303 results about "Coprecipitation" patented technology

The invention discloses a high-specific-surface-area low-sodium-sulfur ternary precursor as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a nickel-cobalt-manganese salt solution, a precipitant and a complexing agent into a first reaction kettle, and carrying out a co-precipitation reaction in an inert atmosphere to obtain a crystal nucleus with the particle size D50 of 1.0-1.6 [mu] m; and adding the crystal nucleus, a nickel-cobalt-manganese salt solution, a precipitator and a complexing agent into a second reaction kettle, carrying out a coprecipitation reaction in an inert atmosphere, then carrying out a coprecipitation reaction in an oxidizing atmosphere, and stopping the reaction when the product granularity D50 is 3.8-4.2 microns to obtain the high-specific-surface-area low-sodium-sulfur ternary precursor. The ternary precursor prepared by the method is narrow in particle size distribution and good in sphericity, primary particles are flaky and grow in the radial direction, secondary particles are porous, the product batch stability is high, and production operation is convenient.

The invention discloses a preparation method of a double-enzyme inorganic functional nanoflower and application of the double-enzyme inorganic functional nanoflower in preparation of a competitive ELISA (enzyme-linked immuno sorbent assay) kit for detecting clonorchiasis sinensis. Belongs to the technical field of clonorchis sinensis detection. The invention provides a preparation method of a double-enzyme-inorganic functional nanoflower composite material, which comprises the following steps: reacting clonorchis sinensis monoclonal antibody, HRP (horse radish peroxidase) and copper phosphate solution at room temperature for 12-48 hours, and coprecipitating to obtain the functional nanoflower composite material. By utilizing the characteristic that the HNFs can catalyze a substrate TMB, species limitation caused by a traditional enzyme-labeled secondary antibody is broken, the detection sensitivity is improved, and multi-host detection of clonorchis sinensis is realized.

The invention discloses a targeted nano delivery system based on curcumin (Cur) and near-infrared aggregation-induced emission (AIE) molecule BDTA and application of the targeted nano delivery system in treatment of glioblastoma (GBM), and belongs to the field of biomedicine. The nano platform is composed of nanoparticles (MPMs (at) Cur-BDTA NPs) modified by a macrophage membrane, curcumin and BDTA are combined by adopting a coprecipitation method, and the targeting property of the nano platform to tumors is enhanced through modification of the macrophage membrane. The nanometer platform combines the functions of photo-thermal therapy (PTT), photodynamic therapy (PDT) and chemotherapy, and can achieve multiple treatment effects. The curcumin improves PTT sensitivity by down-regulating expression of heat shock protein HSP-70 in the platform, and effectively improves photothermal conversion efficiency (87.6%) and singlet oxygen generation amount (1.7 times higher than that of a control group) through a Foster resonance energy transfer (FRET) mechanism. In a glioblastoma in-vitro experiment, the nano platform shows a synergistic treatment effect of photo-thermal, photodynamic and chemotherapy. The invention provides an intelligent treatment platform integrating photo-thermal treatment, photodynamic treatment and chemotherapy, and provides an efficient and safe innovative treatment strategy for precise treatment of glioblastoma.

The invention relates to a preparation method and application of a composite piezoelectric catalytic material NaNbO3-coated BiFeO3 for rapidly degrading antibiotics, NaNbO3 is flaky crystal grains with [001] crystallographic orientation prepared by a two-step molten salt method, and BiFeO3 is micro-nano particles prepared by a coprecipitation method. Composite micro-nano BiFeO3 powder and [001] oriented NaNbO3 flaky grains form a heterojunction, conversion of mechanical energy and electric energy of the material is achieved under the ultrasonic vibration condition, inductive charges are generated on the surface of the material, and photon-generated carriers move reversely under driving of a built-in electric field. According to the invention, the piezoelectric catalytic degradation capability of the BiFeO3 and NaNbO3 composite piezoelectric catalytic materials with different proportions on four antibiotics, namely oxytetracycline, levofloxacin, carbamazepine and paracetamol in different time periods is researched. When the mass ratio of the BiFeO3 to the NaNbO3 composite material is 1: 3, the oxytetracycline degradation rate within 30 min can reach 78.2%, the oxytetracycline degradation rate within 120 min can reach 91.8%, and the piezoelectric electro-catalysis characteristic is rapid and efficient. The method disclosed by the invention has important significance in developing a high-efficiency piezoelectric catalyst for degrading antibiotics.

The invention discloses a wave-absorbing material chemical coprecipitation reaction kettle, and relates to the technical field of chemical engineering equipment and functional material preparation, the reaction kettle comprises the following components: a three-stage gradient reaction cavity structure, an anti-pollution structure and a multi-physics field coupling control platform; through the design of a three-stage gradient reaction cavity structure, optimal distribution of a fluid field is realized, stable and efficient flowing of a reaction solution among different cavities is ensured, a multi-axis intelligent mixing system in a premixing area can quickly mix a precursor solution to achieve a molecular-level mixing state, an ideal initial condition is provided for subsequent reaction, and the reaction efficiency is improved. The nucleation area realizes uniform nucleation of nanocrystal nuclei through accurate temperature control and chemical environment control, the grain size distribution range is effectively reduced, the growth area controls preferred growth of crystal faces through adjustment of magnetic field intensity and solution supersaturation degree, particles with good monodispersity are obtained, and under the combined action of the designs, the particle size distribution range is effectively reduced. The reaction efficiency and the consistency of the product quality are obviously improved.

The invention discloses a magnetic porous microsphere for in-vitro diagnosis and a preparation method of the magnetic porous microsphere, and belongs to the technical field of preparation of micro-nano materials. According to the invention, styrene is used as a polymerization monomer, and a dispersion polymerization method is adopted to prepare monodisperse polystyrene microspheres; ferric chloride and ferrous sulfate are selected as precursors, magnetic nanoparticles are synthesized through a coprecipitation method under the alkaline condition, the initial loading capacity is changed, the magnetic nanoparticles are loaded on the surfaces and in pore channels of polymer porous microspheres through a multi-step seed growth method, and the magnetic nanoparticles are prepared. The composite magnetic polystyrene microspheres with high magnetic content, good magnetic responsiveness and superparamagnetism are synthesized; finally, functional groups are introduced to the surfaces of the magnetic spheres by monomers containing the functional groups through a monomer swelling polymerization method, and the prepared magnetic porous microspheres have the advantages of uniform particle size, small coefficient of variation and large specific surface area, and can be better combined with antigens and antibodies, so that in-vitro diagnostic function detection such as nucleic acid extraction and chemiluminescence is carried out.

The invention discloses an anti-soluble transferrin receptor monoclonal antibody as well as a preparation method and application thereof, and belongs to the technical field of antibody detection. According to the antibody, an L101-F760 amino acid sequence of human TfR protein is used as an immunogen, specific screening of B cells, reverse RNA (Ribonucleic Acid) into cDNA (Complementary Deoxyribose Nucleic Acid) through RT-PCR (Reverse Transcription-Polymerase Chain Reaction), then homologous recombination is performed to construct heavy and light chain vectors, and finally multiple rounds of screening are performed to obtain the purified sTfR monoclonal antibody, so that the sTfR protein can be specifically recognized, and the antibody has the advantages of high specificity and high sensitivity and can be widely applied to the field of immunotherapy. The natural sTfR protein in human serum can be recognized. The kit is applied to the detection and screening fields of immunohistochemistry, immunofluorescence chemistry, western blot, co-immunoprecipitation, indirect ELISA, flow cytometry and the like, especially has low background and no interference of non-specific binding impure protein during immunohistochemistry detection, can obtain more accurate detection and evaluation results, avoids interference of false positive and false negative, and has high detection accuracy. The method has great application value in the aspects of basic scientific research and clinical pathology detection.

The invention discloses a preparation method and application of a modified hydrotalcite-like compound loaded nano zero-valent iron composite material, and relates to the technical field of wastewater treatment. According to the specific technical scheme, the preparation method comprises the following steps: preparing nano silicon dioxide modified hydrotalcite-like compound (SiLDH) by adopting a coprecipitation method; the preparation method comprises the following steps: uniformly mixing SiLDH and a FeSO4. 7H2O solution in an ultrasonic manner, loading nano zero-valent iron (nZVI) on the SiLDH by adopting a NaBH4 reduction method under an anoxic condition, magnetically collecting and washing a black solid after the reaction is completed, and performing surface functionalization modification on the black solid by using glycine to obtain the glycine functionalization modified hydrotalcite loaded nano zero-valent iron composite material (Gly-SiLDH (at) nZVI). SiLDH with a large specific surface area is used as a carrier of nZVI, and glycine functionalization is used as a material surface to introduce an additional active site for adsorbing nitrate, so that the problem that nZVI is easy to agglomerate is solved, secondary pollution caused by metal modification is avoided, and the nitrate removal efficiency is greatly improved.

The embodiment of the invention discloses a wet chemical preparation method of an electrolyte material. The wet chemical preparation method comprises the following steps: providing a halide mother solution and a lithium source solution; slowly adding the lithium source solution into the halide mother solution for coprecipitation to generate a coprecipitation product; evaporating the halide mother liquor and the lithium source solution which do not participate in coprecipitation to crystallize and separate out a coprecipitation product; and carrying out low-temperature sintering on a co-precipitation product separated by crystallization to obtain the electrolyte material. According to the wet chemical preparation method of the electrolyte material, the lithium source solution is slowly added into the halide mother solution, evaporative crystallization and coprecipitation are combined, uniform crystallization of all components can be achieved, and segregation is avoided; and the lithium source solution is slowly added, so that the solution state in the evaporation process can be changed, and the crystal granularity of the product is controllable.

The invention provides a preparation method of petal-shaped Co-Mg-Al-LDH (layered double hydroxides), which comprises the following steps: uniformly mixing polar phase water, non-polar phase ionic liquid and a surfactant to obtain a double-response ionic liquid microemulsion; sequentially adding a cobalt source, a magnesium source, an aluminum source and a precipitator into the double-response type ionic liquid microemulsion to obtain a mixture; the mixture is subjected to a hydrothermal reaction firstly, then washing and drying are carried out, and the petal-shaped Co-Mg-Al-LDH is prepared. The invention further provides the application of the petal-shaped Co-Mg-Al-LDH prepared by the preparation method to degradation of ciprofloxacin in water. The invention solves the technical problems of easy agglomeration, small specific surface area and difficult treatment of antibiotic-containing medical wastewater in the traditional coprecipitation method. According to the invention, the dual-response type ionic liquid microemulsion is used as the microreactor, so that the nucleation and growth of the petal-shaped Co-Mg-Al-LDH nano material are limited; meanwhile, the size, the distribution and the composition of the petal-shaped Co-Mg-Al-LDH nano particles are controlled, and the petal-shaped Co-Mg-Al-LDH with the efficient degradation capacity on the antibiotics in the water body is obtained.

The invention discloses Mn-doped MgAl-LDH particles for sonodynamic therapy as well as preparation and application. The Mn-doped MgAl-LDH particles are synthesized through a chemical coprecipitation method, Mn ion doping under the protection of N2 and hydrothermal treatment. Wherein trace doping of Mn ions in an LDH structure causes an appropriate energy band structure, so that effective separation of electrons and holes under ultrasonic irradiation is promoted, and generation of ROS is promoted. The Mn-doped MgAl-LDH particles prepared by the preparation method disclosed by the invention show excellent SDT performance, can effectively inhibit the growth of tumors, and show good biocompatibility. Therefore, the innovative design of the invention opens up a potential path for exploring a novel sound-sensitive agent in effective ultrasonic catalytic tumor treatment.

The invention discloses a process method for preparing high-spinning nano pyrite through physical field-chemical method coupling regulation and control, which comprises the following steps: dissolving bovine serum albumin in deionized water, adding an iron source, uniformly mixing, adjusting the pH value of the solution to 10.0-11.0, adding a sulfur source, and uniformly mixing, thereby obtaining the high-spinning nano pyrite. Carrying out a coupling regulation reaction of a physical field and a chemical method on the reaction system under the protection of inert gas, and then dialyzing and purifying to prepare the high-spin-state FeS2 nanosheet. The chemical method comprises one or more of a coprecipitation method, a solvothermal method and a hydrothermal method; the physical field comprises one or more of an alternating magnetic field, a static magnetic field and a rotating magnetic field. Through coupling regulation and control of a physical field and a chemical method, accurate conversion of the FeS2 nanosheet from a low spinning state to a high spinning state is realized, chemical doping can be effectively avoided, natural biological suitability of FeS2 is reserved, and the method has a good clinical conversion application prospect.

The invention discloses a magnetic biochar coupled dynamic membrane synergistic pollution reduction and flora regulation method, which comprises the following steps: adding magnetic biochar into an anaerobic dynamic membrane bioreactor for anaerobic digestion reaction, and adding 1.2-1.5 g of magnetic biochar into each liter of sludge mixed liquid in the anaerobic dynamic membrane bioreactor. The magnetic biochar is composed of a honeycomb-shaped carbon material obtained by pyrolyzing carbon through sodium citrate and Fe3O4 loaded on the surface of the honeycomb-shaped carbon material through a chemical coprecipitation method. According to the method, functional microorganisms such as methane filamentous bacteria and methane rod bacteria can be selectively enriched, the methane yield is increased by 30%-35%, membrane pollution is effectively relieved by improving the sludge floc structure, the service life of the membrane is prolonged, and technical support is provided for low-cost and low-energy-consumption operation of the anaerobic membrane bioreactor.

The invention relates to the field of microorganisms, in particular to cucumber Chryseobacterium G1 and application thereof. The cucumber Chryseobacterium sp. G1 is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.32659, and the preservation date is November 15, 2024; according to the present invention, the suggested classification name is Chryseobacterium cucumerii, and the preservation number is CGMCC (China General Microbiological Culture Collection Center); by adding calcium ions, the cadmium resistance of the cucumber Chryseobacterium G1 is enhanced, the tolerance concentration is increased from 20 mg / L to 120 mg / L, co-precipitation of cadmium carbonate and calcium carbonate is promoted, and the stability is improved; chicken manure is used for providing a nitrogen source and organic matters, and meanwhile, the activation effect of the chicken manure on cadmium is blocked through the ammoniation effect of cucumber Chryseobacterium G1.

The present application provides a ternary precursor of a core-shell structure, and a preparation method therefor and a use thereof. The preparation method for the ternary precursor comprises the following steps: introducing, in a concurrent flow, a ternary mixed salt solution, a precipitant solution and a complexing agent solution into a base solution, and carrying out a coprecipitation reaction until a target particle size, so as to obtain the ternary precursor of a core-shell structure, wherein the base solution comprises a metal-doped molecular sieve material. The ternary precursor of the core-shell structure obtained by the preparation method provided in the present application has a nickel-rich core and a manganese-rich shell, and a positive electrode material prepared from the ternary precursor has good rate performance and cycle performance and high initial specific capacity. In addition, the preparation method provided in the present application involves simple process steps, and does not need complex steps such as secondary sintering or secondary coating, thereby facilitating industrial popularization.

The invention belongs to the technical field of adsorbents, and discloses a core-shell structure composite material as well as a preparation method and application thereof. Ferroferric oxide is loaded on biochar by coprecipitation of ferric salt, ferrous salt and biochar, amination modification is performed by using polyethyleneimine, and a COF shell layer is prepared in situ by using a magnetic core. The shell layer is chemically connected with the magnetic core, and is coated by the COF shell, so that the structural stability is improved, the porous structure of the biochar is not easy to collapse, and the magnetic particles are not easy to fall off; the shell contains sulfonic acid groups, has electronegativity, and is combined with metal ions through electrostatic interaction, so that the adsorption sites of the adsorbent are increased. Meanwhile, the COF shell is of a porous structure, the specific surface area is large, the COF shell has the adsorption effect on metal ions, more adsorption sites are provided for the metal ions through the multiple adsorption effects of the COF shell and the magnetic core, and the removal rate is effectively increased.

The invention provides a composite modified ternary precursor and a preparation method and application thereof.The preparation method comprises the following steps that a nickel-cobalt-manganese ternary mixed salt solution, a precipitator solution, a boron source solution and a complexing agent are injected into a base solution in a parallel flow mode for a first coprecipitation reaction, and a first precursor is obtained; stopping injecting the nickel-cobalt-manganese ternary mixed salt solution, continuously injecting the precipitant solution, the boron source solution and the complexing agent, and carrying out a second coprecipitation reaction to obtain a composite modified ternary precursor; wherein the flow rate of the boron source solution is gradually increased at the speed of 0.02 L / h to 0.2 L / h. According to the invention, the boron gradient doped and coated composite modified ternary precursor is prepared by adjusting the feeding type and the doping mode in the coprecipitation process, so that the structural stability of the precursor can be improved, and the capacity and the cycle stability of the ternary material can be improved.

The invention relates to a preparation method of a multifunctional nano growth-promoting bacterium for overcoming successive cropping obstacles, which comprises the following steps: converting bacillus subtilis into bacillus subtilis spores under the condition of heating or inoculating bacillus subtilis into a sporulation culture medium containing manganese sulfate, preparing iron nanoparticles by using a chemical reducing agent and a coprecipitation method under the protection of inert gas, and carrying out vacuum drying on the iron nanoparticles to obtain the multifunctional nano growth-promoting bacterium for overcoming successive cropping obstacles. The preparation method is simple, the cost is low, the production process is green and environment-friendly and suitable for large-scale production, the prepared nano growth-promoting bacteria can integrate the biological functions of the iron nanoparticles and the bacillus subtilis, the soil fertility is improved, trace elements are supplemented, and meanwhile the biological functions of the iron nanoparticles and the bacillus subtilis are improved. The fertilizer promotes proliferation of beneficial bacteria, inhibits proliferation of harmful bacteria, improves the utilization rate of nutrients, degrades harmful substances, improves stress resistance of crops, realizes dual promotion of soil improvement and crop growth, and has remarkable social and economic benefits.

The invention discloses an RNA fragment extraction method, and relates to the technical field of molecular biology. Comprising the following steps: S1, preparing materials; s2, cell culture: S21, cell resuscitation; s22, performing cell cryopreservation; s23, carrying out cell passage; s3, co-immunoprecipitation, specifically comprising the following steps: S31, binding an antibody to a protein A / G magnetic bead; s32, carrying out cross-linking combination on the antibody; s33, carrying out cell lysis treatment; s34, carrying out manual antigen immunoprecipitation; s4, carrying out RNA extraction on the basis of a TRIZOL method; and S5, carrying out reverse transcription and real-time fluorescent quantitative PCR. By improving the components of the lysis solution and the washing solution, the extraction efficiency and the yield of RNA are improved, and meanwhile, the pollution of impurities is reduced; the usage amount of reagents and experiment steps are reduced, and the experiment cost is reduced.

The present invention belongs to the field of nano drug preparations, and discloses a multifunctional nanozyme platform and its preparation method and application, which is mainly composed of nanozymes, carrier materials and targeting substances. The synthesis of nanozymes, the loading of nanozymes on carrier materials and the modification of their surface targeting substances are carried out by methods such as stirring synthesis, coprecipitation, strong acid oxidation, chemical reduction, covalent bonding, solvent thermal method, physical adsorption, etc. The targeting substance on the surface of the nanozyme platform can be accurately and efficiently positioned to the inflammation site, and the acidic microenvironment of the inflammation site causes the targeting substance and the carrier material to undergo structural depolymerization, thereby releasing a variety of nanozymes, which not only realize the self-cascade and synergistic catalytic enhancement of enzymes at the inflammation site, but also form a substrate self-circulation catalytic system, thereby achieving the effect of efficiently alleviating and treating various inflammation-related diseases.

The invention discloses a sewage treatment agent and a preparation method thereof, and relates to the field of sewage treatment. When the sewage treatment agent is prepared, firstly, clay and a mixed ferric salt solution are mixed, coprecipitation is performed under the action of sodium hydroxide, and then porous magnetic ceramsite is prepared through high-temperature calcination; secondly, polymerization of methyl acrylate on the surface and in pores of the porous magnetic ceramsite is initiated by heat, polymerization of acrylamide on the surface of the porous magnetic ceramsite is initiated by light, and modified porous magnetic ceramsite is prepared; finally, 2, 6-diaminonaphthalene and 1, 3, 6, 8-tetra (4-formylphenyl) perylene are polymerized on the surface of the modified porous magnetic ceramsite, and then the sewage treatment agent is obtained through alkaline hydrolysis. The sewage treatment agent prepared by the invention has good adsorption performance and photocatalytic degradation performance.

The invention aims to provide a polycitrate composite porous bone scaffold and a preparation method, and relates to the technical field of medical instruments, citric acid and 1, 8 octylene glycol are subjected to thermal polymerization crosslinking at high temperature to prepare polycitrate, PCL is added, esterification reaction is performed to synthesize polycaprolactone-citrate (POCL), and the polycaprolactone-citrate (POCL) composite porous bone scaffold is prepared. Then respectively grafting ALN and RSV-loaded calcium carbonate microspheres prepared by a calcium chloride dihydrate and ammonium bicarbonate coprecipitation method on the POCL support by adopting a covalent binding mode; the calcium carbonate microspheres loaded with the RSV are successfully prepared, the microspheres can be degraded in an acid environment and release the RSV, the novel poly-citrate porous bone scaffold loaded with the ALN and the RSV microspheres is successfully constructed, the scaffold has good mechanical properties, hydrophilicity and stability, the acid environment of degradation products of the poly-citrate scaffold can be effectively improved, and the stability of the poly-citrate porous bone scaffold is improved. Meanwhile, the scaffold has good biocompatibility, can promote proliferation of the BMSCs, and has an osteogenic induction effect, so that bone repair is promoted.

This invention discloses a quaternary ammonium salt / magnetic biochar composite material, its preparation method, and its application. Rice husk-based biochar is prepared using agricultural waste as raw material. Magnetic iron-based biochar is synthesized through an alkaline chemical co-precipitation method. Then, it is combined with quaternary ammonium salt compounds via ion exchange to form a quaternary ammonium salt / magnetic biochar composite material. The obtained composite material exhibits significant bactericidal effects and superior slow-release quaternary ammonium salt performance. Furthermore, the used quaternary ammonium salt / magnetic biochar composite material can be used to prepare a regenerated quaternary ammonium salt / magnetic biochar composite material, with better bactericidal effects than the initial use, achieving the recycling and reuse of the composite material. The preparation method of this invention uses widely available and inexpensive raw materials. The obtained composite material adsorbs free bacteria through high-density charge adsorption, avoiding the development of drug resistance and secondary environmental pollution. It can be applied to wastewater treatment, providing a new material and method for solving the problem of pathogenic bacteria pollution in water bodies.

The invention provides a precursor containing primary particles distributed in the radial direction and a preparation method and application thereof.The preparation method comprises the steps that a mixed metal source solution, a complexing agent solution and a precipitator solution are subjected to a first coprecipitation reaction, and a core is obtained; in oxygen-free protective gas, increasing the flow of the mixed metal source solution, the complexing agent solution and the precipitator solution, and carrying out second coprecipitation reaction to obtain a core coated with a compact layer; in an oxygen-containing atmosphere, introducing the mixed metal source solution, the complexing agent solution, the precipitator solution and the doped metal source solution, and carrying out a third co-precipitation reaction to obtain a precursor; the pH and complexing agent concentration of the third co-precipitation reaction are smaller than those of the second co-precipitation reaction and are smaller than those of the first co-precipitation reaction. According to the preparation method, the precursor comprises the primary particles distributed along the radial direction by regulating and controlling the conditions of the coprecipitation reaction at each stage, so that the performances such as circulation and rate of the positive electrode material are improved.

The application belongs to the technical field of gas sensing material preparation, and discloses an Ag / AgCl modified Co3O4 nano-composite material, a preparation method and application, and comprises the following steps: dissolving inorganic compounds of Ag elements and inorganic compounds of Co elements in deionized water, adding a proper amount of NaCl solution first, then adding N2H4.H2O solution, and obtaining Ag / AgCl loaded alpha-Co(OH)2 nanosheet material by using coprecipitation and in-situ reduction method; and drying and sintering the Ag / AgCl loaded alpha-Co(OH)2 nanosheet material to obtain the Ag / AgCl modified Co3O4 nano-composite material. The application provides a preparation method of a low-temperature high-response gas sensing material, the prepared Ag / AgCl loaded Co3O4 material has higher ethanol gas response performance, can significantly reduce the optimal working temperature of the sensing material, has potential application prospect, and can be used for monitoring alcohol pollutant gases in atmospheric environment, chemical plant environment, home environment and the like.

The invention discloses a quaternary ammonium salt / magnetic biochar composite material and a preparation method and application thereof.The preparation method includes the steps that rice husk-based biochar is prepared from agricultural waste rice husks, magnetic iron-based biochar is synthesized through an alkaline chemical coprecipitation method, and then the quaternary ammonium salt / magnetic biochar composite material is prepared from the magnetic iron-based biochar and quaternary ammonium salt compounds through an ion exchange method; the obtained composite material has a remarkable sterilization effect and excellent quaternary ammonium salt slow-release performance; secondly, the used quaternary ammonium salt / magnetic biochar composite material can be used as a raw material to prepare the regenerated quaternary ammonium salt / magnetic biochar composite material, the sterilization effect is better than that of the first use, and the recycling of the composite material is realized. The preparation method is wide in raw material source and low in cost, the obtained composite material adsorbs free thalli through high-density charges, generation of drug resistance and secondary environmental pollution are avoided, the composite material can be applied to sewage and wastewater treatment, and a new material and a new method are provided for solving the pollution problem of pathogenic bacteria in water.

A one-step method for preparing a magnetic magnesium-iron layered double hydroxide (LDH)-biochar composite material and use thereof provided. Biomass, as a substrate, is placed in a ferric salt solution, magnesium hydroxide is added, the materials are fully stirred and aged for a certain time, the aged materials are dried to obtain a magnesium-iron LDH-biomass, and the magnetic magnesium-iron LDH-biochar composite material is obtained after pyrolysis. The method solves problems of uncontrollable reaction and low crystallinity of products in preparing LDH using a coprecipitation method, reduces the amount of drugs, omits a step of adjusting a pH with an alkaline solution, improves yield and reduces a cost. The obtained magnetic magnesium-iron LDH-biochar composite material exhibits an excellent performance in adsorbing phosphate in water and can be recovered by an external magnetic field. Thus, an important method is provided for preparing LDH and the composite thereof.

The invention relates to the technical field of wastewater treatment, and provides a mother liquor recovery method and system in a precursor synthesis process. The mother liquor recovery method in the precursor synthesis process comprises the following steps: carrying out pressure filtration on a reaction solution obtained by a coprecipitation method to obtain a pressure filtration mother liquor and a ternary positive electrode material precursor; carrying out first ultrafiltration on the filter pressing mother liquor to obtain a concentrated solution and filtered produced water, and recovering the concentrated solution to a reaction kettle of a coprecipitation method; performing first reverse osmosis on the filtered produced water to obtain concentrated water and reverse osmosis produced water; carrying out deamination and crystallization on the concentrated water to obtain sulfate; the reverse osmosis produced water is used for preparing a reaction material of a coprecipitation method. According to the method, the yield of the ternary precursor in the filter-pressing mother liquor can be increased, the amount of wastewater subsequently generated by the filter-pressing mother liquor is small, and the deamination efficiency is high.

The invention belongs to the technical field of drug carriers, and particularly relates to a magnetic nano-drug carrier which is prepared by the following steps: selecting traditional Chinese medicine raw materials and auxiliary raw materials, and selecting corresponding equipment for treating the raw materials; traditional Chinese medicine raw materials are pretreated, effective components are extracted through ultrasonic and reflux combination, and finally an extracting solution is purified and concentrated; preparing through a coprecipitation method; the flexible traditional Chinese medicine dressing is prepared by taking anti-inflammatory, analgesic, blood-activating and blood-stasis-removing active ingredients of 19 traditional Chinese medicines as cores and combining with the local magnetic response enrichment characteristic of the magnetic nano-carrier, the flexible traditional Chinese medicine dressing is attached to a pressurized silica gel pad of a PCI postoperative wrist strap for use, local directional enrichment of the active ingredients of the traditional Chinese medicines in a wound is promoted through the magnetic carrier, and the wound healing effect is improved. The pressurizing silica gel pad has the synergistic effects of resisting inflammation, easing pain, improving microcirculation and dredging collaterals and restoring the pulse, solves clinical pain points such as inflammation edema, obvious pain and unsmooth local blood supply of a wrist puncture wound after the PCI operation, and meets the requirements of flexibility, ventilation and fitting of the pressurizing silica gel pad at the same time.

The invention provides a core-shell structure composite flame-retardant synergist, a preparation method and application thereof, an intumescent fireproof coating, and preparation and application thereof, and belongs to the technical field of fire-fighting materials. Through a coprecipitation method, ammonium polyphosphate APP and melamine MEL which exist independently traditionally are compounded and assembled at a molecular level on the surface of a zinc borate particle serving as an anchor point to form a core-shell integrated functional particle. At the high temperature of a fire, due to close contact and extremely short reaction path of APP and MEL of the shell layer, violent dehydration, gasification and cross-linking reaction can be instantly generated, strong expansion driving force with more controllable directionality is generated, the expansion efficiency is greatly improved, and the coating fire resistance, carbon layer quality and durability of the fireproof coating can be remarkably improved.