CN110510690B - Porous photo-thermal film with salt precipitation resistance and preparation and application thereof - Google Patents
Porous photo-thermal film with salt precipitation resistance and preparation and application thereof Download PDFInfo
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Abstract
The invention discloses a porous photo-thermal film with salt precipitation resistance, and preparation and application thereof2a/Ti porous membrane, and then TiN with plasma resonance effect is loaded on the surface of the titanium mesh through desalination reactionxImproving the light absorptivity, and then obtaining the hydrophobic TiN by hydrophobic modificationxThe Ti porous photo-thermal film prevents salt from being separated out in the seawater desalination process. For TiO of the invention2Nitriding Ti porous film by adopting nitriding measure to obtain TiNxthe/Ti porous film has good light absorption performance, but has poor hydrophobicity, and is resistant to TiNxThe Ti porous membrane is subjected to hydrophobic modification, so that the stability is improved, and the precipitation of salt is planned.
Description
Technical Field
The invention relates to the field of solar seawater desalination, in particular to a porous photo-thermal film with salt precipitation resistance, and preparation and application thereof. The porous photothermal film disclosed by the invention utilizes an interface photothermal conversion technology, can realize high-efficiency light absorption and effectively prevent salt from being separated out in a water evaporation process, and improves the water evaporation efficiency and stability of the porous photothermal film.
Background
Depletion of drinking water resources and deterioration of sanitary conditions are one of the serious challenges facing worldwide mankind. With the continuous deepening of the concept of green sharing development, as an important supply and storage of 'open sources', seawater desalination has become an important way for solving the global water resource crisis. However, the conventional seawater desalination technology has limited its wide use due to its expensive manufacturing and operating costs and environmental pollution caused by high energy consumption. The solar seawater desalination takes sunlight as an energy source, and is an important development direction of environment-friendly, low-energy-consumption and low-cost technology.
The interface photothermal conversion technology greatly improves the light utilization rate by utilizing the air-water interface photothermal steam technology with the porous photothermal membrane with good light absorption and photothermal conversion capacity, thereby improving the water evaporation efficiency. Patent application No.: 201811139989.9 discloses a self-floating flexible carbon-based photothermal conversion film and a preparation method and application thereof, the method comprises the steps of mixing a carbon-based material, a film substrate and polyvinylpyrrolidone to obtain mixed powder, dissolving the mixed powder in an organic solvent to obtain a casting film liquid, and performing spin coating or blade coating on a panel to obtain the porous photothermal conversion film. The carbon-based photothermal conversion film fully utilizes cheap and easily-obtained carbon-based materials, and realizes efficient photothermal conversion. Patent application No.: CN201811288437.4 discloses a porous photothermal membrane with antibacterial property and preparation and application thereof, wherein a uniformly dispersed CNT aqueous solution is prepared by polyethyleneimine PEI, and the solution is vacuum filtered on the surface of a mixed cellulose ester MCE filter membrane to form a self-floating double-layer porous photothermal membrane, and the membrane has high interfacial water evaporation efficiency and rapid evaporation rate. Patent application No.: CN201810796973.9 discloses an attapulgite-based photo-thermal conversion film and a preparation method and application thereof. The attapulgite is doped into the polymer as a crosslinking point, and is subjected to reaction polymerization, freeze drying and further carbonization to obtain the attapulgite/carbon composite membrane material. The prepared porous photothermal film has a large water vapor transport channel and a large light absorption area, can efficiently convert solar energy, and improves the water evaporation rate. Patent application No.: 2016102886410 discloses a multifunctional nano composite sewage purification film and its preparation method and application. The method comprises the steps of selecting a micro-nano film with a certain porous structure as a substrate material, then depositing a photo-thermal evaporation film with photo-thermal conversion characteristics on the substrate, and then depositing a catalytic degradation film with catalytic degradation performance, so that the overall conversion rate and the utilization rate of sunlight are improved, and the sewage purification efficiency can be greatly improved.
The invention can obtain high sunlight-heat energy conversion efficiency through reasonable design of the light absorption material and the film structure in the photo-thermal film, and realize more efficient water evaporation performance. However, in practical applications, salt is continuously separated out during the evaporation process of seawater, so that the steam channel is blocked, the evaporation rate is reduced, and the structure of the photo-thermal film is damaged, so that the long-term circulation stability of the photo-thermal film is affected, which is also a problem that is often neglected. Therefore, there is an urgent need to develop a photothermal film material having salt precipitation resistance, and to improve the water evaporation efficiency and stability of the photothermal film.
The titanium net has strong corrosion resistance, and is mainly used for sieving and filtering under acid and alkali environmental conditions or gas and liquid filtering and other medium separation. The titanium mesh can be applied to high-temperature-resistant filter screens, ship manufacturing, military industry manufacturing, chemical filter screens, mechanical filter cores, electromagnetic shielding screens and seawater desalination filter screens. The existing published patent titanium mesh is mainly used for the photoelectrocatalysis technology of environmental protection sewage treatment, for example, the Chinese patent application No. 201811533172.X discloses a preparation method of a titanium oxide film electrode based on the titanium mesh, and a high vacuum direct current magnetron sputtering method is mainly adopted to generate a titanium oxide film on the surface of the titanium mesh. The Chinese patent application No. 201410572952.0 discloses a visible light photocatalytic material and its preparation method, the technique is to get TiO through anodic oxidation of titanium net2Photocatalytic film of nanotubes, then on TiO2WO with visible light response on nano-tube photocatalytic film through electrodeposition3A photocatalytic film. Although the invention can be used as a photothermal film for seawater desalination, the light absorption efficiency is low because TiO2 has wide energy gap and can only absorb ultraviolet light, and the addition of WO3 can expand the visible light absorption range, but the ultraviolet light and the visible light only account for about 50% of the whole solar spectrum.
In the invention, TiNx with plasma resonance effect is used as a light absorber, corrosion-resistant Ti nets with different apertures are used as a support, and hydrophobic modification is carried out to obtain the hydrophobic membrane with the hierarchical pore structure, so that the light absorption range is hopefully widened, and the photo-thermal conversion performance and stability are improvedxApplication of photothermal film to solar seawater desalinationAnd (5) research of chemosynthesis.
Disclosure of Invention
In order to simultaneously improve the photothermal conversion performance and stability of the seawater desalination material, the invention provides a porous photothermal film with salt precipitation resistance.
The invention also provides a preparation method and application of the material.
In order to achieve the purpose, the invention adopts the technical scheme that:
a porous photo-thermal film with salt precipitation resistance is characterized in that a seawater corrosion resistant metal Ti net with different apertures is used as a substrate material, and TiO with different apertures is obtained by hydrothermal synthesis reaction and reaction time control2a/Ti porous membrane, and then TiN with plasma resonance effect is loaded on the surface of the titanium mesh through desalination reactionxImproving the light absorptivity, and then obtaining the hydrophobic TiN by hydrophobic modificationxThe Ti porous photo-thermal film prevents salt from being separated out in the seawater desalination process.
The porous photothermal film with salt precipitation resistance can be prepared by the following preparation method:
the first step is as follows: substrate treatment
Respectively performing ultrasonic treatment on Ti nets with different pore sizes (10-400 meshes) in acetone, alcohol and deionized water for 30 min;
the second step is that: TiO22Preparation of/Ti porous membranes
The Ti net treated in the steps is put into 10M NaOH solution, the hydrothermal synthesis reaction is carried out at the temperature of 120-180 ℃ for 2-12h, and then TiO with different apertures is obtained through ion exchange and annealing treatment2A porous Ti film; in this process, titanium reacts with NaOH to form Na2Ti3O7Then obtaining H by ion exchange2Ti3O7Annealing to obtain the sheet TiO loaded on the titanium mesh2：
Further, the method comprises the following steps of; the ion exchanger is 0.1-1M hydrochloric acid.
Further: the annealing temperature is 500 ℃, the annealing time is 30min, and the heating rate is 2 ℃ min-1。
The third step: TiN (titanium nitride)xPreparation of/Ti porous membranes
TiO prepared by the steps2Nitriding the/Ti porous membrane at the temperature of 700-1000 ℃ to obtain TiNxThe nitriding treatment time of the/Ti porous membrane is 7-10h, and the working gas is NH3Air flow rate of 10 ml/min-1；
The fourth step: hydrophobic modification
TiN with different apertures prepared by the stepsxthe/Ti porous membrane is hydrophobically modified with silane.
Further: the silane is 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (C10H4Cl3F17 Si).
Further, the specific hydrophobic modification method comprises the following steps: first, a 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (C10H4Cl3F17Si) hydrolysis solution was prepared, then a modification solution consisting of 0.5 Vol% acetic acid, 2.0 Vol% C10H4Cl3F17Si and 97.5 Vol% isopropyl alcohol was prepared, and then the prepared porous membrane was immersed in the modification solution for 10 min.
TiN with salt precipitation resistancexThe application method of the/Ti porous membrane in the solar seawater desalination comprises the following steps:
TiN prepared by the stepsxthe/Ti porous membrane is used as a light absorption layer, the foam wrapping the filter paper and the cotton at the bottom are used as a heat insulation layer and a water supply layer, the finally integrated light absorber is used for carrying out a seawater desalination experiment through a built simulated seawater desalination device, and the method mainly comprises the steps of obtaining water vapor by an interface heating mode and obtaining fresh water through condensation.
Compared with the prior art, the invention has the following advantages:
(1) the invention selects Ti nets with different apertures as substrate materials, has low density, high strength and corrosion resistance, and can provide a channel for water vapor evaporation.
(2) The invention takes titanium net as a substrate, and obtains TiO with different apertures by hydrothermal reaction, ion exchange and annealing treatment, and controlling the temperature and time, especially the time, of the hydrothermal reaction in the process2Porous film of/Ti, however TiO2The porous film of/Ti has poor light absorption property and is used for increasing TiO2Light absorption Properties of/Ti porous films on TiO2Nitriding Ti porous film by adopting nitriding measure to obtain TiNxthe/Ti porous film has good light absorption performance, but has poor hydrophobicity, and is resistant to TiNxThe Ti porous membrane is subjected to hydrophobic modification, so that the stability is improved, and the precipitation of salt is planned.
(3) The invention selects TiNxAs a material for photothermal conversion, TiNxThe nano material has the advantages of low price, high thermal stability, simple preparation process and the like except that the surface plasma resonance characteristic can be compared favorably with that of Au.
(4) The sunlight seawater desalination absorber of the invention is composed of hydrophobic TiNxThe porous Ti photothermal film and the thermal insulation layer foam are integrated with filter paper and cotton for supplying water, so that the porous Ti photothermal film has high light absorption performance and interfacial water evaporation efficiency, can prevent salt from being separated out, improves the cycle stability and the service life of the absorber, and is easier to popularize and apply. The preparation method of the porous photothermal membrane has strong operability, wide raw material sources, higher photothermal conversion performance and good circulation stability.
The finally synthesized porous membrane with a hierarchical pore structure has micropores determined by the pore diameter of the titanium mesh and nanopores prepared by preparing TiO2The heat preservation time of the/Ti porous membrane is controlled within the range of 100-600nm, the final light absorption rate and the water evaporation efficiency can reach more than 90%, and the stability is strong.
Drawings
FIG. 1 is XRD patterns of the TiNx/Ti porous membrane before and after being hydrophobic in the first example, wherein (a) the pattern is the TiNx/Ti porous membrane before being hydrophobic, and (b) the pattern is the XRD pattern of the TiNx/Ti porous membrane after being hydrophobic
FIGS. 2a and 2b are SEM images of the TiNx/Ti porous membrane at 100 times and 20000 times, respectively, in the first example;
FIG. 3 is a graph of light absorption before and after the TiNx/Ti porous membrane is hydrophobic in example one, in which (a) the graph is the light absorption curve of the TiNx/Ti porous membrane before the hydrophobicity and (b) the graph is the light absorption curve of the TiNx/Ti porous membrane after the hydrophobicity
FIG. 4 is a graph showing the effect of evaporating water by the TiNx/Ti porous membrane and seawater before and after the water-repellent treatment in example I.
Detailed Description
The technical scheme of the invention is further explained by combining the embodiment according to the attached drawings.
Example one
The first step is as follows: substrate treatment
Respectively performing ultrasonic treatment on a 100-mesh Ti net (4cm by 4cm, and cutting according to requirement) in acetone, alcohol and deionized water for 30min to remove impurities on the surface.
The second step is that: TiO22Preparation of/Ti porous membranes
Placing the Ti net processed in the above steps into 10M NaOH solution, keeping the temperature at 120 ℃ for 12h to perform hydrothermal synthesis reaction, then performing ion exchange in 1M HCl solution for 10min, finally performing annealing treatment at 500 ℃ for 0.5h, wherein the heating rate is 2 ℃ per min-1To finally obtain TiO2the/Ti hierarchical pore structure photo-thermal film has 150um micropores and 600nm nanopores.
The third step: TiN (titanium nitride)xPreparation of/Ti porous membranes
TiO prepared by the steps2Nitriding of/Ti porous film at 1000 deg.C to obtain TiNxA porous Ti film. The treatment time is 7h, and the working gas is NH3Air flow rate of 10 ml/min-1。
The fourth step: hydrophobic modification
TiN prepared by the stepsxthe/Ti porous membrane is subjected to hydrophobic modification by using perfluorodecyl trichlorosilane, and hydrophobic TiN shown in figure 2 is obtainedxA porous Ti film.
The above modification solution consisted of 0.5 Vol% acetic acid, 2.0 Vol% 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (C10H4Cl3F17Si) and 97.5 Vol% isopropanol for 10 min.
The fifth step: application of solar energy in seawater desalination
The polytetrafluoroethylene tube is used as a container for seawater, so that external energy is effectively prevented from being transferred to the seawater. The upper layer of the light absorber is hydrophobic TiN prepared by the stepsxThe bottom of the Ti photo-thermal film is polystyrene foam wrapping filter paper, and the bottom of the foam is connected with cotton. The absorber has excellent light absorption performance, the light absorption rate reaches more than 90%, as shown in figure 3, moisture can be continuously transported to the surface, and interface light vapor is realizedAnd (4) transformation. Then, the light absorber was placed in a polytetrafluoroethylene tube containing seawater, and on a precision electronic balance using a solar simulator at 1kw · cm-2And (5) irradiating, and recording the change of the water evaporation quality in real time along with the increase of the illumination time. As seen from FIG. 4, the prepared hydrophobic TiNx/Ti photothermal film has good seawater evaporation promoting performance. No salt was precipitated after a long period of irradiation as compared with the unmodified photothermal film, as shown in fig. 4. If the desalinated seawater is collected, the steam is condensed and then can be collected.
Example two
The first step is as follows: substrate treatment
Respectively performing ultrasonic treatment on a 50-mesh Ti net (4cm by 4cm, and cutting according to requirement) in acetone, alcohol, and deionized water for 30min to remove impurities on the surface.
The second step is that: TiO22Preparation of/Ti porous membranes
Placing the Ti net processed in the above steps into 10M NaOH solution, keeping the temperature at 120 ℃ for 2h to perform hydrothermal synthesis reaction, then performing ion exchange in 1M HCl solution for 10min, finally performing annealing treatment at 500 ℃ for 0.5h, wherein the heating rate is 2 ℃ per min-1To finally obtain TiO2the/Ti hierarchical pore structure photo-thermal film has 270um micropores and 200nm nanopores.
The third step: TiN (titanium nitride)xPreparation of/Ti porous membranes
TiO prepared by the steps2Nitriding of/Ti porous film at 1000 deg.C to obtain TiNxA porous Ti film. The treatment time is 7h, and the working gas is NH3Air flow rate of 10 ml/min-1。
The fourth step: hydrophobic modification
TiN prepared by the stepsxthe/Ti porous membrane was hydrophobically modified with perfluorodecyl trichlorosilane as shown in FIG. 2.
The fifth step: application of solar energy in seawater desalination
The polytetrafluoroethylene tube is used as a container for seawater, so that external energy is effectively prevented from being transferred to the seawater. The upper layer of the light absorber is hydrophobic TiN prepared by the stepsxA Ti photo-thermal film, the bottom of which is polystyrene wrapped with filter paperAlkene foam, the foam bottom is connected with cotton. The absorber not only has excellent light absorption performance, but also can continuously transport moisture to the surface, and realize interface light vapor conversion. Then, the light absorber was placed in a polytetrafluoroethylene tube containing seawater, and on a precision electronic balance using a solar simulator at 1kw · cm-2And (5) irradiating, and recording the change of the water evaporation quality in real time along with the increase of the illumination time. If the desalinated seawater is collected, the steam is condensed and then can be collected.
EXAMPLE III
The first step is as follows: substrate treatment
Respectively performing ultrasonic treatment on a 200-mesh Ti net (4cm by 4cm, and cutting according to requirement) in acetone, alcohol, and deionized water for 30min to remove impurities on the surface.
The second step is that: TiO22Preparation of/Ti porous membranes
Placing the Ti net processed in the above steps into 10M NaOH solution, keeping the temperature at 120 ℃ for 6h to perform hydrothermal synthesis reaction, then performing ion exchange in 1M HCl solution for 10min, finally performing annealing treatment at 500 ℃ for 0.5h, wherein the heating rate is 2 ℃ per min-1To finally obtain TiO2the/Ti hierarchical pore structure photo-thermal film has 75um micropores and about 200-300nm nanopores.
The third step: TiN (titanium nitride)xPreparation of/Ti porous membranes
TiO prepared by the steps2nitriding/Ti porous membrane at 800 ℃ to obtain TiNxA porous Ti film. The treatment time is 10h, and the working gas is NH3Air flow rate of 10 ml/min-1。
The fourth step: hydrophobic modification
TiN prepared by the stepsxthe/Ti porous membrane was hydrophobically modified with perfluorodecyl trichlorosilane as shown in FIG. 2.
The fifth step: application of solar energy in seawater desalination
The polytetrafluoroethylene tube is used as a container for seawater, so that external energy is effectively prevented from being transferred to the seawater. The upper layer of the light absorber is hydrophobic TiN prepared by the stepsxA Ti photo-thermal film, the bottom of which is polystyrene foam wrapping filter paper, and the bottom of the foam is connected with cotton. The absorber not only has excellent light absorption performance, but also can continuously transport moisture to the surface, and realize interface light vapor conversion. Then, the light absorber was placed in a polytetrafluoroethylene tube containing seawater, and on a precision electronic balance using a solar simulator at 1kw · cm-2And (5) irradiating, and recording the change of the water evaporation quality in real time along with the increase of the illumination time. If the desalinated seawater is collected, the desalinated seawater can be collected through steam condensation.
Example four
The first step is as follows: substrate treatment
Respectively performing ultrasonic treatment on a 300-mesh Ti net (4cm by 4cm, and cutting according to requirements) in acetone, alcohol and deionized water for 30min to remove impurities on the surface.
The second step is that: TiO22Preparation of/Ti porous membranes
Placing the Ti net processed in the above steps into 10M NaOH solution, keeping the temperature at 180 ℃ for 6h to perform hydrothermal synthesis reaction, then performing ion exchange in 1M HCl solution for 10min, finally performing annealing treatment at 500 ℃ for 0.5h, wherein the heating rate is 2 ℃ per min-1To finally obtain TiO2the/Ti hierarchical pore structure photo-thermal film has micropores of 48 microns and nanopores of about 300-400 nm.
The third step: TiN (titanium nitride)xPreparation of/Ti porous membranes
TiO prepared by the steps2nitriding/Ti porous membrane at 800 ℃ to obtain TiNxA porous Ti film. The treatment time is 7h, and the working gas is NH3Air flow rate of 10 ml/min-1。
The fourth step: hydrophobic modification
TiN prepared by the stepsxthe/Ti porous membrane was hydrophobically modified with perfluorodecyl trichlorosilane as shown in FIG. 2.
The fifth step: application of solar energy in seawater desalination
The polytetrafluoroethylene tube is used as a container for seawater, so that external energy is effectively prevented from being transferred to the seawater. The upper layer of the light absorber is hydrophobic TiN prepared by the stepsxThe bottom of the Ti photo-thermal film is polystyrene foam wrapping filter paper, and the bottom of the foam is connected with cotton. The absorber not only has excellent light absorptionThe performance is good, and the moisture can be continuously transported to the surface, so that the interface light vapor conversion is realized. Then, the light absorber was placed in a polytetrafluoroethylene tube containing seawater, and on a precision electronic balance using a solar simulator at 1kw · cm-2And (5) irradiating, and recording the change of the water evaporation quality in real time along with the increase of the illumination time. If the desalinated seawater is collected, the steam is condensed and then can be collected.
From the comparison of the two patterns in fig. 1, it can be seen that the TiNx/Ti porous membrane is successfully synthesized, and the hydrophobic modification does not change the composition of the membrane.
As can be seen from the SEM picture of FIG. 2a, the synthesized TiNxThe nano-sheets are uniformly covered on the micro-pore titanium mesh to form the TiNx/Ti photothermal membrane, and the appearance of the TiNx growth is a porous structure as can be seen from the SEM picture of figure 2b, the pore diameter is about 500-600nm, and finally the hierarchical pore structure photothermal membrane consisting of the micro-pore structure and the nano-pore structure is obtained.
From the light absorption graph of fig. 3, it can be seen that the light absorption range of the synthesized TiNx/Ti porous membrane is the whole solar spectrum, the light absorption rate of the TiNx/Ti porous membrane before hydrophobic is 75%, and the light absorption rate can be improved to 92% after hydrophobic.
From the water evaporation effect graph given in fig. 4, it can be seen that the water evaporation rate of the hydrophobic TiNx/Ti porous membrane is fastest, and the efficiency can reach 90%. In addition, as can be seen from the inset, after the surface of the hydrophobic TiNx/Ti porous membrane is irradiated by light for 12 hours, no salt is precipitated on the surface, which shows that the salt precipitation is prevented after the hydrophobic modification, and the stability of the porous membrane is improved.
Claims (6)
1. A preparation method of a porous photo-thermal film with salt precipitation resistance is characterized in that a seawater corrosion resistant metal Ti net with different apertures is used as a substrate material, and TiO with different apertures is obtained by hydrothermal synthesis reaction and reaction time control2a/Ti porous film, then loading TiN with plasma resonance effect on the surface of the titanium net through nitridation reactionxImproving the light absorptivity, and then obtaining the hydrophobic TiN by hydrophobic modificationxThe Ti porous photothermal film prevents salt from being separated out in the seawater desalination process, and specifically comprises the following steps：
The first step is as follows: substrate treatment
Respectively performing ultrasonic treatment on a Ti net with the aperture size of 10-400 meshes in acetone, alcohol and deionized water for 30 min;
the second step is that: TiO22Preparation of/Ti porous membranes
The Ti net treated in the above steps is put into 10M NaOH solution at 120-180-oKeeping the temperature for 2-12h under C to carry out hydrothermal synthesis reaction, and then obtaining TiO with different apertures through ion exchange and annealing treatment2A porous Ti film; in this process, titanium reacts with NaOH to form Na2Ti3O7Then obtaining H by ion exchange2Ti3O7Annealing to obtain the sheet TiO loaded on the titanium mesh2：
The third step: TiN (titanium nitride)xPreparation of/Ti porous membranes
TiO prepared by the steps2The porous film of/Ti is 700-1000-oNitriding under C to obtain TiNxThe nitriding treatment time of the/Ti porous membrane is 7-10h, and the working gas is NH3Air flow rate of 10 ml/min-1；
The fourth step: hydrophobic modification
TiN with different apertures prepared by the stepsxthe/Ti porous membrane is hydrophobically modified with silane.
2. The method of claim 1, wherein the ion exchanger is 0.1 to 1M hydrochloric acid.
3. The method of claim 1, wherein the annealing temperature of the annealing step is 500 degrees centigrade oC, annealing time of 30min, and heating rate of 2oC·min-1。
4. The method of claim 1 wherein the silane is 1H, 2H-perfluorodecyltrichlorosilane.
5. The method for preparing a porous photothermal film with salt precipitation resistance according to claim 1, wherein the specific hydrophobic modification method is: first, a 1H, 1H, 2H, 2H-perfluorodecyl trichlorosilane hydrolysis solution was prepared, then a modified solution consisting of 0.5 Vol% acetic acid, 2.0 Vol% 1H, 1H, 2H, 2H-perfluorodecyl trichlorosilane, and 97.5 Vol% isopropyl alcohol was prepared, and then the prepared porous membrane was immersed in the modified solution for 10 min.
6. A method for using a porous photothermal film produced by the method for producing a porous photothermal film having a salt precipitation resistance according to claim 1, wherein TiN is added during usexthe/Ti porous membrane is used as a light absorption layer, the foam wrapping the filter paper and the cotton at the bottom are used as a heat insulation layer and a water supply layer, the finally integrated light absorber is used for carrying out a seawater desalination experiment through a built simulated seawater desalination device, and the method mainly comprises the steps of obtaining water vapor by an interface heating mode and obtaining fresh water through condensation.
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