Porous liquid direct air carbon trapping device based on wind-solar complementation, preparation method and application

Abstract

The invention relates to the technical field of negative carbon emission, in particular to a porous liquid direct air carbon trapping device based on wind-solar complementation, a preparation method and application. Comprising a wind-solar complementary power generation and power supply subsystem, a porous liquid absorption and desorption subsystem and an air compression and carbon dioxide collection subsystem, and the wind-solar complementary power generation and power supply subsystem is used for power supply of electric equipment and regeneration of porous liquid; the liquid absorption and desorption subsystem is used for efficiently absorbing carbon dioxide in air and regenerating and recycling a porous liquid material; and the air compression and carbon dioxide collection subsystem is used for compressing and conveying air and collecting and treating carbon dioxide. The porous liquid disclosed by the invention has the characteristics of high CO2 adsorption capacity and low-energy-consumption regeneration, the electric quantity generated by wind-solar complementary power generation is used for absorbing carbon dioxide in the air, and the porous liquid is regenerated and recycled, so that the low-cost operation of the porous liquid direct air carbon capture device is realized; the purpose of efficiently treating carbon dioxide in the atmosphere in a low-carbon mode to relieve the greenhouse effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of negative carbon emission technology, and in particular to a porous liquid direct air carbon capture device based on wind-solar hybridization, its preparation method and application. Background Technology

[0002] Global climate change is the greatest threat to human sustainable development, and controlling CO2 emissions is a major measure to address climate change. Direct air carbon capture (SACC) technology has become one of the important solutions for addressing climate change and carbon emissions. The performance and cost of SACC materials are key factors determining whether SACC technology can be applied on a large scale. The mainstream SACC methods include solid adsorption and solution absorption, involving solid adsorbents and liquid absorbents. Solid adsorbents have the advantage of low-temperature regeneration and utilize low-grade heat energy to reduce operating costs, but their energy consumption for capturing carbon dioxide is relatively high. Liquid absorbents can be easily scaled up using existing mature technologies, but their regeneration energy consumption is high, and liquid absorbents are prone to corroding equipment, resulting in high maintenance costs, thus limiting their application scenarios. Based on this, a porous liquid SACC device based on wind-solar hybridization, its preparation method, and its application are proposed. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a porous liquid direct air carbon capture device and its preparation method based on wind-solar complementary technology, so as to improve the adsorption capacity of carbon dioxide, reduce the operating cost of the equipment, and thus achieve low-carbon and high-efficiency direct air carbon capture.

[0004] The technical solution of the present invention, in its first aspect, provides a porous liquid direct air carbon capture device based on wind-solar hybridization, comprising:

[0005] A wind-solar hybrid power generation and power supply system is used to provide heat and power for the entire unit.

[0006] The liquid absorption and desorption subsystem uses porous liquid to absorb carbon dioxide from the air, desorbs and desorbs high concentrations of carbon dioxide, and then transports it to the air compression and carbon dioxide collection subsystem for processing.

[0007] An air compression and carbon dioxide collection subsystem is used for the compressed transport of air and the collection and treatment of high-purity carbon dioxide.

[0008] The porous liquid adsorbent is used to circulate and absorb carbon dioxide and desorb and output high-purity carbon dioxide through the liquid absorption and desorption subsystem, thereby realizing the recycling of materials and reducing operating costs.

[0009] Preferably, the wind-solar hybrid power generation and power supply system includes solar thermal photovoltaic integrated modules, wind turbine generator modules, inverters and batteries, used for heating the solution absorption and desorption subsystems and powering the entire system;

[0010] The wind-solar hybrid power generation and power supply system adopts the maximum absorption operation mode, which uses the electricity generated by the solar thermal photovoltaic integrated module and the wind turbine module to supply the system with the electricity generated by wind and solar resources, and charges the excess electricity to the energy storage; when wind and solar resources are abundant, the excess electricity is used for system heating and appropriate waste disposal; when wind and solar resources are insufficient, the energy storage or backup power source is called to supply the system.

[0011] Preferably, the liquid absorption and desorption subsystem includes an absorption tower, a pressure reducing valve, a heat exchanger, a desorption tower, a cooler, and a circulating pump;

[0012] The absorption tower in the liquid absorption and desorption subsystem is used to absorb carbon dioxide and output air with a low concentration of carbon dioxide, while the porous liquid adsorbent that has absorbed carbon dioxide is delivered to the pressure reducing valve.

[0013] The pressure reducing valve in the liquid absorption and desorption subsystem is used to reduce the pressure of the porous liquid adsorbent fed into the absorption tower to the stable low pressure required by the heat exchanger and desorption tower, so as to protect the heat exchanger and desorption tower.

[0014] The porous liquid adsorbent in the liquid absorption and desorption subsystem is heated by a heat exchanger and then further transported to the desorption tower for carbon dioxide desorption.

[0015] Preferably, the cooler is used to cool the desorbed porous liquid adsorbent so that it enters the circulating pump and eventually returns to the absorption tower to realize the recycling of the porous liquid adsorbent;

[0016] The circulating pump is equipped with an agitator.

[0017] Preferably, the air compression and carbon dioxide collection subsystem is used for the compressed delivery of air and the collection and treatment of high-purity carbon dioxide, and includes an air compressor, a cooler, and a carbon dioxide collector.

[0018] The air in the air compression and carbon dioxide collection subsystem is compressed by an air compressor, then cooled by a cooler, and finally enters the absorption tower.

[0019] The carbon dioxide collector in the air compression and carbon dioxide collection subsystem is used to collect high-purity carbon dioxide blown out of the desorption tower for subsequent processing.

[0020] Preferably, the porous liquid adsorbent uses porous solid nanoparticles as pore-forming devices and a dual-cationic ionic liquid as a steric solvent.

[0021] The porous liquid adsorbent is composed of metal-organic framework nanoparticles dispersed in a dual-cationic liquid.

[0022] The porous liquid adsorbent contains metal-organic framework nanoparticles with amine groups on the outer layer to amination the porous liquid.

[0023] Preferably, the electricity generated by the solar thermal photovoltaic integrated module and the wind turbine is used to heat the absorption tower and desorption tower and to power the air compressor via an inverter and a battery.

[0024] A second aspect of the present invention provides a method for preparing an absorption medium, comprising the following specific steps:

[0025] S1. Preparation of MOF nanoparticles RICBEM as a porous liquid adsorbent:

[0026] Tetracarboxylic acid ligand H4ADBTD and copper nitrate trihydrate Cu(NO3)2·3H2O were dissolved in dimethylformamide DMF;

[0027] After adding fluoroboric acid HBF4 to the above solution and sonicating, the solution was placed in a reaction vessel, heated at 90°C, and cooled multiple times at 3°C / 20min. The green crystals were collected by filtration and washed with dimethylformamide DMF.

[0028] The product was soaked in methanol, and the supernatant was discarded at intervals. The sample was then treated with acetone and dichloromethane in the same way. It was dried under vacuum at 120°C overnight. The resulting product was RICBEM nanoparticles.

[0029] S2. Preparation of [DBU-PEG][NTf2] dual-cationic ionic liquid:

[0030] Compound 1: Dissolve triethylene glycol (TEG) and formyl chloride in dichloromethane (DCM), add potassium hydroxide (KOH) powder to the mixture, and stir at low temperature;

[0031] Compound 2: 1,8-diazabicyclo[5.4.0]undec-7-ene DBU and Compound 1 were added to dry toluene. The mixture was stirred under nitrogen and stored at low temperature overnight. Excess toluene was decanted. The residue was washed with dry diethyl ether and dried under vacuum to obtain a deep yellow viscous compound 2.

[0032] Compound 3: Compound 2 and lithium bis(trifluoromethanesulfonyl)imide LiNTf2 were dissolved in acetonitrile and stirred overnight. The mixture was then diluted with dichloromethane (DCM), washed with deionized water, filtered, concentrated, and vacuum dried to obtain a yellow viscous compound 3, i.e., the ionic liquid [DBU-PEG][NTf2].

[0033] S3. Preparation of RICBEM-based porous liquid adsorbent:

[0034] The synthesized RICBEM nanoparticles were dispersed in methanol and stirred vigorously, followed by sonication to further disperse the RICBEM nanoparticles. [DBU-PEG][NTf2] was added to the above RICBEM suspension and stirred to obtain a uniform suspension.

[0035] After drying overnight under vacuum at 80°C, the prepared porous liquid was named RICBEM-based porous liquid and dried under high-temperature vacuum for later use.

[0036] A third aspect of the present invention provides an application of a porous liquid direct air carbon capture device based on wind-solar hybridization, wherein the device and the absorption medium prepared therein are used in an island area for direct air carbon capture.

[0037] A fourth aspect of the present invention provides an application of a porous liquid direct air carbon capture device based on wind-solar hybridization, wherein the device and the absorption medium prepared therein are used on a ship for direct air carbon capture.

[0038] Compared with the prior art, the present invention has the following beneficial technical effects:

[0039] (1) This invention utilizes wind-solar hybrid power generation technology to provide heat for the regeneration of the absorption solution and power the equipment such as the circulating pump and the agitator, thereby achieving efficient utilization of renewable energy.

[0040] (2) The present invention uses porous liquid as the absorption medium, which has the characteristics of low-temperature regeneration of solid adsorbent, low-cost operation and high carbon dioxide adsorption capacity of liquid adsorbent, thereby improving the efficiency of carbon dioxide absorption by solution and realizing the operation of a high-efficiency and low-carbon direct air carbon capture device.

[0041] (3) The present invention realizes the absorption and desorption of carbon dioxide by porous liquid through components such as absorption tower, desorption tower and circulating pump, and recycles and reuses porous liquid, thereby reducing the complexity of the process and avoiding unnecessary resource consumption.

[0042] (4) The present invention adds an agitator to the circulating pump to promote the circulation and transport of porous liquid and accelerate the operating efficiency of the system. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the porous liquid direct air carbon capture device based on wind-solar complementarity in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of a porous liquid structure in an embodiment of the present invention;

[0045] Figure 3 This is a photograph of the porous liquid in an embodiment of the present invention;

[0046] Figure 4 This is a flowchart of the method for preparing porous liquid adsorbent in an embodiment of the present invention.

[0047] Reference numerals: 1. Wind-solar hybrid power generation and power supply system; 101. Solar thermal-photovoltaic integrated module; 102. Wind turbine; 103. Inverter; 104. Battery; 2. Liquid absorption and desorption subsystem; 201. Absorption tower; 202. Pressure reducing valve; 203. Heat exchanger; 204. Desorption tower; 205. Cooler; 206. Circulation pump; 3. Air compression and carbon dioxide collection subsystem; 301. Air compressor; 302. Cooler; 303. Carbon dioxide collection device; 4. Porous liquid adsorbent; 401. Heavy ion liquid; 402. Surface groups; 403. Metal-organic framework nanoparticles. Detailed Implementation

[0048] Example 1

[0049] like Figure 1 As shown, the present invention proposes a porous liquid direct air carbon capture device based on wind-solar hybridization, suitable for installation in high-wind-speed areas at sea, specifically comprising:

[0050] Wind-solar hybrid power generation and power supply system 1, used to provide heat and power to the entire unit;

[0051] The liquid absorption and desorption subsystem 2 uses porous liquid adsorbent 4 to absorb carbon dioxide from the air, and after desorbing and desorbing high concentrations of carbon dioxide, it is transported to the air compression and carbon dioxide collection subsystem 3 for processing.

[0052] Air compression and carbon dioxide collection subsystem 3 is used for air compression and transportation as well as the collection and treatment of high-purity carbon dioxide.

[0053] The porous liquid adsorbent 4 is circulated through the liquid absorption and desorption subsystem 2 to absorb carbon dioxide and desorb and output high-purity carbon dioxide, thereby realizing the recycling of materials and reducing operating costs.

[0054] In this embodiment, the wind-solar hybrid power generation and power supply system 1 includes a solar thermal photovoltaic integrated module 101, a wind turbine generator module 102, an inverter 103, and a battery 104, which are used for heating the solution absorption and desorption subsystem 2 and powering the entire system. The wind-solar hybrid power generation and power supply system 1 adopts a maximum absorption operation mode, using the electricity generated by the solar thermal photovoltaic integrated module 101 and the wind turbine generator module 102 from wind and solar resources for system power supply, and charging excess electricity to energy storage. When wind and solar resources are abundant, excess electricity is used for system heating and appropriate waste disposal. When wind and solar resources are insufficient, energy storage or backup power sources are called upon for power supply.

[0055] In this embodiment, the liquid absorption and desorption subsystem 2 includes an absorption tower 201, a pressure reducing valve 202, a heat exchanger 203, a desorption tower 204, a cooler 205, and a circulating pump 206. The absorption tower 201 in the liquid absorption and desorption subsystem 2 absorbs carbon dioxide and outputs air with a low concentration of carbon dioxide, while simultaneously conveying the porous liquid adsorbent 4 that has absorbed carbon dioxide to the pressure reducing valve 202. The pressure reducing valve 202 in the liquid absorption and desorption subsystem 2 depressurizes the porous liquid adsorbent 4 conveyed from the absorption tower 201 to the heat exchanger. The stable low pressure required for heat exchanger 203 and desorption tower 204 is used to protect heat exchanger 203 and desorption tower 204. The porous liquid adsorbent 4 in the liquid absorption and desorption subsystem 2 is heated by heat exchanger 203 and then further transported to desorption tower 204 for carbon dioxide desorption. Cooler 205 is used to cool the desorbed porous liquid adsorbent 4 so that it can enter the circulation pump 206 and finally return to absorption tower 201 to realize the recycling of porous liquid. The circulation pump 206 is equipped with a stirring paddle to promote the circulation and transportation of porous liquid and accelerate the operating efficiency of the system.

[0056] In this embodiment, the air compression and carbon dioxide collection subsystem 3 is used for compressing and transporting air and collecting and processing high-purity carbon dioxide, including an air compressor 301, a cooler 302, and a carbon dioxide collector 303; the air in the air compression and carbon dioxide collection subsystem 3 is compressed by the air compressor 301, then enters the cooler 302 for cooling, and finally enters the absorption tower 201; the carbon dioxide collector 3 in the air compression and carbon dioxide collection subsystem 3 is used to collect the high-purity carbon dioxide blown out of the desorption tower for subsequent processing.

[0057] In this embodiment, as Figure 2 As shown, the porous liquid adsorbent 4 uses porous solid nanoparticles as pore-forming devices and a dual-cationic ionic liquid as a steric solvent.

[0058] The porous liquid adsorbent 4 is composed of metal-organic framework nanoparticles and dispersed in a dual-cationic liquid.

[0059] The porous liquid adsorbent 4 contains metal-organic framework nanoparticles with amine groups on the outer layer to amination the porous liquid.

[0060] In this embodiment, the electricity generated by the solar thermal photovoltaic integrated module 101 and the wind turbine generator 102 is used to heat the absorption tower 201 and the desorption tower 202 via the inverter 103 and the battery 104, and to supply power to the air compressor 206.

[0061] This embodiment uses porous liquid as the absorption medium to improve the carbon dioxide adsorption capacity, which facilitates the subsequent regeneration and recycling of the porous liquid and reduces costs. In addition, it combines a wind-solar hybrid integrated generator to directly power and heat the air carbon capture system.

[0062] Example 2

[0063] like Figure 4 This embodiment provides a method for preparing an absorption medium, specifically the porous adsorbent in Example 1, comprising the following steps:

[0064] S1. Preparation of MOF nanoparticles RICBEM as a porous liquid adsorbent:

[0065] Tetracarboxylic acid ligand H4ADBTD and copper nitrate trihydrate Cu(NO3)2·3H2O were dissolved in dimethylformamide DMF;

[0066] After adding fluoroboric acid HBF4 to the above solution and sonicating, the solution was placed in a reaction vessel, heated at 90°C, and cooled multiple times at 3°C / 20min. The green crystals were collected by filtration and washed with dimethylformamide DMF.

[0067] The product was soaked in methanol, and the supernatant was discarded at intervals. The sample was then treated with acetone and dichloromethane in the same manner and dried overnight under vacuum at 120°C.

[0068] S2. Preparation of [DBU-PEG][NTf2] dual-cationic ionic liquid:

[0069] Compound 1: Triethylene glycol (TEG) and formyl chloride were dissolved in dichloromethane (DCM), KOH powder was added to the mixture, and the mixture was stirred at low temperature;

[0070] Compound 2: 1,8-diazabicyclo[5.4.0]undec-7-ene DBU and Compound 1 were added to dry toluene. The mixture was stirred under nitrogen and stored at low temperature overnight. Excess toluene was decanted. The residue was washed with dry diethyl ether and dried under vacuum to obtain a deep yellow viscous compound 2.

[0071] Compound 3: Compound 2 and lithium bis(trifluoromethanesulfonyl)imide LiNTf2 were dissolved in acetonitrile and stirred overnight. The mixture was then diluted with dichloromethane (DCM), washed with deionized water, filtered, concentrated, and vacuum dried to obtain a yellow viscous compound 3, namely [DBU-PEG][NTf2].

[0072] S3. Preparation of RICBEM-based porous liquid adsorbent:

[0073] The synthesized RICBEM was dispersed in methanol and stirred vigorously, followed by sonication to disperse the RICBEM nanoparticles. [DBU-PEG][NTf2] was added to the above RICBEM suspension and stirred to obtain a uniform suspension.

[0074] After drying overnight under vacuum at 80°C, the prepared porous liquid was named RICBEM-based porous liquid and dried under high-temperature vacuum for later use.

[0075] The prepared porous liquid adsorbent 4, as Figure 2 As shown, the porous adsorbent has metal-organic framework nanoparticles 403 inside and surface groups 402 outside, and is uniformly dispersed in heavy ion liquid 401 to form a porous liquid adsorbent 4.

[0076] In this embodiment, the porous liquid adsorbent 4 uses porous solid nanoparticles as pore-forming devices and a dual-cationic ionic liquid as a steric solvent, combining the advantages of the ordered and regular channels of porous solids and the fluidity of liquids. The surface groups are grafted with amine functional groups to amylate the porous liquid material, thereby achieving high selectivity for carbon dioxide. It is a very promising direct air carbon capture material.

[0077] Example 3

[0078] This embodiment provides an application of a porous liquid direct air carbon capture device based on wind-solar hybridization. The device from Example 1 and the absorbent prepared according to the method in Example 2 are used in an island region for direct air carbon capture. Experiments show that using the scheme of this application, the carbon dioxide adsorption capacity of the RICBEM-based porous liquid is 0.51 mmol / g at 1.5 bar. At 10 bar, the carbon dioxide / nitrogen adsorption selectivity (CO2:N2 = 15:85) is 63.2, while the simulated adsorption selectivity of RICBEM is 16.8. Therefore, the metal-organic framework-based porous liquid sacrifices a small portion of its carbon dioxide adsorption capacity, but significantly improves the carbon dioxide / nitrogen adsorption selectivity and provides fluidity. In island regions, the porous liquid can achieve continuous absorption and desorption of carbon dioxide from the air in the device of this embodiment. Simultaneously, the device can fully utilize the abundant local wind energy resources, effectively solving the energy supply problem caused by being far from the power grid, and improving the high carbon emission status of traditional diesel power generation through carbon capture.

[0079] Example 4

[0080] This embodiment provides an application of a porous liquid direct air carbon capture (DAC) device based on wind-solar hybridization. The device from Embodiment 1 and the absorbent medium prepared according to the method in Embodiment 2 are used on a ship for direct air carbon capture. In the ship application scenario, the continuous high wind speed environment at sea can significantly improve the energy capture efficiency of the device, thereby significantly reducing the inherent high energy consumption problem of direct air carbon capture technology. This innovative deployment scheme not only improves the utilization efficiency of renewable energy but also provides a practical and feasible technical path for addressing global climate change.

[0081] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A porous liquid direct air carbon capture device based on wind-solar hybridization, characterized in that, include: A wind-solar hybrid power generation and power supply system (1) is used to provide heat and power to the entire device; The liquid absorption and desorption subsystem (2) uses a porous liquid adsorbent (4) to absorb carbon dioxide from the air. After desorbing and desorbing high concentrations of carbon dioxide, it is transported to the air compression and carbon dioxide collection subsystem (3) for processing. An air compression and carbon dioxide collection subsystem (3) is used for the compression and transport of air and the collection and treatment of high-purity carbon dioxide. The porous liquid adsorbent (4) is circulated through the liquid absorption and desorption subsystem (2) to absorb carbon dioxide and desorb and output high-purity carbon dioxide, thereby realizing the recycling of materials and reducing operating costs.

2. The porous liquid direct air carbon capture device based on wind-solar hybridization according to claim 1, characterized in that, The wind-solar hybrid power generation and power supply system (1) includes a solar thermal photovoltaic integrated module (101), a wind turbine module (102), an inverter (103) and a battery (104) for heating the solution absorption and desorption subsystem (2) and powering the entire system; The wind-solar hybrid power generation and power supply system (1) adopts the maximum absorption operation mode, which uses the electricity generated by the solar thermal photovoltaic integrated module (101) and the wind turbine generator module (102) to power the system using wind and solar resources, and charges the excess electricity to the energy storage; when wind and solar resources are abundant, the excess electricity is used for system heating and appropriate waste disposal; when wind and solar resources are insufficient, the energy storage or backup power supply is called to provide power.

3. The porous liquid direct air carbon capture device based on wind-solar hybridization according to claim 1, characterized in that, The liquid absorption and desorption subsystem (2) includes an absorption tower (201), a pressure reducing valve (202), a heat exchanger (203), a desorption tower (204), a cooler (205), and a circulating pump (206); The absorption tower (201) in the liquid absorption and desorption subsystem (2) is used to absorb carbon dioxide and output air with low concentration of carbon dioxide, while conveying the porous liquid adsorbent (4) that has absorbed carbon dioxide to the pressure reducing valve (202). The pressure reducing valve (202) in the liquid absorption and desorption subsystem (2) is used to reduce the pressure of the porous liquid adsorbent (4) fed into the absorption tower (201) to the stable low pressure required by the heat exchanger (203) and the desorption tower (204) to protect the heat exchanger (203) and the desorption tower (204); The porous liquid adsorbent (4) in the liquid absorption and desorption subsystem (2) is heated by the heat exchanger (203) and then further transported to the desorption tower (204) for carbon dioxide desorption.

4. The porous liquid direct air carbon capture device based on wind-solar hybridization according to claim 3, characterized in that, The cooler (205) is used to cool the desorbed porous liquid adsorbent (4) so ​​that it can enter the circulation pump (206) and eventually return to the absorption tower (201) to realize the recycling of the porous liquid adsorbent (4); The circulating pump (206) is equipped with an agitator.

5. A porous liquid direct air carbon capture device based on wind-solar hybridization according to claim 1, characterized in that, The air compression and carbon dioxide collection subsystem (3) is used for air compression and transportation and high-purity carbon dioxide collection and treatment, including an air compressor (301), a cooler (302) and a carbon dioxide collector (303). The air in the air compression and carbon dioxide collection subsystem (3) is compressed by the air compressor (301), then enters the cooler (302) for cooling, and finally enters the absorption tower (201); The carbon dioxide collector (3) in the air compression and carbon dioxide collection subsystem (3) is used to collect high-purity carbon dioxide blown out of the desorption tower for subsequent processing.

6. The porous liquid direct air carbon capture device based on wind-solar hybridization according to claim 1, characterized in that, The porous liquid adsorbent (4) uses porous solid nanoparticles as pore-forming devices and a dual-cationic ionic liquid as a steric hindrance solvent. The porous liquid adsorbent (4) is composed of metal-organic framework nanoparticles dispersed in a dual-cationic liquid; The porous liquid adsorbent (4) contains metal-organic framework nanoparticles with amine groups on the outer layer to amination the porous liquid.

7. A porous liquid direct air carbon capture device based on wind-solar hybridization according to any one of claims 1-6, characterized in that, The electricity generated by the solar thermal photovoltaic integrated module (101) and the wind turbine (102) is used to heat the absorption tower (201) and the desorption tower (202) via the inverter (103) and the battery (104), and to supply power to the air compressor (206).

8. A method for preparing an absorption medium, comprising preparing a porous adsorbent as described in any one of claims 1-7, characterized in that, The specific steps include the following: S1. Preparation of MOF nanoparticles RICBEM as a porous liquid adsorbent: Tetracarboxylic acid ligand H4ADBTD and copper nitrate trihydrate Cu(NO3)2·3H2O were dissolved in dimethylformamide DMF; After adding fluoroboric acid HBF4 to the above solution and sonicating, the solution was placed in a reaction vessel, heated at 90°C, and cooled multiple times at 3°C / 20min. The green crystals were collected by filtration and washed with dimethylformamide DMF. The product was soaked in methanol, and the supernatant was discarded at intervals. The sample was then treated with acetone and dichloromethane in the same way. It was dried under vacuum at 120°C overnight. The resulting product was RICBEM nanoparticles. S2. Preparation of [DBU-PEG][NTf2] dual-cationic ionic liquid: Compound 1: Dissolve triethylene glycol (TEG) and formyl chloride in dichloromethane (DCM), add potassium hydroxide (KOH) powder to the mixture, and stir at low temperature; Compound 2: 1,8-diazabicyclo[5.4.0]undec-7-ene DBU and Compound 1 were added to dry toluene. The mixture was stirred under nitrogen and stored at low temperature overnight. Excess toluene was decanted. The residue was washed with dry diethyl ether and dried under vacuum to obtain a deep yellow viscous compound 2. Compound 3: Compound 2 and lithium bis(trifluoromethanesulfonyl)imide LiNTf2 were dissolved in acetonitrile and stirred overnight. The mixture was then diluted with dichloromethane (DCM), washed with deionized water, filtered, concentrated, and vacuum dried to obtain a yellow viscous compound 3, i.e., the ionic liquid [DBU-PEG][NTf2]. S3. Preparation of RICBEM-based porous liquid adsorbent: The synthesized RICBEM nanoparticles were dispersed in methanol and stirred vigorously, followed by sonication to further disperse the RICBEM nanoparticles. [DBU-PEG][NTf2] was added to the above RICBEM suspension and stirred to obtain a uniform suspension. After drying overnight under vacuum at 80°C, the prepared porous liquid was named RICBEM-based porous liquid and dried under high-temperature vacuum for later use.

9. An application of a porous liquid direct air carbon capture device based on wind-solar hybridization, characterized in that, The apparatus according to any one of claims 1-7 and the absorbent medium prepared according to claim 8 are used in island areas for direct airborne carbon capture.

10. An application of a porous liquid direct air carbon capture device based on wind-solar hybridization, characterized in that, The apparatus according to any one of claims 1-7 and the absorbent medium prepared according to claim 8 are used on ships for direct air carbon capture.

Images