evaporation cavity and is connected with the fresh water tank; the interface light steam conversion material and the heat-insulating water delivery sponge are arranged between the annular evaporation cavity and the hemispherical glass cover, and the heat-insulating water delivery sponge is arranged below the interface light steam conversion material so as to absorb water in the annular evaporation cavity into the interface light steam conversion material.
2. The light-evaporating device based on interface light-vapor conversion as recited in claim 1, wherein the side edge of the interface light-vapor conversion material is provided with a reflecting mirror surface.
3. The light-evaporating device based on interface light-vapor conversion of claim 1 wherein said hemispherical glass cover is made of quartz glass.
4. The light-vapor converting light-vapor generating device of claim 1, wherein said interfacial light-vapor converting material is a hydrogel.
5. The light-evaporating device based on interfacial light-vapor conversion as recited in claim 4, wherein said hydrogel has a thickness of 3-5 cm.
6. The light-evaporating device based on interface light-vapor conversion of claim 1 wherein the heat-insulating water-transporting sponge is a polyurethane sponge.
7. The light-evaporating device based on interface light-vapor conversion of claim 6, wherein the thickness of the heat-insulating water-transporting sponge is 5-6 cm.
8. The interfacial light vapor transition-based light vaporization device of claim 1 wherein the fresh water tank is disposed between the inlet tank and the annular vaporization chamber and is connected to the hemispherical glass enclosure such that fresh water condensed from the hemispherical glass enclosure enters the fresh water tank.
9. The method of using an interfacial light vapor transfer based light vaporization apparatus according to any one of claims 2 to 8 comprising the steps of:
s1: at 23-40 ℃, water is input from the inlet of the water inlet tank, and water is conveyed into the annular evaporation cavity through the outlet of the water inlet tank until the water inlet tank is full;
s2: sunlight is injected into the device through a hemispherical glass cover at the top of the device and irradiates on the surface of the interface light-steam conversion material; part of sunlight is gathered to the side surface of the interface light steam conversion material carried on the heat-insulating water delivery sponge through the reflecting mirror surface, the water body in the annular evaporation cavity is absorbed by the interface light steam conversion material through the heat-insulating water delivery sponge and heated and evaporated to generate steam, the steam is gathered to the hemispherical glass cover at the top, condensed into fresh water under the condensation action of the hemispherical glass cover, and slides into the fresh water tank under the action of gravity;
s3: the treated water body is discharged through the water outlet of the fresh water tank.
10. The method for using the light evaporation device based on interface light steam conversion according to claim 9, wherein the interface light steam conversion material is graphite-based hydrogel, and the preparation process is specifically carried out according to the following steps:
1. graphite powder, acrylamide, N' -methylene bisacrylamide and water are mixed according to the mass ratio of 7:6:0.5:25 is put into a stainless steel barrel and is pulped for 10 minutes by stirring;
2. then adding a surfactant, and stirring rapidly to foam the mixture to obtain foam-stable slurry;
3. after foaming stabilization, stirring is continued and 2 parts of N, N, N ', N' -tetramethyl ethylenediamine is added as a catalyst, and after 10min, 7 parts of persulfate aqueous solution (10 wt%) is added as an initiator for initiating the gelation reaction;
4. stopping stirring, and standing for a moment to obtain the graphite-based hydrogel.
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