Preparation method of atmospheric water collection porous gel

Abstract

The invention discloses a preparation method of atmospheric water collection porous gel, and belongs to the technical field of environmental ecological restoration, the method comprises the following steps: S1, dissolving a monomer, a foam stabilizer and a foaming aid in an acidic solution, and stirring to form a solution A; s2, mixing N, N '-methylene bisacrylamide, tetramethylethylenediamine and an initiator with the solution A to form a solution B; s3, mixing and stirring a foaming agent and the solution B, and standing for reaction to form a substrate C; s4, drying the matrix C, and immersing the matrix C into the solution D for reaction to form a precursor E; and S5, drying the precursor E to obtain the atmospheric water collection porous gel material. The problems that in the prior art, the preparation process is complex, and the foaming process is uncontrollable are solved.

Description

Technical Field

[0001] The invention relates to the technical field of environmental ecological restoration, and in particular to a method for preparing an atmospheric water-collecting porous gel. Background Art

[0002] Atmospheric adsorption water collection is a new way to solve the shortage of water resources. The global atmosphere contains about 1.29 trillion tons of water vapor, which is 6 times the amount of water in the world's rivers. In addition, the migration of atmospheric moisture is not restricted by geographical location. Even in extremely arid desert areas, about 5% of atmospheric moisture can be collected and utilized. Different from fog collection technology and condensation technology, atmospheric adsorption water collection technology can spontaneously adsorb water vapor from the air and store it without additional energy input without space and time restrictions, and has broader application prospects. Among them, atmospheric water collection materials are the key to achieving adsorption water collection.

[0003] In order to increase the adsorption capacity and accelerate the adsorption kinetics, the existing atmospheric water collection materials often rely on porous gel structures to provide rich pore structures and large specific surface areas. However, the preparation of porous atmospheric water collection gels is often carried out by freeze drying. Since freeze drying requires freezing the material in a low temperature environment in advance, and then using a vacuum pump to extract vacuum to accelerate the sublimation of ice, the whole process consumes a lot of energy, which increases the cost of material preparation. At the same time, limited by the volume of the freeze drying equipment, the number of porous atmospheric water collection gels that can be prepared in a single batch is small. And the sublimation process of ice takes a long time, and the sublimation interface advances downward at a speed of about 1mm per hour. Therefore, the preparation method of porous atmospheric water collection gel based on freeze drying greatly increases the production cost of atmospheric water collection gel, limits production efficiency, and the pore size of the preparation process of porous materials is uncontrollable. The Chinese patent with publication number CN118063839A discloses a method for preparing a macroporous hydrogel, which uses hydroxyethyl cellulose, carbon nanotubes and polyvinyl alcohol to form a gel by freeze drying for 48 hours, and then prepares it into an atmospheric water collection material by loading LiCl. However, this method relies on the formation of a pore structure during the freeze drying process, and the preparation cost is relatively high. The Chinese patent with publication number CN117582934A discloses a method for preparing an atmospheric water adsorption polymer material, wherein an adsorbent such as sodium carboxymethyl cellulose is dissolved in water and freeze-dried for 8-12 hours to form a film, which is then placed in a solution such as LiCl or CaCl2 for a static reaction, and finally freeze-dried for 8-12 hours to form an atmospheric water adsorption polymer material. This preparation method requires two freeze-drying processes, and each freeze-drying process requires 8-12 hours of freeze-drying time, which greatly increases production costs and reduces production efficiency. Summary of the invention

[0004] The invention provides a method for preparing an atmospheric water-collecting porous gel, which solves the problems of complex preparation process and uncontrollable foaming process in the prior art.

[0005] Existing foaming materials generally form a pore structure by freeze drying. This method has high preparation cost and is not easy to control the pore size. In order to solve the above problems, this scheme provides a preparation method of atmospheric water collection porous gel as follows, comprising the following steps: S1, dissolving the monomer, foam stabilizer and foaming aid in an acidic solution and stirring to form a solution A; S2, N, N'-methylenebisacrylamide, tetramethylethylenediamine and initiator are mixed with solution A to form solution B; S3, mixing the foaming agent and solution B, and allowing to stand for reaction to form matrix C; S4, drying the substrate C and immersing it in the solution D to react and form the precursor E; S5, drying the precursor E to obtain an atmospheric water collection porous gel material; The monomer is selected from any one or more combinations of acrylamide, acrylic acid, N-isopropylacrylamide or N,N-dimethylacrylamide; The solution D is selected from any one or more of aqueous solutions of calcium chloride, lithium chloride, magnesium chloride, magnesium sulfate, lithium bromide or polypyrrole chloride.

[0006] In this scheme, the hydrophilic monomer, foam stabilizer, foaming aid and other reaction raw materials are first dissolved in an acidic solution, and the acid is used to inhibit the decomposition of the initiator and suspend the polymerization reaction. Then, an alkaline foaming agent is combined with a foam stabilizer and a foaming aid, and the polymerization reaction is initiated while foaming under the catalysis of N,N'-methylenebisacrylamide and tetramethylethylenediamine and the action of the initiator, so that the foaming process and the polymerization process are carried out simultaneously to prepare an atmospheric water collection porous gel. The foam stabilizer is used to stabilize the foam, so that the generated foam is not easy to break, and small bubbles will not polymerize to form large bubbles, which is conducive to maintaining the foam pore size. The foaming aid is used to produce more foam. By selectively adding a foam stabilizer and a foaming aid, the synergistic effect of the two can adjust the pore size structure of the material.

[0007] Calcium chloride, lithium chloride, magnesium chloride, magnesium sulfate, lithium bromide or polypyrrole chloride has the function of collecting water and absorbing moisture, and can be attached to the gel carrier, which is conducive to the dispersion of salt crystals. The porous gel carrier improves the interaction between atmospheric water and Ca 2+ and Li + The contact area allows more atmospheric water to be captured by the hygroscopic components.

[0008] Preferably, the acidic solution in step S1 is any one of acetic acid solution, hydrochloric acid solution or formic acid solution.

[0009] Preferably, the foam stabilizer in step S1 comprises any one or a combination of polyoxyethylene-polyoxypropylene ether block copolymer or poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) block copolymer.

[0010] The foam stabilizer is selected from any one or a combination of two of Pluronic F-127, Pluronic F-68, Kolliphor P-188 or Synperonic F-108.

[0011] Preferably, the foaming aid in step S1 includes any one or more combinations of sodium dodecyl sulfate, sodium dodecyl sulfonate or sodium polyoxyethylene fatty alcohol sulfate.

[0012] Preferably, the initiator in step S2 is selected from ammonium persulfate or potassium persulfate.

[0013] Preferably, the step S2 comprises: firstly mixing the auxiliary gelling substance with solution A, and then mixing with N,N'-methylenebisacrylamide, tetramethylethylenediamine and an initiator to form solution B.

[0014] Preferably, the auxiliary gel material is any one or more combinations of sodium carboxymethyl cellulose, chitosan, sodium alginate, maltodextrin, starch, agar or gelatin.

[0015] Preferably, the foaming agent in step S3 is any one of sodium bicarbonate and potassium bicarbonate.

[0016] By combining an alkaline foaming agent with a foam stabilizer and a foaming aid, a polymerization reaction is initiated while foaming, so that the foaming process and the polymerization process are carried out simultaneously to prepare an atmospheric water collection porous gel.

[0017] Preferably, the monomer concentration is in the range of 0.1 g / mL to 2 g / mL, the foam stabilizer concentration is in the range of 0.001 g / mL to 0.01 g / mL, the pH of the acidic solution is ≤1, the foaming aid concentration is in the range of 0.001 g / mL to 0.05 g / mL, the initiator concentration is in the range of 0.01 to 0.05 g / mL, and the foaming agent addition amount is in the range of 0.05 g / mL to 1 g / mL; the reaction time in step S4 is greater than or equal to 24 hours.

[0018] The foaming intensity is controlled by optimizing the amount of the foaming agent, the concentration of the foam stabilizer and the foaming aid, and the atmospheric water-collecting porous gel with different pore sizes and structures is prepared.

[0019] Preferably, the drying process of the substrate C is any one of oven drying, vacuum drying and ethanol dehydration drying.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The reaction system of the present invention is simple and inexpensive, and does not involve a high-cost freeze-drying process, thereby reducing the preparation cost of the atmospheric water-collecting gel material. Compared with the traditional method, the present invention efficiently prepares the atmospheric water-collecting material in a simple foaming manner, does not involve a freeze-drying process, and aims to provide a low-cost, high-efficiency, and scalable atmospheric water-collecting material preparation method.

[0021] The method for preparing the atmospheric water-collecting porous gel of the present invention can control the foaming intensity by adjusting the amount of the foaming agent, the concentration of the foam stabilizer and the foaming aid, and is expected to prepare atmospheric water-collecting porous gels with different pore sizes and structures.

[0022] The method for preparing the atmospheric water-collecting porous gel of the present invention does not involve a freeze-drying process and is therefore not limited by the volume limitation of freeze-drying equipment, and is expected to form a large-scale and efficient industrial preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 The present invention is a flow chart for preparing the atmospheric water collection porous gel.

[0024] Figure 2 This is the morphology of the atmospheric water-collecting porous gel prepared in Examples 1-5.

[0025] Figure 3 This is the Fourier infrared spectrum of the atmospheric water collection porous gel prepared in Example 3.

[0026] Figure 4 It is the 24-hour water collection amount and saturated water collection capacity of the atmospheric water-collecting porous gel prepared in Examples 1-5. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. The illustrative embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0028] In order to solve the problems of uncontrollable pore size and complex process in the prior art, this scheme first dissolves the reaction raw materials such as monomers, foam stabilizers and foaming aids in an acidic solution, uses the acid to inhibit the decomposition of the initiator and suspend the polymerization reaction, and then uses an alkaline foaming agent in combination with the foam stabilizer and the foaming aid to initiate the polymerization reaction while foaming, so that the foaming process and the polymerization process are carried out simultaneously to prepare an atmospheric water collection porous gel.

[0029] The present invention provides a method for preparing an atmospheric water-collecting porous gel, comprising the following steps: S1, dissolving the monomer, foam stabilizer and foaming aid in an acidic solution and stirring to form a solution A; In the embodiment shown, the acidic solution is an acetic acid solution, but the acidic solution may also be selected from any one of a hydrochloric acid solution and a formic acid solution.

[0030] In the embodiment shown, the foam stabilizer is selected from Pluronic F-127 or Synperonic F-108, however, the foam stabilizer may also be selected from Pluronic F-68 or Kolliphor P-188.

[0031] In the illustrated embodiment, the foaming aid in step S1 includes sodium dodecyl sulfate, but the foaming aid may also be selected from any one or more combinations of sodium dodecyl sulfonate or sodium polyoxyethylene fatty alcohol sulfate.

[0032] In the embodiment shown, the monomer concentration is in the range of 0.1 g / mL to 2 g / mL, the foam stabilizer concentration is in the range of 0.001 g / mL to 0.01 g / mL, the pH of the acidic solution is ≤1, and the foaming aid concentration is in the range of 0.001 g / mL to 0.05 g / mL; S2, N, N'-methylenebisacrylamide, tetramethylethylenediamine and initiator are mixed with solution A to form solution B; In the embodiment shown, the initiator in step S2 is selected from potassium persulfate, however, the initiator may also be selected from ammonium persulfate.

[0033] In the embodiment shown, the step S2 may further include adding an auxiliary gelling substance, including: first mixing the auxiliary gelling substance with solution A, and then mixing with N,N'-methylenebisacrylamide, tetramethylethylenediamine and an initiator to form solution B.

[0034] In the embodiment shown, the auxiliary gel material is sodium carboxymethyl cellulose or sodium alginate, but the auxiliary gel material can also be selected from any one or more combinations of chitosan, maltodextrin, starch, agar or gelatin.

[0035] In the embodiment shown, the initiator concentration is 0.25 g / mL, however, the initiator concentration can range from 0.01 to 0.05 g / mL.

[0036] S3, mixing the foaming agent and solution B, and allowing to stand for reaction to form matrix C; In the embodiment shown, the foaming agent in step S3 is sodium bicarbonate, however, the foaming agent may also be selected from potassium bicarbonate, and the amount of the foaming agent added is in the range of 0.05 g / mL to 1 g / mL; S4, drying the substrate C and immersing it in the solution D to react and form the precursor E; The drying process of the matrix C is any one of oven drying, vacuum drying and ethanol dehydration drying. The solution D in step S4 is an aqueous solution of calcium chloride, but the solution D can also be selected from any one or more of an aqueous solution of lithium chloride, magnesium chloride, magnesium sulfate, lithium bromide or polypyrrole chloride. The reaction time in step S4 is greater than or equal to 24 hours.

[0037] S5, drying the precursor E to obtain an atmospheric water collection porous gel material; The present solution is explained below with reference to specific embodiments.

[0038] Example 1

[0039] 5 mL of acetic acid and 5 mL of deionized water were mixed to form an acidic solution, and then 5 g of acrylamide was dissolved in the acidic solution to form solution A.

[0040] Solution B was formed by dissolving 0.01 g of N,N'-methylenebisacrylamide, 200 μL of tetramethylethylenediamine, and 500 μL of 0.25 g / mL potassium persulfate solution in solution A.

[0041] Pour 0.35 g of sodium bicarbonate into solution B, stir rapidly for 5 seconds, and then let the reaction stand to wait for the foaming to complete.

[0042] After foaming, the gel was immersed in deionized water for 1 hour to remove unreacted substances, and then the gel was placed in 75%, 90% and 100% ethanol for 1 hour in sequence to complete dehydration and drying.

[0043] The dried gel was immersed in a 0.4 g / mL CaCl2 solution for 24 hours and then dried in an oven at 70°C for 24 hours to obtain an atmospheric water-collecting porous gel.

[0044] The prepared atmospheric water-collecting porous gel was tested for its water-collecting capacity in a real air environment (relative humidity of about 80% and temperature of about 28°C). The gel can collect 0.47 g / g of water within 24 hours. The atmospheric water-collecting saturation capacity is about 0.92 g / g.

[0045] Example 2

[0046] 5 mL of acetic acid and 5 mL of deionized water were mixed to form an acidic solution, and then 5 g of acrylamide and 0.05 g of Synperonic F-108 were dissolved in the acidic solution to form solution A.

[0047] Solution B was formed by dissolving 0.01 g of N,N'-methylenebisacrylamide, 200 μL of tetramethylethylenediamine, and 500 μL of 0.25 g / mL potassium persulfate solution in solution A.

[0048] Pour 0.35 g of sodium bicarbonate into solution B, stir rapidly for 5 seconds, and then let the reaction stand to wait for the foaming to complete.

[0049] After foaming, the gel was immersed in deionized water for 1 hour to remove unreacted substances, and then the gel was placed in 75%, 90% and 100% ethanol for 1 hour in sequence to complete dehydration and drying.

[0050] The dried gel was immersed in a 0.4 g / mL CaCl2 solution for 24 hours and then dried in an oven at 70°C for 24 hours to obtain an atmospheric water-collecting porous gel.

[0051] The prepared atmospheric water-collecting porous gel was tested for its water-collecting capacity in a real air environment (relative humidity of about 80% and temperature of about 28°C). The gel can collect 0.72 g / g of water within 24 hours. The atmospheric water-collecting saturation capacity is about 1.13 g / g.

[0052] Example 3

[0053] 5 mL of acetic acid and 5 mL of deionized water were mixed to form an acidic solution, and then 5 g of acrylamide, 0.05 g of Synperonic F-108 and 0.01 g of sodium dodecyl sulfate were dissolved in the acidic solution to form solution A.

[0054] Solution B was formed by dissolving 0.01 g of N,N'-methylenebisacrylamide, 200 μL of tetramethylethylenediamine, and 500 μL of 0.25 g / mL potassium persulfate solution in solution A.

[0055] Pour 1g of sodium bicarbonate into solution B, stir rapidly for 5 seconds, and then let the reaction stand to wait for the foaming to complete.

[0056] After foaming, the gel was immersed in deionized water for 1 hour to remove unreacted substances, and then the gel was placed in 75%, 90% and 100% ethanol for 1 hour in sequence to complete dehydration and drying.

[0057] The dried gel was immersed in a 0.4 g / mL CaCl2 solution for 24 hours and then dried in an oven at 70°C for 24 hours to obtain an atmospheric water-collecting porous gel.

[0058] The prepared atmospheric water-collecting porous gel was tested for its water-collecting capacity in a real air environment (relative humidity of about 80% and temperature of about 28°C). The gel can collect 0.87 g / g of water within 24 hours. The atmospheric water-collecting saturation capacity is about 1.35 g / g.

[0059] Example 4

[0060] like Figure 1 The figure shows the preparation flow chart of the atmospheric water collection porous gel of this embodiment. 5 mL of acetic acid and 5 mL of deionized water are mixed to form an acidic solution, and then 5 g of acrylamide, 0.05 g of Synperonic F-108 and 0.01 g of sodium dodecyl sulfate are dissolved in the acidic solution to form solution A.

[0061] 0.1 g of sodium carboxymethyl cellulose was dissolved in 5 mL of deionized water, and then added to solution A and stirred evenly. Then, 0.01 g of N,N'-methylenebisacrylamide, 200 μL of tetramethylethylenediamine and 500 μL of 0.25 g / mL potassium persulfate solution were added to form solution B.

[0062] Pour 0.35 g of sodium bicarbonate into solution B, stir rapidly for 5 seconds, and then let the reaction stand to wait for the foaming to complete.

[0063] After the foaming was completed, the gel was immersed in deionized water for 1 hour to remove the unreacted substances, and then the gel was placed in a 70°C oven to dry for 24 hours.

[0064] The dried gel was immersed in a 0.4 g / mL CaCl2 solution for 24 hours and then dried in an oven at 70°C for 24 hours to obtain an atmospheric water-collecting porous gel.

[0065] The prepared atmospheric water-collecting porous gel was tested for its water-collecting capacity in a real air environment (relative humidity of about 80% and temperature of about 28°C). The gel can collect 0.74 g / g of water within 24 hours. The atmospheric water-collecting saturation capacity is about 1.18 g / g.

[0066] Example 5

[0067] 5 mL of acetic acid and 5 mL of deionized water were mixed to form an acidic solution, and then 5 g of acrylamide and 0.05 g of Pluronic F-127 were dissolved in the acidic solution to form solution A.

[0068] 0.1 g of sodium alginate was dissolved in 5 mL of deionized water, and then added to solution A and stirred evenly. Then, 0.01 g of N,N'-methylenebisacrylamide, 200 μL of tetramethylethylenediamine and 500 μL of 0.25 g / mL potassium persulfate solution were added to form solution B.

[0069] Pour 0.35 g of sodium bicarbonate into solution B, stir rapidly for 5 seconds, and then let the reaction stand to wait for the foaming to complete.

[0070] After the foaming was completed, the gel was immersed in deionized water for 1 hour to remove the unreacted substances, and then the gel was placed in a 70°C oven to dry for 24 hours.

[0071] The dried gel was immersed in a 0.4 g / mL CaCl2 solution for 24 hours and then dried in an oven at 70°C for 24 hours to obtain an atmospheric water-collecting porous gel.

[0072] The prepared atmospheric water-collecting porous gel was tested for its water-collecting capacity in a real air environment (relative humidity of about 80% and temperature of about 28°C). The gel can collect 0.64 g / g of water within 24 hours. The atmospheric water-collecting saturation capacity is about 1.14 g / g.

[0073] The porous gel matrix before loading CaCl2 prepared in Comparative Examples 1-3 is as follows: Figure 2 As shown, in the preparation process of Example 1, no foam stabilizer and foaming aid were added, so the foaming was weak, and the prepared porous gel matrix had a small volume and a density of about 0.94 g / cm 3 In Example 2, due to the addition of a foam stabilizer (without a foaming aid), more small bubbles are retained during the foaming process, and the density of the prepared porous gel matrix is ​​reduced to about 0.80 g / cm 3 In Example 3, a foaming aid, sodium dodecyl sulfate, was further added to Example 2, and the amount of sodium bicarbonate added was increased from 0.35 g to 1 g. Therefore, the foaming effect was further improved, and the morphology of the porous gel matrix was also changed. The density of the porous gel matrix prepared in Example 3 was about 0.77 g / cm 3 .according to Figure 3 It can be seen from the infrared spectrum that the atmospheric water collection porous gel synthesized by the present invention has a peak at 1419 cm -1 , 1458cm -1 , 1564cm -1 and 1684cm -1 There are strong absorption peaks at 3405cm, which correspond to CN stretching vibration, CH bending vibration, amide II band and amide I band in polyacrylamide, respectively, indicating that the atmospheric water collection porous gel synthesized by the present invention is mainly composed of polyacrylamide. Since the atmospheric water collection porous gel contains CaCl2 hygroscopic salt, it can quickly absorb and store moisture in the atmosphere, resulting in the difficulty of removing bound water in the atmospheric water collection porous gel, making the infrared spectrum at 3405cm -1The peaks appear, corresponding to the amide groups in the hydrated state, proving that the atmospheric water collection porous gel of the present invention can effectively bind water molecules in the atmosphere. In Examples 4-5, gel auxiliary substances were added. Due to the lack of foaming aids, the gel obtained in Example 5 was relatively small. Figure 4 As shown, from the perspective of atmospheric water collection effect, due to weak foaming, Example 1 has a 24-hour water collection capacity of 0.47g / g and a saturated water collection capacity of 0.92g / g. While Example 3, which has the strongest foaming, has a 24-hour water collection capacity of 0.87g / g and a saturated water collection capacity of 1.35g / g, which are increased by 85% and 47% respectively. Therefore, the structure of the atmospheric water collection porous gel can be artificially regulated by adjusting the concentration of the foaming agent, the foam stabilizer, and the foaming aid. The present invention provides a method for preparing a porous gel for atmospheric water collection. The atmospheric water collection porous gel is prepared by a simple foaming method, and the pore structure of the porous gel can be regulated by changing the concentration of the foaming agent, the foam stabilizer, and the foaming aid. The method is easy to operate, low in cost, easy to scale up production, and has good practicality.

[0074] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of 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 method for preparing an atmospheric water collection porous gel, characterized in that: The following steps are involved: S1, dissolving the monomer, foam stabilizer and foaming aid in an acidic solution and stirring to form a solution A; S2, mixing N,N'-methylenebisacrylamide, tetramethylethylenediamine and an initiator with the solution A to form a solution B; S3, mixing the foaming agent with the solution B, and allowing to stand for reaction to form a matrix C; S4, drying the substrate C and immersing it in a solution D to react and form a precursor E; S5, drying the precursor E to obtain an atmospheric water collection porous gel material; The monomer is selected from any one or more combinations of acrylamide, acrylic acid, N-isopropylacrylamide or N,N-dimethylacrylamide; The solution D is selected from any one or more of aqueous solutions of calcium chloride, lithium chloride, magnesium chloride, magnesium sulfate, lithium bromide or polypyrrole chloride.

2. The method for preparing the atmospheric water-collecting porous gel according to claim 1, characterized in that: The acidic solution is selected from any one of acetic acid solution, hydrochloric acid solution or formic acid solution.

3. The method for preparing the atmospheric water collection porous gel according to claim 1, characterized in that: The foam stabilizer includes any one or a combination of polyoxyethylene-polyoxypropylene ether block copolymer or poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) block copolymer.

4. The method for preparing the atmospheric water collection porous gel according to claim 1, characterized in that: The foaming aid includes any one or more combinations of sodium dodecyl sulfate, sodium dodecyl sulfonate or sodium polyoxyethylene fatty alcohol sulfate.

5. The method for preparing the atmospheric water-collecting porous gel according to claim 1, characterized in that: The initiator is selected from ammonium persulfate or potassium persulfate.

6. The method for preparing the atmospheric water-collecting porous gel according to claim 1, characterized in that: The solution B also includes an auxiliary gelling substance. The preparation process of the solution B is as follows: firstly, the auxiliary gelling substance is mixed with the solution A, and then mixed with N,N'-methylenebisacrylamide, tetramethylethylenediamine and an initiator to form the solution B.

7. The method for preparing the atmospheric water collection porous gel according to claim 6, characterized in that: The auxiliary gel material is any one or more combinations of sodium carboxymethyl cellulose, chitosan, sodium alginate, maltodextrin, starch, agar or gelatin.

8. The method for preparing the atmospheric water-collecting porous gel according to claim 1, characterized in that: The foaming agent is sodium bicarbonate or potassium bicarbonate.

9. The method for preparing the atmospheric water collection porous gel according to any one of claims 1 to 8, characterized in that: The monomer concentration is in the range of 0.1 g / mL to 2 g / mL, the foam stabilizer concentration is in the range of 0.001 g / mL to 0.01 g / mL, the pH of the acidic solution is ≤1, the foaming aid concentration is in the range of 0.001 g / mL to 0.05 g / mL, the initiator concentration is in the range of 0.01 g / mL to 0.05 g / mL, and the foaming agent addition amount is in the range of 0.05 g / mL to 1 g / mL; after the matrix C is dried, it is immersed in the solution D for a reaction time of greater than or equal to 24 hours.

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