Bimetal organic framework derivative evaporator with efficient photo-thermal conversion and preparation method and application of bimetal organic framework derivative evaporator

Abstract

The invention relates to an efficient photo-thermal conversion bimetallic organic framework derivative evaporator and a preparation method and application thereof.The preparation method comprises the steps that 1, two metal salts and ligands are weighed according to the stoichiometric ratio and dissolved in a solvent, stirring is conducted to form a uniform mixed solution, the mixed solution is centrifuged, washed and dried, and bimetallic MOF is obtained; step 2, putting the bimetal MOF into a tubular furnace to be calcined, so as to obtain carbonized bimetal MOF; step 3, mixing and stirring a cross-linking agent, water and the carbonized bimetallic MOF to form slurry; and step 4, soaking the three-dimensional porous matrix in the slurry for cross-linking, and then drying to obtain the double-metal organic framework derivative evaporator. The invention has the characteristics of simple preparation process, high evaporation efficiency of the evaporator, high mechanical stability, good chemical stability, low cost, simple preparation and convenient recovery.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment materials, and specifically relates to a bimetallic organic framework derivative evaporator with high-efficiency photothermal conversion, and a preparation method and application thereof. Background Art

[0002] Solar water evaporation relies on the sun, a renewable energy source, and is green, environmentally friendly, and energy-efficient. Metal-organic frameworks (MOFs) derived from carbonization can be well encapsulated within the carbon framework, resulting in a broad light absorption range. By varying the metal center and organic ligands, MOF derivatives with specific properties can be designed and synthesized.

[0003] Chen et al. fabricated a solar evaporator by in situ growth of a bimetallic Fe-Ni-MOF-74 on bamboo. The hydrophilicity and porous structure of Fe-Ni-MOF-74 enhance the water activation and water transport capabilities of the solar evaporator. Bamboo retains its original porous hydrophilic properties, ensuring rapid water transfer to the evaporation interface. Furthermore, due to the bimetallic coordination, Fe-Ni-MOF-74 exhibits a good photothermal effect. (Desalination, 2024, 117091).

[0004] Fan et al. used bimetallic node defect engineering to construct a fiber evaporator derived from MIL-100 (Fe, Al) MOF. The MIL-100 (Fe, Al) MOF derivative has a high specific surface area and pore volume, which gives it a strong ability to capture water molecules. (Water Research, 2024, 121872).

[0005] Huang et al. in situ loaded a multi-metal MOF onto biomass materials and, after calcination, produced a biomass-loaded multi-metal MOF porous photothermal material. The multi-metal MOF derivative exhibits excellent thermal and chemical stability, and its high surface area provides more interfacial evaporation sites, thereby accelerating water evaporation (CN118978214A).

[0006] However, the materials used in the above methods are expensive, have poor photothermal performance, and short service life, which is not conducive to large-scale preparation.

[0007] In summary, the existing technology has disadvantages such as the photothermal evaporator itself contains heavy metals and organic pollutants, the preparation process is too complicated, and the cost is too high. Summary of the Invention

[0008] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion and its preparation method and application, which has the characteristics of simple preparation process, high evaporation efficiency, high mechanical stability, good chemical stability, low cost, simple preparation and easy recycling.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A high-efficiency photothermal conversion bimetallic organic framework derivative evaporator is composed of bimetallic MOF with a particle size of 0.5-5 μm after carbonization cross-linked in a foam with a three-dimensional porous matrix network structure with a pore size of 1-100 μm.

[0011] A method for preparing a bimetallic organic framework derivative evaporator with high efficiency photothermal conversion comprises the following steps:

[0012] Step 1: dissolving two metal salts and a ligand in a solvent according to a stoichiometric ratio, stirring to form a uniform mixed solution, centrifuging, washing, and drying the mixed solution to obtain a bimetallic MOF;

[0013] Step 2, placing the bimetallic MOF into a tube furnace for calcination to obtain a carbonized bimetallic MOF;

[0014] Step 3, mixing a crosslinking agent, water, and the carbonized bimetallic MOF to form a slurry;

[0015] Step 4: soaking the three-dimensional porous matrix in the slurry, cross-linking, and then drying to obtain a bimetallic organic framework derivative evaporator.

[0016] Preferably, in step 1, the concentration ratio of the two metal salts in the solvent is 1:10 to 10:1 mol / L; and the concentration of the ligand in the solvent is 0.001 to 1 g / mL.

[0017] Preferably, in step 1, the stirring time is 1 to 48 hours, the mixture is centrifuged using a solvent at a centrifugal speed of 5000 to 1000 r / min, washed, and dried in an oven to fully remove the residual metal salts and ligands in the bimetallic MOF.

[0018] The metal salts are two mixtures of AlCl3·6H2O, Al(NO3)3·9(H2O), Bi(NO3)3·5H2O, ZrCl4, ZrOCl2·8H2O, CuCl2, FeCl3, Ti(OBu)4, Ce(NO3)3, Zn(NO3)2·6H2O, and Co(NO3)2;

[0019] The ligand is one of trimesic acid, 2-aminoterephthalic acid, chlorophenylamine, diphenylphosphoric acid, dimethylimidazole and ethylenediamine;

[0020] The solvent is one of methanol, N,N-dimethylformamide and water.

[0021] Preferably, in step 2, the bimetallic MOF is calcined in a tube furnace under an Ar gas atmosphere at a calcination temperature of 400-1000° C., a heating rate of 1-10° C. / min, and a calcination time of 15-180 min to achieve more complete carbonization of the bimetallic MOF.

[0022] Preferably, in step 2, carbonized bimetallic MOF powder is obtained by grinding.

[0023] Preferably, in step 3, the cross-linking agents used are PVA and SA, and the mass concentration ratio of PVA to SA is 1:10 to 10:1 mol / L.

[0024] Preferably, in step 3, an oil bath is used for stirring, the oil bath is kept warm at a temperature of 40-100° C., and the oil bath is kept warm for 10-240 minutes. After stirring in the oil bath, the carbonized and ground bimetallic MOF is added to the solution at a concentration of 0.1-10 g / L to allow the crosslinker to be fully dissolved in the solvent.

[0025] Preferably, in step 3, the mass concentration of the carbonized bimetallic MOF is 0.1-10 g / L, and the ratio of the cross-linking agent to the bimetallic MOF is 1:1-1:10.

[0026] Preferably, in step 3, ultrasonic treatment is performed for 1-60 min to uniformly disperse the mixture in the solution.

[0027] Preferably, in step 4, the three-dimensional porous matrix is ​​immersed in the slurry and cross-linked, then placed in an oven for drying, and repeated 1-10 times. The treated three-dimensional porous matrix is ​​cross-linked in a 0.1-10wt% CaCl2 solution and a 0.1-10wt% glutaraldehyde solution for 10-180 minutes respectively, and washed with deionized water to obtain a bimetallic organic framework derivative evaporator with high efficiency of photothermal conversion.

[0028] The three-dimensional porous matrix is ​​one of polyurethane foam, melamine foam and polypropylene foam.

[0029] The high-efficiency photothermal conversion bimetallic organic framework derivative evaporator is used in the field of seawater desalination with high salt content and severe water pollution.

[0030] Beneficial effects of the present invention:

[0031] The bimetallic MOF prepared by the present invention has good photothermal performance. The carbonized bimetallic MOF obtained by calcination has a more excellent photothermal effect and higher thermal conductivity than the bimetallic MOF, which helps to quickly conduct the absorbed heat.

[0032] The carbonized bimetallic MOF is loaded on a three-dimensional porous matrix through two-step cross-linking. The porous structure of the three-dimensional porous matrix provides a transmission channel for water molecules, promoting the contact between the carbonized bimetallic MOF and water molecules. In addition, the design of the photothermal layer and the water transfer layer allows more heat to be retained in the evaporator rather than transferred to the environment through heat exchange, preventing heat loss. The hierarchical porous structure of the carbonized bimetallic MOF and the three-dimensional porous matrix provides more evaporation sites for water molecules. The preparation process of the present invention is simple, the evaporator has high evaporation efficiency, high mechanical stability, good chemical stability, low cost, simple preparation, and is easy to recycle, and has extremely high benefits in seawater desalination. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The invention discloses an evaporator prepared by the present invention.

[0034] Figure 2 This is the water evaporation curve of the evaporator prepared by the present invention under 1 sun.

[0035] Figure 3 Compression curve of the evaporator prepared in the present invention in water.

[0036] Figure 4 This is the temperature rise curve of the evaporator prepared by the present invention.

[0037] Figure 5 It is the ultraviolet-visible light absorption spectrum of the evaporator prepared by the present invention.

[0038] Figure 6 It is the desalination performance of the evaporator prepared by the present invention in 50 ml of a salt solution with a concentration of 20% under 1 sunlight. DETAILED DESCRIPTION

[0039] The present invention will be described in further detail below with reference to the accompanying drawings.

[0040] The present invention discloses a method for preparing a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion, which specifically comprises the following steps:

[0041] Step 1: Two metal salts and a ligand are weighed and dissolved in a solvent according to a certain stoichiometric ratio, stirred to form a uniform mixed solution, and the mixed solution is centrifuged, washed, and then dried to obtain a bimetallic MOF;

[0042] Specifically, the concentration ratio of the two metal salts in the solvent is 1:10 to 10:1 mol / L; the concentration of the ligand in the solvent is 0.001 to 1 g / mL; the concentration of the solvent is 0.001 to 1.0 mol / mL, the stirring time is 1 to 48 hours, the solvent is centrifuged at a centrifugal speed of 5000 to 1000 r / min, washed, and dried in an oven.

[0043] Step 2, placing the bimetallic MOF into a tube furnace for calcination to obtain a carbonized bimetallic MOF;

[0044] Specifically, the bimetallic MOF is calcined in a tube furnace under an Ar gas atmosphere at a calcination temperature of 400-1000° C., a heating rate of 1-10° C. / min, and a calcination time of 15-180 min. Carbonized bimetallic MOF powder is obtained by grinding.

[0045] Step 3, mixing a crosslinking agent, water, and the carbonized bimetallic MOF to form a slurry;

[0046] Specifically, the crosslinking agents are PVA and SA, with a mass concentration ratio of PVA to SA of 1:10 to 10:1 mol / L. An oil bath is used for stirring, and the oil bath is kept warm at a temperature of 40-100°C for 10-240 minutes. After stirring in the oil bath, a carbonized bimetallic MOF at a mass concentration of 0.1-10 g / L is added to the solution, and ultrasonic treatment is performed for 1-60 minutes to uniformly disperse it in the solution.

[0047] Step 4: soaking the three-dimensional porous matrix in the slurry, cross-linking, and then drying to obtain a bimetallic organic framework derivative evaporator.

[0048] Specifically, the three-dimensional porous matrix is ​​immersed in a slurry, cross-linked, and then dried in an oven, repeating this process 1-10 times. The treated three-dimensional porous matrix is ​​then cross-linked in a 0.1-10 wt% CaCl2 solution and a glutaraldehyde solution for 10-180 minutes, respectively, and then rinsed with deionized water to produce a bimetallic organic framework derivative evaporator with high efficiency for photothermal conversion.

[0049] Example 1

[0050]

[0051]

[0052] AlCl3·6H2O, Zn(NO3)2·6H2O and trimesic acid are added to N,N-dimethylformamide, the concentration ratio of AlCl3·6H2O and Zn(NO3)2·6H2O in N,N-dimethylformamide is 1:10, the concentration of trimesic acid in N,N-dimethylformamide is 0.1 mol / L, and the mixture is stirred for 5 hours and then centrifuged at 5000 r / min, centrifuged and washed with a solvent, and then dried in an oven.

[0053] The bimetallic MOF was calcined in an Ar gas atmosphere in a tube furnace at a temperature of 400°C, a heating rate of 10°C / min, and a calcination time of 50 min. The carbonized bimetallic MOF was obtained by grinding.

[0054] PVA and SA were mixed in water at a mass ratio of 10:1. The mixture was stirred in an oil bath at 100°C for 30 minutes. After stirring, 0.1 g / L of carbonized bimetallic MOF was added to the solution and ultrasonicated for 30 minutes to ensure uniform dispersion.

[0055] The polyurethane foam was immersed in the mixed solution and then dried, and this process was repeated once. The treated polyurethane foam was then cross-linked in a 0.1wt% CaCl2 solution and a 0.1wt% glutaraldehyde solution for 10 minutes, respectively, and then washed with deionized water to obtain a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion. Figure 1 The evaporator prepared by this method is shown, which includes the prepared evaporator and the carbonized bimetallic MOF loaded into the polyurethane foam structure. The carbonized bimetallic MOF provides more photothermal active sites.

[0056] Example 2

[0057]

[0058]

[0059] Co(NO3)2, Zn(NO3)2·6H2O and 2-aminoterephthalic acid were added to water, the concentration ratio of AlCl3·6H2O and Zn(NO3)2·6H2O in water was 1:1, the concentration of 2-aminoterephthalic acid in water was 0.8 mol / L, and the mixture was stirred for 24 h and centrifuged at 8000 r / min. The mixture was centrifuged and washed with a solvent and then dried in an oven.

[0060] The bimetallic MOF was calcined in an Ar gas atmosphere in a tube furnace at a temperature of 800°C, a heating rate of 5°C / min, and a calcination time of 150 min. The carbonized bimetallic MOF was obtained by grinding.

[0061] PVA and SA were mixed in water at a mass ratio of 1:10. The mixture was stirred in an oil bath at 30°C for 60 minutes. After stirring, the carbonized bimetallic MOF was added to the solution at a concentration of 10 g / L and ultrasonicated for 10 minutes to ensure uniform dispersion.

[0062] Melamine foam was immersed in the mixed solution and then dried, repeated 10 times. The treated melamine foam was cross-linked in a 0.5wt% CaCl2 solution and a 10wt% glutaraldehyde solution for 180 minutes and 120 minutes, respectively, and then washed with deionized water to obtain a high-efficiency photothermal conversion bimetallic organic framework derivative evaporator. Figure 2 The figure shows the evaporation curve of the evaporator under 1 sun. The water evaporation rate of the bimetallic organic framework derivative evaporator is as high as 2.09 kg / m in 1 hour. 2 .

[0063] Example 3

[0064]

[0065]

[0066] AlCl3·6H2O, ZrOCl2·8H2O and dimethylimidazole were added to N,N-dimethylformamide, the concentration ratio of AlCl3·6H2O and ZrOCl2·8H2O in water was 1:5, the concentration of dimethylimidazole in N,N-dimethylformamide was 0.4 mol / L, and the mixture was stirred for 48 hours and then centrifuged at 10000 r / min. The mixture was centrifuged and washed with a solvent and then dried in an oven.

[0067] The bimetallic MOF was calcined in an Ar gas atmosphere in a tubular furnace at a temperature of 600°C, a heating rate of 5°C / min, and a calcination time of 180 min. The carbonized bimetallic MOF was obtained by grinding.

[0068] PVA and SA were mixed in water at a 1:1 mass ratio. The mixture was stirred in an oil bath at 40°C for 90 minutes. After stirring, the carbonized bimetallic MOF was added to the solution at a concentration of 1 g / L and ultrasonicated for 60 minutes to ensure uniform dispersion.

[0069] The polypropylene foam was immersed in the mixed solution and then dried, and this process was repeated three times. The treated polypropylene foam was then crosslinked in a 10 wt% CaCl2 solution and a 1 wt% glutaraldehyde solution for 180 min and 100 min, respectively, and then washed with deionized water to obtain a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion. Figure 3 The evaporator shown has good elasticity underwater. Under the stress of 23.82 kPa, the deformation of the evaporator can reach 80%.

[0070] Example 4

[0071]

[0072]

[0073] Ce(NO3)3, Co(NO3)2 and diphenylphosphoric acid were added to methanol, the concentration ratio of Ce(NO3)3 and Co(NO3)2 in methanol was 1:5, the concentration of diphenylphosphoric acid in methanol was 5 mol / L, and after stirring for 10 h, centrifuged at 5000 r / min, centrifuged and washed with a solvent, and then dried in an oven.

[0074] The bimetallic MOF was calcined in an Ar gas atmosphere in a tubular furnace at a temperature of 1000°C, a heating rate of 5°C / min, and a calcination time of 100 min. The carbonized bimetallic MOF was obtained by grinding.

[0075] PVA and SA were mixed in water at a mass ratio of 5:1. The mixture was stirred in an oil bath at 90°C for 180 minutes. After stirring, the carbonized bimetallic MOF was added to the solution at a concentration of 5 g / L and ultrasonicated for 1 minute to ensure uniform dispersion.

[0076] The polyurethane foam was immersed in the mixed solution and then dried, and this process was repeated five times. The treated polyurethane foam was then crosslinked in a 5wt% CaCl2 solution and a 0.5wt% glutaraldehyde solution for 30 minutes and 100 minutes, respectively, and then washed with deionized water to obtain a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion. Figure 4 As shown on the left, under 1 sunlight, the evaporator heats up rapidly at the gas-liquid interface until the temperature reaches 44.5°C and then stabilizes. Therefore, the evaporator has extremely high light-to-heat conversion performance and extremely high efficiency in water evaporation. Figure 4 The right side shows the temperature rise curve of the dried bimetallic organic framework derivative evaporator under 1 sun, which rises in 180s and stabilizes to 81.9℃.

[0077] Example 5

[0078]

[0079]

[0080] CuCl2, FeCl3 and chlorophenylamine are added to N,N-dimethylformamide, the concentration ratio of CuCl2 and FeCl3 in N,N-dimethylformamide is 5:1, the concentration of chlorophenylamine in N,N-dimethylformamide is 5 mol / L, and the mixture is stirred for 36 hours and then centrifuged at 6000 r / min. The mixture is centrifuged and washed with a solvent and then dried in an oven.

[0081] The bimetallic MOF was calcined in an Ar gas atmosphere in a tube furnace at a temperature of 800°C, a heating rate of 15°C / min, and a calcination time of 150 min. The carbonized bimetallic MOF was obtained by grinding.

[0082] PVA and SA were mixed in water at a mass ratio of 1:5. The mixture was stirred in an oil bath at 50°C for 150 minutes. After stirring, the carbonized bimetallic MOF was added to the solution at a concentration of 8 g / L and ultrasonicated for 50 minutes to ensure uniform dispersion.

[0083] Melamine foam was immersed in the mixed solution and then dried, repeated five times. The treated melamine foam was cross-linked in a 5wt% CaCl2 solution and a 10wt% glutaraldehyde solution for 50 minutes and 150 minutes, respectively, and then washed with deionized water to obtain a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion. Figure 5 The UV-visible light curve of the evaporator shows that the evaporator absorbs up to 96% of the full spectrum light.

[0084] Example 6

[0085]

[0086] Ti(OBu)4, ZrCl4 and ethylenediamine were added to water, the concentration ratio of Ti(OBu)4 and ZrCl4 in water was 1:1, the concentration of ethylenediamine in water was 8 mol / L, and after stirring for 48 hours, the mixture was centrifuged at 7000 r / min, centrifuged and washed with a solvent, and then dried in an oven.

[0087] The bimetallic MOF was calcined in an Ar gas atmosphere in a tubular furnace at a temperature of 800°C, a heating rate of 5°C / min, and a calcination time of 180 min. The carbonized bimetallic MOF was obtained by grinding.

[0088] PVA and SA were mixed in water at a mass ratio of 1:10. The mixture was stirred in an oil bath at 50°C for 180 minutes. After stirring, the carbonized bimetallic MOF was added to the solution at a concentration of 10 g / L and ultrasonicated for 60 minutes to ensure uniform dispersion.

[0089] The polypropylene foam was immersed in the mixed solution and then dried, and this process was repeated 10 times. The treated polypropylene foam was then crosslinked in a 5wt% CaCl2 solution and a 5wt% glutaraldehyde solution for 100 minutes and 150 minutes, respectively, and then washed with deionized water to obtain a bimetallic organic framework derivative evaporator with high efficiency in photothermal conversion. Figure 6 The evaporator shown has a self-cleaning function. When salt contamination occurs on the evaporator, the salt can be cleaned off the surface of the evaporator. Therefore, the evaporator has desalination performance and can be used for a long time.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bimetallic organic framework derivative evaporator with high efficiency photothermal conversion, characterized in that: The bimetallic MOF with a particle size of 0.5-5 μm after carbonization is cross-linked in a foam with a three-dimensional porous matrix structure with a pore size of 1-100 μm.

2. A method for preparing a bimetallic organic framework derivative evaporator with high efficiency photothermal conversion, characterized in that: The following steps are included: Step 1: dissolving two metal salts and a ligand in a solvent according to a stoichiometric ratio, stirring to form a uniform mixed solution, centrifuging, washing, and drying the mixed solution to obtain a bimetallic MOF; Step 2, placing the bimetallic MOF into a tube furnace for calcination to obtain a carbonized bimetallic MOF; Step 3, mixing a crosslinking agent, water, and the carbonized bimetallic MOF to form a slurry; Step 4: soaking the three-dimensional porous matrix in the slurry, cross-linking, and then drying to obtain a bimetallic organic framework derivative evaporator.

3. The method for preparing a bimetallic organic framework derivative evaporator for high-efficiency photothermal conversion according to claim 2, characterized in that: In step 1, the concentration ratio of the two metal salts in the solvent is 1:10 to 10:1 mol / L; the concentration of the ligand in the solvent is 0.001 to 1 g / mL.

4. The method for preparing a bimetallic organic framework derivative evaporator for high-efficiency photothermal conversion according to claim 2, characterized in that: In step 1, the stirring time is 1 to 48 hours, the solvent is used for centrifugation at a centrifugal speed of 5000 to 1000 r / min, and the product is washed and dried in an oven.

5. The method for preparing a bimetallic organic framework derivative evaporator for high-efficiency photothermal conversion according to claim 2, characterized in that: The metal salts are two mixtures of AlCl3·6H2O, Al(NO3)3·9(H2O), Bi(NO3)3·5H2O, ZrCl4, ZrOCl2·8H2O, CuCl2, FeCl3, Ti(OBu)4, Ce(NO3)3, Zn(NO3)2·6H2O, and Co(NO3)2; The ligand is one of trimesic acid, 2-aminoterephthalic acid, chlorophenylamine, diphenylphosphoric acid, dimethylimidazole and ethylenediamine; The solvent is one of methanol, N,N-dimethylformamide and water.

6. The method for preparing a bimetallic organic framework derivative evaporator for high-efficiency photothermal conversion according to claim 2, characterized in that: In step 2, the bimetallic MOF is calcined in an Ar gas atmosphere in a tubular furnace at a calcination temperature of 400-1000° C., a heating rate of 1-10° C. / min, and a calcination time of 15-180 min.

7. The method for preparing a bimetallic organic framework derivative evaporator for high-efficiency photothermal conversion according to claim 2, characterized in that: In step 3, the cross-linking agents used are PVA and SA, and the mass concentration ratio of PVA to SA is 1:10 to 10:1 mol / L; In step 3, an oil bath is used for stirring, the oil bath stirring and holding temperature is 40-100° C., the oil bath stirring and holding time is 10-240 min, and after stirring in the oil bath, the carbonized and ground bimetallic MOF is added to the solution at a mass concentration of 0.1-10 g / L; In step 3, the mass concentration of the carbonized bimetallic MOF is 0.1 to 10 g / L, and the ratio of the crosslinker to the bimetallic MOF is 1:1 to 1:10; In step 3, ultrasonic treatment is performed for 1-60 min to uniformly disperse the solution.

8. The method for preparing a bimetallic organic framework derivative evaporator with high efficiency photothermal conversion according to claim 2, characterized in that: In step 4, the three-dimensional porous matrix is ​​immersed in the slurry, cross-linked, and then placed in an oven for drying, and repeated 1-10 times. The treated three-dimensional porous matrix is ​​cross-linked in a 0.1-10wt% CaCl2 solution and a 0.1-10wt% glutaraldehyde solution for 10-180 minutes respectively, and washed with deionized water to obtain a high-efficiency photothermal conversion bimetallic organic framework derivative evaporator.

9. The method for preparing a bimetallic organic framework derivative evaporator for high-efficiency photothermal conversion according to claim 8, characterized in that: The three-dimensional porous matrix is ​​one of polyurethane foam, melamine foam and polypropylene foam.

10. A bimetallic organic framework derivative evaporator for efficient photothermal conversion according to any one of claims 1 to 9, characterized in that: The high-efficiency photothermal conversion bimetallic organic framework derivative evaporator is used in the field of seawater desalination with high salt content and severe water pollution.

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