CN114196154A - P-CaCl2-AuCr-MOF aerogel material, and preparation method and application thereof - Google Patents
P-CaCl2-AuCr-MOF aerogel material, and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to the field of air water production, in particular to P-CaCl2-an AuCr-MOF aerogel material, a method for its preparation and its use, said P-CaCl2-AuCr-MOF aerogel material comprising MIL-101 (Cr) nanomatrix; au nanoparticles and cross-linked poly N-isopropyl acryloyl are loaded on the MIL-101 (Cr) nano substrateAmine polymers and metal salts. The invention overcomes the defects that the prior air water making material can not make water continuously at normal temperature, needs intermittent adsorption-desorption process and needs to provide electric energy in the water making process, can continuously perform adsorption-desorption cycle operation at normal temperature by only utilizing the self characteristics of the material, does not need any evaporator and condenser, overcomes the prior intermittent adsorption-desorption process, and simultaneously, the gold particles in the material can play a role in diffuse scattering on light, thereby having higher desorption speed and higher desorption efficiency on water under the same illumination condition and leading the daily water yield to be higher.
Description
Technical Field
The invention relates to the field of air water production, in particular to P-CaCl2-AuCr-MOF aerogel materials, methods of making and uses thereof.
Background
It is well known that water is the most important substance for life maintenance and is known as the "source of life". However, the drinking water is seriously deficient all over the world, the water source has less than 1% of fresh water resources, and with the rapid development of modern industry, a large amount of fresh water resources are exploited, polluted and even exhausted in parts of regions. Therefore, safe water use for human beings is being challenged more and more.
The water vapor in the atmosphere can be continuously supplemented through a global hydrologic cycle system, the water source is sufficient and inexhaustible, and the method is a reliable fresh water resource source. The water vapor in the air does not contain heavy metal, pesticide residue, COD and other substances which influence the water quality, and the water is taken from the air conveniently, quickly, safely, reliably, pure, fresh and delicious, thus being ecological healthy water in the true sense.
The existing air water making technology has the following defects:
(1) the condensation technology needs electric energy in the air water making process, and a compressor and a condenser are used, so the condensation technology is large in size, only suitable for high-temperature and high-humidity conditions, and low in water making efficiency in winter. The range of use is limited.
(2) Bionic technology is used for collecting moisture in air by imitating the characteristics of certain desert insects or plants. The technical advantage is that water can be collected without using electrical energy. But the water production efficiency is not high, the volume is large, and the intermittent work is needed by utilizing the day and night temperature difference.
(3) The existing adsorption and desorption technology is hardly limited by temperature and humidity conditions, and energy assistance is not needed, but the desorption process needs higher desorption temperature (higher than 70 ℃) and auxiliary energy for desorption, such as solar energy and electric heat energy. In addition, the adsorption and desorption processes are carried out discontinuously and cannot be carried out simultaneously, and the valve switch needs to be switched between the adsorption and desorption processes ceaselessly.
Disclosure of Invention
Hair brushObviously overcomes the defects that the prior air water making material can not make water continuously at normal temperature, needs intermittent adsorption-desorption process and needs to provide electric energy in the water making process, and provides P-CaCl2A preparation method of the AuCr-MOF aerogel material and application thereof to overcome the defects.
In order to achieve the purpose, the invention is realized by the following technical scheme:
P-CaCl2-an AuCr-MOF aerogel material,
comprises an MIL-101 (Cr) nano substrate;
au nanoparticles are loaded on the MIL-101 (Cr) nano substrate;
the MIL-101 (Cr) nano substrate is also attached with a cross-linked poly N-isopropylacrylamide polymer and a metal salt;
the cross-linked poly-N-isopropylacrylamide polymer has intramolecular hydrogen bonds with hydrophobic characteristics in the molecule.
P-CaCl2-a method for preparing an AuCr-MOF aerogel material, comprising the steps of:
(1) taking mil-101 (Cr) nanoparticles and Au nanoparticles as raw materials, and reacting in an aqueous solution to obtain AuCr-MOF nanoparticles;
(2) after dispersing AuCr-MOF nanoparticles into deionized water, adding NIPAM and a cross-linking agent into the deionized water, and polymerizing under the action of an initiator to obtain a P-AuCr-MOF aerogel material;
(3) salifying the prepared P-AuCr-MOF aerogel material to obtain P-CaCl2-new AuCr-MOF aerogel materials.
P-CaCl in the invention2AuCr-MOF aerogel material which employs MIL-101 (chromium) nanomaterials with remarkable water stability and fast adsorption kinetics as substrate. The MIL-101 (chromium) nano material has a pore size window (1.2 nm-1.6 nm) close to the size of water molecules and a pore volume (2.9 nm-3.4nm in diameter) of 2.0-2.4 cm3Per g, having a high specific surface area of 3000m2~4500m2And has extremely strong adsorption capacity.
After the MIL-101 (chromium) nano material and the gold nanoparticles are loaded, the gold particles can play a role in diffuse scattering of light, so that most of light energy can be left in the aerogel material instead of being directly reflected out, the temperature rise speed of the aerogel material is higher, the aerogel material has higher desorption speed and higher desorption efficiency on water under the same illumination condition, and the daily water yield is higher.
Meanwhile, the poly N-isopropyl acrylamide polymer (PNIPAM) is obtained in the preparation process, and the macromolecular chain of the poly N-isopropyl acrylamide polymer simultaneously has hydrophilic acylamino and hydrophobic isopropyl, so that the aqueous solution of the linear PNIPAM and the crosslinked poly N-isopropyl acrylamide hydrogel have temperature sensitivity. Namely, when the aqueous solution is heated to about 33 ℃, phase change occurs, the homogeneous system is converted into the heterogeneous system, and the volume of the chemically crosslinked poly N-isopropyl acrylamide hydrogel suddenly shrinks when the temperature is raised to about 32 ℃. This sudden shrinkage characteristic of volume becomes a source of power in the desorption of water, and in addition, the desorption of water is further promoted due to the presence of hydrophobic isopropyl groups.
The researchers of the invention find that after the AuCr-MOF nano particles are added into the poly N-isopropylacrylamide matrix, no obvious interface gap is generated between the AuCr-MOF nano particles and the poly N-isopropylacrylamide matrix, so that the material prepared by the method combines the excellent water absorption of the AuCr-MOF (MIL-101 (chromium)) and the dynamic structure phase change property of the poly N-isopropylacrylamide.
In addition, in order to further improve the water absorption performance, the salt with strong water absorption is used for salinizing the P-AuCr-MOF hydrogel, so that the water yield can be further improved.
Preferably, the mol ratio of mil-101 (Cr) nanoparticles to Au nanoparticles in step (1) is 1: (0.01 to 0.1);
the reaction temperature is 30-55 ℃, and the reaction time is 5-12 h.
Preferably, the molar ratio of the AuCr-MOF nanoparticles, the NIPAM, and the cross-linking agent in step (2) is 1: (30-45): (1-2).
Preferably, the molar ratio of the AuCr-MOF nanoparticles, the NIPAM, and the cross-linking agent in step (2) is 1: (30-45): (1-2).
More preferably, the crosslinking agent is N, N' -methylenebisacrylamide.
Preferably, the initiator in the step (2) is a mixture of ammonium persulfate and tetramethylethylenediamine;
wherein the molar ratio of ammonium persulfate to tetramethylethylenediamine is 1: (2-4).
Preferably, the addition amount of the initiator is 3-6% of the total mole amount of the NIPAM and the cross-linking agent.
Preferably, the polymerization temperature in the step (2) is 0-10 ℃, and the reaction time is 8-24 h.
Further preferably, step (2) requires purging the AuCr-MOF nanoparticle dispersion with nitrogen under ice bath conditions for 15 minutes prior to adding the NIPAM and crosslinker.
Preferably, the P-AuCr-MOF aerogel material in the step (3) needs to be activated before salinization treatment;
the activation step comprises soaking in water with the temperature lower than 10 ℃ and water with the temperature of 50-70 ℃ in sequence, and repeating for 3-10 times.
When the P-AuCr-MOF aerogel material is contacted with water after being prepared and molded, firstly, the amide group in the molecule can form a hydrogen bond with the water, so that the material has hydrophilicity, and is not beneficial to desorption of the water. According to the invention, the P-AuCr-MOF aerogel material is sequentially soaked in water with the temperature lower than 10 ℃ and water with the temperature of 50-70 ℃, and when the water temperature is higher than 50, the hydrogen bonds between the P-AuCr-MOF aerogel material and water molecules are broken, so that the generation of hydrophobic characteristics (C ═ O H-N) formed by intramolecular hydrogen bonds can be induced, thus forming spherical hydrogel, weakening the affinity with water and being beneficial to desorption of water.
Preferably, the P-AuCr-MOF aerogel material needs to be sequentially subjected to CaCl at the temperature of less than 10 ℃ during the salting treatment in the step (3)2Soaking in the solution, then respectively cleaning with water at the temperature of less than 10 ℃ and 50-70 ℃, and repeating the whole cleaning process for 2-5 times.
Preferably, CaCl is used in the step (3)2The concentration of the solution is 1000-2000 mg/ml;
P-in CaCl is AuCr-MOF aerogel material2The soaking time in the solution is 8-16 h.
P-CaCl as described above2Application of AuCr-MOF aerogel material in water production from air.
Therefore, the invention has the following beneficial effects:
(1) the invention can continuously carry out adsorption-desorption cycle operation at normal temperature by utilizing the self characteristics of the material without any evaporator and condenser, overcomes the defects of the prior discontinuous adsorption-desorption process without providing electric energy, and can collect about 7.3 g of water per day for one gram of material under the conditions of 90 percent of relative humidity and normal temperature.
(2) Because no electric energy is needed, no evaporator, condenser, compressor and the like are needed, the structure of the water making equipment can be greatly simplified, the stability of water making is greatly improved, and the application range is wider.
Drawings
FIG. 1 is a process flow diagram for preparing AuCr-MOF nanoparticles in example 1 of the present invention.
FIG. 2 is a process flow diagram for preparing a P-AuCr-MOF aerogel material in example 1 of the present invention.
FIG. 3 shows the preparation of P-CaCl in example 1 of the present invention2-process flow diagram of AuCr-MOF aerogel material.
FIG. 4 is the scanning electron micrograph of the MIL-101 (Cr) nanomaterial used.
FIG. 5 is a photo of the prepared AuCr-MOF nano-material.
FIG. 6 is a scanning electron micrograph of poly-N-isopropylacrylamide.
FIG. 7 is a scanning electron micrograph of P-AuCr-MOF prepared by the method of the present invention.
FIG. 8 is a schematic diagram of the mechanism of hydrogen bond formation in the molecule of poly-N-isopropylacrylamide.
FIG. 9 is a scanning electron micrograph of salted P-AuCr-MOF.
FIG. 10 shows P-CaCl2-AuCr-MOF and P-CaCl2The reflectivity of the two materials for light of different wavelengths.
FIG. 11 shows P-CaCl2-AuCr-MOF and P-CaCl2The surface temperature of the two materials is shown as a function of time.
FIG. 12 is a graph of the daily water yield ratio of several water-absorbing materials.
FIG. 13 shows the results of Fourier transform infrared spectroscopy analysis before and after cycling.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Example 1
1) And (3) preparing AuCr-MOF nanoparticles.
The process for preparing AuCr-MOF nanoparticles is shown in the process flow chart of FIG. 1.
Firstly, dispersing 1mol of mil-101 (Cr) nanoparticles into 0.6mol of deionized water, stirring for 1 hour at 45 ℃, then dropwise adding 1.2L of Au nanoparticle solution with the concentration of 0.05mol/L into the dispersed solution, stirring for 8 hours at 45 ℃, cooling the solution to room temperature, separating the AuCr-MOF nanoparticles by using a centrifuge, and drying in vacuum for later use.
2) Preparation of P-AuCr-MOF aerogel material
The process for preparing the P-AuCr-MOF aerogel material is shown in a process flow chart of FIG. 2.
Dispersing 1mol of AuCr-MOF nanoparticles into 0.25mol of deionized water, uniformly stirring, adding 39.7mol of NIPAM and 1.5mol of cross-linking agent MBA into the solution, purging for 15 minutes by using nitrogen under the ice bath condition, then dropwise adding 0.6mol of catalyst ammonium persulfate and 1.8mol of TEMED into the solution, pouring the mixed solution into a culture dish, reacting for 12 hours at the temperature of 4 ℃, fully reacting to obtain P-AuCr-MOF hydrogel, washing with a large amount of deionized water, and freeze-drying to obtain the P-AuCr-MOF aerogel material.
3）P-CaCl2Preparation of-AuCr-MOF aerogel materials
Preparation of P-CaCl2The process method of the AuCr-MOF aerogel material is shown in a process flow chart of FIG. 3.
Soaking P-AuCr-MOF aerogel in a large amount of deionized water at 5 ℃ for 15 minutes, then rapidly transferring the P-AuCr-MOF aerogel into hot ionized water at 60 ℃ for further soaking for 15 minutes, repeating the process for 5 times, fully activating the P-AuCr-MOF aerogel, and then rapidly soaking the P-AuCr-MOF aerogel in CaCl at 5 ℃ and with the concentration of about 1600mg/ml2Soaking in the solution for 12 hr, washing with 60 deg.C hot ionized water for 15 min, washing with 5 deg.C cold ionized water for 15 min, repeating the above washing process for 3 times to thoroughly salinize P-AuCr-MOF hydrogel, and drying and freezing in vacuum drying oven to obtain P-CaCl2-new AuCr-MOF aerogel materials.
Example 2
1) And (3) preparing AuCr-MOF nanoparticles.
Firstly, dispersing 1mol of mil-101 (Cr) nanoparticles into 0.6mol of deionized water, stirring for 1 hour at 45 ℃, then dropwise adding 200 ml of Au nanoparticle solution with the concentration of 0.05mol/L into the dispersed solution, stirring for 12 hours at 30 ℃, cooling the solution to room temperature, separating the AuCr-MOF nanoparticles by using a centrifuge, and drying in vacuum for later use.
2) Preparation of P-AuCr-MOF aerogel material
Dispersing 1mol of AuCr-MOF nanoparticles into 0.25mol of deionized water, uniformly stirring, adding 30mol of NIPAM and 1mol of cross-linking agent MBA into the solution, purging for 15 minutes by using nitrogen under an ice bath condition, then dropwise adding 0.5 mol of catalyst ammonium persulfate and 1mol of TEMED into the solution, pouring the mixed solution into a culture dish, reacting for 24 hours at the temperature of 0 ℃ for full reaction to obtain P-AuCr-MOF hydrogel, washing with a large amount of deionized water, and freeze-drying to obtain the P-AuCr-MOF aerogel material.
3）P-CaCl2Preparation of-AuCr-MOF aerogel materials
Adding P-AuCr-MOSoaking F aerogel in 5 deg.C deionized water for 15 min, quickly transferring to 60 deg.C hot ionized water, soaking for 15 min, repeating the above process for 3 times, activating P-AuCr-MOF hydrogel sufficiently, and quickly soaking in 5 deg.C CaCl with concentration of 1000mg/ml2Soaking in the solution for 8 hr, washing with 60 deg.C hot ionized water for 15 min, washing with 5 deg.C cold ionized water for 15 min, repeating the above washing process for 2 times to thoroughly salinize P-AuCr-MOF hydrogel, and drying and freezing in vacuum drying oven to obtain P-CaCl2-new AuCr-MOF aerogel materials.
Example 3
1) And (3) preparing AuCr-MOF nanoparticles.
Firstly, dispersing 1mol of mil-101 (Cr) nanoparticles into 0.6mol of deionized water, stirring for 1 hour at 45 ℃, then dropwise adding 2L of Au nanoparticle solution with the concentration of 0.05mol/L into the dispersed solution, stirring for 5 hours at 55 ℃, cooling the solution to room temperature, separating the AuCr-MOF nanoparticles by using a centrifugal machine, and drying in vacuum for later use.
2) Preparation of P-AuCr-MOF aerogel material
Dispersing 1mol of AuCr-MOF nanoparticles into 0.25mol of deionized water, uniformly stirring, adding 45mol of NIPAM and 2mol of cross-linking agent MBA into the solution, purging for 15 minutes by using nitrogen under an ice bath condition, then dropwise adding 0.4 mol of catalyst ammonium persulfate and 1.6mol of TEMED into the solution, pouring the mixed solution into a culture dish, reacting for 24 hours at the temperature of 10 ℃ for full reaction to obtain P-AuCr-MOF hydrogel, washing with a large amount of deionized water, and freeze-drying to obtain the P-AuCr-MOF aerogel material.
3）P-CaCl2Preparation of-AuCr-MOF aerogel materials
Soaking P-AuCr-MOF aerogel in a large amount of deionized water at 5 ℃ for 15 minutes, then quickly transferring the P-AuCr-MOF aerogel into hot ionized water at 60 ℃ for soaking for 15 minutes, repeating the process for 10 times, fully activating the P-AuCr-MOF aerogel, and then quickly soaking the P-AuCr-MOF aerogel in CaCl at 5 ℃ and with the concentration of about 2000mg/ml2Soaking in the solution for 16 hr, and soaking with 60 deg.CCleaning with hot ionized water at 5 deg.C for 15 min, cleaning with cold ionized water at 5 deg.C for 15 min, repeating the above cleaning process for 5 times to completely salinize P-AuCr-MOF hydrogel, and drying and freezing in vacuum drying oven to obtain P-CaCl2-new AuCr-MOF aerogel materials.
Example 4
1) And (3) preparing AuCr-MOF nanoparticles.
Firstly, dispersing 1mol of mil-101 (Cr) nanoparticles into 0.6mol of deionized water, stirring for 1 hour at 45 ℃, then dropwise adding 1L of Au nanoparticle solution with the concentration of 0.05mol/L into the dispersed solution, stirring for 10 hours at 40 ℃, cooling the solution to room temperature, separating the AuCr-MOF nanoparticles by using a centrifugal machine, and drying in vacuum for later use.
2) Preparation of P-AuCr-MOF aerogel material
Dispersing 1mol of AuCr-MOF nanoparticles into 0.25mol of deionized water, uniformly stirring, adding 35mol of NIPAM and 1.5mol of cross-linking agent MBA into the solution, purging for 15 minutes by using nitrogen under an ice bath condition, then dropwise adding 0.6mol of catalyst ammonium persulfate and 1.8mol of TEMED (1 (2-4)) into the solution, pouring the mixed solution into a culture dish, reacting for 18 hours at the temperature of 45 ℃ to obtain P-AuCr-MOF hydrogel, washing with a large amount of deionized water, and freeze-drying to obtain the P-AuCr-MOF aerogel material.
3）P-CaCl2Preparation of-AuCr-MOF aerogel materials
Soaking P-AuCr-MOF aerogel in a large amount of deionized water at 5 ℃ for 15 minutes, then quickly transferring the P-AuCr-MOF aerogel into hot ionized water at 60 ℃ for soaking for 15 minutes, repeating the process for 4 times, fully activating the P-AuCr-MOF aerogel, and then quickly soaking the P-AuCr-MOF aerogel in CaCl at 5 ℃ and with the concentration of about 1800mg/ml2Soaking in the solution for 10 hr, cleaning with 50 deg.C hot ionized water for 15 min, cleaning with 5 deg.C cold ionized water for 15 min, repeating the above cleaning process for 4 times to thoroughly salinize P-AuCr-MOF hydrogel, and drying and freezing in vacuum drying oven to obtain P-CaCl2-new AuCr-MOF aerogel materials.
Example 5
1) And (3) preparing AuCr-MOF nanoparticles.
Firstly, dispersing 1mol of mil-101 (Cr) nanoparticles into 0.6mol of deionized water, stirring for 1 hour at 45 ℃, then dropwise adding 1.6L of Au nanoparticle solution with the concentration of 0.05mol/L into the dispersed solution, stirring for 10 hours at 35 ℃, cooling the solution to room temperature, separating the AuCr-MOF nanoparticles by using a centrifuge, and drying in vacuum for later use.
2) Preparation of P-AuCr-MOF aerogel material
Dispersing 1mol of AuCr-MOF nanoparticles into 0.25mol of deionized water, uniformly stirring, adding 42mol of NIPAM and 1.25mol of cross-linking agent MBA into the solution, purging for 15 minutes by using nitrogen under an ice bath condition, then dropwise adding 0.6mol of catalyst ammonium persulfate and 1.8mol of TEMED (1 (2-4)) into the solution, pouring the mixed solution into a culture dish, reacting for 18 hours at the temperature of 5 ℃ to obtain P-AuCr-MOF hydrogel, washing with a large amount of deionized water, and freeze-drying to obtain the P-AuCr-MOF aerogel material.
3）P-CaCl2Preparation of-AuCr-MOF aerogel materials
Soaking P-AuCr-MOF aerogel in a large amount of deionized water at 5 ℃ for 15 minutes, then quickly transferring the P-AuCr-MOF aerogel into hot ionized water at 60 ℃ for soaking for 15 minutes, repeating the process for 4 times, fully activating the P-AuCr-MOF aerogel, and then quickly soaking the P-AuCr-MOF aerogel in CaCl at 5 ℃ and with the concentration of about 1500mg/ml2Soaking in the solution for 14 hr, cleaning with 70 deg.C hot ionized water for 15 min, cleaning with 5 deg.C cold ionized water for 15 min, repeating the above cleaning process for 4 times to thoroughly salinize P-AuCr-MOF hydrogel, and drying and freezing in vacuum drying oven to obtain P-CaCl2-new AuCr-MOF aerogel materials.
[ Performance test ]
FIG. 4 is the scanning electron micrograph of the MIL-101 (Cr) nanomaterial used. FIG. 5 is a photo of the prepared AuCr-MOF nano-material. As can be seen from the figure, Au nanoparticles can be effectively loaded on the MIL-101 (chromium) nanomaterial by the preparation method of the invention.
FIG. 6 is a scanning electron micrograph of poly-N-isopropylacrylamide. FIG. 7 is a scanning electron micrograph of P-AuCr-MOF prepared by the method of the present invention. As can be seen from the figure, the AuCr-MOF nanoparticles are added into the poly-N-isopropylacrylamide matrix, no obvious interfacial gap is generated between the AuCr-MOF nanoparticles and the poly-N-isopropylacrylamide matrix, and the prepared material combines the excellent water absorption of the AuCr-MOF (MIL-101 (chromium)) and the dynamic structural phase change property of the poly-N-isopropylacrylamide.
FIG. 8 shows P-CaCl prepared according to the present invention2The mechanism of intramolecular hydrogen bond formation of poly-N-isopropylacrylamide in AuCr-MOF is produced by the hydrophobic character (C ═ O H-N) that can induce intramolecular hydrogen bond formation by treatment in deionized water at 60 ℃. Then, the functional polymer chains were unlocked by soaking in cold saline solution (5 ℃) to achieve intermolecular interactions and simultaneously activate the salinization conversion of the metal organic framework to poly-N-isopropylacrylamide-metal organic framework. The scanning electron micrograph of the salified P-AuCr-MOF is shown in FIG. 9.
FIG. 10 shows P-CaCl2-AuCr-MOF and P-CaCl2The reflectivity of the two materials for light of different wavelengths. FIG. 11 is a graph showing the surface temperature of the above two materials as a function of time. The invention utilizes AuCr-MOF to replace MIl-101 (Cr) to prepare P-CaCl2-AuCr-MOF aerogel vs. P-CaCl without gold particles2The aerogel has higher desorption speed and higher desorption efficiency under the same illumination condition, so the daily water yield is higher. The reason is that the gold particles scatter light rays, most of light energy is left in the material body instead of being reflected out, and the material has a faster self-heating effect.
A comparison of the daily water production of several water-absorbing materials is shown in FIG. 12. From the figure, P-CaCl can be seen2AuCr-MOF has more excellent air water production characteristics compared with other water absorption materials.
Furthermore, P-CaCl2-Cr-MOF and P-CaCl2The AuCr-MOF not only has excellent air water-making property, but also has stable material property, the material property is almost unchanged after repeated recycling in 2160 hours, and the materials before and after the recycling are shown in figure 13The infrared spectrum analysis result of the change of the inner leaves can be seen.
Claims (10)
1. P-CaCl2-AuCr-MOF aerogel material, characterized in that,
comprises an MIL-101 (Cr) nano substrate;
au nanoparticles are loaded on the MIL-101 (Cr) nano substrate;
the MIL-101 (Cr) nano substrate is also attached with a cross-linked poly N-isopropylacrylamide polymer and a metal salt;
the cross-linked poly-N-isopropylacrylamide polymer has intramolecular hydrogen bonds with hydrophobic characteristics in the molecule.
2. P-CaCl2A process for the preparation of an AuCr-MOF aerogel material,
the method comprises the following steps:
(1) taking mil-101 (Cr) nanoparticles and Au nanoparticles as raw materials, and reacting in an aqueous solution to obtain AuCr-MOF nanoparticles;
(2) after dispersing AuCr-MOF nanoparticles into deionized water, adding NIPAM and a cross-linking agent into the deionized water, and polymerizing under the action of an initiator to obtain a P-AuCr-MOF aerogel material;
(3) salifying the prepared P-AuCr-MOF aerogel material to obtain P-CaCl2-new AuCr-MOF aerogel materials.
3. P-CaCl according to claim 22A process for the preparation of an AuCr-MOF aerogel material,
the mol ratio of mil-101 (Cr) nanoparticles to Au nanoparticles in the step (1) is 1: (0.01 to 0.1);
the reaction temperature is 30-55 ℃, and the reaction time is 5-12 h.
4. P-CaCl according to claim 22A process for the preparation of an AuCr-MOF aerogel material,
the molar ratio of the AuCr-MOF nanoparticles, the NIPAM and the cross-linking agent in the step (2) is 1: (30-45): (1-2).
5. P-CaCl according to claim 2 or 42A process for the preparation of an AuCr-MOF aerogel material,
the initiator in the step (2) is a mixture of ammonium persulfate and tetramethylethylenediamine;
wherein the molar ratio of ammonium persulfate to tetramethylethylenediamine is 1: (2-4).
6. P-CaCl according to claim 52A process for the preparation of an AuCr-MOF aerogel material,
in the step (2), the polymerization temperature is 0-10 ℃, and the reaction time is 8-24 h.
7. P-CaCl according to claim 22A process for the preparation of an AuCr-MOF aerogel material,
in the step (3), the P-AuCr-MOF aerogel material needs to be activated before salinization treatment;
the activation step comprises soaking in water with the temperature lower than 10 ℃ and water with the temperature of 50-70 ℃ in sequence, and repeating for 3-10 times.
8. P-CaCl according to claim 22A process for the preparation of an AuCr-MOF aerogel material,
in the salinization treatment process in the step (3), the P-AuCr-MOF aerogel material needs to be sequentially placed in CaCl with the temperature of lower than 10 DEG C2Soaking in the solution, then respectively cleaning with water at the temperature of less than 10 ℃ and 50-70 ℃, and repeating the whole cleaning process for 2-5 times.
9. P-CaCl according to claim 82A process for the preparation of an AuCr-MOF aerogel material,
CaCl in the step (3)2The concentration of the solution is 1000-2000 mg/ml;
P-AuCr-MOF aerogel material in CaCl2The soaking time in the solution is 8-16 h.
10. The P-CaCl as defined in any one of claims 1 to 92Application of AuCr-MOF aerogel material in water production from air.
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Application publication date: 20220318 Assignee: ZHEJIANG TIANDUOHAO ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Assignor: HANGZHOU DIANZI University Contract record no.: X2022330000647 Denomination of invention: A P-CaCl2- AuCr MOF aerogel material, its preparation method and application Granted publication date: 20220819 License type: Common License Record date: 20221107 |