152 results about "Mass transfer rate" patented technology

The invention discloses a wastewater treatment intelligent monitoring method and device based on big data and a medium, and relates to the technical field of environmental engineering, and the method comprises the steps: based on a structured data set, combining a wastewater treatment process, constructing a mass conservation equation, mass transfer rate constraint and reaction kinetics constraint, and generating a state variable set with mechanism constraint; according to the state variable set, constructing a time sequence prediction model based on a long short-term memory network, and obtaining a prediction result in combination with mechanism constraints; and by taking the emission standard limit value, the equipment operation boundary condition and the process safety range as constraint conditions, establishing a multi-objective optimization function of energy consumption, the water quality standard reaching rate and the medicament dosage, and performing quantitative modeling in combination with a prediction result to generate a multi-objective optimization model. According to the invention, scientificity and reliability of prediction input are improved, and cooperative control of energy saving, standard reaching and cost is realized.

The invention discloses a method for preparing an adsorption material for simultaneously extracting rubidium and cesium by using soft / hard template co-assembly and application, and belongs to the technical field of adsorption material preparation. The invention aims to solve the problems that a traditional adsorbent is poor in selectivity to similar alkali metal ions, slow in mass transfer rate, insufficient in acid environment stability and lack of an adsorption material for specific recognition of rubidium and cesium ions. The method comprises the following steps: 1, preparing cesium-imprinted hierarchical-pore mesoporous silica; 2, Cs / Rb-HMS is prepared; according to the invention, a macroporous-mesoporous channel is constructed; wherein a large hole (PS template) provides a rapid mass transmission channel, and an ion diffusion path is remarkably shortened, so that target ions can rapidly reach adsorption sites in the material; mesopores (Pluronic F127 template) provide a huge specific surface area and load a large number of Cs < + > imprinting sites and Rb < + > imprinting polymer layers, so that high adsorption capacity to Cs < + > and Rb < + > is ensured.

The utility model discloses a device for treating deeper bottom mud in situ by utilizing gas stripping, and relates to the technical field of water environment pollution treatment. The device comprises a gas stripping lifting pipe and a water body moving device, a stirring machine is installed on the top face of the gas stripping lifting pipe in a sliding mode, a plurality of impellers are arranged at the output end of the stirring machine, a bottom mud backflow pipe is fixedly arranged on the outer surface of the gas stripping lifting pipe in a sleeved mode, and the bottom mud backflow pipe is installed on one side of the water body moving device in a sliding mode. A plurality of gas stripping mud pipes are arranged on the outer surface of the top of the gas stripping lifting pipe, deep bottom mud is subjected to gas stripping lifting, then reoxygenation and chemical adding are conducted, then the deep bottom mud returns to a bottom mud layer, a slow-release carbon source, a phosphorus removal chemical and nitrate are brought to the bottom mud layer with insufficient oxygen, and pollutants in the bottom mud are removed in situ. The loosening of the bottom mud layer can enhance the mass transfer rate in the bottom mud, and an anoxic environment is formed in the bottom mud layer. According to the in-situ bottom mud treatment device, in-situ bottom mud treatment is realized in a simple manner.

The invention discloses a method for preparing a membrane electrode of a proton exchange membrane fuel cell by a template method. The method comprises the following steps: 1) selecting a nano material as a template agent; 2) fixing a template agent on a proton exchange membrane to obtain a proton exchange membrane A; 3) uniformly mixing a catalyst, a solvent and an ionomer to form catalyst ink; 4) spraying the catalyst ink on the proton exchange membrane A and drying to obtain a proton exchange membrane B; 5) placing the proton exchange membrane B in an etching solution to obtain a proton exchange membrane C; and 6) tightly attaching the proton exchange membrane C to the gas diffusion layer, and then carrying out hot pressing at high temperature and high pressure by a hot press to finally obtain the membrane electrode of the proton exchange membrane fuel cell. According to the membrane electrode prepared by the preparation method, an ordered pore channel structure can be constructed in the catalyst layer, so that the mass transfer rate of oxygen and water in the catalyst layer is improved, and the performance of a proton exchange membrane fuel cell is improved.

The invention discloses a method and system for continuously synthesizing 2, 4-dichloroacetophenone, and the method for continuously synthesizing 2, 4-dichloroacetophenone comprises the following steps: S1, mixing m-dichlorobenzene and a catalyst to form a turbid liquid, and continuously inputting the turbid liquid into a tubular reactor; s2, enabling gas-phase acetyl chloride to pass through a micro-interface generator to form micron-sized microbubbles, continuously inputting the micron-sized microbubbles into a tubular reactor, and carrying out mixed reaction on the micron-sized microbubbles and the turbid liquid to obtain a mixed reaction liquid; and S3, continuously inputting the mixed reaction liquid and water into a hydrolysis reactor, and carrying out hydrolysis and separation to obtain 2, 4-dichloroacetophenone. According to the invention, the traditional kettle type stirring reaction is changed into micro-interface reaction, and the mass transfer area and the total mass transfer rate among multiple phases can be multiplied, so that the reaction rate is greatly improved, the side reaction is effectively controlled, and meanwhile, the product yield, the reaction safety and the like are improved.

The application discloses a Pickering emulsion based on ring-shaped colloidal particles, a preparation method thereof and application thereof in biphasic interface catalysis. The Pickering emulsion is an oil-in-water emulsion, which comprises a water phase, an oil phase and ring-shaped colloidal particles. The oil phase is dispersed in the water phase in the form of small droplets. The ring-shaped colloidal particles are located at an oil-water interface or at the oil-water interface and the water phase, and the ring-shaped colloidal particles are assembled to form a monolayer structure on the oil-water interface. The Pickering emulsion is not only beneficial to the contact between reactants or between the reactants and a catalyst, but also can enhance the interface mass transfer rate, promote the product to rapidly diffuse from one phase to another phase, has advantages of high conversion rate, high catalytic efficiency, simple product separation and the like, and has an important application prospect in the field of interface catalysis.

The application discloses a preparation method of a high-activity multi-level-pore boronic acid imprinting hydrogel microsphere adsorbent and application of the adsorbent to selective adsorption of a flavonoid compound naringin (NRG). The application enhances surface functionalization of COFs by dopamine modification, prepares thiol functionalized covalent organic framework microspheres, synthesizes thiol microspheres by using an emulsion interfacial polymerization method, prepares COFs boron affinity imprinting microsphere adsorbents based on boron affinity, and applies the adsorbents to selective adsorption of NRG in agricultural wastewater. The prepared adsorbent has a significant multi-layer adsorption effect, and the adsorption capacity is significantly improved by using boron affinity. The multi-level-pore structure of the COFs microspheres provides abundant sites for adsorption, and significantly improves the mass transfer rate. In addition, the prepared adsorbent has significant specificity in adsorption and separation of NRG, and provides a promising adsorption material for industrialized separation of NRG.

The application discloses a novel advanced oxidation device which comprises an outer shell, a gas-liquid mixing chamber, an ultrasonic atomization disc, an air inlet hole, a water inlet hole, an ozone generator, a UV reaction disc tube and the like. Through ultrasonic catalysis and ultraviolet light catalysis, O3 is excited to generate a large amount of higher oxidizing ·OH, the mixing degree and turbulence intensity of ozone and sewage are improved, the mass transfer coefficient is increased, the mass transfer rate of ozone is improved, four-stage oxidation reactions are carried out in one reactor, and thus the ozone oxidation efficiency and effect are greatly improved, the pollutants in the wastewater are subjected to intensified oxidation, and thus the pollutants in the wastewater are degraded and removed.

The present invention provides mesh rolled scaffold devices and bioreactor systems that can provide a large surface-to-volume ratio for expanded cell culture. The mesh rolled scaffolds minimize shear stress on cultured cells and support sufficient and uniform mass transfer rates of gases and nutrients. The mesh rolled scaffolds can be connected to a media source via holders in bioreactor systems to support large-scale expansion and maintenance of cell cultures. The present invention also provides the bioreactor systems that can include dialyzers and heat exchangers to modify media and other fluids passing through the systems. The bioreactor systems include media and other fluid reservoirs that can support high stirring rates between about 100 and 10000 rpm, and the overall systems can be pressurized between about 1 and 10 atm to increase gas exchange rates.

The invention relates to the technical field of adsorption materials, and particularly discloses a molecularly imprinted hydrogen bond organic framework adsorption material as well as a preparation method and application thereof. According to the material, tetra (4-sulfonyl phenyl) methane and 1, 1 '-diamino-4, 4'-dipyridyl diiodide are used as construction units to form a hydrogen bond organic framework substrate, and a hemp essence drug template molecule is introduced to construct a specific imprinting hole in the hemp essence drug template molecule. The preparation method is characterized in that the molar ratio X of template molecules to tetra (4-sulfonyl phenyl) methane is controlled to be 0.05-0.5, crystallization is performed in a water / methanol mixed solvent, and then elution and activation are performed through an acid solution with the pH being 2-4. The material has the advantages of high adsorption capacity, no less than 58 mg / g of template molecule adsorption capacity, high selectivity and rapid adsorption kinetics, achieves balance within 5 minutes, can efficiently enrich trace hemp extract drugs from a water environment or biological fluid, and solves the technical problem that the selectivity, the capacity and the mass transfer rate of the existing adsorption material are difficult to consider at the same time.

The application discloses a solid-phase preparation method of sulfonated chitosan membrane and application of the sulfonated chitosan membrane in catalytic biodiesel preparation, and the sulfonated chitosan membrane is prepared by the following steps: chitosan powder is suspended in a dispersant in which a sulfonating agent is dissolved to perform a sulfonating reaction, sulfonated chitosan powder is obtained through solid-liquid separation, the sulfonated chitosan powder is dissolved in a membrane solvent to prepare a casting membrane liquid, the casting membrane liquid is naturally cast on a glass surface to form a membrane, and the sulfonated chitosan membrane is obtained after drying and removing the membrane solvent. The sulfonated chitosan membrane is added into a mixed solution of fatty acid and methanol, and after stirring and heating for a period of time, the sulfonated chitosan membrane is taken out, and biodiesel is obtained after removing methanol from the solution. The sulfonated chitosan membrane prepared by the application has the advantages of fast mass transfer rate, high catalytic efficiency and easy separation, and under the conditions of an alcohol / oil ratio of 10:1, a reaction temperature of 65 DEG C, a catalyst dosage of 5wt%, and a reaction time of 3h, the esterification rate reaches 92.29%. Under the same conditions, the esterification rates of powdered chitosan and commercially available macroporous ion exchange resin are 57.73% and 33.0% respectively.

The application provides a full-core fouling deposition prediction method and device based on a porous medium model. The method comprises the following steps: S1, modeling a pressurized water reactor core as a porous medium model and performing regular coarse grid division; S2, solving the porous medium model based on a core power distribution obtained in a previous iteration step to obtain a flow field and a phase field distribution at the current iteration step; S3, calculating a fuel rod cladding surface temperature based on the core power distribution and the flow field and the phase field distribution; S4, calculating a phase change mass transfer rate by using a boiling phase change rate model based on the cladding surface temperature and local thermal parameters; S5, calculating a fouling deposition rate by using a deposition model based on total mass balance based on the phase change mass transfer rate; S6, calculating a fouling deposition mass and a boron compound mass according to the fouling deposition rate; and S7, performing neutron calculation by taking the fouling deposition mass and the boron compound mass as input to obtain an updated core power distribution.

The invention discloses a supergravity device capable of promoting foaming and devolatilization of a high-viscosity polymer and an application method. The supergravity device comprises a shell, a motor, a distribution disc, a rotor, an ultrasonic generation device, a liquid feeding hole, a gas outlet, a liquid discharging hole and a gas inlet, a rotating shaft of the motor penetrates through the lower surface of the shell and extends into the shell; the upper end of the rotating shaft is fixedly connected with the rotor; a packing ring is fixed on the circumference of the upper surface of the rotor, and a cavity structure in the middle of the packing ring forms a liquid inlet cavity; a distribution disc fixedly connected with the upper surface of the rotor is horizontally arranged in the liquid inlet cavity; the motor is connected with the rotor through a rotating shaft; according to the method, ultrasonic energy is introduced into a super-gravity field, liquid film updating is enhanced through the sound field cavitation and fluid disturbance effect, and multi-scale coupling of the sound field and the gravity field is achieved in combination with interface structure and wettability regulation and control, so that the gas-liquid mass transfer rate and devolatilization efficiency are remarkably improved, and the TDI removal rate is larger than or equal to 90%.

A method for improving the denitrification efficiency of a sulfur autotrophic denitrification and anaerobic ammonia oxidation coupling system comprises the following steps: S1, when the denitrification load is limited and the mass transfer rate in particles is reduced, determining the abundance of filamentous bacteria or determining the length of filaments outside sludge through a molecular biological technique to judge whether the filamentous bacteria overgrow or not; when the abundance ratio of the filamentous bacteria reaches 10%-50% or the length (FLA) of the filamentous substances outside the sludge is 10-50 microns, it can be judged that the filamentous bacteria grow excessively; and S2, continuously adding a hydroxylamine conditioning agent and / or a hydrazine conditioning agent into the reactor, and operating the reactor for 10-30 days. According to the method, excessive reproduction of filamentous bacteria in the coupling system can be effectively controlled, more importantly, the denitrification performance of the coupling system can be improved, the anaerobic ammonia oxidation activity is enhanced, and therefore the operation efficiency of the coupling system is promoted.

The invention belongs to the technical field of oil and gas field development and research, and relates to a method and system for predicting the solubility of a non-Newtonian polymer in a forced stretching device and a readable medium, and the method comprises the following steps: obtaining the viscosity of a target polymer after natural dissolution, and fitting an intrinsic equation according to the viscosity; based on the intrinsic equation and the swelling behavior of the polymer particles, establishing a swelling double-fluid model, and inputting the mass transfer rate of the non-Newtonian polymer into the swelling double-fluid model to generate a liquid phase volume fraction and a solid phase volume fraction; inputting the volume fractions of the liquid phase and the solid phase into a component transport equation to generate the mass fractions of all components in the solid phase so as to obtain the solid density; inputting the liquid-phase and solid-phase volume fractions into the group equilibrium model to generate the average particle size of solid-phase particles; coupling output results in the swelling double-fluid model, the component transport equation and the group balance model to obtain the dissolving property of the non-Newtonian polymer. The method can more accurately predict the behavior characteristics of particles in non-Newtonian complex fluid so as to realize the process optimization of polymer rapid dissolution configuration.

The invention belongs to the technical field of environmental functional material preparation, and discloses a hierarchical pore boric acid imprinted silicon wafer adsorbent and a preparation method and application thereof. Mesoporous silica with vertical pore channels is formed through nano shearing of the microemulsion, and the mass transfer rate and adsorption site accessibility can be effectively improved. In order to improve the stability of specific recognition, a covalent organic framework and boric acid ester affinity MIPs are modified on silicon dioxide, so that the accessibility and uniformity of imprinting recognition sites are effectively improved. Due to the combined action of a borate affinity strategy and an imprinting cavity effect, the adsorbent can specifically capture NRG molecules in a complex sample environment.

The utility model provides an efficient carbonizer for purifying lithium carbonate, which comprises a carbonizer main body, the top of the carbonizer main body is provided with a feed port and a gas outlet, the bottom of the carbonizer main body is provided with a gas inlet and a discharge port, and the feed port at the top is provided with a feed nozzle and uniformly sprays lithium-containing slurry into the carbonizer main body. The gas outlet is externally connected with a micro-nano bubble generator and a supercharger, carbon dioxide is treated into nano-scale bubbles and then pressurized into the carbonization tower main body, and an ultrasonic generator is mounted in the carbonization tower main body and emits ultrasonic waves for improving the mass transfer rate during reaction. The solubility of the carbon dioxide is improved, the contact reaction area between the carbon dioxide and the lithium-containing slurry in the carbonization tower is increased, the utilization rate of the carbon dioxide is improved, and the production cost is reduced.

The invention provides a device system and method for preparing high-purity lithium carbonate through micron / nano bubble deep carbonization-pyrolysis. The device system comprises a slurrying device, a first-stage deep carbonization device, a second-stage deep carbonization device, a pyrolysis device, a nano bubble generator, a first-stage micro bubble generator and a second-stage micro bubble generator. The slurrying device, the first-stage deep carbonization device, the second-stage deep carbonization device and the pyrolysis device are sequentially connected along the material flow direction; the first-stage deep carbonization device is bidirectionally connected with the first-stage microbubble generator; the secondary deep carbonization device is bidirectionally connected with the nano bubble generator; and the pyrolysis device is bidirectionally connected with the secondary microbubble generator. A micro-bubble generator or a nano-bubble generator is introduced into the first-stage deep carbonization device, the second-stage deep carbonization device and the pyrolysis device, so that the CO2 mass transfer rate is increased, the deep carbonization of lithium carbonate and the pyrolysis process of lithium bicarbonate are enhanced, and a uniform and fine high-purity lithium carbonate product can be efficiently prepared.

Embodiments of the present specification provide a crystal growth apparatus and a raw material recovery method, the apparatus comprising: a crucible for accommodating a crystal growth raw material; at least part of the seed crystal support can be immersed in a melt formed by the crystal growth raw materials in the crucible; the seed crystal support comprises a seed crystal bonding surface; the first supporting structure is connected with one side, opposite to the seed crystal bonding surface, of the seed crystal holder, and the first supporting structure is configured to drive the seed crystal holder to rotate. The first supporting structure is arranged to drive the seed crystal holder in the crucible to rotate, so that the mass transfer rate is increased, and the crystal growth speed is increased; meanwhile, the rotation of the seed crystal support can also improve the radial solute distribution uniformity of the seed crystal bonding surface and improve the growth quality of the crystal.

This invention belongs to the field of waste plastic treatment technology, specifically relating to a method for producing light aromatics from waste polyolefin plastics through catalytic pyrolysis. This invention utilizes an ultra-dilute liquid-phase coating method to coat a microporous molecular sieve ZSM-5 within an ordered mesoporous layer SBA-15, creating a coated catalyst ZSM-5@SBA-15 with an encapsulation thickness of 60–185 nm. This coated catalyst possesses an ordered mesoporous encapsulation layer, which can pre-decompose and enrich the volatiles from plastic pyrolysis during the reaction, thereby improving the mass transfer rate, promoting the formation of light aromatics, and inhibiting the formation of large-chain hydrocarbons during catalytic pyrolysis, achieving efficient production of light aromatics from waste polyolefin plastics through catalytic pyrolysis. Compared to traditional ZSM-5, when the encapsulation thickness of ZSM-5@SBA-15 is 90 nm, the yield of light aromatics is 31.02 wt.%, an increase of 49.14%, while simultaneously reducing heavy-chain hydrocarbon byproducts by 42.17%.

The present invention relates to the technical field of pollutant treatment, in particular to an amine-fluorine bifunctional hydrogel adsorbent, and preparation and use thereof. The present invention provides a preparation method of an amine-fluorine bifunctional hydrogel adsorbent, which comprises the following steps: uniformly mixing a fluorine-containing alkene monomer, a quaternary ammonium salt alkene monomer, a traditional Chinese medicine residue cellulose dispersion liquid, N,N′-methylene bisacrylamide and ammonium persulfate, and sequentially carrying out heating reaction, deionized water swelling and drying to obtain the amine-fluorine bifunctional hydrogel adsorbent. According to the present invention, the quaternary ammonium salt alkene monomer is introduced as a hydrophilic monomer, and the fluorine-containing alkene monomer is introduced as a hydrophobic monomer, so that the amine-fluorine bifunctional hydrogel adsorbent has a hydrophilic amine and hydrophobic fluorine dual-network interpenetrating porous structure, and the structure enhances water transmission and the mass transfer rate of a per- nd polyfluoroalkyl substance.

The application belongs to the technical field of preparation of adsorption separation functional materials, and discloses a construction method of polyol functionalized hollow covalent organic framework and boron removal application thereof. The application uses a silicon template method to induce covalent organic framework COFs to deposit and grow on the surface of a silicon medium, and through a reversible covalent bond regulation technology as a core, reaction conditions such as solvents, reaction temperatures and monomers are accurately designed, and through a synergistic strategy, the functionalization and structure optimization of the COFs layer adsorbent are simultaneously realized, and then the silicon template is removed through a reversible bond locking strategy to stabilize the COFs layer, thereby a COFs adsorbent with a hollow structure and a high monomer loading capacity is prepared and used for deep and rapid removal of boron in an aqueous solution. The application proposes a simple strategy that can simultaneously realize the functionalization and reconstruction optimization of COFs, and the prepared adsorbent has novel structure, controllable size, simple preparation process, fast mass transfer rate, large adsorption capacity, easy recovery and good regeneration performance.

The invention relates to a method for rapidly solving gasification and combustion of single-particle biomass coke, and belongs to the technical field of biomass thermochemical conversion simulation. In order to solve the problem that the reaction rate, the heating rate and the mass transfer process are overestimated due to the fact that a traditional zero-dimensional model neglects mass transfer and heat transfer resistance in particles, the difference between the zero-dimensional model and a one-dimensional model in the aspect of transfer behaviors in the particles is compared and analyzed through a system; a mass transfer rate correction factor (HM), a heat transfer rate correction factor (HT) and a reaction rate correction factor (HR) are introduced to construct a corrected zero-dimensional particle model. According to the model, on the basis that the calculation efficiency advantage of a zero-dimensional model is reserved, the prediction precision of the particle internal transfer effect and the influence of the particle internal transfer effect on the reaction process is remarkably improved. Besides, the method can be efficiently coupled with a computational fluid dynamics (CFD) method, an effective tool is provided for realizing high-precision and high-efficiency numerical simulation of the biomass gasification and combustion reactor, and a theoretical basis is laid for engineering amplification and operation optimization of the biomass gasification and combustion reactor.

The invention discloses a wastewater treatment system and method for catalytic wet oxidation, and the treatment system comprises a vortex bubble generator; the oxidation reactor is positioned at the downstream of the vortex bubble generator; the heater is positioned at the upstream of the vortex bubble generator; and a preheater located upstream of the heater. According to the treatment system disclosed by the invention, the vortex effect of the wastewater is enhanced under the dual effects of the flow guide slit and the flow guide spiral of the vortex bubble generator, and the micro-nano bubble generation efficiency is improved. In the catalytic wet oxidation reaction process, oxygen enters the oxidation reactor in the form of micro-nano bubbles, and compared with millimeter-scale bubbles in a traditional gas distribution mode, the retention time of the oxygen is prolonged, the specific surface area of the bubbles is large, the gas-liquid mass transfer rate is increased, the generation rate of free radicals is increased, and the catalytic wet oxidation reaction efficiency is improved. Meanwhile, oxygen enters the oxidation reactor in the form of micro-nano bubbles, so that the consumption of the oxygen is reduced while the reaction efficiency is improved.

The utility model discloses a multifunctional environment-friendly packed tower internal part which comprises a first mounting cylinder, an expansion ring is mounted on the outer side of the top end of the first mounting cylinder, a placement groove is formed in the inner side wall of the first mounting cylinder, a second mounting cylinder is clamped to the bottom end of the first mounting cylinder, and a mass transfer structure is mounted in the second mounting cylinder. The mass transfer structure comprises a first metal mesh, a second metal mesh, a third metal mesh and rhombic holes. According to the utility model, a plurality of groups of first metal meshes, second metal meshes and third metal meshes are mounted in the second mounting cylinder, so that the cost can be reduced by more than 30% compared with that of metal wire mesh corrugated packing under the same separation condition, the gas-liquid mass transfer rate is greatly improved due to the arrangement of the rhombic holes, the gas-liquid mass transfer efficiency can be effectively improved, and the gas-liquid separation efficiency is improved. And the gaps among the first metal mesh, the second metal mesh and the third metal mesh can further reduce the pressure drop and reduce the generation of wall flow, so that the aim of improving the gas-liquid mass transfer efficiency of the packed tower internals can be achieved.

The present application relates to the technical field of catalyst, in particular to a preparation method of TS-1 molecular sieve for olefin epoxidation; the main preparation method is as follows: tetraethyl orthosilicate is added dropwise into an aqueous solution containing tetrapropylammonium hydroxide; after the solution is clarified, a solution containing tetrabutyl titanate and isopropanol is added dropwise; after hydrolysis is completed, guanidine acetate is added; the precursor solution is obtained after stirring at a certain temperature for a period of time; the obtained solution is loaded into a kettle, and the crystallization product is obtained after hydrothermal crystallization; finally, the sheet-shaped TS-1 molecular sieve is obtained through centrifugation, drying and calcination; the present application has low cost, simple operation, short synthesis period, small size in the b-axis direction, improved diffusion mass transfer rate, and good catalytic activity in 1-hexene epoxidation, cyclohexene epoxidation, propylene epoxidation, chloropropylene epoxidation and phenol hydroxylation reaction.

The present application relates to the field of catalytic materials for atmospheric pollutant control and discloses a pulse current-enhanced MOF-based catalyst, a preparation method therefor and a use thereof. In the present application, the method comprises: dissolving a copper salt and polyvinylpyrrolidone in a mixed solution of DMF and ethanol, and then adding formic acid; dissolving Cu-TCPP in the mixed solution of DMF and ethanol; then mixing the solutions obtained in the steps above until the solutions are uniformly dispersed, and heating and drying the mixture to obtain PML-Cu; weighing PML-Cu and calcining same in an inert gas to obtain PML-CuNPs; and using a pulse current to treat the PML-CuNPs to obtain Pulse-PML-CuNPs. In the present method, an active center is generated in situ in a two-dimensional MOF-based material Cu-TCPP by means of a node metal in-situ reduction method, and a synthesized two-dimensional MOF-based electrocatalyst PML-CuNPs has a single atomic layer structure and can maximize mass transfer rate. By means of the pulse current method, the present application further changes the surface state of the active center, and changes the surface roughness and valence state of Cu nanoparticles, thereby enhancing the reaction efficiency of electroreduction of CO2 into a multi-carbon product.

The utility model relates to the field of water treatment equipment, in particular to a rotational flow aeration type Fenton device. The utility model discloses a rotational flow aeration type Fenton device which comprises a Fenton reaction tower body, a water inlet is formed in one side of the bottom of the Fenton reaction tower body, a water outlet is formed in the top of the other side of the Fenton reaction tower body, a water collecting area is arranged in the middle of the Fenton reaction tower body, an aeration pipe is arranged in the water collecting area, and a rotational flow aerator is arranged at one end of the aeration pipe. According to the utility model, gas enters from the bottom of the spiral-flow aerator and is mixed with sewage, and in the spiral-flow aerator, the mixture of the gas and the sewage is cut and crushed for multiple times in the high-speed rotation process to form a large number of ultramicro bubbles. By utilizing a rotational flow principle, bubbles and sewage are fully mixed, and the dissolution rate, the mass transfer rate and the oxygen utilization rate of oxygen are increased. And meanwhile, the rotational flow can promote the suspension and mixing of the sludge and prevent the sludge from precipitating. According to the spiral-flow aerator, the aeration energy consumption is reduced through efficient gas dispersion and low-resistance design.

The invention discloses a green and environment-friendly synthesis method for preparing a high-crystallinity mesoporous ZSM-5 molecular sieve and application thereof, and belongs to the technical field of catalysts and synthesis thereof. On the basis of a template-free synthesis scheme, a mother liquor waste liquid with a template is added as a seed crystal liquid to prepare a high-crystallinity ZSM-5 molecular sieve, and then the high-crystallinity mesoporous ZSM-5 molecular sieve is prepared through alkali treatment. The ZSM-5 molecular sieve prepared by the invention does not need to be roasted in the whole preparation process, is a green and environment-friendly synthesis route, and can effectively save the production cost and reduce the energy consumption. The molecular sieve has a rich pore structure and a larger specific surface area at the same time, oil and gas components can enter pores of the molecular sieve easily, the diffusion path is short, the mass transfer rate in the reaction process is higher, the generated product can be rapidly diffused out, and the conversion rate of the molecular sieve in the cyclohexene hydration reaction can be effectively improved.

The application discloses a kind of pulse current enhanced MOF-based catalyst and its preparation method and application, belong to the catalytic material field of atmospheric pollutant control.The copper salt is dissolved in the mixed solution of DMF and ethanol with polyvinylpyrrolidone, and then formic acid is added;Cu-TCPP is dissolved in the mixed solution of DMF and ethanol;The above-mentioned solution is mixed and dispersed uniformly, and then heated and dried to obtain PML-Cu;PML-Cu is taken in inert gas calcination to obtain PML-CuNPs;Pulse-PML-CuNPs is obtained by treating PML-CuNPs with pulse current.This method generates active centers in-situ in two-dimensional MOF-based material Cu-TCPP by node metal in-situ reduction method, and the synthesized two-dimensional MOF-based electrocatalyst PML-CuNPs has monatomic layer structure, which can maximize mass transfer rate;The application also changes the surface state of active center by pulse current method, changes the surface roughness and valence state of Cu nanoparticles, and enhances the reaction efficiency of CO2 electroreduction to multi-carbon products.