4572results about "Reverse osmosis" patented technology

The invention discloses a preparation method of a reverse osmosis membrane and the reverse osmosis membrane. The preparation method comprises the following steps: (1) adding polyethersulfone into N, N-dimethylacetamide in a heating and stirring state, and stirring for a period of time after charging is completed, so as to obtain a mixed solution; (2) cooling the mixed solution, continuing to add a pore-foaming agent, and stirring for a period of time after charging is completed to obtain a precursor solution; (3) performing vacuum defoaming treatment on the precursor solution to obtain a membrane casting solution; (4) loading the membrane casting solution on a carrier, and then carrying out gel bath treatment to obtain a base membrane; and (5) performing polyamide treatment on the surface of the base membrane to obtain the reverse osmosis membrane. The preparation method disclosed by the invention is simple in process and low in material cost, and the obtained reverse osmosis membrane has more uniform and more through-type pore structures, higher separation efficiency, more excellent chemical stability and better mechanical properties, can adapt to higher operation pressure, and can continuously and stably operate at higher flux under high pressure.

The invention provides a method and a system for intelligently interactively controlling water production equipment. Wherein heavy metal ion concentration data is collected in real time through a multi-node sensing array, concentration difference fluctuation of adjacent monitoring points is analyzed, and a pollutant diffusion track is deduced; when the monitoring data exceeds the standard, switching of a standby water source is triggered based on a diffusion trajectory analysis result, and a reverse cleaning instruction is generated in combination with the dynamic ratio of the concentration gradient change rate to the diffusion speed; dynamically correcting the concentration deviation by utilizing fluid mechanics parameters in a high-pressure impact process in cooperation with multi-dimensional sensor data, and generating environmental response type pollution grade parameters; finally, a pollutant migration path in the three-dimensional diffusion model is matched according to the pollution level, a decision signal containing emergency water source coordinates and the cleaning priority is output, and full-process closed-loop intelligent control from pollution monitoring to emergency decision is achieved. According to the technical scheme provided by the invention, the response speed and the disposal accuracy of the water quality sudden pollution event are improved.

The invention relates to a water inlet separation net, a reverse osmosis membrane unit, a reverse osmosis membrane element, a filter element and a filter system in the technical field of reverse osmosis membranes. The reverse osmosis membrane unit comprises a water inlet separation net body and a reverse osmosis membrane attached to the reverse osmosis membrane element; the water inlet separation net body is provided with water blocking parts which are arranged at intervals and in a staggered mode in the extending direction of the water inlet separation net body, so that the water inlet separation net forms a water diversion flow channel which is continuously bent; and the distance between every two adjacent water blocking parts is reduced in sequence. The water diversion flow channel is designed to be bent, and the distance between every two adjacent water blocking parts is sequentially reduced, so that the flow speed of raw water is gradually increased, on the basis that the water diversion flow channel is designed to be relatively long, the flow speed of the raw water can be maintained to be gradually increased, the raw water spirally flows in the water diversion flow channel, and the flow area of the raw water is gradually reduced; the shear flow velocity of the concentrated water end is improved, and concentration polarization caused by poor water quality of the concentrated water end is weakened, so that the reverse osmosis membrane can more effectively resist pollution and blockage.

The invention discloses a high-temperature-resistant nanofiltration membrane and a preparation method and application thereof.The preparation method of the high-temperature-resistant nanofiltration membrane comprises the steps that a base membrane is soaked in an aniline oxidation prepolymerization solution and a cross-linking agent solution for a period of time and then taken out, the base membrane is washed with pure water, then the base membrane is placed at the temperature of 80-100 DEG C to be heated for 5-15 min, and the high-temperature-resistant nanofiltration membrane is prepared; the base membrane is one of a polysulfone membrane, a polyimide membrane and a meta-aramid membrane; the base membrane is soaked in the aniline oxidation prepolymerization liquid, taken out, washed with pure water and then soaked in the cross-linking agent solution, or the base membrane is soaked in the cross-linking agent solution, taken out, washed with pure water and then soaked in the aniline oxidation prepolymerization liquid. The aniline can generate a multi-heterocyclic ring conjugated polymer compound under the action of a strong oxidant, and a benzene ring and a nitrogen-containing heterocyclic ring exist in the structure, so that the rigidity of a molecular chain is relatively strong, and the influence of temperature on thermal motion of the molecular chain is relatively small.

The invention relates to the technical field of water resource purification, in particular to a control method and equipment of a reverse osmosis water purification system.The control method comprises the steps that firstly, on the fluctuation dimension of the pre-membrane pressure, the adjusting requirement of the frequency of a high-pressure pump is preliminarily determined on the dimension of the pre-membrane pressure according to an obtained pressure fluctuation index; determining a membrane resistance increase factor representing the pollution state of the reverse osmosis membrane on the basis of the transmembrane pressure difference on the dimension of separation function failure of the reverse osmosis membrane; finally, a membrane separation abnormal value is comprehensively represented by combining a pressure fluctuation index and a membrane resistance increase factor, and a purified water recovery rate is introduced to a membrane separation result end, so that the finally obtained frequency reduction demand degree is more accurate, and the control effect of the reverse osmosis water purification system is improved; therefore, the stable, efficient and sustainable operation of the reverse osmosis water purification system can be ensured while the membrane surface pollutant deposition driving force can be effectively reduced and the membrane pollution speed can be slowed down.

The invention relates to a preparation method of a nanofiltration membrane, the nanofiltration membrane prepared by the preparation method and application of the nanofiltration membrane. The method comprises the following steps: preparing a membrane casting solution, curing the membrane casting solution on a support material to form a base membrane, and the membrane casting solution comprises a polymer and a solvent; the base membrane is in contact with a first phase solution and a second phase solution in sequence, the first phase solution comprises a first phase monomer, an adsorbent A, an active agent B and an acid-binding agent C, and the second phase solution comprises a second phase monomer and a cross-linking agent D; and post-processing. The nanofiltration membrane disclosed by the invention has excellent tolerance to high-concentration strong oxidizing acid or mixed acid, still keeps high flux and high salt rejection rate even after being soaked in the high-concentration strong oxidizing acid or mixed acid for a long time, can stably operate for a long time under high pressure, and has high flux and high salt rejection rate at the same time; the method can be effectively applied to the fields of waste acid treatment in the titanium dioxide production process, extraction and separation of lithium battery raw materials, mineral product smelting metal ion and acid recovery and the like for filtration and / or separation.

The invention discloses an energy-saving and consumption-reducing method for a reverse osmosis membrane system, which belongs to the technical field of water treatment and comprises the following steps: step 1, acquiring various parameter data of the reverse osmosis membrane system in real time; 2, establishing an energy consumption prediction mathematical model of the reverse osmosis membrane system; 3, inputting the real-time parameter data into the energy consumption prediction mathematical model, and judging whether the operation power of the high-pressure pump is reasonable or not according to an output result; 4, when the operation power is not reasonable, the operation power of the high-pressure pump is adjusted in real time; and 5, establishing a membrane pollution concentration early warning model, and carrying out alarm response. According to the method, comprehensive analysis can be carried out in real time according to various parameters of inflow water quality to accurately predict the predicted power, so that whether the set operation power of the high-pressure pump is reasonable or not is judged, the operation power of the high-pressure pump can be dynamically adjusted, the output of energy consumption can be reduced as much as possible under the condition that treatment is qualified, and the operation efficiency of the high-pressure pump is improved. And the cost is saved.

The invention discloses a polyamide composite membrane based on a nanobubble-assisted free interface polymerization strategy and a preparation method and application of the polyamide composite membrane. Nanobubble precursors of different types and concentrations are loaded in a water-phase solution by a chemical method, and the polyamide composite membrane is prepared by means of reaction between the precursors and water or self-decomposition of the precursors. Nanometer bubbles are pre-constructed in a water phase solution, and under a free interface polymerization process, by utilizing upward migration of the nanometer bubbles at a neutralization phase interface of the water phase solution, hierarchical regulation and control of a polyamide separation layer structure are realized from bottom to top; according to the polyamide composite membrane, the bottom opening characteristic, the internal nano-cavity structure and the surface morphological characteristic of the polyamide separation layer are effectively improved, the transmembrane transmission rate of water molecules is remarkably increased, the hydraulic resistance is reduced, and the water flux of the membrane is remarkably improved on the premise that the salt rejection rate of the polyamide composite membrane is not sacrificed.

The invention discloses a preparation method of an acid-resistant polyquaternary ammonium membrane based on a Porxitch interfacial polymerization reaction. The preparation method comprises the following steps: dissolving an amine monomer in a water-phase solvent to form a water-phase solution; dissolving a bromomethyl monomer in an organic phase solvent to form an organic phase solution; after the base membrane is soaked in the water phase solution for a period of time, the water phase solution is removed, and the water phase solution remaining on the surface of the base membrane is removed; coating the organic phase solution on the surface of a base membrane, and carrying out interfacial polymerization reaction for 1-15 minutes at the high temperature of 50-90 DEG C, so as to prepare a polyquaternary ammonium membrane on the base membrane; and washing the surface of the polyquaternary ammonium membrane with an organic solvent to remove residual reactants, and then carrying out heat treatment in a drying oven to obtain the acid-resistant polyquaternary ammonium membrane.

An underdrain filtered water collection system includes: a pair of opposing drainpipes, each drainpipe having a plurality of collection drains; and a diffuser screen. The diffuser screen can slide within an outlet in each of the collection drains. A diffuser screen for a pressure vessel containing filter media includes: a screen pipe; a solid plate coupled to a base of the screen pipe; and a winged diffuser arranged around an outer circumference of the solid plate. The winged diffuser includes a plurality of foldable wings. The screen pipe includes a mesh screen having preconfigured interstices therethrough. Feed water flows through the screen pipe where it is directed by an inner surface of the solid plate to flow in a diffused flow through the interstices of the mesh screen and the wings.

The invention discloses a preparation method of a crown ether functionalized anti-pollution nanofiltration membrane, which comprises the following steps: soaking a membrane of a commercial nanofiltration membrane in pure water, and coating the surface with a double-end epoxy compound ethanol solution; uniformly coating the surface of the membrane with an aza 12-crown-4 methanol solution; and drying the membrane in an atmosphere of 40-90 DEG C to obtain the crown ether functionalized anti-pollution nanofiltration membrane. The nano-filtration membrane is realized by chemically grafting aza 12-crown-4 on the membrane surface of a commercial nano-filtration membrane by utilizing a double-end epoxy compound; compared with a traditional nanofiltration membrane, the crown ether functionalized nanofiltration membrane provided by the invention has the advantages that the electronegativity of the surface is reduced, and the surface is similar to an aquatic plant molecular brush structure, so that the deposition of pollutants on the surface of the membrane can be effectively improved, and the anti-pollution performance of the membrane is enhanced; meanwhile, due to the complexing effect of 12-crown-4 molecules on lithium ions, the lithium ions can be effectively captured, concentration polarization of the lithium ions on the surface of the diaphragm is improved, and then the magnesium-lithium separation efficiency of the diaphragm is improved.

The invention relates to the technical field of membrane separation, and discloses a composite nanofiltration membrane as well as a preparation method and application thereof. The composite nanofiltration membrane comprises an enhancement layer, and a support layer, a middle layer and a separation layer which are sequentially attached to the surface of the enhancement layer, the supporting layer is a polymer layer containing nano manganese dioxide; the middle layer is a tannic acid-iron ion complex layer; and the separation layer is a polyamide layer. The supporting layer of the composite nanofiltration membrane is a polymer layer containing nano-manganese dioxide, the nano-manganese dioxide is uniformly dispersed in the polymer layer and interacts with tannic acid in the middle layer, and gaps between the nano-manganese dioxide and a polymer matrix can provide channels for solvent transmission, reduce solvent passing resistance and improve flux. Meanwhile, the middle layer and the separation layer interact with each other, so that the thickness of the separation layer is relatively thin, and the flux of the composite nanofiltration membrane is further improved.

A filtration membrane includes a thermoplastic substrate, a first layer comprising a polysulfone, a polyvinylpyrrolidone, and a tetramine, and a second layer comprising the tetramine and reacted units of a phthaloyl chloride cross-linked to form a polyamide. A method of preparing the filtration membrane by impregnating tetramine in an ultrafiltration support matrix for rapidly fabricating a hyper-cross-linked polyamide membrane. The membrane prepared by the method of present disclosure can be used for nanofiltration.

Provided are methods of extracting lithium from a lithium containing solution, as well as the resulting compositions. The method includes supplying a lithium containing solution to a lithium capture step, the lithium capture step being operable to capture lithium from the lithium salt containing solution. The method further includes recovering lithium from the lithium capture step to produce a lithium rich stream. In especially preferred methods, the lithium capture step is performed to increase the lithium to sodium ratio above at least 1:1. Optionally, the lithium rich stream can be purified to remove divalent ions and borate ions. The lithium rich stream is then concentrated by supplying the lithium rich stream to a reverse osmosis step to produce a concentrated lithium rich stream.

The invention relates to the technical field of reverse osmosis membranes, in particular to a polyamide reverse osmosis membrane for high-salinity wastewater treatment and a preparation method of the polyamide reverse osmosis membrane. The invention solves the problem that the polyamide reverse osmosis membrane cannot give consideration to both desalination rate and water flux. The polyamide reverse osmosis membrane comprises a polyester non-woven fabric layer, a polysulfone porous layer, a transition layer and a polyamide layer. The polysulfone porous layer is prepared, and the modified pore-forming agent is added to improve the water flux of the reverse osmosis membrane; the hydrophilicity of the reverse osmosis membrane is improved by preparing the transition layer and adding a hydrophilic auxiliary agent when the polyamide layer is prepared; the flux attenuation rate of the polyamide reverse osmosis membrane is reduced by preparing the polyamide layer; the desalination rate of the reverse osmosis membrane is improved by introducing a composite ion complexing agent and graphene quantum dots into the polyamide layer.

Described herein are methods of recovering lithium from dilute lithium sources. The methods include extracting lithium from an extraction feed using direct lithium extraction in an extraction stage to yield a lithium intermediate, performing one or more concentration operations, each concentration operation concentrating an input stream to yield an output feed, wherein the input stream is obtained from the lithium intermediate and / or the extraction feed is obtained from the output feed. At least one of the concentration operations includes a membrane separation operation having a plurality of reactors in series each having a semi-permeable membrane, such as a counter-flow reverse osmosis operation. Methods may also include generating a low TDS stream as a permeate from any of the one or more concentration operations, wherein the low TDS stream is recycled or used as fresh water.

The invention relates to a preparation method of a nanofiltration membrane, the nanofiltration membrane prepared by the preparation method and application of the nanofiltration membrane. The method comprises: treating a base membrane having a polyamide layer thereon to convert acyl chloride groups in the polyamide layer into carboxyl groups, the base membrane comprising a reinforcing material layer and a polymer layer; activating the carboxyl group, wherein the activating treatment is carried out by using a solution containing a carboxyl group activating agent; contacting with a solution containing amino polyethylene glycol substances; contacting with a solution comprising a cross-linking agent; contacting with a solution comprising at least one of a polyhydroxy polymer and a polyhydroxy compound. The method is simple and easy to operate, reaction parameters are easy to regulate and control, and continuous industrial production can be achieved. The nanofiltration membrane prepared by the invention has stable and excellent comprehensive performance (permeability, separation performance, pollution resistance, scratch resistance and thick net bruise resistance). The nanofiltration membranes of the invention can be advantageously used for filtration, separation, and / or concentration.

The utility model provides a circulating type wastewater treatment device and a household water purifier, the circulating type wastewater treatment device comprises a wastewater pipeline, one end of the wastewater pipeline is suitable for being connected with a wastewater port of the water purifier, and a one-way valve is arranged on the wastewater pipeline; the water mixing tank comprises a tank body, and the tank body is provided with a first water inlet connected with the other end of the wastewater pipeline and used for receiving wastewater flowing out of the wastewater pipeline; the second water inlet is communicated with a tap water pipeline and is used for introducing tap water so as to primarily dilute the wastewater in the box body and form mixed water; the first water outlet is communicated with a water inlet of the water purifier; and a second water outlet; the faucet is communicated with the second water outlet, and the faucet is configured to reduce the TDS value of the mixed water by discharging at least part of the mixed water; wherein the mixed water is continuously diluted by tap water in the tap water pipeline within the interval time of water production.

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination reverse osmosis membrane, a preparation method and application. The seawater desalination reverse osmosis membrane is prepared by the preparation method. The preparation method comprises the following steps: immersing the prepared support layer into a water phase solution, and then taking out the support layer adsorbing the water phase solution; immersing the support layer adsorbing the water phase solution into a first oil phase solution, and forming a primary reverse osmosis membrane through a first interfacial polymerization reaction; then, taking out the primary reverse osmosis membrane, and carrying out first drying treatment under a steam condition; and immersing the primary reverse osmosis membrane into a second oil phase solution, and carrying out a second interfacial polymerization reaction to form the seawater desalination reverse osmosis membrane. The application refers to the application of the reverse osmosis membrane for seawater desalination in the aspects of reclaimed water reuse, seawater desalination and brackish water desalination. According to the invention, the seawater desalination reverse osmosis membrane which simultaneously meets high desalination rate and high water flux can be prepared.

Described herein are membrane assemblies for use in generating hydrogen and oxygen. The membrane assemblies include a cation exchange membrane, an anion exchange membrane, and a hydrophilic layer disposed between the anion exchange membrane and the cation exchange membrane.

The invention relates to a marine reverse osmosis seawater desalination equipment system which comprises a raw water pretreatment module, a primary reverse osmosis module, a secondary reverse osmosis module and an energy recovery module, raw water is preliminarily filtered by the raw water pretreatment module, then pressurized by the first-stage high-pressure pump and injected into the first-stage reverse osmosis module to generate first-stage high-pressure concentrated water, and the first-stage high-pressure concentrated water pressurizes low-pressure raw water treated by the raw water pretreatment module through the energy recovery module, then pressurized by the pressure lifting pump and injected into the first-stage reverse osmosis module; the first-stage high-pressure concentrated water is pressurized by a second-stage high-pressure pump and injected into a second-stage reverse osmosis module to generate second-stage high-pressure concentrated water, and the second-stage high-pressure concentrated water is recycled; according to the equipment system, the TDS of produced water is detected, and the pressure of the primary reverse osmosis module and the pressure of the secondary reverse osmosis module are controlled, so that the equipment system realizes maximization of produced water, efficient integration of the system, complete functions, high water production efficiency, full-automatic control and wide application scene under the condition that the equipment system meets the quality requirement of the produced water.

The invention relates to the technical field of ammonia water preparation, in particular to a raw water reverse osmosis treatment device for ammonia water preparation, which comprises a shell, the shell is formed by fixing an upper shell and a lower shell, a water inlet pipe is fixed in the middle of the top of the shell, a high-pressure water inlet component is arranged at the top of the water inlet pipe, and a concentrated water outlet pipe is fixed in the middle of the bottom of the shell. A drain valve is fixedly mounted at the bottom of the concentrated water outlet pipe; and the water pressure stabilizing assembly is arranged at the top of the inner wall of the shell. A multi-level pressure regulation and control mechanism is constructed in the reverse osmosis process, the problem of instantaneous pressure impact when the high-pressure pump is started is solved, physical damage to the membrane is avoided, a dual anti-blocking system of active rotary cleaning and back flushing is constructed, the membrane blocking probability is greatly reduced, meanwhile, the impact force of water flow is fully weakened in the back flushing stage, and the reverse osmosis efficiency is improved. It is ensured that the reverse osmosis membrane bears stable pressure all the time, and the problem of secondary damage to the reverse osmosis membrane caused by too large instantaneous pressure in the backwashing stage is avoided.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.

The present invention relates of a biodegradable and hydrophobic polylactic acid (PLA) non-woven material and a process for manufacturing thereof, said PLA non-woven material comprising a non-woven fabric for personal protective equipment, and a non-woven fabric for the three layer surgical mask; said PLA non-woven material comprising a layer of nanofiber membrane and a layer of biodegradable spunbond fabric which could fulfil the international biodegradation standard EN13432. Said non-woven fabric for the PPE has at least 45N breaking force, at least 15% elongation, and having passed level 3 fluid resistance test according to AATCC 42 and AATCC 127.

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention relates to the technical field of reverse osmosis membrane supports, in particular to a polyester non-woven fabric and a preparation method and application thereof.The preparation method comprises the steps that S1, polyester main body fibers and polyester adhesive fibers are used as raw materials to prepare high-quantitation original cloth M0 and low-quantitation original cloth H0; carrying out hot pressing pretreatment on the H0 to obtain a product H0 '; s2, overlapping and hot-pressing M0 and H0 'to obtain a composite non-woven fabric M1H1; s3, the M1H1 is impregnated with a functional solution, and the functional solution contains para-aramid nanofibers and nano calcium carbonate modified by hexadecyl trimethyl ammonium bromide; and then carrying out cold pressing on the composite non-woven fabric impregnated with the functional solution to obtain the nano-material modified composite non-woven fabric. And S4, carrying out secondary hot pressing treatment to obtain the polyester non-woven fabric. The polyester non-woven fabric can effectively avoid the problems of excessive curling, excessive permeation of a polysulfone solution and the like during curing after being coated with polysulfone, and is more beneficial to application in a reverse osmosis membrane.

The invention relates to the technical field of reverse osmosis membrane assembly cleaning, and particularly discloses a cleaning method of a reverse osmosis membrane. The cleaning method of the reverse osmosis membrane comprises the following steps: (1) washing the reverse osmosis membrane with product water of a reverse osmosis membrane system until concentrated water in the membrane is fully replaced with the product water; (2) immersing the cleaned reverse osmosis membrane into an acidic cleaning solution, and controlling the pH value to be 2-2.5; (3) washing the reverse osmosis membrane with product water of a reverse osmosis membrane system until concentrated water in the membrane is fully replaced with the product water; (4) immersing the cleaned reverse osmosis membrane into an alkaline cleaning solution, and controlling the pH value to be 11.5-12; and (5) repeating the steps (1)-(4), and flushing the reverse osmosis membrane with the product water of the reverse osmosis membrane system until the concentrated water in the membrane is fully replaced with the product water. The prepared reverse osmosis membrane has good cleaning efficiency, the permeation flux and the desalination rate of the reverse osmosis membrane are recovered, and the service life of the reverse osmosis membrane is prolonged.

The present invention relates to the technical field of reverse osmosis membrane detection devices. Disclosed is a detection device capable of efficiently mounting and dismounting a reverse osmosis membrane. The detection device comprises a fixing unit and a detection unit, wherein the fixing unit comprises a first fixing base, a second fixing base arranged on one side of the first fixing base, and positioning assemblies arranged on the first fixing base and the second fixing base; and the detection unit comprises a freshwater discharge pipe arranged on one side of the first fixing base, a concentrated-water discharge pipe arranged at the bottom end of the first fixing base, a water intake pipe arranged on one side of the second fixing base, and movable connecting assemblies arranged on the first fixing base and the second fixing base, wherein the movable connecting assemblies are configured to connect to two ends of a reverse osmosis membrane. In the present invention, a reverse osmosis membrane to be detected can be rapidly fixed to the fixing unit, and the detection unit is quickly connected in a sealed manner to the two ends of the reverse osmosis membrane, so as to implement effective detection and realize high detection efficiency; and the detection device involves convenient mounting and dismounting and is easy to use.

According to the method for preparing the polyamide / sulfonated COFs reverse osmosis membrane through in-situ copolymerization, a polysulfone ultrafiltration membrane is used as a supporting layer, a water-phase monomer solution and an organic-phase monomer solution are subjected to a one-step in-situ copolymerization reaction on a water-phase / organic interface on the supporting layer, and the polyamide / sulfonated COFs reverse osmosis membrane is prepared. The preparation method is simple in technological process and low in cost, the sulfonated COFs material is introduced into a polyamide layer through one-step interface in-situ copolymerization, the dispersity and compatibility of the sulfonated COFs can be well enhanced, the interface polymerization process is regulated and controlled by fully utilizing a porous structure, hydrophilicity and indirect control of monomer diffusion, and the like, and the preparation method is suitable for large-scale industrial production. The trade-off effect of a traditional polyamide reverse osmosis membrane is broken through, the salt rejection rate is increased while high water flux is guaranteed, and the polyamide reverse osmosis membrane has very high practical application value.

The present invention discloses a high-performance reverse osmosis membrane and a method for preparing the same. The reverse osmosis membrane comprises a polyester non-woven fabric layer, a polysulfone-based membrane, and a polyamide skin layer stacked in sequence. The polysulfone-based membrane has a micron-scale prism structure on the side away from the polyester non-woven fabric layer. The preparation method comprises coating the surface of the polyester non-woven fabric layer with the polysulfone-based membrane, and forming the micron-scale prism structure on the surface of the polysulfone-based membrane by cold pressing with a roller mold during the process of converting the polysulfone-based membrane from a liquid state to a solid state. The present invention improves the flux without affecting the desalination rate of the reverse osmosis membrane or sacrificing the thickness of the skin layer, thereby resolving the trade-off between flux and desalination in the current technology. At the same time, the micron-scale prism structure can be designed into different shapes according to performance requirements, thereby achieving precise control of the flux performance of the reverse osmosis membrane.