18results about How to "Achieve selective adsorption" patented technology

The invention belongs to the technical field of pervaporation membrane preparation and application, and relates to a covalent organic framework pervaporation hybrid membrane with a combination sequence regulation interlayer structure, in particular to preparation of the pervaporation membrane and application of the pervaporation membrane in water / butanol separation. Adding the aldehyde monomer solution into the amino monomer solution, and standing for reaction; taking a water phase, and carrying out dialysis treatment; diluting the covalent organic framework nanosheet dispersion liquid to obtain dispersion liquid A; adjusting the pH of a polyelectrolyte aqueous solution to obtain a solution B; adjusting the pH value of the metal ion dispersion liquid to obtain a solution C; uniformly mixing the dispersion liquid A and the solution C at normal temperature, adding the solution B, and heating for reaction to obtain a membrane casting liquid; and carrying out suction filtration on the membrane casting solution to a base membrane, and carrying out vacuum drying to obtain the pervaporation membrane. At 70 DEG C, the separation flux of a 10wt% / 90wt% water / butanol mixture is 7.52 g / (m < 2 > h), and the separation factor reaches 13709.

The invention discloses an attapulgite-fly ash composite adsorbent as well as a preparation method and application thereof, and the preparation method comprises the following steps: crushing, grinding and screening natural attapulgite, mixing with dilute sulphuric acid, carrying out constant-temperature oscillation treatment, washing to remove residual dilute sulphuric acid after reaction, filtering and drying to obtain acidified attapulgite; the preparation method comprises the following steps: adding acidified attapulgite into deionized water, heating and stirring, adding lanthanum chloride heptahydrate and polyaluminum chloride powder, and dropwise adding ammonia water at the same time to realize loading of lanthanum and aluminum on the surface of the acidified attapulgite; after heating and stirring, filtering and drying to obtain modified attapulgite; and mixing the modified attapulgite with fly ash, then carrying out mechanical grinding treatment, putting the ground sample into a tubular furnace, and carrying out anaerobic roasting to obtain the attapulgite-fly ash defluorination adsorbent. The attapulgite-fly ash defluorination adsorbent prepared by the invention has relatively strong selectivity and specific adsorption effect on fluorine ions in wastewater discharged by a chemical plant, and has renewability.

The invention relates to the technical field of wastewater treatment, in particular to a magnetic Fe3O4-coated UiO-66 composite material as well as a preparation method and application thereof. According to the specific technical scheme, sodium citrate dehydrate, ferric chloride hexahydrate and urea are dissolved in water at the room temperature, polyacrylamide is added for ultrasonic treatment, UiO-66 is added for continuous ultrasonic treatment, then a reaction is conducted at the high temperature, after the reaction is completed, an obtained product is recovered through magnetic separation, and the recovered sample is washed and dried to obtain the iron-based composite material. And the magnetic Fe3O4 and UiO-66 composite material is obtained. Through research and development of the Fe3O4-coated UiO-66 composite material, an effective scheme integrating the advantages of excellent adsorption capacity and convenient separation is provided for solving the problem of remediation of radioactive uranium pollution in water.

The present invention proposes a dual MOFs functional composite material for VOCs gas adsorption and degradation to produce methane. The dual MOFs heterogeneous structure can be used as a highly adjustable platform by adjusting the molar ratio of metal particles, and the pore structure can be adjusted according to the target gas to be adsorbed to achieve selective adsorption. Secondly, NH2-UIO-66 is a low-cost, non-toxic, and highly catalytically active adsorption and degradation material that can effectively ensure the degradation efficiency of VOCs gas molecules.

The invention belongs to the technical field of uranium extraction from seawater, and discloses a porous hydrogen bond material for extracting uranium from seawater and a preparation method of the porous hydrogen bond material. The preparation method comprises the following steps: in a solvent containing inorganic base, taking a cyano compound and hydroxylamine hydrochloride as raw materials, and carrying out heating and stirring reaction to obtain an amidoxime compound; the preparation method comprises the following steps: dissolving an amidoxime compound in an organic solvent, and volatilizing at room temperature to obtain the porous hydrogen bond material for extracting uranium from seawater. The preparation method is simple and easy for industrial production. The prepared porous hydrogen bond material has a three-dimensional structure with uniformly distributed pore channels, uranium in seawater can be selectively adsorbed through a pore channel screening effect, the adsorption capacity of U is about 50 times that of V, the optimal pH range of the porous hydrogen bond material is 7-8, and the condition that the pH of real seawater is 8 is better met.

The invention discloses a solar water evaporation adsorption material as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment. Stirring and reacting the polydopamine modified zeolite imidazate framework material with the pre-oxidized nano cellulose solution and the polyvinyl alcohol solution to form a viscous liquid, transferring the viscous liquid into a mold, and sequentially performing standing and bubble removal, freeze forming and freeze drying to obtain the polydopamine modified zeolite imidazate framework material. The solar water evaporation adsorption material is formed by a zeolite imidazate framework material which is formed by the pre-oxidized nanocellulose and the polyvinyl alcohol and is modified by loading polydopamine on a dual-network structure. The composite material has the characteristic of high stability, is endowed with a photo-thermal conversion function and rare earth ion adsorption activity at the same time, can promote water evaporation and accelerate mass transfer of rare earth ions in an aqueous solution and combination of adsorption active sites by utilizing solar radiation so as to accelerate adsorption kinetics of the rare earth ions, and can be used for rare earth wastewater treatment. The method is especially suitable for low-concentration rare earth wastewater treatment.

The invention belongs to the technical field of functional materials, and discloses a functional temperature-sensitive surfactant for HRP (horse radish peroxidase) in selective froth flotation crude extract as well as a preparation method and application of the functional temperature-sensitive surfactant. A hydrophilic temperature-sensitive monomer acrylamide AAm, a hydrophobic monomer acrylonitrile AN and a monomer glycidyl methacrylate GMA with an epoxy group are used as polymeric monomers, RAFT polymerization is performed to obtain the temperature-sensitive surfactant P (AAm-co-AN-co-GMA), the surface tension is regulated and controlled by regulating and controlling the length and temperature of a hydrophobic chain segment, and the temperature-sensitive surface active agent P (AAm-co-AN-co-GMA) is obtained. The performance and the switchable foam stability regulation effect are tested. Based on the excellent foam stabilizing performance of the temperature-sensitive surfactant and the high specific binding capacity of the aptamer to a target enzyme, the aptamer is modified to the temperature-sensitive surfactant, and the selectively functionalized temperature-sensitive surfactant P (AAm-co-AN-co-GMA)-Apt is prepared. HRP in a crude extract prepared from fresh horseradish is taken as a research target, and high-affinity binding and selective froth flotation of P (AAm-co-AN-co-GMA)-Apt to HRP are realized.

The application discloses a kind of fibrous felt that can be all-weather fast recovery high viscosity crude oil, preparation method and its application.The fibrous felt includes the fibrous substrate formed by profiled cross-section fiber, and the binder layer, functional layer and hydrophobic coating sequentially loaded on its surface;Functional layer is used to generate Joule heat when energized and generate photo-thermal effect under light;The water contact angle of fibrous felt is greater than 140°.The application also provides its preparation method and application.The application integrates photo-thermal and Joule heat effect in the same felt, realizes all-weather operation ability;Use C-shaped or Y-shaped profiled cross-section fiber, accelerate the penetration and absorption of high viscosity crude oil;Through the synergistic effect of polypyrrole layer and MXene layer, the resistance is significantly reduced and the oil absorption time is shortened.The fibrous felt of the application has simple preparation process, and is suitable for all-weather oil spill recovery in complex environment such as ocean oil spill.

The invention discloses a COFs composite membrane based on multi-scale simulation, a preparation method and application, and belongs to the technical field of theoretical computation.The COFs composite membrane based on multi-scale simulation is prepared by simulating interaction energy between polymers and COFs at the full-atomic scale, then simulating data of the polymer-COFs membrane at the overall and mesoscale by taking molecular fragments as a whole, and then replacing different membrane-forming polymers to obtain the COFs composite membrane based on multi-scale simulation. The method comprises the following steps: by taking COFs as a raw material, simulating the influence of the COFs on compatibility and a membrane structure, changing solvent types, simulating the influence of the COFs on a phase separation behavior and a pore structure in a membrane forming process, finally obtaining a simulated polymer-COFs, and preparing and verifying a theoretical result; the COFs composite membrane prepared through the simulation method is applied to a water body containing heavy metal ions, selective adsorption of gold ions is achieved, the composite membrane can be recycled for 5 times or above, and the Au < 3 + > adsorption amount still keeps 85% or above of the initial value.

The application discloses a solar water evaporation and adsorption material, a preparation method and application thereof, and belongs to the technical field of wastewater treatment. A polydopamine modified zeolitic imidazolate framework material is stirred and reacted with a pre-oxidized nanocellulose solution and a polyvinyl alcohol solution to form a viscous liquid, the viscous liquid is transferred into a mold, and static bubble removal, freeze forming and freeze drying are sequentially performed, so that a solar water evaporation and adsorption material formed by pre-oxidized nanocellulose and polyvinyl alcohol and loaded with the polydopamine modified zeolitic imidazolate framework material is obtained. The solar water evaporation and adsorption material has the characteristics of high stability, and simultaneously has photo-thermal conversion function and rare earth ion adsorption activity. Solar radiation can be used to promote water evaporation, accelerate the mass transfer of rare earth ions in the aqueous solution and the combination of the adsorption active sites, so that the adsorption kinetics of the rare earth ions is accelerated, and the solar water evaporation and adsorption material can be used for rare earth wastewater treatment, especially low-concentration rare earth wastewater treatment.

This invention relates to the field of homogenizing agent preparation technology, and discloses a composite VOCs concentration homogenizing agent and its preparation method. The homogenizing agent is mainly composed of powdered activated carbon, steam-activated attapulgite clay, and modified diatomaceous earth, combined with a compound molecular sieve, lubricant, and binder. First, the attapulgite clay is activated at high temperature with saturated steam to obtain modified clay. Then, the diatomaceous earth is modified with phosphonic acid and rapidly composited with nano-ZrO2 and mesoporous silica to obtain modified diatomaceous earth. Subsequently, the powder components are dry-mixed uniformly, water is added to form a mold, and then the product is obtained through step drying and heat preservation curing. This invention constructs an adsorption-slow-release synergistic multi-level porous structure through steam activation to open pores, synergistic modification with phosphonic acid and nano-oxides, and compounding of multi-level porous components. This structure can significantly suppress drastic fluctuations in VOCs concentration, providing a stable and long-lasting homogenization effect, and is suitable for VOCs homogenization treatment under fluctuating industrial waste gas concentration conditions.

The invention discloses preparation of a self-supporting graphene / COFs membrane and application of the self-supporting graphene / COFs membrane in environmental water treatment. A laser direct writing technology is adopted, a pattern of a spatial net structure is designed, graphene is printed on the two faces of a PI film, and the self-supporting graphene film is obtained. And growing COFs layers on both sides of the graphene film by taking the prepared graphene film as a carrier, TPA and TAPB as monomers, acetic acid as a catalyst and dimethyl sulfoxide as a solvent to obtain the graphene / COFs (G / COFs) composite film. The designed G / COFs composite membrane has a spatial mesoporous structure, and has efficient adsorption performance on organic pollutants and biomacromolecules in environmental water. The preparation method is simple, the preparation speed is high, the self-supporting property is good, the adsorbent can be repeatedly used, and the adsorbent has good adsorption performance. As a novel material, the G / COFs membrane composite material further promotes the development of the fields of filtration separation, conductivity, sensing, storage and the like.

The application discloses a kind of multilayer biomass cellulose adsorption materials and its preparation method and application, belong to biomass material and sewage treatment technical field.The application first obtains PEI-cellulose by polyethyleneimine modification to biomass cellulose;Then PEI-cellulose and chitosan are crosslinked to prepare surface layer adsorption liquid;While unmodified biomass cellulose and polyvinyl alcohol are mixed to prepare middle layer adsorption liquid;Finally, by layer liquid nitrogen freeze forming, freeze drying and alkali washing treatment, obtain the biomass cellulose adsorption material with sandwich multilayer structure.The multilayer adsorption material prepared by the application has positive electricity on outer layer, can be efficiently adsorbed by electrostatic effect in water with negative electricity micro / nano plastic;Middle layer is neutral, can be used to adsorb organic pollutants carried by micro / nano plastic.The material of the application is low in cost, simple in preparation process, fast in adsorption rate, high in removal rate and reusable, and has good application prospect in water treatment field.

The application provides a preparation method of a core-shell structure molecular imprinting type titanium dioxide material and application of the material in fluoxetine contaminated water remediation, the inner core of the material is a nanometer sphere of anatase type titanium dioxide, and the outer layer is wrapped with a molecular imprinting titanium dioxide layer. The outer layer is constructed by using a molecular imprinting technology with fluoxetine as a template molecule to form specific adsorption sites for target molecules. The inner core is prepared by using a sol-gel method, tetrabutyl titanate is used as a precursor, and the nanometer sphere size is controlled by using n-valeric acid in a mixed solvent to obtain a uniform inner core. The outer layer loading is also based on a sol-gel process, the inner core, a template molecule fluoxetine and a titanium source are ultrasonically dispersed and stirred in a mixed solvent for reaction, and then the template molecule is removed. The prepared material can be used for removing fluoxetine in water: adsorption treatment is carried out in dark conditions, then the photocatalysis effect is utilized under light to degrade the psychoactive drug pollutants, and efficient removal is realized.

The present application relates to the technical field of chlorine-containing electronic wastewater treatment, and particularly relates to an electrolytic adsorption device and application thereof.The present application provides an electrolytic adsorption device, comprising anodes and cathodes arranged alternately and in parallel; the anode comprises an anode substrate and an anode material coated on the surface of the anode substrate; the anode substrate comprises a titanium foil and a titanium dioxide nanotube layer on the surface of the titanium foil, and the titanium dioxide nanotube layer is a three-dimensional array structure; the anode material is a composite material of SnO2, Sb and RuO2; the cathode comprises a cathode substrate and a cathode material coated on the surface of the cathode substrate, and the cathode material is a mixture comprising a carbon-based material and ferroferric oxide. The electrolytic adsorption device has low cost, does not have strict requirements on the treatment conditions of chlorine-containing electronic wastewater, and can effectively remove COD and / or has a relatively high heavy metal (Cu 2+ ) recovery rate.

The invention discloses a method for adsorption and covalent grafting of guest molecules in a two-dimensional porous covalent organic framework film and the guest molecule modified two-dimensional porous covalent organic framework film, relates to the technical field of covalent organic frameworks, and discloses a method for adsorption and covalent grafting of guest molecules in the two-dimensional porous covalent organic framework film. Comprising the following steps: providing a metal substrate, and depositing precursor molecules of a two-dimensional porous covalent organic framework on the metal substrate; heating the precursor molecules deposited on the metal substrate to prepare a two-dimensional porous covalent organic framework film; depositing guest molecules on the two-dimensional porous covalent organic framework film, and performing heating and annealing treatment to obtain the guest molecule modified two-dimensional porous covalent organic framework film. According to the application, the grafting and adsorption of the guest molecules by the two-dimensional porous covalent organic framework film are realized.

The present application relates to industrial wastewater denitrification technical field, specifically, it is a kind of industrial wastewater advanced denitrification method based on graphene adsorption material, it includes the following steps: the industrial wastewater containing total nitrogen is introduced into adsorption reaction unit;By adjusting empty bed contact time, ammonia nitrogen and nitrate nitrogen in wastewater are removed;When adsorption material reaches saturation, regeneration is carried out to particle, and regeneration liquid is collected for nitrogen resource utilization.In the present application, the core-shell type dual-functional graphene adsorption particle is rich in amine group function on the inner core PEI chain, which can efficiently and specifically remove ammonia nitrogen by ion exchange, and the outer shell is composed of in-situ grown magnesium-aluminum hydrotalcite, the exchangeable anions between hydrotalcite layers can be ion exchanged with nitrate nitrogen to realize selective adsorption of nitrate nitrogen;The simultaneous advanced removal of ammonia nitrogen and nitrate nitrogen in industrial wastewater is realized, which greatly improves the treatment efficiency and simplifies the process.

This invention discloses a nano-bimetallic multi-shell hollow oxide, its preparation method, and its applications. Using divalent manganese nitrate, divalent nickel nitrate, and organic ligands as raw materials, a nano-shell hollow oxide is prepared through heating reaction and oxidative calcination. Containing two components, manganese and nickel oxides, the nanomaterial has a rough surface, strong ultraviolet absorption capacity, and good crystal structure, enabling selective adsorption of small-molecule metabolites in complex biofluids. It also efficiently absorbs laser energy from an ion source and transfers it to the metabolites, promoting efficient ionization. Based on this nanomaterial, this invention utilizes laser desorption / ionization mass spectrometry (LDI-MS) to extract metabolic fingerprints of biofluid metabolites from membranous nephropathy patients. Furthermore, a machine learning model is used to screen metabolic markers in serum and urine of patients with membranous nephropathy. This nanomaterial shows promising application prospects as a matrix for LDI-MS analysis of complex biofluids.