A modified filtration integrated device and a method for preparing a reverse osmosis composite membrane thereof

Abstract

A modified integrated filtration device and a method for preparing a reverse osmosis composite membrane thereof. The scheme comprises a shell with a water outlet and a water inlet at both ends, a reverse osmosis composite membrane composed of a common RO membrane, a graphene hydrogel composite layer and a modified reverse osmosis membrane, a driving device, a power device and a water quality monitoring device, and a reverse osmosis membrane preparation method comprising the steps of raw material preparation, pretreatment and adsorption, polymerization reaction and membrane modification. The reverse osmosis composite membrane prepared by the interfacial polymerization method in the present application has reduced surface roughness and increased hydrophilicity, thereby improving filtration efficiency and desalination effect, and can more effectively remove salt and other impurities in seawater, making the desalinated water quality purer. In addition, the modified integrated filtration device is easy to carry and can adapt to different application scenarios.

Description

Technical Field

[0001] The present invention relates to a modified filtration integrated device and a method for preparing a reverse osmosis composite membrane thereof, belonging to the technical field of seawater desalination, in particular to a convenient device for desalinating seawater using a modified reverse osmosis membrane, which can improve the hydrophilicity of the reverse osmosis membrane. Background Art

[0002] With the increasing shortage of global water resources, seawater desalination technology has become one of the important means to solve the problem of freshwater supply. Although the existing portable seawater desalination devices have met the needs of outdoor and emergency scenarios to a certain extent, they still have some shortcomings. For example, the filtration efficiency of some devices is not high, resulting in less than ideal water quality after desalination; the reverse osmosis membranes of some devices have problems such as high surface roughness and insufficient hydrophilicity, which affect the performance and service life of the membrane, and thus reduce the desalination effect and stability of the entire device. In order to solve the above problems, the present invention proposes a thermos-type portable seawater desalination device and a modified reverse osmosis membrane thereof. The composite membrane is prepared by adopting the interfacial polymerization method, and the reverse osmosis membrane is modified to improve its performance and desalination effect. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a modified filtration integrated device and a reverse osmosis composite membrane preparation method thereof to solve the problems of high surface roughness and insufficient hydrophilicity of the existing reverse osmosis membrane.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solution: a device integrating modification and filtration, characterized in that it includes:

[0005] The shell is a can body with a hollow center, and a cup body is nested inside the can body to form a sandwich layer between the two. The shell is used to provide a protective shell and load the modified filtration integrated device;

[0006] A reverse osmosis composite membrane, which is composed of a conventional RO membrane, a graphene hydrogel composite layer, and a modified reverse osmosis membrane from top to bottom. The three layers form a highly cross-linked network structure and are clamped together at the center of the cup body. The reverse osmosis composite membrane uses the membrane's selective permeability to efficiently filter and desalinate seawater.

[0007] A driving device, which is clamped at the front end of the cup body and is used to pressurize and transfer the seawater absorbed by the modified and filtered integrated device to the reverse osmosis composite membrane for filtration;

[0008] A power device, the power device is used to provide power to the driving device;

[0009] A water quality monitoring device is fixedly arranged in the interlayer between the shell and the cup body, and is used to monitor the water quality of the fresh water output by the modified and filtered integrated device.

[0010] Furthermore, a display screen is provided on the side of the shell, and the display screen includes one or more operating parameters including pressure, flow, battery power, and water quality parameters.

[0011] Furthermore, a pre-filter and a post-filter are provided on the left and right sides of the reverse osmosis composite membrane. The pre-filter is used to filter large particles of impurities in seawater, and the post-filter is used to further purify the desalinated water.

[0012] Furthermore, a fixing plate is annularly clamped on the outer surface of the cup body, and a water inlet and a water outlet are respectively connected at both ends of the shell and the cup body.

[0013] Furthermore, the power device is a plurality of batteries connected in parallel and fixed on a fixed plate, and the fixed plate is also provided with a plurality of battery slots and a single cup slot for placing a cup body.

[0014] Furthermore, the driving device is one of a manual pump, an electric pump or a solar driving device.

[0015] Furthermore, the water quality monitoring device includes a conductivity meter and a turbidity meter. The higher the conductivity detected by the conductivity meter, the higher the ion concentration and salt content in the water; the lower the turbidity detected by the turbidity meter, the lower the impurity content in the water.

[0016] A method for preparing a reverse osmosis composite membrane comprises the following steps:

[0017] S1. Raw material preparation: prepare two immiscible solutions, specifically a 1-2 wt% aqueous solution of m-phenylenediamine and a 0.1-0.3 wt% organic solution of trimesoyl chloride;

[0018] S2. Pretreatment and adsorption: The graphene hydrogel is made into a porous support and immersed in deionized water to fully wet it. The support is then pretreated by ultrasonic cleaning and ethanol. The pretreated porous support is then immersed in an aqueous solution containing m-phenylenediamine and allowed to stand for a period of time until a uniform and dense m-phenylenediamine adsorption layer is formed.

[0019] S3, polymerization reaction: The porous support adsorbed with m-phenylenediamine is removed from the aqueous solution and quickly immersed in an organic solution containing trimesoyl chloride. A polymerization reaction occurs at the interface of the two immiscible solvents to form a preliminary polyamide film;

[0020] S4, membrane modification: After the polymerization reaction is completed, the porous support with the preliminary polyamide film is removed from the organic solution, washed, dried, heat-treated and surface modified to obtain a modified reverse osmosis membrane with a polymer film formed on the surface;

[0021] Among them, a reverse osmosis composite membrane was prepared through photocatalytic treatment, polymerization reaction and membrane modification, with reduced surface roughness and improved hydrophilicity, thereby improving filtration efficiency and desalination effect, and being able to more effectively remove salt and other impurities in seawater.

[0022] Furthermore, the porous support is prepared from graphene hydrogel by a photocatalytic process, and the photocatalytic process specifically comprises the following steps:

[0023] S1. Preparation of graphene hydrogel: dispersing graphene oxide in deionized water to form a uniform graphene oxide aqueous solution, and reducing the graphene oxide to graphene by chemical reduction or photocatalytic reduction to form a three-dimensional porous hydrogel structure;

[0024] S2. Photocatalytic treatment: The prepared graphene hydrogel is placed under ultraviolet light for photocatalytic treatment to form a graphene hydrogel composite layer. The photocatalytic treatment time is 10-60 minutes and the light intensity is 10-50 mW / cm 2 .

[0025] The beneficial effects of the present invention are:

[0026] 1. Reduced Surface Roughness: The surface roughness of the modified reverse osmosis membrane produced by interfacial polymerization is significantly reduced. Traditional reverse osmosis membranes, due to their high surface roughness, are prone to the adhesion and accumulation of pollutants, thereby reducing the membrane's filtration efficiency and service life. The modified membrane has a smoother surface, reducing the number of pollutant attachment points, lowering the risk of membrane fouling, and improving membrane stability and durability.

[0027] 2. Improved hydrophilicity: The hydrophilicity of the reverse osmosis composite membrane is significantly improved. Hydrophilicity is one of the important factors affecting membrane filtration performance. The higher the hydrophilicity of the membrane surface, the easier it is to be wetted by water, thereby reducing the surface tension of water, reducing energy consumption, and increasing water flux. The highly hydrophilic membrane surface can effectively inhibit the attachment of organic matter and biological pollutants, further extending the service life of the membrane.

[0028] 3. Improved filtration efficiency: The filtration efficiency of the reverse osmosis composite membrane is significantly improved due to the reduced surface roughness and increased hydrophilicity. The smooth membrane surface and excellent hydrophilicity allow water molecules to pass through the membrane pores more smoothly, while effectively blocking the passage of salt and other impurities. This efficient filtration performance ensures that the desalinated water quality is purer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0030] Figure 1 This is a schematic diagram of the internal structure of a modification and filtration integrated device of the present invention;

[0031] Figure 2 This is a schematic diagram of the external structure of a modification and filtration integrated device of the present invention;

[0032] Figure 3 Schematic diagram of the structure of the reverse osmosis composite membrane of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the fixing plate of the present invention;

[0034] Figure 5 The present invention is a schematic flow chart of a method for preparing a reverse osmosis membrane.

[0035] The accompanying drawings are numerals as follows: 1. Shell; 11. Water inlet; 12. Water outlet; 13. Display screen; 14. Cup body; 141. Cup body groove; 2. Reverse osmosis composite membrane; 21. Ordinary RO membrane; 22. Graphene hydrogel composite layer; 23. Modified reverse osmosis membrane; 24. Pre-filter; 25. Post-filter; 3. Driving device; 4. Power device; 41. Fixing plate; 42. Battery slot; 5. Water quality monitoring device; 6. Snap-in block. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0037] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, in order to achieve efficient seawater desalination, the present invention also provides a modified and filtered integrated device, which is characterized in that it includes:

[0038] The housing 1 is a hollowed-out can body with a cup 14 nested inside to form a sandwich. The housing 1 is used to provide a protective shell and hold the modified filtration integrated device.

[0039] The reverse osmosis composite membrane 2 is composed of a conventional RO membrane 21, a graphene hydrogel composite layer 22, and a modified reverse osmosis membrane 23 from top to bottom. The three components form a highly cross-linked network structure and are clamped to the center of the cup body 14. The reverse osmosis composite membrane 2 efficiently filters and desalinates seawater through the selective permeability of the membrane.

[0040] A driving device 3 is clamped at the front end of the cup body 14 and is used to pressurize and transfer the seawater absorbed by the modified and filtered integrated device to the reverse osmosis composite membrane 2 for filtration;

[0041] A power device 4, the power device 4 is used to provide power for the driving device 3;

[0042] The water quality monitoring device 5 is fixedly arranged in the interlayer between the shell 1 and the cup body 14, and is used to monitor the water quality of the fresh water output by the modification and filtration integrated device.

[0043] In order to monitor the operating status of the device in real time, a display screen 13 is provided on the side of the housing 1. The display screen 13 includes one or more operating parameters including pressure, flow, battery power, and water quality parameters.

[0044] In order to further improve the water quality, a pre-filter 24 and a post-filter 25 are provided on the left and right sides of the reverse osmosis composite membrane 2. The pre-filter 24 is used to filter large particles of impurities in the seawater, thereby protecting the reverse osmosis membrane from physical damage and extending the service life of the membrane. The post-filter 25 is used to further purify the desalinated water.

[0045] In order to facilitate the fixation between the cup body and the shell, a fixing plate 41 is provided in an outer ring of the cup body 14 . The shell 1 and the cup body 14 are connected at both ends with a water inlet 11 and a water outlet 12 .

[0046] In order to provide power, the power device 4 is a plurality of batteries connected in parallel and fixed on a fixing plate 41 . The fixing plate 41 is also provided with a plurality of battery slots 42 and a single cup slot 141 for placing the cup 14 .

[0047] In order to adapt to different usage scenarios, the driving device 3 is one of a manual pump, an electric pump or a solar driving device.

[0048] In order to accurately detect the water quality, the water quality monitoring device 5 includes a conductivity meter and a turbidity meter. The higher the conductivity detected by the conductivity meter, the higher the ion concentration in the water and the higher the salt content; the lower the turbidity detected by the turbidity meter, the less impurities in the water.

[0049] like Figure 4 As shown, the present invention provides a method for preparing a reverse osmosis composite membrane, and the method for preparing the reverse osmosis composite membrane 2 comprises the following steps:

[0050] S1. Raw material preparation: prepare two immiscible solutions, specifically a 1-2 wt% aqueous solution of m-phenylenediamine and a 0.1-0.3 wt% organic solution of trimesoyl chloride;

[0051] S2. Pretreatment and adsorption: The graphene hydrogel is made into a porous support and immersed in deionized water to fully wet it. The support is then pretreated by ultrasonic cleaning and ethanol. The pretreated porous support is then immersed in an aqueous solution containing m-phenylenediamine and allowed to stand for a period of time until a uniform and dense m-phenylenediamine adsorption layer is formed.

[0052] S3, polymerization reaction: The porous support adsorbed with m-phenylenediamine is removed from the aqueous solution and quickly immersed in an organic solution containing trimesoyl chloride. A polymerization reaction occurs at the interface of the two immiscible solvents to form a preliminary polyamide film;

[0053] S4, membrane modification: After the polymerization reaction is completed, the porous support with the preliminary polyamide film is removed from the organic solution, washed, dried, heat-treated and surface-modified to obtain a modified reverse osmosis membrane 23 with a polymer film formed on the surface;

[0054] Among them, the reverse osmosis composite membrane 2 is prepared through photocatalytic treatment, polymerization reaction and membrane modification, and the surface roughness is reduced and the hydrophilicity is improved, thereby improving the filtration efficiency and desalination effect, and can more effectively remove salt and other impurities in seawater.

[0055] In order to improve the hydrophilicity and anti-pollution ability of the membrane, the porous support is prepared from graphene hydrogel by a photocatalytic process, and the photocatalytic process specifically includes the following steps:

[0056] S1. Preparation of graphene hydrogel: dispersing graphene oxide in deionized water to form a uniform graphene oxide aqueous solution, and reducing the graphene oxide to graphene by chemical reduction or photocatalytic reduction to form a three-dimensional porous hydrogel structure;

[0057] S2. Photocatalytic treatment: The prepared graphene hydrogel is placed under ultraviolet light for photocatalytic treatment to form a graphene hydrogel composite layer 22. The photocatalytic treatment time is 10-60 minutes, and the light intensity is 10-50 mW / cm 2 .

[0058] In order to ensure uniform and stable film formation, in the polymerization reaction step, the polymerization reaction time is 20-40s and the reaction temperature is 20-30°C to ensure uniformity and stability of the film.

[0059] In order to achieve good anti-fouling properties while achieving efficient filtration, in the membrane modification step, the surface of the porous support forming the preliminary film is coated with a nano-scale hydrophobic coating with a thickness of 20-30 nm to balance anti-fouling performance and membrane flux.

[0060] In the modified and filtered integrated device of the present application, seawater enters the device through the water inlet 11 at the top of the shell 1, and the driving device 3 provides pressure for the seawater to push the seawater into the reverse osmosis composite membrane 2. The device fixes the reverse osmosis composite membrane 2 in the clamping groove on the inner side of the cup body 14 through the clamping block 6. A pre-filter 24 and a post-filter 25 are also provided on the left and right sides of the reverse osmosis composite membrane, and a number of through holes are provided on both end sides of the pre-filter 24 and the post-filter 25.

[0061] The seawater first enters the inner side of the filter through the through holes on the left and right ends of the pre-filter 24 to remove large particles of impurities (such as sand, suspended matter, etc.) in the seawater. The pre-filtered seawater enters the reverse osmosis composite membrane 2, and the pre-filtered seawater enters the ordinary RO membrane 21 (used to remove most of the salt and large particles in the seawater, reduce the salinity of the seawater, and provide preliminary purification for subsequent filtration). It then passes through the graphene hydrogel composite layer 22 (this layer is prepared by a photocatalytic process and has a three-dimensional porous structure, which can further improve the hydrophilicity and anti-fouling properties of the membrane). The desalinated water passes through a post-filter 25 to remove any remaining trace impurities and odor, further improving the water quality and ensuring that the desalinated water meets drinking water standards. The fresh water that has undergone multiple layers of filtration and purification is discharged through the water outlet 12 at the bottom of the housing 1 for use by users.

[0062] The drive device 3 of the present application is a manual pump, an electric pump, or a solar-powered drive. The manual pump is suitable for emergency situations or power-off environments, being lightweight, portable, and easy to operate. The electric pump is suitable for fixed locations, providing stable power and high efficiency to meet continuous fresh water needs. The solar-powered drive utilizes clean energy, is energy-efficient, and is particularly suitable for outdoor or remote areas. It has no energy supply constraints and is in line with the concept of sustainable development.

[0063] In the pretreatment and adsorption steps of the present application, the porous support is first immersed in deionized water to fully wet it, and then ultrasonic cleaning technology is used to set appropriate ultrasonic power and time to deeply clean the porous support. With the help of the cavitation effect of ultrasound, the oil, impurities, dust and other tiny particles on its surface are effectively removed to improve the cleanliness of the support. After the ultrasonic cleaning is completed, the porous support is taken out and treated with an appropriate amount of ethanol for a secondary treatment. The residual organic impurities can be further dissolved and removed by soaking, wiping, etc., while reducing the risk of microbial contamination in the subsequent reaction process. After the ethanol treatment is completed, the porous support is immersed in a pre-prepared aqueous solution of m-phenylenediamine, and maintained at a set temperature for a certain time to allow the m-phenylenediamine molecules to be fully adsorbed on the surface of the porous support to form a uniform and dense m-phenylenediamine adsorption layer. In this step, the concentration of the solution, adsorption time, temperature and other parameters can be appropriately adjusted to optimize the adsorption effect and create favorable conditions for the subsequent polymerization reaction.

[0064] In the membrane modification steps of the present application, washing, drying, heat treatment and surface modification are specifically:

[0065] Washing: After the polymerization reaction is completed, the porous support with the preliminary polyamide film is removed from the organic solution and washed multiple times with an appropriate solvent to thoroughly remove the unreacted monomers, solvents and other impurities remaining on the surface to avoid adverse effects on subsequent processing and membrane performance;

[0066] Drying: Place the washed porous support in a ventilated and dry environment and dry it according to the set drying temperature and time to fully volatilize the moisture and organic solvent in the membrane, thereby achieving the fixation of the polyamide film structure;

[0067] Heat treatment: The dried porous support is placed in a specific oven, gradually heated to a set temperature under a certain temperature gradient, and maintained for a period of time. Through the heat treatment process, the molecular structure of the polyamide film can be further optimized, its crystallinity and density can be improved, thereby enhancing the mechanical strength and chemical stability of the film;

[0068] Surface modification: Use appropriate surface modification methods to modify the membrane surface. For example, through grafting modification, coating modification and other technologies, groups or substances with special properties, such as hydrophilic groups, antibacterial substances, etc., are introduced into the membrane surface to further improve the membrane's hydrophilicity, anti-pollution ability, selectivity and other comprehensive properties.

[0069] like Figure 4As shown, in this application, the power device 4 is a plurality of 18650 batteries that provide power for the driving device 3. A plurality of battery slots 42 are provided on the fixing plate 41 for placing the batteries. A cup body slot 141 that is the same size as the cup body 14 is provided at the center of the fixing plate 41 for placing the cup body 14. The fixing plate 41 is made of a hexagonal elastic material, and its shape and size are consistent with the shape and size of the shell 1. When the electromagnetic ring is fixed to the outside of the cup body 14, the cup body 14 can also be fixed inside the shell 1.

[0070] In the present application, the water quality monitoring device 5 includes a conductivity meter and a turbidity meter. The conductivity meter is mainly used to measure the conductivity of electrolytes in water. It detects the conductivity of water, which reflects the level of ion concentration in water, and indirectly indicates the salt content in water. The higher the conductivity, the higher the ion concentration in water and the higher the salt content. The turbidity meter mainly detects the degree of light scattering by impurities such as suspended particles and colloids in the water sample, that is, the turbidity of water. The lower the turbidity, the less impurities in the water and the higher the clarity of the water. In addition to being able to monitor the effluent quality of the device in real time, the water quality monitoring device 5 can also indirectly reflect the contamination of the reverse osmosis composite membrane 2. When the conductivity gradually increases or the turbidity gradually increases, it may mean that pollutants have accumulated on the surface of the reverse osmosis composite membrane 2, and timely cleaning or maintenance is required to extend the service life of the membrane.

[0071] This device cooperates with the water quality monitoring device 5 through an external controller. When the water quality monitoring device 5 detects that the reverse osmosis composite membrane 2 is contaminated, it can send an alarm to the controller to alert the operator that the reverse osmosis composite membrane 2 needs to be replaced or cleaned, thereby improving the working efficiency of the entire device.

[0072] A display screen 13 is provided on the side of the device, which displays operating parameters (such as pressure, flow, battery power and water quality parameters) in real time. The user can monitor the operating status of the device through the display screen 13 to ensure the convenience and safety of operation. In addition, the device supports data storage and wireless transmission functions. The user can remotely monitor the operating status of the device through a mobile phone app to achieve intelligent management.

[0073] Example 1:

[0074] The device using the reverse osmosis composite membrane 2 of this application was compared with the equipment on the market to filter the water source. The comparison equipment was manufactured by Zhongye Environmental Protection and Rainman. The specific comparison is as follows:

[0075]

[0076] The desalination rate of this application is as high as 99.9%, and the fresh water recovery rate is 80%, which is the highest among the three. It can remove salt from seawater more efficiently, produce purer fresh water, and meet high-quality water needs; the volume and weight of this application are smaller and lighter, easy to carry and install, and can be used in a variety of scenarios; in terms of power supply, it only requires a 12V power supply, compared with 220V and 230V, the power supply requirements are lower and easier to obtain; under the same processing volume, this application can produce more fresh water, improve the utilization rate of water resources, and reduce the cost of use. Although the price is higher than that of Zhongye Environmental Protection, the overall economic benefits and portability are far greater than Zhongye Environmental Protection's device.

[0077] This device achieves efficient seawater desalination and water purification through the synergistic effect of a modified reverse osmosis membrane 23 and a graphene hydrogel composite layer 22, combined with an efficient drive device 3 and an intelligent monitoring system. Its portability, energy efficiency, and intelligent design make it suitable for a variety of application scenarios, providing an innovative solution to the global water shortage problem.

[0078] The modified reverse osmosis membrane 23 prepared by the interfacial polymerization method in the present application has a significantly reduced surface roughness. Due to the high surface roughness of traditional reverse osmosis membranes, pollutants are easily attached and accumulated, thereby reducing the filtration efficiency and service life of the membrane. The modified membrane surface is smoother, reducing the attachment points of pollutants, reducing the risk of membrane contamination, and improving the stability and durability of the membrane.

[0079] The hydrophilicity of the reverse osmosis composite membrane 2 of the present application is significantly improved. Hydrophilicity is one of the important factors affecting the filtration performance of the membrane. The higher the hydrophilicity of the membrane surface, the easier it is to be wetted by water, thereby reducing the surface tension of water, reducing energy consumption, and increasing water flux. The highly hydrophilic membrane surface can effectively inhibit the attachment of organic matter and biological pollutants, further extending the service life of the membrane.

[0080] The reverse osmosis composite membrane 2 of the present application has significantly improved filtration efficiency due to reduced surface roughness and increased hydrophilicity. The smooth membrane surface and excellent hydrophilicity allow water molecules to pass through the membrane pores more smoothly, while effectively blocking the passage of salt and other impurities. This efficient filtration performance ensures that the desalinated water quality is purer.

[0081] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be included within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0082] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A modified filtration integrated device, characterized in that: It includes: A shell (1), the shell (1) is a can body with a hollowed-out middle portion, a cup body (14) is nested inside the can body, and a sandwich is formed between the two, the shell (1) is used to provide a protective shell and to carry the modified filtering integrated device; A reverse osmosis composite membrane (2), wherein the reverse osmosis composite membrane (2) comprises, from top to bottom, a common RO membrane (21), a graphene hydrogel composite layer (22), and a modified reverse osmosis membrane (23), the three mutually forming a highly cross-linked network structure and being clamped and arranged at the center position inside the cup body (14), and the reverse osmosis composite membrane (2) efficiently filters and desalinates seawater through the selective permeability of the membrane; A driving device (3), the driving device (3) being snap-connected to the front end of the cup body (14) and used to pressurize and transfer the seawater absorbed by the modified filtration integrated device to the reverse osmosis composite membrane (2) for filtration; A power device (4), the power device (4) is used to provide power for the driving device (3); A water quality monitoring device (5), the water quality monitoring device (5) being fixedly arranged in the interlayer between the housing (1) and the cup body (14), and being used to monitor the water quality of fresh water outputted by the modified filtration integrated device; The method for preparing the reverse osmosis composite membrane (2) comprises the following steps: S1. Raw material preparation: prepare two immiscible solutions, specifically a 1-2 wt% aqueous solution of m-phenylenediamine and a 0.1-0.3 wt% organic solution of trimesoyl chloride; S2. Pretreatment and adsorption: After preparing the graphene hydrogel through a photocatalytic process to obtain a porous support, the porous support is immersed in deionized water to fully wet it, and then pretreated by ultrasonic cleaning and ethanol. The pretreated porous support is immersed in an aqueous solution containing m-phenylenediamine and allowed to stand for a period of time until a uniform and dense m-phenylenediamine adsorption layer is formed; S3, polymerization reaction: The porous support adsorbed with m-phenylenediamine is removed from the aqueous solution and quickly immersed in an organic solution containing trimesoyl chloride. A polymerization reaction occurs at the interface of the two immiscible solvents to form a preliminary polyamide film; S4, membrane modification: After the polymerization reaction is completed, the porous support with the preliminary polyamide film is taken out from the organic solution, washed, dried, heat-treated and surface modified to obtain a modified reverse osmosis membrane with a polymer film formed on the surface (23); Among them, a reverse osmosis composite membrane (2) is prepared through photocatalytic treatment, polymerization reaction and membrane modification, and the surface roughness is reduced and the hydrophilicity is improved, thereby improving the filtration efficiency and desalination effect, and being able to more effectively remove salt and other impurities in seawater.

2. The modification and filtration integrated device according to claim 1, characterized in that: A display screen (13) is provided on the side of the housing (1), and the display screen (13) includes one or more operating parameters including pressure, flow, battery power, and water quality parameters.

3. The modification and filtration integrated device according to claim 1, characterized in that: A pre-filter (24) and a post-filter (25) are further provided on the left and right sides of the reverse osmosis composite membrane (2). The pre-filter (24) is used to filter large particles of impurities in seawater, and the post-filter (25) is used to further purify the desalinated water.

4. The modification and filtration integrated device according to claim 1, characterized in that: The cup body (14) is annularly clamped with a fixing plate (41), and the shell (1) and the cup body (14) are respectively connected with a water inlet (11) and a water outlet (12) at both ends.

5. The modification and filtration integrated device according to claim 4, characterized in that: The power device (4) comprises a plurality of batteries connected in parallel and fixedly mounted on a fixed plate (41). The fixed plate (41) is further provided with a plurality of battery slots (42) and a single cup body slot (141) for accommodating a cup body (14).

6. The modification and filtration integrated device according to claim 1, characterized in that: The driving device (3) is one of a manual pump, an electric pump or a solar driving device.

7. The integrated modification and filtration device according to claim 1, characterized in that: The water quality monitoring device (5) includes a conductivity meter and a turbidity meter. The higher the conductivity detected by the conductivity meter, the higher the ion concentration in the water and the higher the salt content; the lower the turbidity detected by the turbidity meter, the lower the impurity content in the water.

8. A method for preparing a reverse osmosis composite membrane, for preparing a reverse osmosis composite membrane (2) in a modified filtration integrated device as claimed in any one of claims 1 to 7, characterized in that: The method for preparing the reverse osmosis composite membrane (2) comprises the following steps: S1. Raw material preparation: prepare two immiscible solutions, specifically a 1-2 wt% aqueous solution of m-phenylenediamine and a 0.1-0.3 wt% organic solution of trimesoyl chloride; S2. Pretreatment and adsorption: After preparing the graphene hydrogel through a photocatalytic process to obtain a porous support, the porous support is immersed in deionized water to fully wet it, and then pretreated by ultrasonic cleaning and ethanol. The pretreated porous support is immersed in an aqueous solution containing m-phenylenediamine and allowed to stand for a period of time until a uniform and dense m-phenylenediamine adsorption layer is formed; S3, polymerization reaction: The porous support adsorbed with m-phenylenediamine is removed from the aqueous solution and quickly immersed in an organic solution containing trimesoyl chloride. A polymerization reaction occurs at the interface of the two immiscible solvents to form a preliminary polyamide film; S4, membrane modification: After the polymerization reaction is completed, the porous support with the preliminary polyamide film is taken out from the organic solution, washed, dried, heat-treated and surface modified to obtain a modified reverse osmosis membrane with a polymer film formed on the surface (23); Among them, a reverse osmosis composite membrane (2) is prepared through photocatalytic treatment, polymerization reaction and membrane modification, and the surface roughness is reduced and the hydrophilicity is improved, thereby improving the filtration efficiency and desalination effect, and being able to more effectively remove salt and other impurities in seawater.

9. The method for preparing a reverse osmosis composite membrane according to claim 8, wherein: The photocatalytic process specifically includes the following steps: S1. Preparation of graphene hydrogel: dispersing graphene oxide in deionized water to form a uniform graphene oxide aqueous solution, and reducing the graphene oxide to graphene by chemical reduction or photocatalytic reduction to form a three-dimensional porous hydrogel structure; S2. Photocatalytic treatment: The prepared graphene hydrogel is placed under ultraviolet light for photocatalytic treatment to form a graphene hydrogel composite layer (22). The photocatalytic treatment time is 10-60 minutes and the light intensity is 10-50 mW / cm 2 .

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