351results about How to "Mild conditions" patented technology

The invention discloses a composite catalyst for a peracetic acid activation system and a preparation method and application thereof, and relates to the technical field of advanced oxidation water treatment. The preparation method of the catalyst comprises the following steps: preparing an aqueous solution of a cobalt source as a precursor solution; adding a manganese source into the precursor solution to obtain a Co-Mn mixed salt solution; adding a complexing agent into the Co-Mn mixed salt solution to form a stable sol system; heating the sol system at constant temperature to obtain wet gel; drying the wet gel to obtain a porous dry gel precursor; calcining the porous xerogel precursor, and then cooling and grinding to obtain the composite catalyst for the peracetic acid activation system. The composite structure in the catalyst greatly improves the rate of generating hydroxyl radicals and organic oxygen radicals by decomposing peracetic acid by promoting electron transfer circulation of a metal active center, shows good structural stability and recyclability, and is especially suitable for degradation of an organic pollutant sulfamethoxazole in a water body.

The invention discloses a preparation method of a high-stability photoresponse covalent organic framework membrane and application of the high-stability photoresponse covalent organic framework membrane in selective separation of multiple components. 4-azido azobenzene is prepared by carrying out azido reaction on 4-aminoazobenzene in an acidic aqueous solution, and then a BPTA-TAPB-COF membrane is used as a matrix to prepare the high-stability photoresponse covalent organic framework membrane. 4-azido azobenzene is efficiently grafted to the pore wall of the BPTA-TAPB-COF membrane through a click chemical reaction, the photoresponse covalent organic framework membrane is constructed, and the covalent organic framework membrane can be used for multi-component selective separation and is suitable for multi-component systems with different sizes. The azobenzene group in the pore channel of the prepared Azo-COF membrane is subjected to reversible cis-trans isomerization under the irradiation of ultraviolet / visible light, the response speed is high, and the cycle performance is good; the Azo-COF membrane has good application in the light-operated nanofiltration process, the performance of the Azo-COF membrane is not reduced after the Azo-COF membrane is continuously recycled for 12 days, and the structure of the Azo-COF membrane is kept stable.

The invention discloses a bio-based recoverable high-thermal-conductivity dynamic ordered network composite material and a preparation method thereof, and is characterized in that the material takes a bio-based multifunctional epoxy system and a carboxylic acid compound containing disulfide bonds as reaction monomers, and the reaction monomers are reacted under the conditions of high temperature and metal salt catalyzed epoxy-carboxylic acid esterification reaction to obtain the bio-based recoverable high-thermal-conductivity dynamic ordered network composite material. A dynamic ordered network structure simultaneously containing disulfide bonds and beta-hydroxyl ester bonds is constructed, and the dynamic ordered network can be used as a springboard for phonon transmission, serves as an efficient'thermal bridge ', and plays a role similar to an ordered'crystal domain', so that higher heat-conducting property is shown when heat-conducting filler is not introduced, high flexibility and intrinsic heat conduction are realized, and the service life of the material is prolonged. And the material is endowed with reprocessing and recycling characteristics. Due to the synergistic existence of carboxyl, hydroxyl generated by epoxy ring opening and metal coordination in the system, and in combination with electrostatic interaction, Van der Waals force and hydrophobic interaction, the material has the adhesion characteristic suitable for a thermal interface at the same time.

The invention discloses an etching solution and a preparation method and an etching method thereof, and belongs to the technical field of microelectronics and display panel manufacturing. The etching liquid comprises the following components in percentage by mass: 50-70% of phosphoric acid, 5-30% of acetic acid, 5-15% of nitric acid, 0.1-0.5% of a water-soluble polymer, 0.05-0.3% of a boron-containing compound, 0.05-0.5% of an etching control agent and the balance of water. The water-soluble polymer is selected from one or more of water-soluble polymers containing a hydroxyl group, an amide group, an ether bond or a pyrrolidone group. The etching solution contains a specific water-soluble polymer, a protective layer can be formed on the surface of the photoresist, attack of high-concentration acid to the etching solution is effectively inhibited, and the cracking problem is avoided; meanwhile, through the synergistic effect of the boron-containing compound and the azole etching control agent, the etching rate, the slope angle and the key size loss can be accurately controlled, and therefore the excellent etching morphology meeting the requirement is obtained.

The invention discloses an anion exchange membrane electrode and a preparation method and application thereof, and belongs to the technical field of new energy material and catalytic electrode preparation, the method comprises the following steps: S1, preparing an anode catalyst slurry comprising a hydrophobic covalent organic framework material, an anode catalyst, an anion exchange ionomer and a solvent; s2, preparing a cathode catalyst slurry of which the components comprise a cathode catalyst, an anion exchange ionomer and a solvent; and S3, respectively spraying or coating the anode catalyst slurry and the cathode catalyst slurry on two side surfaces of an anion exchange membrane or a gas diffusion layer, and carrying out heat treatment to obtain the anion exchange membrane electrode. The method provided by the invention can solve the problems of large gas-liquid-ion three-phase mass transfer resistance, easy shielding of active catalytic sites by ionomers and unbalanced water management in the membrane electrode assembly in the existing AEMWE device.

The invention relates to the technical field of electrolyte, in particular to a thioether cross-linked solid polymer electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: taking N, N-dimethylformamide, respectively adding 3, 6-dioxa-1, 8-octane dithiol and triglycidyl isocyanurate, and uniformly stirring to obtain a mixed solution; adding bis (trifluoromethylsulfonyl) imide lithium into the mixed solution, putting magnetons on a magnetic stirrer, and completely dissolving the magnetons to obtain a precursor solution; and pouring a proper amount of the precursor solution into a polytetrafluoroethylene mold, spreading, and carrying out cross-linking polymerization in a blast oven to form the film. The three-dimensional thioether cross-linked network structure has a large number of weakly coordinated thioether groups, dissociation of lithium salt can be promoted, a large number of free Li < + > is generated, the number of Li < + > is increased, meanwhile, the crystallinity of a polymer is remarkably reduced, the ionic conductivity is improved, the mechanical stability of a film can be improved, and the service life of a battery is effectively prolonged.

The present application relates to the technical field of chemical medicine preparation, and particularly relates to a preparation method of tetrabromophenol tetrahalosulfonophthalein, which is prepared from 3,4,5,6-tetrahalophenol sulfonophthalein as raw material, organic carboxylic acid in aqueous solution, liquid bromine, oxidation by hydrogen peroxide to obtain tetrabromophenol tetrahalosulfonophthalein crude product, then salification with alkali salt in an aprotic solvent to obtain tetrabromophenol tetrahalosulfonophthalein salt; and then acid conversion with organic carboxylic acid in aqueous solution, recrystallization to obtain tetrabromophenol tetrahalosulfonophthalein pure product; the present application provides a preparation method of tetrabromophenol tetrahalosulfonophthalein, which is low in cost, high in yield and purity, simple in method, mild in condition, high in yield and purity, and beneficial to mass production.

This application discloses an acetone sensor based on an ion-conducting copper ion-organic framework and its preparation method, belonging to the field of gas sensor technology. The sensor uses a glass substrate with indium tin oxide (ITO) interdigitated electrodes. The sensitive layer is an ion-conducting copper-based MOF thin film formed by the in-situ coordination reaction of tetrakis(4-aminophenyl)porphyrin and copper ions at the liquid-phase interface, constituting a capacitive gas sensor. In the preparation process, a ligand methanol solution and a copper nitrate solution are first prepared. After plasma cleaning of the substrate, the ligand solution is sprayed onto the copper salt solution interface to form an in-situ film, which is then vacuum dried to obtain the acetone sensor. This application has advantages such as simple process, low cost, high sensitivity, fast response, and good stability, making it suitable for large-scale production. It can be used for non-invasive detection of acetone in diabetic respiration, environmental monitoring, and industrial VOCs detection, showing promising application prospects.

The invention relates to a synthesis method of a 3-olefine acid ester compound. The method comprises the following steps: carrying out contact reaction on an organic phosphine ligand, a palladium compound, conjugated olefin, an alcohol compound and carbon monoxide; wherein the structural formula of the organic phosphine ligand is shown in the specification, and in the structural formula, R0 and R1 are respectively selected from hydrogen, alkyl, alkoxy, halogen or halogenated alkyl; and R2 and R3 are respectively selected from hydrogen or alkyl. The method provided by the invention has the advantages of mild conditions, no need of an acid auxiliary agent, high yield and selectivity of the generated 3-olefine acid ester compound, reduction of corrosion to a reactor, and good application prospect, and the speculation is that the electrical property of phosphorus atoms can be regulated and controlled by using the organic phosphine ligand provided by the invention, so that the reaction activity of the palladium-organic phosphine ligand catalyst is regulated and controlled, and the yield and selectivity of the 3-olefine acid ester compound are improved. Therefore, the palladium-organic phosphine ligand catalyst generated by the ligand and a palladium compound in situ can efficiently catalyze the reaction of conjugated olefin, carbon monoxide and alcohol compounds.

This invention discloses a Pickering emulsion based on silk fibroin self-assembled particles and its preparation method. The preparation method includes the following steps: adjusting the pH of the silk fibroin solution to 4.0-4.5, adding NaCl to a final concentration of 0.05-0.1 mol / L, mixing, and then heating to 40-50 °C and allowing it to stand at a constant temperature. Using the obtained silk fibroin self-assembled particle dispersion as the aqueous phase and vegetable oil as the oil phase, the mixture is mixed with excipients and homogenized by high-speed shearing to obtain a primary emulsion. This primary emulsion is then treated by high-pressure microfluidic jet to obtain the Pickering emulsion based on silk fibroin self-assembled particles. This method requires no chemical modification or exogenous reagents, is green and simple, and does not use organic solvents. It can prepare emulsions with high biosafety and high storage stability without emulsifiers, improving process safety and scalability, and broadening its application in the food, cosmetics, and biopharmaceutical fields.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a small-particle precursor for a manganese-rich positive electrode material and a preparation method of the small-particle precursor. The manganese-rich precursor with fine primary particles and large specific surface area is prepared by using the non-ammonia complexing agent, an oxidizing atmosphere is not needed, the preparation process is simple, the process control is stable, and mass production conversion is facilitated.

The invention discloses a preparation method of low-cost graphene oxide for a high-performance heat-conducting film, which comprises the following steps: S1, mixing a graphite raw material and an acid solution at 5 DEG C or below, controlling the temperature of a reaction system at 10 DEG C or below, adding an oxidizing agent, reacting for 0.5-1.5 hours, and carrying out solid-liquid separation to obtain a filter cake; s2, adding the filter cake into concentrated sulfuric acid, controlling the temperature of a reaction system to be below 15 DEG C, slowly adding an oxidizing agent, reacting for 1.5-2.5 hours, heating to 30-45 DEG C, and reacting for 0.5-2 hours to obtain a reaction solution; s3, diluting the reaction liquid, and terminating the reaction to obtain graphene oxide dispersion liquid; and S4, carrying out solid-liquid separation on the graphene oxide dispersion liquid to obtain a solid, wherein the solid is the low-cost graphene oxide for producing the high-performance heat-conducting film. The acid liquor comprises sulfuric acid, and the concentration of the sulfuric acid in the acid liquor is 30%-65%. According to the method, low-concentration sulfuric acid is firstly adopted for intercalation, then concentrated sulfuric acid is adopted for intercalation, and low-temperature and medium-temperature reaction systems are matched, so that the safety of the process is improved, the consumption of sulfuric acid and an oxidizing agent is reduced, and waste liquid output liquid is reduced.

The application discloses a preparation method of a nitrogen-containing heterocyclic compound and an alkali metal salt of the nitrogen-containing heterocyclic compound, and steps of the preparation method of the nitrogen-containing heterocyclic compound comprise: (1) uniformly mixing trithiocyanic acid with a first solvent, introducing sulfuryl fluoride gas or adding an alkenyl sulfonyl fluoride to perform a reaction, and obtaining a crude product through a crude treatment after the reaction is finished; (2) purifying the crude product to obtain the nitrogen-containing heterocyclic compound shown in a structural formula 1; wherein R1, R2 and R3 are each independently selected from -H, -SO2F or -CH2-(CH2) n -SO2F, n is an integer selected from 1-10, and R1, R2 and R3 are not H at the same time. The preparation method of the nitrogen-containing heterocyclic compound and the alkali metal salt of the nitrogen-containing heterocyclic compound can be applied to a large amount of trithiocyanic acid in a lithium battery electrolyte, raw materials are easy to obtain, operation is simple, the yield is high, the condition is mild, the requirement for equipment is low, and the method is suitable for industrial production.

The application relates to a double-metal hydroxide, in particular to application of a CuAl double-metal hydroxide, in particular to application of the CuAl double-metal hydroxide in preparation of a preparation for inactivation of pathogenic bacteria, fungi and viruses. The CuAl double-metal hydroxide is prepared by a formamide liquid phase stripping method. Compared with the prior art, the application solves the problem of high cost of a silver ion loaded layered double-metal hydroxide in the prior art, and realizes preparation of a low-cost, high-performance and green antibacterial material with a bactericidal and antiviral effect.

The invention relates to the technical field of adsorbent materials, and discloses a CoMn2O4 spinel adsorbent and a method for removing trivalent antimony in a water body by using the CoMn2O4 spinel adsorbent. The adsorbent is prepared by adopting a co-precipitation and low-temperature thermally induced crystallization synergetic green process: dissolving cobalt salt and manganese salt according to a stoichiometric ratio, dropwise adding a sodium hydroxide solution for co-precipitation, washing an obtained precursor, and drying at 80-120 DEG C under normal pressure for 12-48 hours to directly obtain the adsorbent. According to the method, the spinel material with low crystallinity, high specific surface area and rich surface hydroxyl is controllably synthesized by regulating and controlling the concentration of the precipitator and the drying condition, and the problems of active site loss and high energy consumption caused by traditional high-temperature calcination are avoided. When the composite material is used for treating wastewater containing trivalent antimony, antimony ions can be efficiently removed through the adsorption effect under the appropriate pH condition, excellent adsorption capacity is shown, the technology is simple, cost is low, safety is good, and an efficient and stable adsorption material and a feasible method are provided for water body antimony pollution treatment.

The application discloses a comb-shaped long-chain alkyl copolymer asphalt inhibitor and a preparation method and application thereof. First, octadecyl methacrylate, maleic anhydride and styrene are used for copolymerization, and then an amide reaction of the copolymer and tetradecylamine or octadecylamine is carried out to obtain the comb-shaped long-chain alkyl copolymer asphalt inhibitor. The inhibitor has an inhibition rate of greater than 95%, raw materials are easy to obtain, reaction conditions are mild, and the inhibitor is suitable for large-scale production. The preparation method only needs two-step conventional reactions, and high pressure and special purification equipment are not needed.

This invention discloses an optimized extraction and purification process for total flavonoids from Hypericum perforatum and its application in photodamage protection. Belonging to the field of natural product extraction technology, the process includes the following steps: using Hypericum perforatum powder as raw material, ultrasonic-assisted extraction is performed, followed by centrifugation, collection of the supernatant, and repeated extraction of the residue twice. The supernatants are combined to obtain a total flavonoid extract from Hypericum perforatum. The extract is then purified by adsorption using a macroporous adsorption resin, and the eluent is collected, concentrated, and dried to obtain high-purity total flavonoids from Hypericum perforatum. This invention features a stable process, high extraction efficiency, and is environmentally friendly, making it suitable for industrial production. The prepared total flavonoids from Hypericum perforatum exhibit high purity and significant antioxidant and photoprotective effects, and can be widely used in antioxidant, skin protection, and sunscreen products.

The application discloses a kind of cyanobacterial polysaccharide and PVA composite material preparation method, comprising the following steps: S1: PVA and cyanobacterial polysaccharide are dissolved in deionized water to obtain premixed solution;S2: crosslinking agent ethylene glycol diglycidyl ether is added to the premixed solution prepared in step S1 and heated to react, to obtain mixed solution;S3: tannic acid is added dropwise to the mixed solution prepared in step S2 to obtain film forming liquid, and the film forming liquid is laid flat and dried to obtain a cyanobacterial polysaccharide and PVA composite film.The application forms a crosslinked network structure by PVA, cyanobacterial polysaccharide and ethylene glycol diglycidyl ether through ring-opening reaction, while meeting biocompatibility and mechanical properties, it can greatly improve the barrier property of the material, and can be used as functional packaging film, fresh-keeping adsorption gasket, etc. for fresh fruits and vegetables, livestock and poultry meat food storage and transportation.

The present application relates to a kind of methods for catalytically converting methane to olefins, aromatics and hydrogen in joule heat coupled metal catalytic reactor.The methane feed gas heated by hot joule heat is passed into metal catalytic reactor for catalytic conversion reaction to prepare olefins, aromatics and hydrogen using joule heat as heat source.The conversion rate of methane is 35-85%;The selectivity of olefins is 65-90%;The selectivity of aromatics is 13-40%;Zero carbon deposition.The present application has the characteristics of electric heating conversion efficiency > 90%, long catalyst life, high methane conversion rate and product selectivity, zero carbon deposition, catalyst does not need to be enlarged, small industrialization difficulty, good process repeatability, safe and reliable operation, etc., and has broad industrial application prospect.

The application provides a synthesis method of 1-substituted phenanthrene compounds, which comprises the following steps: mixing ortho-substituted aryl diazonium salt with KI, adding a palladium acetate catalyst, adding norbornadiene, adding a base, adding an organic phosphine ligand, adding 2-halobenzoic acid, heating to 80-150 DEG C in an aprotic solvent under a nitrogen atmosphere, and reacting for 2-10 hours to obtain the 1-substituted phenanthrene compounds. The method uses cheap and easily obtained ortho-substituted aryl diazonium salt instead of expensive aryl iodide to prepare 1-substituted phenanthrene compounds, and has the characteristics of easy raw material, mild conditions and simple operation, and is a simple synthesis method of 1-substituted phenanthrene compounds.

The invention provides a preparation method of ultralow-viscosity vinyl methoxy-terminated silicone oil, which is mainly applied to a structure control agent in the field of silicone rubber.The preparation method comprises the steps that a polydimethylsiloxane linear body serves as a raw material, dimethyl vinyl methoxy silane serves as an end-capping reagent, a base catalyst is added, a polymerization reaction is conducted till the viscosity is stable, and the ultralow-viscosity vinyl methoxy-terminated silicone oil is obtained. And adding phosphoric acid gel for neutralization, carrying out gradient heating to 90 DEG C, and carrying out devolatilization under a vacuum condition to obtain the methoxy hydroxyl-terminated silicone oil. The technological process is simple and easy to operate, and the product is uniform in molecular weight distribution and high in flash point, has the advantages of improving the processability and the mechanical property as a structure control agent, and can improve the molecular crosslinking density and improve the strength of a silica gel product in the product vulcanization technological process.

This invention discloses a superhydrophobic fiber membrane with a wrinkled structure and its preparation method. The preparation method is as follows: immersing a polypropylene fiber membrane in a methanol solution of a photoinitiator; removing it and irradiating it under a UV lamp; then immersing it in a methanol solution of an amino monomer and irradiating it under a UV lamp; then immersing it in a hexane solution of an acyl chloride, removing it, and then immersing it in a methanol solution of a hydroxyl monomer for interfacial polymerization; removing it; drying it; immersing it in a hexane solution of a long-chain alkylchlorosilane, removing it, and drying it to obtain a superhydrophobic fiber membrane with a wrinkled surface structure. The method of this invention is simple, easy to implement, and operates under mild conditions, requiring no precision instruments. It offers fast separation speed, high efficiency, and good reusability. When used to separate water-in-oil emulsions containing surfactants, the wrinkled structure on the fiber membrane surface increases the contact area between the superhydrophobic surface and the emulsion, promoting the coalescence and demulsification of microemulsions, and achieving a water retention rate of over 99%.

This invention discloses a hydrazone-linked fluorine-substituted covalent organic framework material, its preparation method, and its applications, belonging to the field of semiconductor photocatalysis technology. The material is synthesized by hydrazone condensation of 1,3,5-trifluoro-2,4,6-tris(4-formylphenyl)benzene and terephthalohydrazide, denoted as F-TPDH-COF. A one-step solvothermal synthesis is employed, resulting in a mild, environmentally friendly, low-cost, and easily scalable process. The material obtained by this invention utilizes hydrazone bonds to achieve proton enrichment in acidic media, and fluorine atoms regulate the electronic structure to improve charge separation efficiency. Under pH=2 conditions, the photocatalytic hydrogen peroxide production rate reaches as high as 5825.2 μmolg. ‑1 h ‑1 Its activity and stability are significantly better than most existing COF photocatalytic materials, and it can be used for efficient photocatalytic preparation of hydrogen peroxide in acidic systems, showing good prospects for industrialization.

The present application relates to the field of sodium hyaluronate preparation, in particular to a preparation method of low molecular weight sodium hyaluronate. Specifically comprising the following steps: stirring and dissolving macromolecular weight sodium hyaluronate powder into water at 45-60 DEG C to obtain a macromolecular weight sodium hyaluronate solution; cooling to 35-45 DEG C, adding a buffer solution and mixing uniformly, then adding papain and hyaluronidase with a mass ratio of (2-3):(3-6) for enzymatic reaction to obtain an enzymatic solution; adding sodium hydroxide solution to the enzymatic solution, adjusting pH to 7.5-9.0, heating to 80-90 DEG C for 20-40 minutes, then filtering to obtain a low molecular weight sodium hyaluronate solution; spray drying, and the process is simple, the conditions are mild, the product structure is not damaged, and the prepared low molecular weight sodium hyaluronate has high purity, uniform molecular weight distribution and good permeability.

The application provides a copper adsorption material and a preparation method and application thereof, and the copper adsorption material is prepared by using salicylic hydrazide monomers and methacrylic acid as raw materials through an emulsion polymerization method. The salicylic hydrazide monomers used in the application are salicylic hydrazide derivatives with introduced propylene bonds, and the multi-dentate coordination structure of the salicylic hydrazide derivatives can specifically chelate copper ions; the hydrophilic monomer used is methacrylic acid, and the carboxyl group of the methacrylic acid can bring good hydrophilic performance to the material and improve adsorption kinetics. The copper adsorption material of the application is applied to a mixed solution containing copper ions, nickel ions and cobalt ions to selectively separate copper ions.

The present application relates to a kind of fluorine-containing dihydronaphthalenone derivative and its preparation method and application, the fluorine-containing dihydronaphthalenone derivative obtained by visible light induced phosphine catalysis difluoroacetophenone derivative and the radical addition cyclization reaction of a variety of olefins in series compared with prior art, the preparation method of the present application has the advantages of high efficiency, short reaction time, high yield, mild condition etc., its structural motif is important in pharmaceutical and agrochemical products;The synthetic method for preparing fluorine-containing dihydronaphthalenone and its derivative of the present application is completely new, and the fluorine-containing dihydronaphthalenone compound synthesized is used in various organic synthesis reactions.

This invention discloses a trifluoromethylselenoquinone derivative, its preparation, and its application. The structure of the trifluoromethylselenoquinone derivative is shown in formula (I). Wherein, the R1 group is selected from H, halogens, C... 1‑5 Alkyl, C 1‑5 One of alkoxy and acetyl groups, and R2 group selected from monosubstituted or unsubstituted phenyl and thiophene groups. This invention is the first to develop a photochemical synthesis method for trifluoromethylselenoquinone derivatives. This method uses visible light as a clean driving force and has the advantages of mild conditions and environmental friendliness. This invention successfully introduces the trifluoromethylseleno group into the naphthoquinone core, constructing a novel functional molecule that integrates the advantages of the naphthoquinone skeleton, fluorine atom, and chalcogenide triple structure, enriching the library of fluorine-containing chalcogenide heterocyclic compounds and providing a novel structural unit for innovative drug development. The compound synthesized in this invention exhibits excellent VDR agonist activity and has good drug development prospects. (I)

The present application relates to the technical field of pesticides, and discloses a phase change eutectic carrier embedded with a photothermal agent as well as a preparation method and application thereof.The phase change eutectic carrier embedded with the photothermal agent mainly comprises a photothermal agent, a fatty acid, an organic solvent and water.The preparation process of the preparation is simple, the conditions are mild, a large number of additives are not needed, and the preparation can be quantitatively prepared.The dispersion and utilization rate of the bactericide can be improved through eutectic, and the effectiveness of the bactericide can be improved.The preparation is suitable for various application modes such as seed coating and soil treatment, can play various synergistic functions such as temperature response release, prolonging drug retention time, enhancing adhesion and permeability on the surface of pathogenic bacteria, and is a kind of green and efficient bactericide dosage form, which has a wide application prospect in green and intelligent agriculture.

The invention belongs to the technical field of organic synthesis, and discloses a method for synthesizing an alkyl halide from a carbonyl compound through a one-pot method, the carbonyl compound (aldehyde or ketone) is used as a raw material, hydrazinium is added, on one hand, the hydrazinium can be used as a reducing reagent for reducing carbonyl, and on the other hand, the hydrazinium can be used as a halogen donor for a halogen substitution reaction; an efficient conversion effect is achieved in the presence of an additive, and the synthesized alkyl halide derivative can be used as an important raw material and an intermediate for organic synthesis and drug synthesis. The method is simple and convenient to operate and good in functional group compatibility, and a new thought is provided for synthesizing polysubstituted alkyl halide derivatives.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a manganese ferrite / bismuth tungstate heterojunction photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving sodium tungstate dihydrate, bismuth nitrate pentahydrate and cetyltrimethylammonium bromide in deionized water, and obtaining bismuth tungstate by using a hydrothermal method; 2) dissolving iron chloride hexahydrate and manganese chloride tetrahydrate in water, adding sodium hydroxide solution, and obtaining manganese ferrite by using a hydrothermal method; 3) dissolving the bismuth tungstate and the manganese ferrite into a sodium hydroxide solution, and then stirring and drying to obtain the manganese ferrite / bismuth tungstate heterojunction photocatalyst. The formation of the heterojunction can greatly improve the activity of the manganese ferrite / bismuth tungstate in photocatalytic reduction of carbon dioxide.