CN114106409B - Photothermal conversion material for seawater desalination and preparation method thereof - Google Patents
Photothermal conversion material for seawater desalination and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a photothermal conversion material for seawater desalination, which comprises a water guide layer and a photothermal evaporation film spin-coated on the surface of the water guide layer; the water guide layer is melamine sponge, and the photo-thermal evaporation film is a ZIF-L-based PDA/sodium alginate film. The invention also discloses a preparation method of the photothermal conversion material for seawater desalination, which comprises the following steps: utilizing ZIF-L to induce dopamine to polymerize into polydopamine in situ to obtain ZIF-L/PDA, and mixing the obtained ZIF-L/PDA with sodium alginate to obtain sol; and spin-coating the sol on the surface of the melamine sponge to form a film, and drying to obtain the photothermal conversion material. The photo-thermal evaporation film formed by modifying sodium alginate has wide spectrum absorption and photo-thermal conversion capability in the whole solar spectrum on one hand, and has desalting capability on the other hand, and can effectively avoid the deposition of salt on the surface in the interface evaporation process, so that the photo-thermal evaporation film has stable evaporation performance and does not influence the light absorption and photo-thermal conversion process.
Description
Technical Field
The invention relates to a photothermal conversion material for seawater desalination and a preparation method of the photothermal conversion material.
Background
With the rapid development of economy and the acceleration of industrialization pace worldwide since the 21 st century, energy scarcity and environmental deterioration become major challenges facing the world, and especially in some economic lag areas, fresh water resources are extremely scarce. In recent years, materials and devices applied to interfacial evaporation have attracted great interest to researchers in the fields of seawater desalination, power generation, carbon dioxide capture, heavy metal recovery, steam sterilization, oil-water separation, and the like, by virtue of excellent photothermal conversion efficiency and heat utilization efficiency. Compared with the traditional seawater desalination technology, the only driving force of the interfacial evaporation technology is solar energy with abundant reserves. The photo-thermal material realizes efficient seawater desalination under the drive of solar energy, thereby obtaining safe drinking water.
Currently, there are many types of materials used for solar photothermal evaporation: although the noble metal and the semiconductor material have higher photo-thermal conversion efficiency, the noble metal material is rare and expensive and is difficult to apply on a large scale, meanwhile, the combination of the evaporation interface of the noble metal and the semiconductor photo-thermal evaporation material and the water guide material is a complex process, and the carbon-based material has good development prospect and application space due to the advantages of low cost, richness, excellent light absorption capacity and the like.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a photothermal conversion material for seawater desalination, and the invention also aims to provide a preparation method of the photothermal conversion material.
The technical scheme is as follows: the photo-thermal conversion material for seawater desalination comprises a water guide layer and a photo-thermal evaporation film which is spin-coated on the surface of the water guide layer; the water guide layer is melamine sponge, and the photo-thermal evaporation film is a ZIF-L-based PDA/sodium alginate film.
The density of the photothermal conversion material for seawater desalination is 9kg/m 3 The thickness is 5mm; the thickness of the photo-thermal evaporation film on the melamine sponge is 0.5mm.
The preparation method of the photothermal conversion material for seawater desalination comprises the following steps: utilizing ZIF-L to induce dopamine to polymerize into polydopamine in situ to obtain ZIF-L/PDA, and mixing the obtained ZIF-L/PDA with sodium alginate to obtain sol; and spin-coating the sol on the surface of the melamine sponge to form a film, and drying to obtain the photothermal conversion material.
The preparation method of the photothermal conversion material for seawater desalination specifically comprises the following steps:
(1) Dissolving the prepared foliated two-dimensional ZIF-L in water at room temperature to obtain a ZIF-L solution, adding dopamine hydrochloride into the ZIF-L solution, and reacting to form a ZIF-L/PDA solution;
(2) Adding sodium alginate into the ZIF-L/PDA solution under stirring, and mixing and stirring for 5-8 hours to form sol;
(3) And spin-coating the sol on the surface of the melamine sponge, and then drying the melamine sponge to obtain the photo-thermal conversion material.
In the step (1), the foliated two-dimensional ZIF-L is prepared by the following method: and mixing and stirring the cobalt nitrate solution and the dimethyl imidazole solution, reacting to obtain a precipitate, centrifuging and washing the precipitate, and drying to obtain the foliated two-dimensional ZIF-L. The lamellar two-dimensional ZIF-L has a large specific surface area and can enable the evaporation area of an interface to be larger, the ZIF-L has a catalytic enzyme-like structure and can promote dopamine oxidation in the presence of oxygen, such as air, so that Dopamine (DA) is rapidly polymerized in situ to form Polydopamine (PDA), and the surface of the ZIF-L is wrapped with a polydopamine membrane.
Wherein the mixing volume ratio of the cobalt nitrate solution to the dimethyl imidazole solution is 1:1; the concentration ratio of cobalt nitrate to dimethylimidazole is 1:8.
wherein in the step (1), the concentration of ZIF-L in the ZIF-L solution is 1-9 mg/mL. The concentration of ZIF-L is lower than 1mol/L, the internal structure of the film is loose, the light absorption efficiency is reduced, the photo-thermal conversion process is influenced, the concentration is higher than 9mol/L, the film density is high, pore shrinkage or blockage is further caused, and the diffusion of steam to the environment is inhibited.
In the step (1), the mass ratio of the added dopamine hydrochloride to the ZIF-L is 2:1 to 9.
In the step (2), the mass ratio of the addition amount of sodium alginate to the addition amount of dopamine hydrochloride is 5:2. sodium alginate is used as a film forming agent, and is fully mixed with ZIF-L/PDA to form a layer of compact semi-permeable membrane (permeable and salt-impermeable) on the surface of melamine sponge, so that salt is prevented from accumulating on the upper surface of the membrane in the seawater evaporation process, and is blocked on the lower surface of the membrane. In the ZIF-L/PDA solution added with sodium alginate, the concentration of the sodium alginate is not lower than 2mg/mL and lower than 2mg/mL, so that the film is sparse, the viscosity and the density of the film are reduced, the desalination and the stability (seawater corrosion resistance) of the material are not facilitated, the concentration is not higher than 7mg/mL and higher than 7mg/mL, the material is not facilitated to form the film, the hydrophilicity is poor, and even the hardening is realized.
Wherein, in the step (3), the drying temperature is 55 ℃.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable effects: (1) According to the invention, the melamine sponge is used as the water-conducting layer, so that the melamine sponge has excellent heat-insulating property and abundant pore structures, and can reduce the loss of material heat and improve the photo-thermal conversion efficiency while being used as the water-conducting layer; (2) The photo-thermal evaporation film formed by modifying sodium alginate has wide spectrum absorption and photo-thermal conversion capability in the whole solar spectrum on one hand, and has desalting capability on the other hand, so that the deposition of salt on the surface in the interface evaporation process can be effectively avoided, the photo-thermal evaporation film has stable evaporation performance, and the implementation of the light absorption and photo-thermal conversion process is not influenced; the photothermal conversion material can be applied to the field of seawater desalination, and solves the problem of shortage of fresh water resources.
Drawings
FIG. 1 is a SEM of ZIF-L of example 1;
FIG. 2 is a scanning electron micrograph of ZIF-L/PDA obtained after dopamine was encapsulated in ZIF-L of example 1;
FIG. 3 is a scanning electron micrograph of a film obtained by mixing ZIF-L/PDA of example 1 with sodium alginate;
FIG. 4 is a SEM of a ZIF-L/PDA sponge of example 1;
FIG. 5 is an X-ray diffraction pattern of ZIF-L and ZIF-L/PDA obtained in example 1;
FIG. 6 is a graph of transmission energy of ZIF-L/PDA obtained in example 1;
FIG. 7 is a graph comparing the change in quality of the ZIF-L/PDA photothermal sponge material prepared in example 1 and pure water under simulated sunlight;
FIG. 8 is a graph showing the change in mass of photothermal sponge materials prepared with different concentrations of ZIF-L under simulated sunlight;
FIG. 9 is a graph comparing salt deposition prevention performance of a common black sponge with that of ZIF-L/PDA photothermal sponge prepared in example 1.
Detailed Description
Example 1
The preparation method of the photothermal conversion material for preventing salt deposition comprises the following steps:
(1) At 25 ℃, 2mmol of cobalt nitrate hexahydrate Co (NO) is added 3 ) 2 ·6H 2 Dissolving O in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the cobalt nitrate concentration of 0.05mol/L, and marking as a solution A;
(2) Dissolving 16mmol of dimethyl imidazole in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the concentration of the dimethyl imidazole of 0.4mol/L, wherein the solution is marked as a solution B;
(3) Slowly dripping the solution A into the solution B under magnetic stirring to obtain a purple solution;
(4) Centrifuging and washing the product obtained in the step (3) for three times by water, removing supernatant, taking precipitate, and drying at 50 ℃ overnight to obtain purple powder-ZIF-L;
(5) Dissolving 50mg of the powder obtained in the step (4) in 10mL of deionized water at 25 ℃, and performing ultrasonic treatment for 3-5 minutes to obtain a solution with the ZIF-L concentration of 5mg/mL, wherein the solution is marked as a solution C;
(6) Under magnetic stirring, adding 20mg of dopamine hydrochloride into the solution C, and stirring for 1 hour to obtain a black solution, which is marked as solution D; at the moment, the product in the black solution is ZIF-L/PDA, namely an in-situ polymerized polydopamine film is wrapped on the surface of the ZIF-L;
(7) Under magnetic stirring, adding 50mg of sodium alginate into the solution D, and stirring for 6 hours to obtain black sol;
(8) And (3) cutting the clean melamine sponge, placing the cut melamine sponge in a container, uniformly coating the black sol obtained in the step (7) on the surface by using a dropper, placing the container in a drying oven, and carrying out ventilation drying at 55 ℃ overnight to obtain the photothermal conversion material, namely the ZIF-L/PDA sponge.
The obtained ZIF-L/PDA sponge is subjected to seawater desalination performance analysis, and under the condition of one illumination, the photo-thermal evaporation temperature can reach 39.1 ℃, and the evaporation rate can reachIs 1.34411kg · m -2 ·h -1 The solar steam generation efficiency was 82%.
EDS analysis is carried out on the obtained ZIF-L/PDA, and the ZIF-L/PDA comprises the following elements: c:39.75wt%, N:10.24wt%, co:22.34wt%, O:27.67wt%.
As can be seen from FIGS. 1 to 4, FIG. 1 illustrates a precursor of a foliated ZIF-L; FIG. 2 illustrates that dopamine successfully polymerizes to polydopamine on the ZIF-L surface, while ZIF-L/PDA also exhibits a two-dimensional foliated structure; FIG. 3 illustrates the successful mixing of ZIF-L/PDA with sodium alginate into a membrane; figure 4 illustrates a melamine sponge with a three-dimensional porous structure as the substrate.
FIG. 5 is an X-ray diffraction pattern of ZIF-L/PDA obtained in example 1, and from FIG. 5, it can be seen that the XRD pattern of ZIF-L/PDA obtained in example 1 does not have the characteristic ZIF-L band, but a diffuse reflection peak of amorphous polymer PDA is present, indicating that ZIF-L is coated with PDA.
FIG. 6 is a graph of transmission energy of ZIF-L/PDA obtained in example 1, wherein red indicates C element, orange indicates N element, yellow indicates O element, and green indicates Co element, demonstrating uniform distribution of Co element in ZIF-L, and further demonstrating uniform coating of ZIF-L by PDA.
The ZIF-L/PDA sponge prepared in example 1 was subjected to a photothermal evaporation performance test, and FIG. 7 shows the change in mass of pure water and ZIF-L/PDA sponge within 1 hour of one-time solar irradiation, and it can be seen from FIG. 7 that the evaporation amounts per unit time of pure water and ZIF-L/PDA sponge of example 1 were 0.22426 kg. M. -2 、1.34411kg·m -2 As can be seen from FIG. 7, the photothermal evaporation performance of the ZIF-L/PDA sponge obtained in example 1 is far superior to that of water, thus demonstrating that the ZIF-L/PDA sponge of the present invention has excellent photothermal seawater evaporation performance.
FIG. 9 is a graph showing a comparison of salt deposition on the surface of the ZIF-L/PDA sponge of example 1 and a normal black sponge, in which salt deposition has occurred on the surface of the normal black sponge within 4 hours under one illumination intensity, but no salt deposition is observed on the surface of the ZIF-L/PDA sponge, thus demonstrating that the ZIF-L/PDA sponge has superior salt deposition prevention properties.
Example 2
The preparation method of the photothermal conversion material for preventing salt deposition comprises the following steps:
(1) At 25 ℃, 2mmol of cobalt nitrate hexahydrate Co (NO) is added 3 ) 2 ·6H 2 Dissolving O in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the cobalt nitrate concentration of 0.05mol/L, and marking as a solution A;
(2) Dissolving 16mmol of dimethyl imidazole in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the concentration of the dimethyl imidazole of 0.4mol/L, wherein the solution is marked as a solution B;
(3) Slowly dripping the solution A into the solution B under magnetic stirring to obtain a purple solution;
(4) Centrifuging and washing the product obtained in the step (3) for three times by water, removing supernatant, taking precipitate, and drying at 50 ℃ overnight to obtain purple powder-ZIF-L;
(5) Dissolving 30mg of the powder obtained in the step (4) in 10mL of deionized water at 25 ℃, and performing ultrasonic treatment for 3-5 minutes to obtain a solution with the ZIF-L concentration of 3mg/mL, wherein the solution is marked as a solution C;
(6) Under magnetic stirring, adding 20mg of dopamine hydrochloride into the solution C, and stirring for 1 hour to obtain a black solution, which is recorded as a solution D; at the moment, the product in the black solution is ZIF-L/PDA, namely an in-situ polymerized polydopamine film is wrapped on the surface of the ZIF-L;
(7) Under magnetic stirring, adding 50mg of sodium alginate into the solution D, and stirring for 6 hours to obtain black sol;
(8) And (4) cutting clean melamine sponge, placing the cut melamine sponge into a container, uniformly coating the black sol obtained in the step (7) on the surface by using a dropper, placing the container into a drying oven, and carrying out ventilation drying at 55 ℃ overnight to obtain the photothermal conversion material, namely the ZIF-L/PDA sponge.
The obtained ZIF-L/PDA sponge is subjected to seawater desalination performance analysis, and under the condition of one illumination, the photo-thermal evaporation temperature can reach 38.2 ℃, and the evaporation rate is 1.09419kg m -2 ·h -1 The solar steam generation efficiency was 65.48%.
Example 3
The preparation method of the photothermal conversion material for preventing salt deposition comprises the following steps:
(1) At 25 ℃, mixing2mmol cobalt nitrate hexahydrate Co (NO) 3 ) 2 ·6H 2 Dissolving O in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the cobalt nitrate concentration of 0.05mol/L, and marking as a solution A;
(2) Dissolving 16mmol of dimethyl imidazole in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the concentration of the dimethyl imidazole of 0.4mol/L, wherein the solution is marked as a solution B;
(3) Slowly dripping the solution A into the solution B under magnetic stirring to obtain a purple solution;
(4) Centrifuging and washing the product obtained in the step (3) for three times by water, removing supernatant, taking precipitate, and drying overnight at 50 ℃ to obtain purple powder-ZIF-L;
(5) Dissolving 10mg of the powder obtained in the step (4) in 10mL of deionized water at 25 ℃, and carrying out ultrasonic treatment for 3-5 minutes to obtain a solution with the ZIF-L concentration of 1mg/mL, which is marked as a solution C;
(6) Under magnetic stirring, adding 20mg of dopamine hydrochloride into the solution C, and stirring for 1 hour to obtain a black solution, which is marked as solution D; at the moment, the product in the black solution is ZIF-L/PDA, namely an in-situ polymerized polydopamine film is wrapped on the surface of the ZIF-L;
(7) Under magnetic stirring, adding 50mg of sodium alginate into the solution D, and stirring for 6 hours to obtain black sol;
(8) And (4) cutting clean melamine sponge, placing the cut melamine sponge into a container, uniformly coating the black sol obtained in the step (7) on the surface by using a dropper, placing the container into a drying oven, and carrying out ventilation drying at 55 ℃ overnight to obtain the photothermal conversion material, namely the ZIF-L/PDA sponge.
The obtained ZIF-L/PDA sponge is subjected to seawater desalination performance analysis, and under a light condition, the photothermal evaporation temperature can reach 36 ℃, and the evaporation rate is 1.04943kg m -2 ·h -1 The solar steam generation efficiency is 60.6%.
Example 4
The preparation method of the photothermal conversion material for preventing salt deposition comprises the following steps:
(1) At 25 ℃, 2mmol of cobalt nitrate hexahydrate Co (NO) 3 ) 2 ·6H 2 Dissolving O in 40mL of deionized waterObtaining a solution with the cobalt nitrate concentration of 0.05mol/L by sound for 3-5 min, and marking as a solution A;
(2) Dissolving 16mmol of dimethyl imidazole in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the concentration of the dimethyl imidazole of 0.4mol/L, wherein the solution is marked as a solution B;
(3) Slowly dripping the solution A into the solution B under magnetic stirring to obtain a purple solution;
(4) Centrifuging and washing the product obtained in the step (3) for three times by water, removing supernatant, taking precipitate, and drying at 50 ℃ overnight to obtain purple powder-ZIF-L;
(5) Dissolving 70mg of the powder obtained in the step (4) in 10mL of deionized water at 25 ℃, and performing ultrasonic treatment for 3-5 minutes to obtain a solution with the ZIF-L concentration of 7mg/mL, wherein the solution is marked as a solution C;
(6) Under magnetic stirring, adding 20mg of dopamine hydrochloride into the solution C, and stirring for 1 hour to obtain a black solution, which is recorded as a solution D; at the moment, the product in the black solution is ZIF-L/PDA, namely, an in-situ polymerized polydopamine film is wrapped on the surface of the ZIF-L;
(7) Under magnetic stirring, adding 50mg of sodium alginate into the solution D, and stirring for 6 hours to obtain black sol;
(8) And (3) cutting the clean melamine sponge, placing the cut melamine sponge in a container, uniformly coating the black sol obtained in the step (7) on the surface by using a dropper, placing the container in a drying oven, and carrying out ventilation drying at 55 ℃ overnight to obtain the photothermal conversion material, namely the ZIF-L/PDA sponge.
The obtained ZIF-L/PDA sponge is subjected to seawater desalination performance analysis, and under the condition of one illumination, the photo-thermal evaporation temperature can reach 39.5 ℃, and the evaporation rate is 1.1775 kg-m -2 ·h -1 The solar steam generation efficiency was 70.05%.
Example 5
The preparation method of the photothermal conversion material for preventing salt deposition comprises the following steps:
(1) At 25 ℃, 2mmol of cobalt nitrate hexahydrate Co (NO) is added 3 ) 2 ·6H 2 Dissolving O in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the cobalt nitrate concentration of 0.05mol/L, and marking as a solution A;
(2) Dissolving 16mmol of dimethyl imidazole in 40mL of deionized water, and carrying out ultrasonic treatment for 3-5 min to obtain a solution with the concentration of the dimethyl imidazole of 0.4mol/L, wherein the solution is marked as a solution B;
(3) Slowly dripping the solution A into the solution B under magnetic stirring to obtain a purple solution;
(4) Centrifuging and washing the product obtained in the step (3) for three times by water, removing supernatant, taking precipitate, and drying at 50 ℃ overnight to obtain purple powder-ZIF-L;
(5) Dissolving 90mg of the powder obtained in the step (4) in 10mL of deionized water at 25 ℃, and performing ultrasonic treatment for 3-5 minutes to obtain a solution with the ZIF-L concentration of 9mg/mL, wherein the solution is marked as a solution C;
(6) Under magnetic stirring, adding 20mg of dopamine hydrochloride into the solution C, and stirring for 1 hour to obtain a black solution, which is recorded as a solution D; at the moment, the product in the black solution is ZIF-L/PDA, namely, an in-situ polymerized polydopamine film is wrapped on the surface of the ZIF-L;
(7) Under magnetic stirring, adding 50mg of sodium alginate into the solution D, and stirring for 6 hours to obtain black sol;
(8) And (4) cutting clean melamine sponge, placing the cut melamine sponge into a container, uniformly coating the black sol obtained in the step (7) on the surface by using a dropper, placing the container into a drying oven, and carrying out ventilation drying at 55 ℃ overnight to obtain the photothermal conversion material, namely the ZIF-L/PDA sponge.
The obtained ZIF-L/PDA sponge is subjected to seawater desalination performance analysis, and under the condition of one light, the photothermal evaporation temperature can reach 37.6 ℃, and the evaporation rate is 1.03326kg m -2 ·h -1 The solar steam generation efficiency is 58.68%.
The ZIF-L/PDA sponge has good light absorption and photo-thermal conversion capability on an evaporation interface, which is beneficial to generating local high temperature and promoting the evaporation of water, and a film formed by modifying sodium alginate is beneficial to preventing salt from accumulating on the surface in the seawater evaporation process, so that the light absorption and evaporation performance are prevented from being influenced.
As can be seen from fig. 8, when the concentration of ZIF-L is lower than 1mol/L, the internal structure of the film is loose, which results in a decrease in light absorption efficiency and an influence on the photothermal conversion process, and when the concentration of ZIF-L is higher than 9mol/L, the film density is high, which further results in pore shrinkage or clogging, and inhibits the diffusion of vapor to the environment. The performances of the photothermal material are related to the ZIF-L concentration, and 5mg/mL is the best, as demonstrated by comparing parameters such as evaporation rate, solar steam generation efficiency, and temperature in examples 1-5.
Claims (8)
1. A photothermal conversion material for seawater desalination is characterized in that: the photo-thermal evaporation film comprises a water guide layer and a photo-thermal evaporation film which is spin-coated on the surface of the water guide layer; the water guide layer is melamine sponge, and the photo-thermal evaporation film is a ZIF-L-based PDA/sodium alginate film;
the photothermal conversion material for seawater desalination is prepared by the following method: inducing dopamine to polymerize in situ to form polydopamine by using foliated two-dimensional ZIF-L to obtain ZIF-L/PDA, wherein the foliated two-dimensional ZIF-L has a catalytic enzyme-like structure and promotes the oxidation of dopamine in the presence of oxygen, so that the dopamine is rapidly polymerized in situ to form polydopamine, and the surface of the ZIF-L is wrapped with a polydopamine film; mixing the obtained ZIF-L/PDA with sodium alginate to obtain sol; spin coating the sol on the surface of melamine sponge to form a film, and drying to obtain a photo-thermal conversion material; sodium alginate as a film forming agent is fully mixed with ZIF-L/PDA to form a layer of compact water-permeable and salt-impermeable semipermeable membrane on the surface of the melamine sponge; the foliated two-dimensional ZIF-L is prepared by the following method: and mixing and stirring the cobalt nitrate solution and the dimethyl imidazole solution, reacting to obtain a precipitate, centrifuging and washing the precipitate, and drying to obtain the foliated two-dimensional ZIF-L.
2. The photothermal conversion material for seawater desalination according to claim 1, wherein: the thickness ratio of the thickness of the melamine sponge to the thickness of the photothermal evaporation film is 10:1.
3. the photothermal conversion material for seawater desalination according to claim 1, comprising the following steps:
(1) Dissolving the prepared foliated two-dimensional ZIF-L in water at room temperature to obtain a ZIF-L solution, adding dopamine hydrochloride into the ZIF-L solution, and reacting to form a ZIF-L/PDA solution;
(2) Adding sodium alginate into the ZIF-L/PDA solution under stirring, and mixing and stirring for 5 to 8 hours to form sol;
(3) And spin-coating the sol on the surface of the melamine sponge, and then drying the melamine sponge to obtain the photo-thermal conversion material.
4. The photothermal conversion material for seawater desalination according to claim 1, wherein: the mixing volume ratio of the cobalt nitrate solution to the dimethyl imidazole solution is 1:1; the concentration ratio of the cobalt nitrate to the dimethyl imidazole is 1:8.
5. the photothermal conversion material for sea water desalination according to claim 3, wherein: in the step (1), the concentration of the ZIF-L in the ZIF-L solution is 1 to 9mg/mL.
6. The photothermal conversion material for sea water desalination according to claim 3, wherein: in the step (1), the mass ratio of the added dopamine hydrochloride to the ZIF-L is 2:1 to 9.
7. The photothermal conversion material for seawater desalination according to claim 3, wherein: in the step (2), the mass ratio of the addition amount of the sodium alginate to the addition amount of the dopamine hydrochloride is 5:2.
8. the photothermal conversion material for sea water desalination according to claim 3, wherein: in the step (3), the drying temperature was 55 ℃.
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| CN115260611B (en) * | 2022-06-17 | 2023-06-09 | 中国科学院青岛生物能源与过程研究所 | Degradable bio-based foam material with high photo-thermal conversion efficiency and preparation and application thereof |
| CN115093679B (en) * | 2022-06-20 | 2023-04-25 | 郑州大学 | PBAT porous sponge and preparation method and application thereof |
| CN115558473A (en) * | 2022-08-11 | 2023-01-03 | 武汉纺织大学 | Zone-limited water type high-efficiency photo-thermal evaporation material and device |
| CN115403092A (en) * | 2022-08-24 | 2022-11-29 | 浙江理工大学 | Floating ball for continuously evaporating solar seawater through photo-thermal conversion and application |
| CN115974209A (en) * | 2022-12-28 | 2023-04-18 | 中国科学技术大学 | Interface photothermal evaporator loaded with photocatalyst and application thereof |
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