Cat-based mixed matrix membranes, methods of making and use

Abstract

The application belongs to the technical field of preparation of photo-thermal water production membranes, and discloses a CAT-based mixed matrix membrane, a preparation method and application, which is made of Ti-CAT, CNT and PCMVIMX; the three-dimensional network structure Ti-CAT is used as a water transmission channel, the CNT acts as a solar light absorber to increase the light absorption of the membrane, and the self-crosslinking property of PCMVIMX under ammonia gas is used as an adhesive to crosslink Ti-CAT and CNT together, and finally a dense photo-thermal water production membrane is formed. The water production membrane has good acid-base stability, excellent cycle performance and salt resistance. The membrane preparation method is simple and convenient, and can quickly prepare a high-speed water production membrane. The method is suitable for preparing a mixed matrix membrane of a porous material and a carbon material, and in general cases, the preparation of a photo-thermal water production membrane usually uses a coating method. The method for preparing the membrane by using such a polyelectrolyte as an adhesive is helpful to improve the stability of the membrane.

Description

Technical Field

[0001] This invention belongs to the field of photothermal water production membrane preparation technology, and particularly relates to a CAT-based hybrid matrix membrane, its preparation method and application. Background Technology

[0002] Solar energy is a good clean energy source to replace fossil fuels, and the conversion between light and heat is an effective method for capturing solar energy and a necessary condition for solar thermal water production. Compared with traditional evaporation water production, interfacial solar steam generation (ISSG) technology restricts heat conduction at the air-water interface, thereby reducing heat loss and improving energy utilization efficiency. Currently, many research groups are working on the preparation and design of solar thermal materials to ultimately improve solar thermal conversion efficiency. Light-absorbing materials are commonly used in the absorption part of solar thermal interface films, responsible for capturing sunlight. Commonly used light-absorbing materials include carbon materials, organic polymers, inorganic semiconductor materials, and metal nanomaterials. Carbon materials have high light absorption in the ultraviolet-visible-near-infrared region and excellent thermal conversion efficiency. Frequently used carbon materials include graphene, carbon black, and carbon nanotubes. Carbon nanotubes are a class of one-dimensional tubular carbon materials with good light absorption and thermal conductivity.

[0003] According to existing literature, the micropores within materials facilitate the evaporative transport of water molecules. Currently, various porous materials are used as water molecule transport channels, such as carbonized wood or light-absorbing materials coated on wood cross-sections. The fiber channels of the wood itself are used for water molecule transport in photothermal processes to increase the transport rate. Furthermore, the channels generated during the preparation of hydrogels are also used as water transport channels. Calculations show that channels similar to those within wood or hydrogel structures are conducive to the formation of discrete water molecules and water molecule clusters, thus reducing the number of hydrogen bonds that water molecules need to overcome when evaporating from the channels, effectively lowering the enthalpy of evaporation. However, such porous materials lack an ordered pore environment, making it impossible to design orderly channels from the source for photothermal water production films. Metal-organic frameworks (MOFs) possess regular pore structures and well-defined pore environments, allowing for effective assessment and prediction of their interactions with water molecules to regulate transport efficiency. Ti-CAT is a two-dimensional layered MOF material with one-dimensional hexagonal channels. The oxygen atoms on the inner walls of these channels can form hydrogen bonds with water molecules. It helps water form dispersed water molecules or water molecule clusters, reduces the enthalpy of vaporization of water molecules, and increases the rate of water evaporation.

[0004] Based on the above analysis, the problems and shortcomings of existing technologies are as follows: Although the amorphous porous materials used in existing technologies have abundant pores, the pore orientation is chaotic, and the internal structure of the pores is unknown. Therefore, the effectiveness of photothermal water production can only be determined through tedious and repeated experiments. It is impossible to understand the interaction between water molecules and the pore walls, explore the transport behavior of water molecules within the pores, and thus predict experimental results by analyzing the structure of the porous material. Furthermore, it is impossible to regulate the interaction between the pore walls and water molecules by modifying the internal environment of the porous material to adjust the rate of photothermal water production. Therefore, the design of the photothermal water production membrane at its source is limited. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a CAT-based hybrid matrix membrane, its preparation method, and its application.

[0006] This invention is achieved as follows: Ti-CAT belongs to the metal-organic framework material and has a well-defined crystal structure. By analyzing the crystal structure, a clear pore environment and pore arrangement can be obtained. This well-defined Ti-CAT pore environment provides a basis for understanding and studying the molecular mechanism of water molecule transport. The Ti-CAT-based hybrid matrix membrane is made of Ti-CAT, carbon nanotubes (CNTs), and polyelectrolytes (PCMVIMX). While maintaining a constant PCMVIMX content of 10 wt%, the proportion of Ti-CAT in the membrane ranges from 0-90 wt%, and the corresponding CNT content ranges from 90-0 wt%.

[0007] X represents an anion, which can be either hydrophilic or hydrophobic.

[0008] Furthermore, X is a hydrophilic group including: Br, Cl, SO3, NO3, CH3COO.

[0009] Furthermore, X is a hydrophobic group including: TFSI, BF4, PF6, BPh4, CF3COO.

[0010] Another objective of this invention is to provide a method for preparing the CAT-based hybrid matrix membrane. The method involves using a three-dimensional network structure Ti-CAT as a water transport channel, CNTs as solar absorbers to increase the membrane's light absorption, and utilizing the self-crosslinking properties of PCMVIMX under ammonia conditions as a binder to crosslink Ti-CAT and CNTs together. The hybrid matrix membrane is prepared by combining a one-dimensional porous metal-organic framework Ti-CAT with CNTs, using PCMVIMX as a binder, and crosslinking them in an ammonia atmosphere.

[0011] Furthermore, the preparation method of the Ti-CAT-based hybrid matrix membrane specifically includes the following steps:

[0012] The first step involves adding a certain amount of N,N-dimethylformamide or water to a fixed PCMVIMX mass of 3.0g, Ti-CAT content ranging from 0 to 27.0g, and CNT content ranging from 27.0 to 0g, and then ultrasonically preparing a homogeneous mixed solution.

[0013] In the second step, the above mixed solution was filtered onto a polytetrafluoroethylene membrane (PVDF, 4 cm in diameter, 0.22 μm) to obtain a complete Ti-CAT / CNT@PCMVIMX membrane.

[0014] The third step is to place the membrane obtained in the above steps in an 80°C oven to dry it.

[0015] Thirdly, due to the self-crosslinking property of PCMVIMX under ammonia conditions, it can act as a binder for Ti-CAT and CNT. The dried Ti-CAT / CNT@PCMVIMX membrane is placed in an ammonia atmosphere to obtain the finally usable Ti-CAT / CNT@PCMVIMX.

[0016] Furthermore, the ammonia gas originates from 0.2wt%-14wt% ammonia water.

[0017] Furthermore, the reaction time is 10 min to 14 hours.

[0018] Another object of the present invention is to provide an application of the CAT-based hybrid matrix membrane in the product water of water sources with different pH values.

[0019] Another object of the present invention is to provide an application of the CAT-based hybrid matrix membrane in the product water of different actual water sources.

[0020] Another objective of this invention is to provide an application of the CAT-based hybrid matrix membrane in producing water from different actual water sources, including lake water, seawater, river water, and domestic wastewater.

[0021] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0022] First, this invention utilizes a three-dimensional network structure, Ti-CAT, as a water transport channel. Ti-CAT has neatly arranged channels and a well-defined internal environment, which allows for effective interaction between the channels and water molecules, thus controlling the water molecule transport rate. CNTs, due to their excellent light absorption properties, are used in the matrix membrane as solar absorbers to increase the membrane surface temperature. PCMVIMX, exhibiting self-crosslinking properties under ammonia conditions, is used as a binder in the matrix membrane to crosslink Ti-CAT and CNTs, ultimately forming a dense photothermal water-producing membrane. This water-producing membrane exhibits good acid-base stability and cycling stability. This membrane fabrication method is simple and convenient, enabling rapid preparation of high-speed water-producing membranes. This invention uses prepared polyelectrolytes PCMVIMX, Ti-CAT, and CNTs as raw materials, and leverages the characteristic of cyano groups in PCMVIMX crosslinking to form triazine rings, as well as the preparation of photothermal water-producing membranes using Ti-CAT.

[0023] Secondly, this invention prepares a hybrid matrix membrane by crosslinking a one-dimensional porous metal-organic framework Ti-CAT with CNTs in an ammonia atmosphere using PCMVIMX as a binder, and applies it to photothermal water production research. The conditions used in preparing the hybrid matrix membrane in this invention are simple and rapid, the crosslinking conditions are mild and do not affect the components in the membrane, the prepared membrane has relatively stable physicochemical properties, and the pore environment for water transport is clearly defined. The transport mechanism of water through Ti-CAT channels can be calculated through simulation, providing a method for designing controllable water molecule transport pore size, shape, and environment. Compared with existing technologies, this invention solves or supplements the instability or inhomogeneity drawbacks of empirical attempts to prepare photothermal water production membranes, providing a method for designing materials with adjustable water transport modes and controllable transport rates from the source. This invention utilizes the polyelectrolyte PCMVIMX to bond nanoscale Ti-CAT and CNTs together to prepare a hybrid matrix membrane for photothermal water production research.

[0024] In this invention, PCMVIMX acts as a binder, enabling Ti-CAT nanoparticles and CNTs to crosslink effectively, forming a stable hybrid matrix membrane. The membrane prepared by this method exhibits significantly improved stability compared to directly coated membranes. The hybrid matrix membrane obtained using this method shows great promise for application in the promising field of photothermal water production.

[0025] This invention provides a method for preparing mixed-matrix membranes of porous and carbon materials. Typically, photothermal water production membranes are prepared using coating methods. Utilizing polyelectrolytes as binders in this method helps improve membrane stability. Stable mixed-matrix membranes are essential for practical applications in photothermal water production and are a prerequisite for widespread reuse. In this invention, although the polyelectrolyte PCMVIMX is used as a binder, the crosslinking of PCMVIMX occurs under a mild ammonia atmosphere, which does not damage other components of the membrane or reduce the water transport rate.

[0026] Third, the technical solution of the present invention effectively improves the shortcomings of poor stability and complex preparation process of mixed matrix membranes, overcomes the limitation that the water production effect of photothermal water production membranes can only be tested by trial experiments, and provides a method for designing mixed matrix membranes with good photothermal water production performance. Attached Figure Description

[0027] Figure 1 This is a flowchart of the preparation method of Ti-CAT-based hybrid matrix membrane provided in the embodiments of the present invention;

[0028] Figure 2 This is a schematic diagram illustrating the preparation method of the Ti-CAT-based hybrid matrix membrane provided in this embodiment of the invention.

[0029] Figure 3 This is a schematic diagram of the light absorption performance of the Ti-CAT / CNT@PCMVIMX hybrid matrix film provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the water production performance of the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the circulating water production performance of the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] The Ti-CAT (catecholates) based hybrid matrix membrane provided in this embodiment of the invention is made of Ti-CAT, CNT (carbon nanotube) and PCMVIMX (poly(1-Viny-3-nitrilepropyl imidazole)).

[0034] In embodiments of the present invention, X represents an anion, which can be divided into hydrophilic and hydrophobic groups.

[0035] In embodiments of the present invention, X in the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane can be a hydrophilic group including: Br, Cl, SO3, NO3, CH3COO, etc.

[0036] In embodiments of the present invention, X in the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane can be a hydrophobic group including: TFSI, BF4, PF6, BPh4, CF3COO, etc.

[0037] The following is a description of the physical and chemical properties of CAT-based hybrid matrix membranes:

[0038] 1) Physical properties:

[0039] Structural stability: The CAT-based hybrid matrix membrane formed by combining Ti-CAT, CNT and PCMVIMX has good structural stability and can maintain a stable structure under different environmental conditions.

[0040] Mechanical strength: CNTs (carbon nanotubes) have high strength and high toughness, and the film formed by mixing them with Ti-CAT and PCMVIMX has good mechanical strength.

[0041] Porosity: The nanoscale pore structure of Ti-CAT and CNT can provide high porosity, which is beneficial for mass transport and ion exchange processes.

[0042] Hydrophobic / Hydrophilic properties: The anionic portion of PCMVIMX can adjust the hydrophobicity and hydrophilicity of the membrane. Different hydrophobic / hydrophilic properties can be achieved by selecting specific anions (such as Br, Cl, SO3, NO3, CH3COO or TFSI, BF4, CF3COO, PF6, BPh4, etc.).

[0043] 2) Chemical properties:

[0044] Chemical stability: Ti-CAT has good chemical stability and can remain stable in various redox environments; CNT has good heat resistance and acid and alkali resistance; PCMVIMX has certain chemical stability, but it may be affected by the type and concentration of anions.

[0045] Ion transport performance: PCMVIMX, as an ionic liquid, has high ion transport performance, which can improve the ion transport efficiency of the membrane.

[0046] Adsorption performance: The pore structure of Ti-CAT and CNT can provide a large specific surface area, which is beneficial to the adsorption and desorption process of substances.

[0047] In summary, CAT-based hybrid matrix membranes possess favorable physical and chemical properties, including structural stability, mechanical strength, porosity, hydrophobicity / hydrophilicity, chemical stability, ion transport performance, and adsorption performance. These characteristics make them promising for broad applications in ion transport, catalysis, and adsorption.

[0048] The following are ten specific embodiments of the present invention.

[0049] Example 1: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMBr;

[0050] Example 2: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMCl;

[0051] Example 3: Hybrid matrix membranes of Ti-CAT, CNT, and PCMVIMTFSI;

[0052] Example 4: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMBF4;

[0053] Example 5: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMPF6;

[0054] Example 6: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMBPh4;

[0055] Example 7: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMSO3;

[0056] Example 8: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMNO3;

[0057] Example 9: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMCH3COO;

[0058] Example 10: A mixed matrix membrane of Ti-CAT, CNT and PCMVIMCF3COO.

[0059] These 10 examples employ different hydrophilic groups (Br, Cl, SO3, NO3, CH3COO, etc.) and hydrophobic groups (TFSI, BF4, PF6, CF3COO, BPh4, etc.) to adjust the hydrophilicity and lipophilicity of the CAT-based mixed matrix membrane, achieving different properties.

[0060] like Figure 1 As shown, the method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention involves crosslinking a one-dimensional porous metal-organic framework Ti-CAT with CNTs, using PCMVIMX as a binder, and preparing the hybrid matrix membrane in an ammonia atmosphere. The specific steps include:

[0061] S101: Adjust Ti-CAT, CNT, and PCMVIMX proportionally;

[0062] S102: PCMVIMX has the property of self-crosslinking under ammonia conditions, which acts as a binder to bond nanoscale Ti-CAT and CNT together. Based on the property of cyano groups in polyelectrolyte PCMVIMX crosslinking into triazine rings, a CAT-based mixed matrix membrane is prepared.

[0063] In embodiments of the present invention, the ammonia gas is derived from 0.2wt%-14wt% ammonia water.

[0064] In an embodiment of the present invention, the reaction time is 10 min to 14 hours.

[0065] In an embodiment of the present invention, Ti-CAT in the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane can act as a water molecule transport channel, reducing the enthalpy of water molecule evaporation.

[0066] In an embodiment of the present invention, CNTs in the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane act as solar absorbers, increasing the membrane surface temperature and facilitating water evaporation.

[0067] In embodiments of the present invention, water production studies for different pH water sources include pH = 1 to 13.

[0068] Example 1:

[0069] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0070] Step 1: Dissolve PCMVIMTFSI in DMF solution to prepare a 0.025 wt% solution;

[0071] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0072] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain the Ti-CAT / CNT@PCMVIMTFSI hybrid matrix membrane;

[0073] Step 4: Dry the Ti-CAT / CNT@PCMVIMTFSI hybrid matrix membrane in an oven at 80°C for half an hour;

[0074] Step 5: The dried Ti-CAT / CNT@PCMVIMTFSI hybrid matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMTFSI hybrid matrix membrane;

[0075] In this embodiment of the invention, a Ti-CAT / CNT@PCMVIMTFSI hybrid matrix membrane is placed on a foam support for photothermal water production experiments.

[0076] Example 2:

[0077] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0078] Step 1: Dissolve PCMVIMBF4 in DMF solution to prepare a 0.025 wt% solution;

[0079] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0080] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain a Ti-CAT / CNT@PCMVIMBF4 mixed matrix membrane;

[0081] Step 4: Dry the Ti-CAT / CNT@PCMVIMBF4 mixed matrix membrane in an oven at 80℃ for half an hour;

[0082] Step 5: The dried Ti-CAT / CNT@PCMVIMBF4 mixed matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMBF4 mixed matrix membrane;

[0083] The Ti-CAT / CNT@PCMVIMBF4 hybrid matrix membrane of this invention is placed on a foam support for photothermal water production experiments.

[0084] Example 3:

[0085] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0086] Step 1: Dissolve PCMVIMPF6 in DMF solution to prepare a 0.025 wt% solution;

[0087] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0088] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain the Ti-CAT / CNT@PCMVIMPF6 mixed matrix membrane;

[0089] Step 4: Dry the Ti-CAT / CNT@PCMVIMPF6 mixed matrix membrane in an oven at 80℃ for half an hour;

[0090] Step 5: The dried Ti-CAT / CNT@PCMVIMPF6 mixed matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMPF6 mixed matrix membrane;

[0091] The Ti-CAT / CNT@PCMVIMPF6 hybrid matrix membrane of this invention is placed on a foam support and used for photothermal water production experiments.

[0092] Example 4:

[0093] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0094] Step 1: Dissolve PCMVIMBPh4 in DMF solution to prepare a 0.025 wt% solution;

[0095] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0096] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain the Ti-CAT / CNT@PCMVIMBPh4 mixed matrix membrane;

[0097] Step 4: Dry the Ti-CAT / CNT@PCMVIMBPh4 mixed matrix membrane in an oven at 80℃ for half an hour;

[0098] Step 5: The dried Ti-CAT / CNT@PCMVIMBPh4 mixed matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMBPh4 mixed matrix membrane.

[0099] The Ti-CAT / CNT@PCMVIMBPh4 hybrid matrix membrane of this invention is placed on a foam support for photothermal water production experiments.

[0100] Example 5:

[0101] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0102] Step 1: Dissolve PCMVIMBr in an aqueous solution to prepare a 0.025 wt% solution;

[0103] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0104] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain the Ti-CAT / CNT@PCMVIMBr mixed matrix membrane;

[0105] Step 4: The Ti-CAT / CNT@PCMVIMBr mixed matrix membrane is dried in an oven at 80℃ for half an hour;

[0106] Step 5: The dried Ti-CAT / CNT@PCMVIMBr hybrid matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMBr hybrid matrix membrane;

[0107] The Ti-CAT / CNT@PCMVIMBr hybrid matrix membrane of this invention is placed on a foam support for photothermal water production experiments.

[0108] Example 6:

[0109] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0110] Step 1: Dissolve PCMVIMCl in an aqueous solution to prepare a 0.025 wt% solution;

[0111] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0112] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain the Ti-CAT / CNT@PCMVIMCl mixed matrix membrane;

[0113] Step 4: Dry the Ti-CAT / CNT@PCMVIMCl mixed matrix membrane in an oven at 80℃ for half an hour;

[0114] Step 5: The dried Ti-CAT / CNT@PCMVIMCl hybrid matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMCl hybrid matrix membrane;

[0115] The Ti-CAT / CNT@PCMVIMCl hybrid matrix membrane of this invention is placed on a foam support and used for photothermal water production experiments.

[0116] Example 7:

[0117] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0118] Step 1: Dissolve PCMVIMSO3 in an aqueous solution to prepare a 0.025 wt% solution;

[0119] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0120] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain a Ti-CAT / CNT@PCMVIMSO3 mixed matrix membrane;

[0121] Step 4: Dry the Ti-CAT / CNT@PCMVIMSO3 mixed matrix membrane in an oven at 80℃ for half an hour;

[0122] Step 5: The dried Ti-CAT / CNT@PCMVIMSO3 mixed matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMSO3 mixed matrix membrane;

[0123] The Ti-CAT / CNT@PCMVIMSO3 hybrid matrix membrane of this invention is placed on a foam support for photothermal water production experiments.

[0124] Example 8:

[0125] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0126] Step 1: Dissolve PCMVIMNO3 in an aqueous solution to prepare a 0.025 wt% solution;

[0127] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0128] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain the Ti-CAT / CNT@PCMVIMNO3 mixed matrix membrane;

[0129] Step 4: Dry the Ti-CAT / CNT@PCMVIMNO3 mixed matrix membrane in an oven at 80℃ for half an hour;

[0130] Step 5: The dried Ti-CAT / CNT@PCMVIMNO3 mixed matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIMNO3 mixed matrix membrane;

[0131] The Ti-CAT / CNT@PCMVIMNO3 hybrid matrix membrane of this invention is placed on a foam support and used for photothermal water production experiments.

[0132] Example 9:

[0133] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0134] Step 1: Dissolve PCMVIM(CH3COO) in an aqueous solution to prepare a 0.025 wt% solution;

[0135] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0136] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain a Ti-CAT / CNT@PCMVIM(CH3COO) mixed matrix membrane;

[0137] Step 4: The Ti-CAT / CNT@PCMVIM(CH3COO) mixed matrix membrane is dried in an oven at 80℃ for half an hour;

[0138] Step 5: The dried Ti-CAT / CNT@PCMVIM(CH3COO) mixed matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIM(CH3COO) mixed matrix membrane;

[0139] The Ti-CAT / CNT@PCMVIM(CH3COO) hybrid matrix membrane of this invention is placed on a foam support for photothermal water production experiments.

[0140] Example 10:

[0141] The method for preparing a CAT-based hybrid matrix membrane provided in this embodiment of the invention includes the following steps:

[0142] Step 1: Dissolve PCMVIM (CF3COO) in an aqueous solution to prepare a 0.025 wt% solution;

[0143] Step 2: Add the prepared solution to the mixture of Ti-CAT and carbon nanotubes (CNTs) and sonicate to prepare a homogeneous suspension.

[0144] Step 3: Pour the above suspension into a vacuum filtration flask, and after filtration, obtain a Ti-CAT / CNT@PCMVIM(CF3COO) mixed matrix membrane;

[0145] Step 4: The Ti-CAT / CNT@PCMVIM(CF3COO) hybrid matrix membrane is dried in an oven at 80°C for half an hour;

[0146] Step 5: The dried Ti-CAT / CNT@PCMVIM(CF3COO) hybrid matrix membrane is crosslinked in an ammonia atmosphere to obtain the final Ti-CAT / CNT@PCMVIM(CF3COO) hybrid matrix membrane;

[0147] The Ti-CAT / CNT@PCMVIM(CF3COO) hybrid matrix membrane of this invention is placed on a foam support for photothermal water production experiments.

[0148] In an embodiment of the present invention, the prepared Ti-CAT / CNT@PCMVIMX hybrid matrix membrane was used for water production studies of water sources with different pH values. Its water production effect was comparable to that in pure water, and the membrane still maintained its original structure after being treated with water of different pH values, proving that the water production membrane structure is stable and can be used for photothermal water production.

[0149] In the embodiments of the present invention, the prepared Ti-CAT / CNT@PCMVIMX hybrid matrix membrane was used for water production studies of different actual water sources. Its water production effect was comparable to that in pure water, and the membrane still maintained its original structure after being treated with water of different pH values, proving that the water production membrane structure is stable and can be used for photothermal water production.

[0150] In the embodiments of the present invention, the preparation method of the Ti-CAT / CNT@PCMVIMX hybrid matrix membrane and its photothermal water production application are used for water production research of different actual water sources, including lake water, seawater, river water, domestic wastewater, etc. The water production effect is comparable to that in pure water, and the membrane still maintains its original structure after being treated with water of different pH values, proving that the water production membrane structure is stable and can be used for photothermal water production.

[0151] The Ti-CAT / CNT@PCMVIMX hybrid matrix membrane can achieve a maximum water production rate of 2.56 kg·m³. -2 ·h -1 The water production rate is at a mid-to-high level compared to published literature. Furthermore, the water production rate remains at this level after 24 hours of cycling, demonstrating that the water-producing membrane possesses good cycling and structural stability. Theoretical calculations can reveal the interaction between water molecules and the inner wall of the Ti-CAT pores as they pass through them.

[0152] Figure 2 The preparation process of Ti-CAT / CNT@PCMVIMX involves filtering the mixed solution to obtain the initial mixed matrix membrane, followed by treatment in an ammonia atmosphere for 10 min-14 hours to obtain a photothermal water production membrane for standby.

[0153] Figure 3 The light absorption performance of the Ti-CAT / CNT@PCMVIMX hybrid matrix film in the UV-Vis range (200-800nm) is shown in the figure. The light absorption effect is taken as an example of Ti-CAT / CNT@PCMVIMBr, and the light absorption efficiency is greater than 80% in the entire range, which proves the good light absorption performance of the film.

[0154] Figure 4Taking Ti-CAT / CNT@PCMVIMBr as an example, the photothermal water production effect shows that the water production rate of the mixed matrix membrane is 0.4 kg·m³ compared to pure water and the substrate membrane. -2 ·h -1 Increased to 2.56 kg·m -2 ·h -1 .

[0155] Figure 5 Taking Ti-CAT / CNT@PCMVIMBr as an example, the photothermal cycling water production effect shows that after 24 hours of continuous cycling, the water production rate of the mixed matrix membrane remains at 2.56 kg·m³. -2 ·h -1 about.

[0156] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A CAT-based hybrid matrix membrane, characterized in that, The CAT-based hybrid matrix membrane is made of Ti-CAT, CNT and PCMVIMX; X represents an anion, which is divided into hydrophilic and hydrophobic groups; X represents hydrophilic groups including: Br, Cl, SO3, NO3, CH3COO; X represents hydrophobic groups, including: TFSI, BF4, PF6, CF3COO, BPh4.

2. A method for preparing a CAT-based hybrid matrix membrane as described in claim 1, characterized in that, The method for preparing the CAT-based hybrid matrix membrane uses a three-dimensional network structure Ti-CAT as a water transport channel, CNTs as a solar absorber to increase the light absorption of the membrane, and utilizes the self-crosslinking property of PCMVIMX under ammonia conditions as a binder to crosslink CAT and CNT together; by compositing a one-dimensional porous metal-organic framework Ti-CAT with CNTs, using PCMVIMX as a binder, and crosslinking in an ammonia atmosphere, a hybrid matrix membrane is prepared.

3. The method for preparing the CAT-based hybrid matrix membrane as described in claim 2, characterized in that, The specific preparation method of the CAT-based hybrid matrix membrane Includes the following steps: The first step is to adjust Ti-CAT, CNT, and PCMVIMX according to the specified ratio; In the second step, PCMVIMX has the property of self-crosslinking under ammonia conditions, which acts as a binder to bond nanoscale Ti-CAT and CNT together. Based on the property of cyano groups in polyelectrolyte PCMVIMX crosslinking into triazine rings, a CAT-based mixed matrix membrane is prepared.

4. The method for preparing the CAT-based hybrid matrix membrane as described in claim 3, characterized in that, The ammonia gas is derived from 0.2wt%-14wt% ammonia water.

5. The method for preparing a CAT-based hybrid matrix membrane as described in claim 2, characterized in that, The reaction time is 10 min to 14 hours.

6. The application of the CAT-based hybrid matrix membrane as described in claim 1 in the product water of water sources with different pH values.

7. The application of the CAT-based hybrid matrix membrane as described in claim 1 in the product water of different actual water sources.

8. An application of the CAT-based hybrid matrix membrane as described in claim 1 for water production from different actual water sources, including lake water, seawater, river water, and domestic wastewater.

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