Temperature-sensitive foamed plastic gel composite adsorbent and preparation method thereof

Abstract

The invention belongs to the technical field of adsorbents for taking water from air, and particularly relates to a temperature-sensitive foamed plastic gel composite adsorbent and a preparation method thereof, and the temperature-sensitive foamed plastic gel composite adsorbent is prepared from the following raw materials: foamed plastic, a monomer, an initiator, a cross-linking agent, an accelerator and lithium chloride; in the process of preparing the temperature-sensitive foamed plastic gel composite adsorbent, the monomers are subjected to polymerization reaction under the action of an initiator and an accelerator and form a cross-linked polymer under the action of a cross-linking agent, and the cross-linked polymer is grafted to the surface of the three-dimensional reticular fiber in the foamed plastic, so that the temperature-sensitive foamed plastic gel composite adsorbent is obtained. Lithium chloride is attached to the surfaces and pores of the foamed plastic and the cross-linked polymer, the temperature-sensitive foamed plastic gel composite adsorbent has excellent moisture absorption performance and good regeneration performance, can be fully desorbed at the low temperature of 40 DEG C, and is simple in preparation flow, stable in process and short in preparation period.

Description

Technical Field

[0001] The invention belongs to the technical field of adsorbents for air water extraction, and specifically relates to a temperature-sensitive foam gel composite adsorbent and a preparation method thereof. Background Art

[0002] Adsorption air water extraction is a technology that uses adsorbent materials to collect water from the atmosphere. It uses highly selective adsorbent materials to absorb water vapor in the air, converting water from gas to liquid to achieve water collection and utilization. In order to achieve efficient water extraction, the adsorbent material usually has a large surface area and good hydrophilicity, which can effectively capture and store water vapor in the air. Compared with other water extraction technologies, adsorption air water extraction technology does not rely on traditional surface water or groundwater sources, so it can be widely used in arid and water-scarce areas. In addition, water vapor in the air is recycled, and adsorption air water extraction technology has the characteristics of sustainable utilization. At the same time, compared with seawater desalination, refrigeration water extraction and other methods, adsorption air water extraction has lower energy consumption and has huge energy-saving benefits. In recent years, adsorption air water extraction technology has been regarded as an effective solution to solve the shortage of fresh water in many regions due to its simple structure, independence from water sources, flexible layout, wide application range, renewability, energy saving and environmental protection, and strong adaptability.

[0003] For adsorption-type air water extraction technology, the adsorption and regeneration performance of the adsorbent has an important impact on the water collection performance of the water extraction system. After searching the prior art, it was found that the composite adsorbent prepared by modifying the polymer with lithium chloride, which has the advantages of strong hygroscopicity, stable performance and non-toxicity, is often used in adsorption-type air water extraction technology. At present, although the adsorption performance of the composite adsorbent has been improved several times after modification with lithium chloride, it still has the following defects:

[0004] First, the adsorption performance of existing composite adsorbents can no longer meet the increasingly high application requirements, and the adsorption performance of composite adsorbents needs to be improved urgently;

[0005] Second, the preparation process of existing composite adsorbents is complicated and tedious, and the process control is difficult, resulting in a high preparation cost of the composite adsorbents;

[0006] Third, the extremely strong hygroscopicity of this lithium chloride modified composite adsorbent makes it difficult to regenerate, and requires a higher regeneration heat source temperature (>75°C) for desorption. The high-temperature desorption process not only consumes a lot of energy, but also relies on expensive heating equipment. As a result, the use of this composite adsorbent has defects such as high energy consumption, high cost of use, strong equipment dependence, and long regeneration cycle of the adsorbent, which greatly limits the application of adsorption air water extraction technology.

[0007] In view of this, providing an adsorbent for air water extraction technology that has good moisture absorption performance, simple preparation process, low cost, and can be regenerated at low temperature is one of the technical problems that technical personnel in this field urgently need to solve. Summary of the invention

[0008] The purpose of the present invention is to provide a thermosensitive foam gel composite adsorbent for air water extraction technology with good moisture absorption performance, simple preparation process, low cost and low-temperature regeneration and a preparation method thereof in response to the above-mentioned technical problems.

[0009] In view of this, the present invention provides a method for preparing a temperature-sensitive foam gel composite adsorbent. The raw materials for preparing the temperature-sensitive foam gel composite adsorbent include:

[0010] Foam, monomer, initiator, cross-linking agent, accelerator and lithium chloride;

[0011] In the process of preparing the thermosensitive foam gel composite adsorbent, the monomer undergoes a polymerization reaction under the action of an initiator and an accelerator, and forms a cross-linked polymer under the action of the cross-linking agent. The cross-linked polymer is grafted to the surface of the three-dimensional network fibers in the foam, and the lithium chloride is attached to the surface and pores of the foam and the cross-linked polymer.

[0012] Furthermore, the preparation method comprises the steps of:

[0013] S1, adding lithium chloride, monomer and cross-linking agent into an appropriate amount of deionized water, stirring until dissolved, to obtain a mixed solution 1;

[0014] S2, adding an accelerator and an initiator to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain a mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, and reacting for 5 minutes to 120 minutes under sealing;

[0015] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried to obtain the temperature-sensitive foam gel composite adsorbent.

[0016] Furthermore, the monomer is selected from one or more of N-isopropylacrylamide and acrylamide.

[0017] Furthermore, the foam is melamine foam, the initiator is ammonium persulfate, the crosslinking agent is N,N'-methylenebisacrylamide, the accelerator is tetramethylethylenediamine, and the thickness of the foam is 1 mm to 10 mm.

[0018] Furthermore, the mixed solution 1 is composed of the following components in percentage by weight: 5% to 30% lithium chloride, 3% to 5% N-isopropylacrylamide, 0.1% to 0.15% acrylamide, 0.067% to 0.089% N,N'-methylenebisacrylamide, and the remainder is deionized water.

[0019] Furthermore, in the second mixed solution, the amount of the accelerator added is 1-6 mL / L; the mass percentage of the initiator is 0.5-1%.

[0020] Furthermore, in step S3, the drying temperature is 40 to 90° C. and the drying time is 2 to 12 hours.

[0021] In addition, the present invention also provides a temperature-sensitive foam-gel composite adsorbent, and the temperature-sensitive foam-gel composite adsorbent is prepared according to the above-mentioned preparation method.

[0022] Furthermore, under the working conditions of a temperature of 20° C. and a relative humidity of 70% RH, the water vapor adsorption capacity of the thermosensitive foam gel composite adsorbent is 0.8 to 2.8 g / g in 3 hours and 1.6 to 3.7 g / g in 12 hours.

[0023] Furthermore, under the desorption conditions of a temperature of 40° C. and a relative humidity of 22% RH, the desorption amount of the thermosensitive foam gel composite adsorbent in 1 hour is greater than 30% of the initial water content, and the desorption amount in 6 hours is greater than 60% of the initial water content.

[0024] Compared with existing adsorbents, the thermosensitive foam gel composite adsorbent of the present invention has the following beneficial effects:

[0025] First, the thermosensitive foam gel composite adsorbent of the present invention has excellent hygroscopic performance, which is greatly improved compared with the melamine foam-lithium chloride composite adsorbent;

[0026] Second, the thermosensitive foam gel composite adsorbent of the present invention has good regeneration performance and can fully desorb at a low temperature of 40°C. In actual use, low-grade thermal energy such as solar energy or industrial waste heat can be used to achieve desorption;

[0027] Third, the preparation process of the thermosensitive foam gel composite adsorbent of the present invention is simple, the process is stable, and the preparation cycle is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a scanning electron microscope image of the surface morphology of the composite adsorbent prepared in Example 1 of the present invention;

[0029] Figure 2 These are the adsorption performance test results of the composite adsorbents prepared in Examples 1 to 3 of the present invention and Comparative Example 1;

[0030] Figure 3 These are the test results of the desorption performance of the composite adsorbents prepared in Examples 1 to 3 of the present invention and Comparative Example 1. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly below in conjunction with specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. The techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0034] A method for preparing a thermosensitive foam gel composite adsorbent, wherein the raw materials for preparing the thermosensitive foam gel composite adsorbent include:

[0035] Foam, monomer, initiator, cross-linking agent, accelerator and lithium chloride;

[0036] The monomer undergoes polymerization reaction under the action of the initiator and the accelerator, and forms a cross-linked polymer under the action of the cross-linking agent. The cross-linked polymer is grafted to the surface of the three-dimensional network fiber in the foam, and the lithium chloride is attached to the surface and pores of the foam and the cross-linked polymer.

[0037] Furthermore, the preparation method comprises the steps of:

[0038] S1, adding lithium chloride, monomer and cross-linking agent into an appropriate amount of deionized water, stirring until dissolved, to obtain a mixed solution 1;

[0039] S2, adding an accelerator and an initiator to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain a mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, and reacting for 5 minutes to 120 minutes under sealing;

[0040] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried to obtain the temperature-sensitive foam gel composite adsorbent.

[0041] Preferably, the monomer is selected from one or more of N-isopropylacrylamide and acrylamide.

[0042] More preferably, the monomers include N-isopropylacrylamide and acrylamide.

[0043] Preferably, the foam is melamine foam.

[0044] Preferably, the thickness of the foam is 1 mm to 10 mm.

[0045] Preferably, the initiator is ammonium persulfate.

[0046] Preferably, the cross-linking agent is N,N'-methylenebisacrylamide.

[0047] Preferably, the accelerator is tetramethylethylenediamine.

[0048] It should be noted that the surface treatment in step S3 of the present invention refers to removing unreacted monomers, impurities and other substances in the melamine foam by washing with water, filtering and the like.

[0049] Furthermore, the mixed solution 1 is composed of the following components in percentage by weight: 5% to 30% lithium chloride, 3% to 5% N-isopropylacrylamide, 0.1% to 0.15% acrylamide, 0.067% to 0.089% N,N'-methylenebisacrylamide, and the remainder is deionized water.

[0050] Preferably, in step S1, lithium chloride, monomers, and cross-linking agents are added to an appropriate amount of deionized water, and stirred for 5 to 30 minutes to fully dissolve the additives to obtain a mixed solution 1;

[0051] Furthermore, in the second mixed solution, the amount of accelerator tetramethylethylenediamine added is 1-6 mL / L; the mass percentage of initiator ammonium persulfate is 0.5-1%.

[0052] Furthermore, in step S3, the drying temperature is 40 to 90° C. and the drying time is 2 to 12 hours.

[0053] Furthermore, under the working conditions of a temperature of 20° C. and a relative humidity of 70% RH, the water vapor adsorption capacity of the thermosensitive foam gel composite adsorbent is 0.8 to 2.8 g / g in 3 hours and 1.6 to 3.7 g / g in 12 hours.

[0054] Furthermore, under the desorption conditions of a temperature of 40° C. and a relative humidity of 22% RH, the desorption amount of the thermosensitive foam gel composite adsorbent in 1 hour is greater than 30% of the initial water content, and the desorption amount in 6 hours is greater than 60% of the initial water content.

[0055] In the thermosensitive foam gel composite adsorbent of the present invention, the monomers N-isopropylacrylamide and acrylamide are polymerized into PNIPAM and PAM under the action of an initiator, and at the same time, a cross-linked polymer is formed under the action of a cross-linking agent and grafted to the surface of the three-dimensional mesh fiber of the melamine foam, and lithium chloride is attached to the surface and pores of the melamine foam and the polymer. In this composite adsorbent, on the one hand, the hygroscopicity of the material is improved by the addition of lithium chloride, and at the same time, the low-temperature regeneration performance (such as 40°C) is achieved by the grafted poly N-isopropylacrylamide (PNIPAM) (phase transition temperature of 30-35°C), and the corrosion risk of lithium chloride to the metal substrate is reduced; on the other hand, the process does not involve operations such as heating and pressurization, and the preparation process is simple and the preparation cycle is short.

[0056] Compared with existing adsorbents, the thermosensitive foam gel composite adsorbent of the present invention has the following beneficial effects:

[0057] Second, the thermosensitive foam gel composite adsorbent of the present invention has excellent hygroscopic properties, which is significantly improved compared with the melamine foam-lithium chloride composite adsorbent;

[0058] Second, the thermosensitive foam gel composite adsorbent of the present invention has good regeneration performance and can fully desorb at a low temperature of 40°C. In actual use, low-grade thermal energy such as solar energy or industrial waste heat can be used to achieve desorption;

[0059] Third, the preparation process of the thermosensitive foam gel composite adsorbent of the present invention is simple, the process is stable, and the preparation cycle is short.

[0060] The thermosensitive foam gel composite adsorbent and its preparation method of the present invention are illustrated by specific examples as follows:

[0061] Example 1

[0062] S1, adding lithium chloride, monomers, and crosslinking agents to an appropriate amount of deionized water, stirring for 5 minutes to fully dissolve the additives, and obtaining a mixed solution 1; wherein the mixed solution 1 is composed of the following components in percentage by weight: 5% lithium chloride, 3% N-isopropylacrylamide, 0.1% acrylamide, 0.067% N,N'-methylenebisacrylamide, and the balance is deionized water;

[0063] S2, adding accelerator tetramethylethylenediamine and initiator ammonium persulfate to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, the thickness of the foam is 10 mm, and reacting for 5 minutes under sealing; in the mixed solution 2, the amount of the accelerator added is 1 mL / L; the mass percentage of the initiator is 0.5%;

[0064] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried at 40° C. for 2 hours to obtain the thermosensitive foam gel composite adsorbent.

[0065] Example 2

[0066] S1, adding lithium chloride, monomers, and crosslinking agents to an appropriate amount of deionized water, stirring for 15 minutes to fully dissolve the additives, and obtaining a mixed solution 1; wherein the mixed solution 1 is composed of the following components in percentage by weight: 20% lithium chloride, 4% N-isopropylacrylamide, 0.13% acrylamide, 0.075% N,N'-methylenebisacrylamide, and the balance is deionized water;

[0067] S2, adding tetramethylethylenediamine as an accelerator and ammonium persulfate as an initiator to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain a mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, the thickness of the foam is 10 mm, and reacting for 50 minutes under sealing; in the mixed solution 2, the amount of the accelerator added is 3 mL / L; the mass percentage of the initiator is 0.8%;

[0068] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried at 70° C. for 8 hours to obtain the thermosensitive foam gel composite adsorbent.

[0069] Example 3

[0070] S1, adding lithium chloride, monomers, and crosslinking agents to an appropriate amount of deionized water, stirring for 30 minutes to fully dissolve the additives, and obtaining a mixed solution 1; wherein the mixed solution 1 is composed of the following components in percentage by weight: 30% lithium chloride, 5% N-isopropylacrylamide, 0.15% acrylamide, 0.089% N,N'-methylenebisacrylamide, and the balance is deionized water;

[0071] S2, adding accelerator tetramethylethylenediamine and initiator ammonium persulfate to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, the thickness of the foam is 10 mm, and reacting for 120 minutes under sealing; in the mixed solution 2, the amount of the accelerator added is 6 mL / L; the mass percentage of the initiator is 1%;

[0072] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried at 90° C. for 12 hours to obtain the thermosensitive foam gel composite adsorbent.

[0073] Example 4

[0074] S1, adding lithium chloride, monomers, and crosslinking agents to an appropriate amount of deionized water, stirring for 30 minutes to fully dissolve the additives, and obtaining a mixed solution 1; wherein the mixed solution 1 is composed of the following components in percentage by weight: 10% lithium chloride, 5% N-isopropylacrylamide, 0.15% acrylamide, 0.089% N,N'-methylenebisacrylamide, and the balance is deionized water;

[0075] S2, adding accelerator tetramethylethylenediamine and initiator ammonium persulfate to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, the thickness of the foam is 1 mm, and reacting for 120 minutes under sealing; in the mixed solution 2, the amount of the accelerator added is 6 mL / L; the mass percentage of the initiator is 1%;

[0076] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried at 90° C. for 12 hours to obtain the thermosensitive foam gel composite adsorbent.

[0077] Comparative Example 1

[0078] S1, adding lithium chloride to an appropriate amount of deionized water, stirring for 15 minutes to fully dissolve the additive, and obtaining a mixed solution 1; wherein the mixed solution 1 is composed of the following components in percentage by weight: 20% lithium chloride and the balance deionized water;

[0079] S2, pouring the mixed solution into a mold filled with melamine foam, the thickness of the foam is 10 mm, and reacting for 50 minutes under sealing;

[0080] S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried at 70° C. for 8 hours to obtain the thermosensitive foam gel composite adsorbent.

[0081] Test Example 1

[0082] Surface topography inspection:

[0083] The microscopic surface morphology of Example 2 was observed and tested by a GeminiSEM500 scanning electron microscope (SEM) from Zeiss, UK. Figure 1 .

[0084] Test Example 2

[0085] Adsorption performance test:

[0086] The relative humidity and temperature conditions of the adsorption performance test are precisely controlled by a constant temperature and humidity chamber. Before the adsorption experiment begins, the composite adsorbents obtained in Examples 1 to 4 and Comparative Example 1 are placed in an 85°C oven for drying for 8 hours to obtain the mass of each sample in a dry state. Afterwards, the dried samples are placed in a constant temperature and humidity chamber for adsorption experiments. The mass of the composite adsorbent at a certain interval is weighed with an electronic dry balance, and the water vapor adsorption of the composite adsorbent, i.e., the water absorption rate, is calculated. Water absorption rate = (m 吸水后 -m 吸水前 ) / m 吸水前 During the test, the adsorption temperature was set at 20°C and the relative humidity was 70% RH. The adsorption was carried out for 12 hours. The experimental results are shown in Figure 2 .

[0087] It was measured that the water vapor adsorption capacity of the composite adsorbents obtained in Examples 1 to 4 at 3h was 0.87g / g, 1.05g / g, 1.23g / g, and 2.74g / g, respectively; the adsorption capacity at 12h was 1.68g / g, 2.05g / g, 2.46g / g, and 3.68g / g, respectively; the water vapor adsorption capacity of the composite adsorbent obtained in Control Example 1 at 3h and 12h was 0.66g / g and 1.45g / g, respectively.

[0088] Test Example 3

[0089] Desorption performance test:

[0090] The relative humidity and temperature conditions of the desorption performance test are precisely controlled by another constant temperature and humidity chamber, and the desorption conditions are set to a temperature of 40°C and a relative humidity of 22% RH. To ensure the accuracy of the experimental data, two constant temperature and humidity chambers are used simultaneously. Before starting the desorption performance experiment, the composite adsorbent samples obtained in Examples 1 to 4 and Control Example 1 were placed in a constant temperature and humidity chamber with a working condition of 20°C and a relative humidity of 70% RH for adsorption for 12 hours. Immediately thereafter, they were placed in another constant temperature and humidity chamber that had reached the desorption condition in advance, and the desorption performance experiment was started. During the experiment, an electronic balance was used to weigh the mass of the adsorbent at certain intervals. The value obtained minus the initial weight of each sample is the amount of water remaining in the adsorbent, and the change in the water absorption rate of the adsorbent over time is calculated. The experimental results are shown in Figure 3 .

[0091] Depend on Figure 3 It can be seen that under the desorption conditions of desorption temperature 40°C and relative humidity 22%RH, after desorption for 1h and 6h, the amount of water remaining in the adsorbent of Example 1 was 1.11g / g and 0.51g / g, respectively, accounting for 60% and 27% of the initial water content of desorption, respectively; the amount of water remaining in the adsorbent of Example 2 was 1.63g / g and 0.87g / g, respectively, accounting for 73% and 39% of the initial water content of desorption, respectively; the amount of water remaining in the adsorbent of Example 3 was 1.37g / g and 0.84g / g, respectively, accounting for 65% and 40% of the initial water content of desorption, respectively; the amount of water remaining in the adsorbent of Example 4 was 1.15g / g and 1.07g / g, respectively, accounting for 31% and 29% of the initial water content of desorption, respectively; the residual water content of Control Example 1 at the corresponding desorption time was 1.21g / g and 0.79g / g, accounting for 83% and 54% of the initial water content of desorption, respectively. It can be found that within the same desorption time, the desorption rates and desorption amounts of Examples 1 to 4 are better than those of Control Example 1.

[0092] Through the adsorption performance test and the desorption performance test, it can be known that the thermosensitive foam gel composite adsorbent obtained by the present invention has both high adsorption and 40°C low-temperature regeneration performance.

[0093] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for preparing a thermosensitive foam gel composite adsorbent, It is characterized in that The raw materials for preparing the thermosensitive foam gel composite adsorbent include: Foam, monomer, initiator, cross-linking agent, accelerator and lithium chloride; In the process of preparing the thermosensitive foam gel composite adsorbent, the monomer undergoes a polymerization reaction under the action of an initiator and an accelerator, and forms a cross-linked polymer under the action of the cross-linking agent. The cross-linked polymer is grafted to the surface of the three-dimensional network fibers in the foam, and the lithium chloride is attached to the surface and pores of the foam and the cross-linked polymer.

2. The method for preparing the thermosensitive foam gel composite adsorbent according to claim 1, It is characterized in that The preparation method comprises the steps of: S1, adding lithium chloride, monomer and cross-linking agent into an appropriate amount of deionized water, stirring until dissolved, to obtain a mixed solution 1; S2, adding an accelerator and an initiator to the mixed solution 1 obtained in step S1, stirring to make the mixture uniform to obtain a mixed solution 2, pouring the mixed solution 2 into a mold filled with melamine foam, and reacting for 5 minutes to 120 minutes under sealing; S3, after the reaction is completed, the melamine foam is taken out, surface treated, and then dried to obtain the temperature-sensitive foam gel composite adsorbent.

3. The method for preparing the thermosensitive foam gel composite adsorbent according to claim 2, It is characterized in that The monomer is selected from one or more of N-isopropylacrylamide and acrylamide.

4. The method for preparing the thermosensitive foam gel composite adsorbent according to claim 3, It is characterized in that The foam is melamine foam, the initiator is ammonium persulfate, the crosslinking agent is N,N'-methylenebisacrylamide, the accelerator is tetramethylethylenediamine, and the thickness of the foam is 1 mm to 10 mm.

5. The method for preparing the thermosensitive foam gel composite adsorbent according to claim 4, It is characterized in that The mixed solution 1 is composed of the following components in percentage by weight: 5% to 30% lithium chloride, 3% to 5% N-isopropylacrylamide, 0.1% to 0.15% acrylamide, 0.067% to 0.089% N,N'-methylenebisacrylamide, and the remainder is deionized water.

6. The method for preparing the thermosensitive foam gel composite adsorbent according to claim 2, It is characterized in that In the second mixed solution, the added amount of the accelerator is 1-6 mL / L; the mass percentage of the initiator is 0.5-1%.

7. The method for preparing the thermosensitive foam gel composite adsorbent according to claim 2, It is characterized in that In step S3, the drying temperature is 40-90° C. and the drying time is 2-12 hours.

8. The thermosensitive foam gel composite adsorbent prepared by the preparation method according to any one of claims 1 to 7.

9. The thermosensitive foam gel composite adsorbent according to claim 8, It is characterized in that Under the working conditions of temperature of 20° C. and relative humidity of 70% RH, the water vapor adsorption capacity of the thermosensitive foam gel composite adsorbent is 0.8-2.8 g / g in 3 hours and 1.6-3.7 g / g in 12 hours.

10. The thermosensitive foam gel composite adsorbent according to claim 8, It is characterized in that Under the desorption conditions of temperature 40° C. and relative humidity 22% RH, the desorption amount of the thermosensitive foam gel composite adsorbent in 1 hour is greater than 30% of the initial water content, and the desorption amount in 6 hours is greater than 60% of the initial water content.

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