354 results about "Colloidal Solution" patented technology

The invention relates to the technical field of biological medicine, and particularly discloses an atopic dermatitis treatment medicine and a preparation method and application thereof.The preparation method comprises the steps that sodium alginate, sodium polyacrylate and water are mixed and then subjected to a swelling reaction, and a colloidal solution with the viscosity larger than or equal to 5000 cP is formed; mixing upatinib, a preservative, glycerol and azone to obtain a raw material phase; and mixing the colloidal solution with the raw materials, and homogenizing to obtain the atopic dermatitis treatment medicine. Through swelling reaction of sodium alginate and sodium polyacrylate, the viscosity of a colloidal solution is remarkably improved through molecular chain entanglement, charge repulsion and water absorption synergistic effects of sodium alginate and sodium polyacrylate; through compounding of all the components, the transdermal efficiency of the medicine is improved, the irritation of the medicine is reduced, and meanwhile, the inhibition efficiency on atopic dermatitis inflammatory factors is also improved.

The invention discloses carbon-coated ferric sodium pyrophosphate as well as a preparation method and application thereof. The preparation method of the carbon-coated ferric sodium pyrophosphate comprises the following steps: 1) adding a phosphorus source, an iron source and a sodium source into an aqueous solution to obtain a mixed solution; dispersing a conductive agent into the mixed solution to obtain dispersion liquid; carrying out spray drying on the dispersion liquid to obtain a ferric sodium pyrophosphate precursor containing the conductive agent; 2) dissolving chitosan in an acetic acid aqueous solution to obtain a chitosan colloidal solution; then adding feather keratin into the chitosan colloidal solution, heating and stirring until the feather keratin is uniformly dispersed to obtain a dispersion liquid of double carbon sources; adding a conductive agent-containing ferric pyrophosphate sodium precursor into the double-carbon-source dispersion liquid, uniformly stirring and mixing, and heating and evaporating to dryness to obtain a carbon source-coated ferric pyrophosphate sodium precursor; and 3) carrying out heat treatment on the carbon source-coated ferric pyrophosphate sodium precursor in an inert atmosphere to obtain carbon-coated ferric pyrophosphate sodium.

The invention belongs to the technical field of membrane separation, and discloses an organic metal armored MXene membrane and preparation and application thereof.The preparation method comprises the steps that S1, lithium salt and an acid solution are mixed, a three-dimensional layered MAX raw material is added, stirring, centrifugal washing, ultrasonic treatment and centrifugation are conducted, and a two-dimensional MXene nanosheet dispersion liquid is obtained; and S2, adding an organic metal salt into the two-dimensional MXene nanosheet dispersion liquid, carrying out stirring reaction to carry out organic metal salt modification on MXene nanosheets, and carrying out vacuum filtration or blade coating or spin coating on a porous substrate with a modified MXene nanosheet colloidal solution to obtain the organic metal armored MXene film. MXene is modified through organic metal, interaction between solvent molecules and the MXene membrane is weakened and interlayer spacing and solvent mass transfer behavior are regulated and controlled by means of stable combination of the organic metal and the MXene, so that separation performance and swelling resistance are remarkably improved, and the technical problems that a traditional MXene membrane material is large in swelling and mass transfer resistance, low in separation efficiency and the like are solved.

The invention belongs to the technical field of temperature sensors, and particularly relates to a wide-range temperature sensor and a preparation method thereof. The method comprises the following specific steps: S1, transferring 1-50 ml of a SnO2 nanoparticle colloidal solution into a reaction container; dissolving 1, 4-benzene dithiol in ethanol to obtain a mixed solution, adding 100 [mu] l of the mixed solution into the reaction container to be mixed with the nanoparticle colloidal solution, and incubating in a water bath environment to form a modified compound; s2, sequentially centrifuging and washing the formed modified compound, and then dispersing the modified compound in 1mL of ethanol to obtain a modified SnO2 nanoparticle modification solution; and S3, dispensing the SnO2 nano-particle modification solution on a substrate with two electrodes to form a SnO2 nano-particle modification layer, and connecting the SnO2 nano-particle modification layer to a signal acquisition circuit through the electrodes to prepare the temperature sensor. The temperature sensor based on the SnO2 nano material modified by 1, 4-benzene dithiol can be suitable for monitoring in a wide temperature range.

An electrophoresis display with improved micro partition structure includes a control substrate having a first face and a second face, a driving circuit layer, a control electrode layer, and an electrophoresis layer. The driving circuit layer, the control electrode layer, and the electrophoresis layer are sequentially arranged on the second face. The electrophoresis layer includes a micro partition structure arranged on the control substrate and made from polymer material. The micro partition structure includes a plurality of partition walls to define chambers for accommodating a colloidal solution. The height of the partition wall of the micro partition structure is smaller than 25 μm.

The invention discloses a preparation method of a heat-insulating ionic adhesive film and safety glass thereof, and belongs to the technical field of glass preparation. The preparation method comprises the following steps: S1, stirring and mixing Cu (NO3) 2.3 H2O and ionic liquid to obtain a blue colloidal solution; s2, reacting the blue colloidal solution in a reaction kettle, collecting a nano CuS product, and dispersing the nano CuS product in deionized water to obtain flaky nano CuS; s3, a silane coupling agent is dissolved in absolute ethyl alcohol and stirred, a mixed solution is obtained, nano CuS is added into the mixed solution, magnetic stirring is conducted, and then ultrasonic treatment is conducted; s4, blending the solution subjected to ultrasonic treatment with SGP resin, and then taking out and drying to obtain a blend; and S5, extruding the blend into a sheet by using a parallel twin-screw extruder, and pressing and shaping the extruded sheet by using a conveyor belt tractor to obtain the adhesive film. The oxygen vacancy modified CuS improves the photocatalysis, antibacterial or ultraviolet shielding performance and is suitable for building or automobile glass, and the SGP resin matrix has high transparency, weather resistance and flexibility and is suitable for laminated safety glass.

The invention provides a carbon-supported platinum-cobalt-copper multifunctional alloy catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. Wherein the nanocarbon carrier solution is mixed with a chloroplatinic acid solution, a cobalt chloride solution and a copper chloride solution, a sodium hydroxide aqueous solution is added to adjust the pH value, ultrasonic dispersion and stirring are performed to obtain turbid liquid, and the molar ratio of platinum ions to cobalt ions to copper ions is 2: (0.5-1): (0.5-1); then, putting the turbid liquid into a reaction kettle, and reacting at 120-250 DEG C for 1-6 hours to obtain a black colloidal solution; then filtering, washing and drying the black colloidal solution to obtain black powder; and finally, carrying out acid treatment on the black powder, and grinding to obtain the carbon-loaded platinum-cobalt-copper multifunctional alloy catalyst. The catalyst is used for catalyzing an oxygen reduction reaction of a cathode in a hydrogen fuel cell and / or a methanol fuel cell, and / or catalyzing a methanol oxidation reaction of an anode in a direct methanol fuel cell.

The invention relates to the technical field of seed coating materials, and discloses a wheat and rice seed coating material and a coating process. The wheat and rice seed coating material comprises micron iron powder, nano calcium phosphate, nano magnesium hydroxide and a binder, the addition amounts of the micron iron powder, the nano calcium phosphate and the nano magnesium hydroxide respectively account for 10%-20%, 2%-10% and 3%-10% of the total weight of the seeds; the binder is at least one of a polyvinyl alcohol colloidal solution, a carboxymethyl cellulose colloidal solution and a hydroxypropyl methyl cellulose colloidal solution. The invention also provides a coating process of the wheat and rice seed coating material. The coating material disclosed by the invention not only can protect seeds, but also can efficiently adsorb and fix heavy metal ions of lead, cadmium and arsenic after the micron iron powder, the nano calcium phosphate and the nano magnesium hydroxide are slowly released in soil, so that integrated prevention and control from'seeds' to'rhizosphere 'is realized.

The invention relates to the field of oilfield drilling, and particularly discloses a salt-resistant thickening agent for fracturing and a preparation process thereof, and the preparation process comprises the following steps: firstly performing intercalation modification on bentonite, and then performing mixed modification treatment on PAMAM, acrylic acid and sodium vinylsulfonate to obtain sulfonated bentonite; the preparation method comprises the following steps: taking acryloyloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide and allyl polyoxyethylene ether as basic monomers to prepare a basic monomer mixed solution; and adding sulfonated bentonite into the basic monomer mixed solution, stirring, reacting and preserving heat under the protection of inert gas and the action of an initiator to obtain a colloidal solution, and drying to obtain the salt-resistant thickening agent. The invention further discloses the salt-resistant thickening agent for fracturing, which is prepared by adopting the preparation process. The preparation method has the characteristic that the thickening agent which is good in salt resistance and can still keep excellent shear stability under a high-temperature condition is prepared.

The application discloses a N2O decomposition catalyst taking waste and old rare earth-based denitration catalyst as raw material and a preparation method thereof, and the catalyst is prepared from the waste and old rare earth-based denitration catalyst, diatomite and kaolin as a N2O decomposition catalyst carrier, and a nickel-lanthanum composite oxide (NiLaO x ) as a catalytically active component. The waste and old rare earth-based denitration catalyst, diatomite and kaolin are prepared into the carrier through crushing, batching and calcining processes, a nickel-lanthanum composite oxide precursor is configured into a colloidal solution, then the carrier is immersed in the nickel-lanthanum composite oxide precursor colloidal solution, and the N2O decomposition catalyst is obtained through drying and calcining. The catalyst not only realizes harmless disposal of the waste and old rare earth-based denitration catalyst, but also uses the waste and old rare earth-based denitration catalyst as a high-value resource for N2O decomposition, and the catalyst has high N2O decomposition activity and strong stability.

The invention discloses a method for preparing a high-suspension easily-dispersed nano cerium oxide solution with the assistance of ammonium chloride, and relates to the technical field of nano material preparation, and the preparation process comprises the following steps: (1) preparing a cerium nitrate solution; (2) preparing a mixed solution; (3) preparing a colloidal solution; (4) aging treatment; (5) preparing a precursor; (6) calcining the precursor; and (7) sanding the slurry. Compared with the prior art, the nano cerium oxide solution has the characteristics of simple and stable preparation process, low requirement on equipment, fewer types of raw materials, high purity of the obtained product, uniform particle size distribution, good particle dispersity, no need of addition of any auxiliary agent and the like, and the prepared nano cerium oxide solution is suitable for ultra-precise polishing and grinding of liquid crystal displays, optical elements, AR glasses and electrical and electronic equipment.

The invention belongs to the technical field of aluminum electrolysis inert anode materials, and particularly relates to a surface target-free activation process and a surface chemical plating process of ferronickel spinel powder. The surface target-free activation process of the ferronickel spinel powder comprises the following steps: carrying out reaction on NiFe2O4 powder, nickel salt and hydroxide in a solvent to form a colloidal solution, carrying out solid-liquid separation, and drying to obtain Ni (OH) 2-coated NiFe2O4 powder; and calcining the obtained Ni (OH) 2-coated NiFe2O4 powder to obtain NiO-coated NiFe2O4 powder, and then carrying out a reduction reaction to obtain NiFe2O4 particles with nano Ni particles distributed on the surfaces of the NiO-coated NiFe2O4 powder. Nanoscale active Ni particles are formed on the surfaces of NiFe2O4 particles through a chemical bath precipitation method, calcination and reduction, replace palladium to become a surface activation center and are uniformly distributed, and a continuous and complete metal coating can be formed on the surface of powder during chemical plating.

An electrophoretic display with aligned microcell structure, comprising: a control substrate having a first surface and a second surface; a drive circuit layer, a control electrode layer, an electrophoretic layer, the drive circuit layer, the control electrode layer, the electrophoretic layer are sequentially arranged on the second surface of the control substrate; the electrophoretic layer has a microcell structure arranged above the control substrate and made of a polymer material, the microcell structure comprises a plurality of cell walls for defining a plurality of chambers filled with a colloidal solution, and the overlapping area of the cell walls and the control electrode in the projection direction of the viewing surface is less than 50% of the area of the control electrode.

The present application relates to a controllable preparation method of a colloidal crystal capillary column and its application in biomolecule separation, and specifically comprises the following steps: a plunger and an electroosmotic pump are prepared in situ at one end of a capillary; a buffer solution containing monodisperse colloidal particles is filled in an upper reservoir of an electric field assembly device, and a buffer solution is filled in a lower reservoir; the capillary is filled with the buffer solution, and the end of the capillary containing the electroosmotic pump is inserted into the lower reservoir; the dispersion of the colloidal solution is maintained by applying oscillation to the upper reservoir, an electric field is applied between the two reservoirs to make the colloidal particles move to the electroosmotic pump under the action of an electroosmotic flow, and a three-dimensional colloidal crystal is assembled; and the capillary is supplemented with an ultrasonic force to reduce lattice defects. The present application has the advantages of simple preparation process, controlled directional movement of colloidal particles through an electric field, improved assembly efficiency and quality of the three-dimensional colloidal crystal, and controllable assembly of the colloidal particles under the action of an electric field through regulation and control of the length and surface charge of the electroosmotic pump.

Provided are a method for producing microparticles capable of improving the purity of microparticles, and a colloidal solution. A method for generating microparticles using a femtosecond pulse laser includes an irradiation step of irradiating a powder material 5 in a solvent 6 with a femtosecond pulse laser to generate microparticles containing a metal atom, in which the powder material 5 has a mid-diameter larger than that of the microparticle and contains the metal atom. For example, the powder material 5 includes a first powder material containing a first metal atom and a second powder material containing a second metal atom different from the first metal atom, and the microparticle is an alloy containing the first metal atom and the second metal atom.

This invention discloses a TiC-Ti3C2T x The preparation method of MXene composite material includes: acid etching of Ti3AlC2 ceramic powder, washing of etching products, centrifugation, and ultrasonic layering to obtain single-layer and few-layer Ti3C2T. x Colloidal solution, then freeze-dried to obtain monolayer and few-layer Ti3C2T x Powder; TiC powder, dried Ti3C2T x TiC-Ti3C2T was prepared by high-shear emulsification and mixing of powder and polytetrafluoroethylene dissolved in anhydrous ethanol, followed by rotary evaporation, drying, and spark plasma sintering. x MXene composite material. This invention solves the problem of reinforcement dispersion in TiC ceramic matrix and addresses the issue of Ti3C2T under high-temperature sintering conditions. x The MXene phase transformation and oxidation problems are addressed, and the TiC matrix is ​​strengthened and toughened by inducing matrix grain refinement, crack deflection, crack bridging, and lamellar pull-out, thereby improving bending strength and fracture toughness.

The preparation method of the high-temperature-creep-resistant nano-composite pressure vessel steel comprises the following steps that a lead sulfide precursor is dissolved in an organic solvent, and heating reaction is conducted under the inert gas condition to generate lead sulfide quantum dots; mixing quantum dots with amphiphilic molecules, and performing ultrasonic emulsification to form a quantum dot colloidal solution; mixing the quantum dot colloidal solution with supercritical carbon dioxide to form a homogeneous fluid phase; the steel matrix is placed in a high-pressure reaction kettle, the homogeneous fluid phase is introduced, permeation is conducted for 2-4 h under the conditions that the pressure is 10-15 MPa and the temperature is 50-70 DEG C, and a steel billet is obtained; the steel billet is placed in hot isostatic pressing equipment, heat preservation and pressure maintaining are conducted for 1-2 h in the inert gas environment under the conditions that the pressure ranges from 150 MPa to 200 MPa and the temperature ranges from 800 DEG C to 900 DEG C, and then the steel billet is cooled to the room temperature; semiconductor quantum dots are introduced into a metal matrix, atomic-scale interface strengthening is achieved through the quantum effect and the supercritical fluid permeation technology, and the steady-state creep rate of the material at the temperature of 600 DEG C can be reduced to 1 / 10 of that of a traditional process by combining the microcosmic strengthening advantage of the quantum dots and the macroscopic permeation advantage of supercritical fluid.

The invention relates to the technical field of nano composite materials, in particular to a composite aerogel material as well as a preparation method and application thereof. The preparation method comprises the following steps: providing an MXene solution and a polypropylene nanofiber colloidal solution; mixing the MXene solution and the polypropylene nanofiber colloidal solution to obtain a first mixed solution; performing freeze thawing treatment on the first mixed solution for multiple times to obtain composite nanofiber colloid hydrogel; the composite nanofiber colloid hydrogel is subjected to freeze drying, and composite nanofiber colloid aerogel is obtained; and immersing the composite nanofiber colloid aerogel into a solution containing polysiloxane, and then sequentially carrying out curing and ceramic treatment to obtain the composite aerogel material. The prepared composite aerogel material has heat insulation and compressibility, and is expected to be applied to the fields of flexible wearable electronics, energy and environment.

The invention provides a preparation method for improving the solid content of a glue solution in the production process of a catalytic cracking catalyst, and belongs to the technical field of catalytic cracking catalyst preparation. According to the method, the mixing sequence of a silicon source and an aluminum source is optimized, the pH value and temperature of a reaction system are controlled, and a composite dispersing aid is introduced, so that the problems of difficulty in subsequent catalyst forming, unstable activity and the like caused by low solid content of a glue solution in a traditional preparation process are solved. The method is characterized by comprising the steps of (1) preparing an aluminum source solution, (2) preparing a silicon source dispersion liquid and (3) preparing a glue solution through a mixed reaction, the solid content of the glue solution can be increased to 38-45%, the glue solution is good in dispersion uniformity and free of obvious agglomeration phenomenon, the abrasion index of the subsequently prepared catalytic cracking catalyst is reduced by 8-12%, the catalytic activity is improved by 5-8%, and the method is suitable for large-scale industrial production.

The present invention relates to the technical field of thickeners, and specifically discloses a novel thickener for oil well fracturing and a preparation method thereof. The preparation method of the novel thickener for oil well fracturing includes: preparing modified hydroxyethyl methacrylate; preparing a gradient-branched polymer solution; preparing a sulfonic acid-boric acid double-modified montmorillonite powder; preparing a colloidal solution; centrifuging, spray-drying, and sieving the colloidal solution to obtain the novel thickener for oil well fracturing. The novel thickener for oil well fracturing prepared by the present invention has the characteristics of temperature resistance, salt resistance, and self-healing performance. In practical applications, it can quickly thicken and carry proppants during the low-temperature pumping stage, trigger the self-healing performance after entering the high-temperature formation, and partially dissociate the dynamic network to reduce the viscosity during backflow, providing a reliable technical support for the development of deep shale gas and tight oil.

The application belongs to the technical field of medical materials, and discloses a hydrogel for graded release of acid and long-acting consumption of alkali as well as a preparation method and application thereof, which comprises the following steps: adding a quaternary ammonium salt chitosan solution into a polyvinyl alcohol-organic acid ester solution, stirring uniformly to obtain a polyvinyl alcohol-organic acid / quaternary ammonium salt chitosan solution; under stirring, adding a nano metal sulfide colloidal solution into the polyvinyl alcohol-organic acid / quaternary ammonium salt chitosan solution, stirring uniformly, and repeatedly freezing and thawing to obtain the hydrogel for graded release of acid and long-acting consumption of alkali after thawing. The application proposes a strategy for graded release of acid and long-acting slow release of alkali, the hydrogel slowly releases acid in application, and the process of long-acting consumption of alkali liquid avoids secondary damage of an acid-alkali reaction to a cornea, so that the hydrogel has a good application prospect in clinical application of corneal alkali burn and opens up a new way for application of H2S in corneal alkali burn.

The invention discloses a method for preparing a ceramic membrane by using surface tension. Relates to the technical field of ceramic membrane preparation. A method for preparing a ceramic membrane comprises the following steps: S1, immersing a grid frame made of a hydrophilic material into a ceramic membrane precursor colloidal solution, lifting the grid frame from the ceramic membrane precursor colloidal solution, and enabling the ceramic membrane precursor colloidal solution to suspend in gaps of grids to form a liquid bridge, so as to obtain a sample; and S2, drying the sample, and when the liquid bridge is converted into a gel state or an amorphous solid film, sintering the sample to obtain the ceramic film. According to the method disclosed by the invention, the ceramic membrane with any required thickness, no crack and excellent piezoelectric coefficient can be manufactured.

A method for producing a gold colloid-labeled antibody suspension, comprising: a labeling step of obtaining a mixture by mixing a gold colloid solution and an antibody solution to obtain a gold colloid-labeled antibody in the mixture; a centrifugation step of centrifugating the mixture to obtain a precipitate of the gold colloid-labeled antibody and removing the supernatant containing antibody that does not have gold colloid adsorbed; and a suspension step of suspending the precipitate of the gold colloid-labeled antibody in a suspension solution containing lactalbumin to obtain a gold colloid-labeled antibody suspension.

The invention relates to a surface-enhanced flexible Raman substrate, a surface-enhanced Raman sensor for nano-plastic trace detection and a preparation method of the surface-enhanced Raman sensor. The preparation method of the surface-enhanced flexible Raman substrate comprises the following steps: preparing a colloidal solution by taking BNCs, a CS solution and a HAuCl4 aqueous solution as raw materials; the preparation method specifically comprises the following steps: dispersing an aqueous solution of HAuCl4 into an aqueous solution of BNCs, adding pvp for physical mixing and stirring, and then adding ethanol to obtain a mixture; and irradiating the mixture with laser, washing with deionized water for three times to obtain a BNCs / AuNWs colloidal solution, dropwise adding a CS solution, stirring, and carrying out suction filtration on the colloidal solution to obtain the BNCs / AuNWs coated CS surface-enhanced Raman scattering substrate. The CS substrate enhances molecular adsorption, so that the adsorption rate of the nano-scale plastic particles is greatly improved, the gold nanoparticles generate an enhanced LSPR effect on the surface of the substrate, a Raman signal is improved by 60-63 times, and the detection efficiency is improved.

The invention discloses reaction equipment for preparing low-sodium aluminum sol, and relates to the technical field of chemical equipment, the reaction equipment comprises a reaction kettle, and the reaction kettle is internally provided with an inner cavity for aluminum sol preparation reaction. The invention further discloses a reaction method of the reaction equipment for preparing the low-sodium aluminum sol. The reaction method comprises the following steps of aluminum sol generation, aluminum sol transfer, product discharge and back flushing. The reaction kettle, the fixed cover and the annular cover are arranged, metal aluminum and hydrochloric acid react in the reaction kettle to generate a colloidal solution of aluminum sol, the colloidal solution of the aluminum sol is in a nano-particle state after generation, and the colloidal solution of the aluminum sol is directly transferred into the annular cover at the moment; the aluminum sol colloidal solution in the nano-particle state passes through the ion exchange column in the annular cover, sodium ions in the aluminum sol colloidal solution are adsorbed and separated by the strong-acid cation exchange resin in the ion exchange column, and therefore the low-sodium aluminum sol can be obtained.

This invention relates to a microwave radiation method for preparing room-temperature phosphorescent polymer films based on polyacrylamide, belonging to the field of organic light-emitting materials. The method involves dissolving acrylamide monomer, ammonium persulfate initiator, and β-diketone ligand in a mixed solvent of water and acetonitrile, placing the solution in a microwave reactor, and polymerizing it under microwave radiation to obtain the polymer. The resulting colloidal solution, dissolved in deionized water, is uniformly coated onto a polytetrafluoroethylene (PTFE) or silicone plate, and dried to obtain the room-temperature phosphorescent polymer film based on polyacrylamide. The prepared polymer film exhibits blue or blue-green fluorescence and a green afterglow. The polymer film containing 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione has an afterglow time of up to 7.5 seconds. The raw materials of this invention are readily available, the preparation method is simple, convenient, and rapid, requiring no inert gas protection, the solvent does not require treatment, polymerization can be completed in minutes, and the obtained material is non-toxic, non-polluting, free of heavy metals and halogens, has good water solubility, and has broad application prospects.

This invention belongs to the field of lithium resource extraction technology, specifically relating to a polypyrrole-coated MXene / lithium iron phosphate composite aerogel material, its preparation method, and its application. The preparation method of the polypyrrole-coated MXene / lithium iron phosphate composite aerogel material of this invention includes the following steps: S1, mixing MXene colloidal solution with lithium iron phosphate powder, stirring and dispersing to obtain mixture A; adding a pyrrole monomer solution to mixture A, stirring to allow the pyrrole monomer to adsorb onto the surfaces of MXene and lithium iron phosphate; S2, adding an initiator solution to the system obtained in step S1 to initiate in-situ polymerization of the pyrrole monomer, forming an MXene / LFP / PPy composite hydrogel; S3, washing and freeze-drying the composite hydrogel. The polypyrrole-coated MXene / lithium iron phosphate composite aerogel material of this invention helps improve lithium extraction efficiency and exhibits good cycle stability.

The present application belongs to the technical field of environmental data analysis, and particularly relates to a method for predicting heavy metal concentration in soil colloid solution based on a machine learning model. Colloid extraction is performed on heavy metal contaminated soil samples, and characteristic variables of the soil colloid solution are determined. The characteristic variables are standardized and coded, and the preprocessed characteristic variables are respectively input into pre-trained machine learning models for predicting the concentrations of As, Cd, Pb and Zn in the soil colloid solution to obtain predicted values corresponding to the heavy metal concentrations. The pre-trained machine learning models for As and Pb are two-stage models, the first stage being a release probability classification model and the second stage being a release amount regression model. The pre-trained machine learning models for Cd and Zn are single-stage regression models. The present application provides a method for predicting heavy metal concentration in soil colloid solution based on a machine learning model, which provides a reliable technical method for accurately predicting heavy metal release characteristics.

The invention discloses a method for preparing porous zirconia ceramic by low-temperature sintering, which comprises the following steps: S1, mixing citric acid, zirconium acetylacetonate and absolute ethyl alcohol according to a certain proportion to obtain a colloidal solution A; s2, mixing inorganic yttrium salt, inorganic zirconium salt and water according to a certain proportion to obtain a mixed solution B; s3, slowly adding the colloidal solution A into the mixed solution B obtained in the step S2; s4, drying the colloidal solution to obtain a dried precursor; s5, carrying out low-temperature calcination on the dried precursor to obtain nano yttrium-stabilized zirconia powder; s6, performing ball milling and spray granulation on the powder to obtain spherical granulation powder with uniform particle size; s7, carrying out dry pressing molding and cold isostatic pressing molding to obtain a to-be-sintered ceramic biscuit; and S8, sintering in a muffle furnace to obtain the final porous zirconia ceramic. After the powder is subjected to ball milling, granulation, dry pressing and cold isostatic pressing, the zirconia ceramic which is uniform in pore diameter and has nano-scale pores is prepared through low-temperature sintering.

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.