154results about How to "Improve interception effect" patented technology

The invention provides a layer-by-layer self-assembled nanofiltration membrane and a preparation method and application thereof.The layer-by-layer self-assembled nanofiltration membrane comprises a base membrane and a self-assembled coating formed on the base membrane, and the self-assembled coating at least comprises an initial alternating coating and a separation alternating coating; the molecular weight cutoff of the base membrane is not less than 500kDa; the initial alternate coating is formed by alternately assembling a large-molecular-weight cationic polyelectrolyte layer and an anionic polyelectrolyte layer, and the separation alternate coating is formed by alternately assembling a small-molecular-weight cationic polyelectrolyte layer and an anionic polyelectrolyte layer; the initial alternating coating is formed on the base membrane, and a high-molecular-weight cationic polyelectrolyte layer in the initial alternating coating adopts cationic polyelectrolyte with the number-average molecular weight not less than 500kDa; and the small-molecular-weight cationic polyelectrolyte layer in the separation alternate coating is cationic polyelectrolyte with the number-average molecular weight not exceeding 100kDa. The layer-by-layer self-assembled nanofiltration membrane provided by the invention has more excellent permeability and micropollutant rejection rate.

The invention relates to the technical field of plastic mold drilling, in particular to plastic mold numerical control precision drilling equipment and a using method thereof.The plastic mold numerical control precision drilling equipment comprises a base, a fixed table is movably installed at the top of the base, a rack is fixedly connected to the top of the base, a movable table is installed on the rack, and a pushing plate is slidably connected to the bottom of the movable table; a collecting assembly and a drilling assembly are arranged on the pushing plate; according to the device, firstly, the area around a drilling point can be comprehensively shielded through the collecting assembly, the same contact surface can be autonomously formed according to the uneven surface of the plastic mold, and the waste intercepting effect is further enhanced; and the drilling assembly is matched, during drilling, instant smashing of filiform plastic waste is achieved, efficient collection and treatment of the waste are achieved, air is blown into the material blocking and collecting barrel, on one hand, negative-pressure material suction is assisted, the waste collecting effect is improved, and on the other hand, synchronous cleaning treatment is achieved when the drill bit rotates and ascends.

The invention provides a wafer defect detection method and device, and belongs to the technical field of semiconductor manufacturing. The wafer defect detection method comprises the steps that defect data of the surface of each wafer are acquired, and the defect data comprise defect position coordinates, defect sizes and defect types; superposing the defect data of the plurality of wafers to generate a comprehensive defect distribution diagram of the plurality of wafers; analyzing the comprehensive defect distribution diagram by utilizing a spatial clustering algorithm, and judging whether the comprehensive defect distribution diagram has a COP defect distribution mode or not; if the COP defect distribution pattern exists in the comprehensive defect distribution diagram, calculating risk scores of the plurality of wafers according to the defect distribution density, the defect size and the defect distribution rule by utilizing a defect identification model; and comparing the risk scores of the plurality of wafers with a preset risk threshold, and if the risk scores are greater than the preset risk threshold, determining that the plurality of wafers have COP defects. According to the invention, the COP defect of the wafer can be identified.

The invention relates to a reply control method and device of a large language model, electronic equipment, a storage medium and a program product. The method comprises the steps of obtaining a to-be-replied question; in response to the situation that the to-be-replied question meets a preset sensitive condition, obtaining target safety prompt information corresponding to the to-be-replied question; wherein the preset sensitive condition comprises that the question to be replied belongs to a sensitive question; and inputting the to-be-replied question and the target safety prompt information into a preset large language model, and outputting first reply information corresponding to the to-be-replied question through the large language model.

The invention discloses a chlorine-resistant polyamide composite nanofiltration membrane and a preparation method thereof. The composite nanofiltration membrane is composed of a polysulfone-based membrane, and a catechol intermediate layer and a polyamide desalination layer which are sequentially arranged on the polysulfone-based membrane, wherein the catechol middle layer comprises a plurality of catechol self-polymerization layers, and catechol is subjected to oxidation self-polymerization and then is constructed on the polysulfone base membrane layer by layer to obtain the catechol self-polymerization layers; and the polyamide desalination layer is constructed on the catechol intermediate layer through an interfacial polymerization reaction. The chlorine-resistant polyamide composite nanofiltration membrane comprises a polysulfone base membrane, a catechol middle layer and a polyamide desalination layer, the catechol self-polymerization middle layer is formed through a layer-by-layer construction technology, certain chlorine resistance is provided, meanwhile, the possibility that the middle layer falls off is reduced, and the stability of the composite nanofiltration membrane is enhanced; the tannic acid is added into a water-phase solution, so that the performance of the polyamide composite nanofiltration membrane is adjusted, and the polyamide composite nanofiltration membrane is endowed with relatively high chlorine resistance.

The invention relates to the technical field of precious metal recovery, in particular to a precious metal recovery method. Comprising the following steps: filtering wastewater containing precious metals by using a precious metal recovery composite membrane, and drying the precious metal recovery composite membrane after filtering; then filtering an acidic aqueous solution by using the dried precious metal recovery composite membrane, and then continuously filtering and cleaning by using clear water; the cleaned precious metal recovery composite membrane is put into an N, N-dimethylformamide soaking solution, then ultrasonic oscillation treatment is conducted, the composite membrane is taken out of the soaking solution, then centrifugal treatment is conducted on the soaking solution, precipitates are collected, and the precious metal particles are obtained. The precious metal is recovered by adopting a membrane filtration method, and compared with an impregnation method, a large amount of membrane cost is saved, so that the precious metal recovery cost is reduced, and the method is suitable for industrial metal recovery.

The invention discloses an environment-friendly construction dust suppression device and method, and relates to the technical field of environment-friendly construction. According to the environment-friendly construction dust suppression device, through the design of a composite mechanism, a suction fan is inserted into the outer side of an external connection disc, so that disassembly and assembly are facilitated, follow-up replacement and maintenance are facilitated, the suction fan is started, wind enters from the side, close to a flowing pipe, of the inner wall of a composite shell and flows towards the side of the suction fan, and therefore dust and smell on a site are absorbed; the situation that the site environment is too severe, personnel safety is affected, potential safety hazards are reduced, the flowing pipe is of a structure with the two wide ends and the middle narrow and small, according to the Bernoulli principle, the diameter of the pipeline is reduced, the flowing speed of gas is increased, and therefore the operation effect is improved, and the cleaning efficiency of the construction site is improved; dust and air flow enter the composite shell, harmful gas of the air flow is filtered and purified through the filtering mechanism, and therefore normal operation of equipment is kept.

The invention relates to the technical field of circuit board processing, in particular to a cleaning and drying integrated device for circuit board processing, a frame body drives a circuit board to rotate in a reciprocating mode, cleaning liquid collected on the circuit board is poured out, then drying operation is carried out, the drying efficiency is improved, and meanwhile the drying efficiency is improved. The frame body is used for pouring cleaning liquid collected on the upper side surface of the circuit board, and is also used for being matched with the air bag to form an air curtain at the left opening of the frame body, so that hot air in the drying machine can be prevented from penetrating through the frame body and flowing into the cleaning machine, and the heat loss in the drying machine can be greatly reduced; a cleaning and drying integrated device for circuit board processing comprises a frame body, a first partition plate, a second partition plate, an air bag, a first pipeline, a first one-way valve, a second pipeline, a second one-way valve and a driving assembly. The box body is connected with a driving assembly; the driving assembly is connected with a frame body; one side of the box body is fixedly connected with a partition plate I, and the other side of the box body is fixedly connected with a partition plate II; the first partition plate and the second partition plate make contact with the frame body.

The invention relates to the technical field of communication, and discloses a short message interception processing method, a short message interception processing system and a server, and the method comprises the steps: obtaining first short message data, inputting the first short message data into a classification model to generate an interception strategy, judging whether a real-time short message is a junk short message or not based on the interception strategy, and if the real-time short message is the junk short message, sending the junk short message to the server; if the short messages are not spam short messages, the real-time short messages are added to the blacklist, and if the short messages are not spam short messages, the real-time short messages are pushed to the user, the corresponding interception strategy can be generated for the user based on the historical short message data of the user, so that the spam short message interception effect is improved, and the satisfaction degree of the user to short message communication is improved.

The invention provides a refrigeration system drying filter, and relates to the technical field of refrigeration systems. The drying filter of the refrigerating system comprises a shell, a filter element, a water inlet end filter screen and a water outlet end filter screen and further comprises a turbulent flow mechanism, the turbulent flow mechanism comprises an axis assembly, a front-end turbulent flow assembly, a screen drum, a positioning piece and a rear-end turbulent flow assembly, the front-end turbulent flow assembly generates kinetic energy of rotation through flowing of a refrigerant, and the rear-end turbulent flow assembly generates kinetic energy of rotation through the screen drum. The rear-end turbulent flow assembly converts a refrigerant from axial flow into radial flow, and the front-end turbulent flow assembly enables a flow channel of refrigerant fluid to radiate in the circumferential direction, so that the refrigerant enters the filter element from the side wall direction of the filter element, the use efficiency of the filter element is improved, the intensification of the local blockage condition of the filter element is reduced, and the service life of the filter element is prolonged. The rear-end turbulent flow assembly continues to change the flow channel of the refrigerant discharged from the filter element, so that the refrigerant flowing to the water outlet end filter screen is uniformly distributed on the water outlet end filter screen as much as possible, and serious local blockage of the water outlet end filter screen is avoided.

The invention belongs to the technical field of membrane separation, and particularly relates to a hydrogen bond organic framework material composite membrane and a preparation method and application thereof, and the preparation method of the hydrogen bond organic framework material composite membrane comprises the following steps: dissolving a hydrogen bond organic framework material in a first solvent to obtain a hydrogen bond organic framework material solution; dissolving graphene oxide in a second solvent to obtain a graphene oxide solution; mixing the hydrogen bond organic framework material solution and the graphene oxide solution to a constant volume, and then carrying out ultrasonic treatment to obtain a uniformly mixed GO / HOF compound solution; the GO / HOF compound solution is subjected to suction filtration to the surface of the substrate film through a vacuum suction filtration method, and the composite film with a uniform structure is formed by using hydrogen bonds between the hydrogen bond organic framework and graphene oxide and a pi-pi conjugation effect. The preparation method provided by the invention is simple to operate and mild in preparation condition, and the prepared hydrogen bond organic framework material composite membrane is relatively large in flux and has better interception performance.

The invention relates to the technical field of cement clinker production, and discloses a batching device and method.The batching device for cement clinker production comprises a mixing box, a stacking hopper, a screening plate and a stirring rod are sequentially installed in the mixing box from top to bottom, and a scraping and crushing mechanism is arranged on the upper side of the screening plate; the scraping and crushing mechanism is in transmission connection with the stirring rod, the screening plate comprises an annular groove, a conical plate is fixedly mounted on the annular groove, a plurality of annular holes are formed in the conical plate, and the scraping and crushing mechanism comprises a scraping assembly and a crushing assembly. Fine materials are screened out through the annular holes, caked or large-particle stones are intercepted, the pushing blocks drive the caked or large-particle stones to slide onto the annular grooves, the caked or large-particle stones are crushed into fine materials through the crushing rollers, and then the fine materials are pushed to the bottom of the material mixing box through the material pushing plate. And blocked agglomerated or large-particle stones are crushed and fall back into the mixing box while the conical plate is prevented from being blocked.

The present invention relates to the technical field of hollow fiber membranes, and to a PVDF hollow fiber membrane and a preparation method and use thereof. In the present invention, a nascent hollow fiber membrane having a hydrophilic photoinitiator molecular chain is subjected to ultraviolet irradiation to cause a cross-linking reaction to form a semi-interpenetrating structure, and a hydroxyl hydrophilic group is generated at the same time, so that the hydrophilicity and mechanical properties of the membrane are improved, the reaction degree is easy to control, and continuous operation can be achieved.

The invention discloses a preparation method and application of a catalytic membrane based on monatomic iron-manganese oxide, and belongs to the field of catalytic membrane water treatment. The invention aims to solve the problems that a chromium fog inhibitor F-53B in the existing chromium plating wastewater is difficult to degrade, and the degradation rate is greatly reduced when residual PAM and F-53B coexist. The method comprises the following steps: 1, preparing a casting solution; 2, dripping the membrane casting solution into pores of a hollow ceramic membrane substrate and drying; 3, preparing a potassium ferricyanide aqueous phase solution; 4, preparing a manganese acetylacetonate oil phase solution; and 5, dipping the dispensed ceramic membrane substrate in a potassium ferricyanide water-phase solution, dropwise adding a manganese acetylacetonate oil-phase solution into pores of the ceramic membrane substrate subjected to water-phase treatment, and finally calcining. The application comprises the following steps: degrading chlorinated polyfluoroalkyl ether sulfonate; or in the presence of polyacrylamide, the catalyst is used for degrading the chlorinated polyfluoroalkyl ether sulfonate. The preparation method is used for preparation and application of the catalytic membrane based on the monatomic iron-manganese oxide.

The invention discloses a soil covering and grass planting protection structure suitable for a rock cutting slope. The soil covering and grass planting protection structure comprises a flow guide mechanism, a reinforcing mechanism and a greening mechanism. The flow guide mechanism comprises drainage side ditches, transverse flow guide ditches, longitudinal flow guide ditches, J-shaped flow guide grooves and U-shaped flow guide grooves; the drainage side ditch is arranged at the slope toe of the side slope; the transverse diversion trenches are transversely arranged along the slope and are W-shaped; a plurality of longitudinal diversion trenches are vertically arranged along the side slope, and the longitudinal diversion trenches are connected with the lowest positions of wave troughs of the W-shaped transverse diversion trenches, so that the side slope is partitioned and layered; the J-shaped flow guide grooves are embedded into the transverse flow guide ditches; the U-shaped flow guide grooves are embedded into the longitudinal flow guide ditches; the lower end of the U-shaped diversion trench is connected with the drainage side ditch; the reinforcing mechanism comprises a fixing piece and a reinforcing mesh; the greening mechanism comprises an overburden layer and a grass planting layer. The invention further discloses a construction method suitable for the soil covering and grass planting protection structure for the rock cutting slope. The stability and the greening effect of the silty rock cutting high slope greening structure can be ensured.

The utility model relates to the technical field of valves, in particular to a stop valve with a standby valve seat, which comprises a valve casing, an upper valve seat is mounted close to the upper portion in the valve casing, a lower valve seat capable of moving up and down is arranged below the upper valve seat, an upper valve core is arranged above the upper valve seat in the valve casing, and a lower valve core is arranged above the lower valve seat. The upper valve element and the lower valve element are connected through a connecting rod, and a second threaded rod is rotationally connected to the center of the top of the upper valve element. By arranging the lower valve seat capable of moving up and down, when the upper valve seat breaks down, the lower valve seat extends to the highest position, the valve can be sealed through cooperation between the lower valve seat and the lower valve element, double guarantees are provided for the valve, the two valve seats can be used at the same time, and the closure effect of the valve can be effectively improved.

The invention provides a many-to-many saturation interception target allocation optimization method and system based on threat sorting. In order to solve the problem of target distribution in multi-target multi-interception saturation interception, threat attribute values such as attack object value, residual distance, flight speed and type value of an air attack target are introduced, and a comprehensive threat quantitative evaluation sorting method is provided through normalization and weight coefficient processing. Meanwhile, an interception success probability rapid calculation model based on the zero-control miss distance and the relative position and a first-time and second-time target distribution optimization algorithm based on threat sorting and a success rate matrix are constructed. The method has the advantages of being few in parameter, easy to obtain, small in calculation amount, capable of achieving real-time dynamic processing, wide in application range and the like, and the comprehensive efficiency of large-scale saturated multi-target multi-interceptor collaborative interception combat is remarkably improved.

The invention discloses a simple preparation method of a high-performance film composite forward osmosis membrane, and belongs to the technical field of water treatment. The preparation method comprises the following steps: firstly, selecting a basement membrane with an ultra-large aperture as a supporting layer of the TFC to relieve a concentration polarization phenomenon and provide a larger interface specific surface area for the growth of polyamide; then, a surfactant is introduced into the water-phase solution to further promote the improvement of the effective water delivery area of the membrane. And finally, carrying out interfacial polymerization reaction on the surface of the substrate membrane to synthesize the TFC-FO membrane with higher performance. The TFC-FO membrane prepared through the method has excellent water flux and interception performance, the FO performance of the TFC-FO membrane is continuously improved along with increase of the pore diameter of the supporting layer, and the application potential of the TFC-FO membrane in the technical field of water treatment is greatly improved.

The invention provides a solid rocket engine grain embedded with metal wires and application of the solid rocket engine grain. The solid rocket engine grain embedded with the metal wires is a grain body with a cylindrical structure; wherein the grain body contains a burning speed reducing agent, and a metal wire is further embedded between the grain bodies. The grain is divided into layers with different combustion speeds by adding different metal wires and the combustion speed reducing agent, the purposes of setting the combustion speed and thrust of each layer and adjusting the interval time are achieved, and the range, maneuverability, interception capability and combat capability of a missile can be improved by managing the energy of the propellant.

The invention discloses an ecological rural ditch nitrogen and phosphorus interception system and method, belongs to the technical field of agricultural non-point source pollution control and water environment treatment, and provides an innovative'buffer-purification-interception 'composite ecological rural ditch nitrogen and phosphorus interception technology. By optimizing the ditch design and the ecological structure, the ecological function of the ditch is enhanced, and pollutants such as nitrogen and phosphorus in farmland drainage are efficiently intercepted and purified by removing nitrogen and phosphorus in a multi-level manner.

The utility model is suitable for the technical field of cut-off devices, and provides a cut-off device for water supply and drainage. The cut-off assembly comprises a baffle ring arranged in the pipeline, a middle plate is arranged on the baffle ring, cut-off plates are rotatably arranged on the two sides of the middle plate, a first rotating shaft is rotatably arranged on one side of the middle plate, the first rotating shaft is rotatably sleeved with a first sleeve shaft, two first sliding blocks are arranged on the first sleeve shaft, and push plates are arranged on the two sides of the first sleeve shaft; a second rotating shaft is rotationally arranged on one side of the first rotating shaft, a rope shaft wound with a plurality of connecting ropes is rotationally arranged in the middle of the second rotating shaft, the connecting ropes are connected with the two intercepting plates, the second rotating shaft is rotationally sleeved with a second sleeve shaft, the second sleeve shaft is provided with a second sliding block, and the second sliding block is provided with a fixing disc; end plates are arranged at the two ends of the rope shaft, and bolts are arranged on the end plates. Therefore, according to the utility model, not only can the intercepting function be realized, but also the flow adjusting function can be realized, and the intercepting plate can be fixed.

The invention discloses a bio-based polyamide nanofiltration membrane and application thereof, and belongs to the technical field of synthesis of bio-based polyamide nanofiltration membranes and purification of 5-hydroxymethylfurfural and 2, 5-furandicarboxylic acid. According to the invention, 2, 5-dimethyl furandicarboxylate and hexamethylenediamine are used as raw materials, polydimethyl furandicarboxylate hexamethylenediamine prepared by an amine ester exchange method is used as a film-forming polymer, and a solution phase inversion method is further adopted to prepare the bio-based polyamide nanofiltration membrane polydimethyl furandicarboxylate hexamethylenediamine membrane. The method has the advantages that 5-hydroxymethylfurfural and soluble humin can be selectively separated by the aid of the method, impurities in 2, 5-furandicarboxylic acid sodium salt aqueous solution can be separated, and accordingly the high-purity 5-hydroxymethylfurfural and 2, 5-furandicarboxylic acid can be prepared.

The utility model discloses a device capable of improving MBBR (moving bed biofilm reactor) filler interception and efficient water passing, which is characterized by comprising a water tank, a pool overflow weir is arranged at the top end of the pool; the mounting bracket is fixedly arranged at the top end of the water tank; the stirring motor is fixedly arranged at the top end of the mounting bracket; the output end of the stirring motor extends out of the bottom end of the mounting bracket and locks a stirring rod through a coupling; the water passing interception folded plate is fixedly arranged at the top end of the pool overflow weir; the water-passing interception net barrel is fixedly arranged on the outer wall of the stirring rod and the top of the water-passing interception folded plate. The outer side of each mesh of the water-passing interception mesh cylinder is provided with the protruding insertion opening, and the insertion opening covers half of the mesh, so that solid particles are effectively intercepted without blocking the mesh, the pollutant interception capability of the filler is improved, and the sewage treatment quality is improved.

The invention relates to a PVDF (Polyvinylidene Fluoride) polymer lateral chromatography membrane and a preparation method thereof, and according to the method, a large-aperture PVDF membrane is prepared by blending a hydrophilic additive with high molecular weight and PVDF powder. The method comprises the following steps: mixing PVDF powder with a hydrophilic pore-foaming agent (such as PVP, PEG and the like) by adopting a solution blending method, performing non-solvent induced phase separation (NIPS) to form a membrane, immersing the membrane into a coagulating bath for a period of time, transferring the membrane into deionized water for soaking, taking out the membrane after the solvent is completely removed, and drying the membrane at normal temperature to form the membrane. And immersing the membrane in a surfactant solution for a period of time, taking out the membrane, and naturally airing the membrane so as to obtain the PVDF flat membrane which has a macroporous structure, a good pore structure, hydrophilicity and protein adsorption performance.

The invention discloses a reverse osmosis membrane assembly which comprises a reverse osmosis core and sealing covers mounted at two ends of the reverse osmosis core in a sealing manner, the reverse osmosis core comprises a middle inner membrane supporting layer as well as two groups of micro-filtration membranes and two groups of ultra-filtration membranes which wrap the outer side of the inner membrane supporting layer, a laminated pre-filtration layer is arranged between the micro-filtration membranes and the ultra-filtration membranes wrapping the inner membrane supporting layer, a PA reverse osmosis membrane wraps the rear parts of the micro-filtration membranes and the ultra-filtration membranes, and a separation net is arranged behind the PA reverse osmosis membrane; due to the synergistic effect of the multiple layers of membranes, the system can treat a more complex and worse seawater environment, and the stability and reliability of the effluent quality are ensured; due to the design of the laminated pre-filtering layer and the separation net, pollutants are effectively prevented from being in direct contact with the membrane holes and blocking the membrane holes, and the stability of the membrane assembly is further enhanced. Due to the introduction of the automatic backwashing device, the automatic backwashing device can be automatically started at regular intervals or according to a water quality monitoring result, the pre-filter is subjected to backwashing, the service life of the pre-filter is prolonged, and the maintenance cost is reduced.

The invention relates to a method for synchronously preparing a special-shaped inorganic nanofiber membrane. The method comprises the following steps: firstly, dissolving a polymer spinning aid, an acid chloride precursor and a silicon oxide precursor in a volatile solvent, spinning the mixed solution into a membrane by adopting an electrostatic spinning technology, and carrying out high-temperature calcination on a hybrid nanofiber membrane containing the polymer spinning aid, the acid chloride precursor and the silicon oxide precursor, the special-shaped inorganic nanofiber membrane is obtained. Compared with a nanofiber membrane material prepared by an existing process technology, the special-shaped nanofiber membrane disclosed by the invention shows good gas purification performance, is high in particulate matter separation efficiency and low in filtering resistance, and provides a reference thought for related fields such as high-efficiency and low-energy-consumption air purification membrane materials and the like.

The present invention relates to the technical field of novel separation membrane materials, and specifically discloses an antibacterial separation membrane uniformly loaded with metal nanoparticles and a preparation method thereof, wherein the preparation method comprises the following steps: S1, preparing a separation membrane one with uniform pore size; S2, preparing a metal salt solution; S3, immersing the prepared separation membrane one in the prepared metal salt solution to obtain a separation membrane two that adsorbs the metal salt solution; S4, preparing a reducing solution; S5, immersing the prepared separation membrane two in the prepared reducing solution to obtain a separation membrane three loaded with metal nanoparticles. The present invention adopts an antibacterial separation membrane uniformly loaded with metal nanoparticles and a preparation method thereof, and fixes a metal nanoparticle antibacterial agent in a separation membrane with uniform pore distribution. The prepared antibacterial membrane can significantly improve the contact between the antibacterial agent and bacteria and improve the sterilization performance on the one hand, and can also improve the uniformity and stability of the antibacterial agent loading on the other hand.

The garden water-saving road comprises a roadbed and drainage pipelines arranged on the two sides of the roadbed, sewage intercepting structures are arranged on the drainage pipelines, a collecting channel is arranged on one side in each drainage pipeline, and each sewage intercepting structure comprises a sewage intercepting net between the corresponding drainage pipeline and the corresponding collecting pipeline and a drainage cover plate arranged on the corresponding drainage pipeline. Filtering holes are formed in the sewage intercepting net at intervals, and the aperture of the filtering holes, close to the drainage pipeline, below the sewage intercepting net is smaller than that of the filtering holes above the sewage intercepting net; water taking holes are formed in the collecting channel at intervals. Water entering the collecting channel is filtered in a classified mode through the sewage intercepting net with different hole diameters, silt and the like deposited at the bottom of the drainage channel are further intercepted through the filtering holes with the small hole diameters, the impurity removal effect on the water flowing into the drainage channel is improved, the water quality is improved so that the water can be recycled for garden irrigation and the like, and water saving is facilitated; when the abutting plate rotates to be staggered with the drainage cover plate, the drainage cover plate can be conveniently opened to clean silt and the like deposited in the drainage channel, and operation is more convenient.

The application discloses a regenerated cationic cellulose-based composite filter membrane and a preparation method and nanometer plastic removal application thereof, and belongs to the technical field of regenerated cellulose water treatment filter materials. In the application, a sodium hydroxide-urea-thiourea ternary system is used to fully dissolve cellulose, the cellulose is modified by 2,3-epoxypropyl trimethylammonium chloride cation, a PVDF membrane is used as a base, and a hydrophilic composite filter membrane is prepared by vacuum filtration and loading of a cationized cellulose layer. The preparation process is mild, and the defects of the traditional cellulose membrane, such as insufficient dissolution, uneven pore size and poor screening precision, are solved. The filter membrane surface is positively charged, the hydrophilicity is greatly improved, the water contact angle is only 39°, the particle size of 50-500 nm carboxylated nanometer plastics can be efficiently intercepted, the removal efficiency of 100 nm polystyrene nanometer plastics reaches 97.01%, and the water flux is excellent. The process is green and low-cost, can remove polystyrene, polymethyl methacrylate and polyvinyl chloride nanometer plastics in a wide range, and has a good engineering application prospect in the field of deep treatment of water body nanometer plastic pollution.

The invention discloses a heteromorphic covalent organic framework membrane as well as a preparation method and application thereof, and belongs to the technical field of separation membrane materials. The method comprises the following steps: firstly, synthesizing a COF nanosheet colloidal solution through a homogeneous solution method; then carrying out suction filtration on the colloidal solution to a porous supporting base membrane to form a crystalline COF layer; and finally, growing an amorphous COF layer on the surface of the crystalline COF layer in situ through interfacial polymerization, and carrying out heat treatment to obtain the heteromorphic covalent organic framework film. According to the invention, the rigid crystalline COF is used for providing a long-range ordered pore channel, the flexible amorphous COF is used for strengthening the controllable processability to make up the defect, a rigid-flexible heteromorphic configuration is formed, and the construction of the continuous defect-free COF film is realized. The preparation method is simple, the characteristics of a crystalline state and an amorphous state are coupled, a multi-layer sub-nanometer mass transfer channel is formed in the membrane, high permeability and high rejection rate are shown in the separation process of organic pollutants in water, and good long-term separation stability is achieved.