230results about How to "Synthesis conditions are simple" patented technology

The invention relates to a titanium dioxide / chitosan / oxidized graphene composite material. A preparation method for the titanium dioxide / chitosan / oxidized graphene composite material comprises the specific steps of dispersing graphite oxide into dilute acetic acid to prepare dispersion liquid, adding chitosan powder into the dispersion liquid, uniformly stirring the chitosan powder and the dispersion liquid, then adding titanium dioxide, continuing to stir the materials to form a glue solution; dropping the glue solution into a sodium hydroxide solution, stewing the solution for 4-12 hours, and washing the solution until the solution is neutral to obtain composite gel. The prepared material can be applied to treating heavy metal, namely arsenic, in wastewater and can be used repeatedly. The composite material preparation method disclosed by the invention is simple; the composite material has a good removal effect on arsenic, can separate solid and liquid easily, is simple, high in efficiency and environment-friendly and has a good application prospect.

The invention belongs to the field of super-amphiphobic materials and discloses an aqueous dispersion crosslinkable random fluoropolymer and a constructed super-amphiphobic coat through the aqueous dispersion crosslinkable random fluoropolymer. The aqueous dispersion crosslinkable random fluoropolymer is an amphiphilic polymer with the structural formula of poly (A-r-B-r-C) and is obtained through the polymerization reaction of an aqueous dispersion monomer A, a crosslinkable monomer B and a fluorine-containing monomer C. The steps for constructing the super-amphiphobic coat through the aqueous dispersion crosslinkable random fluoropolymer are as follows: dissolving the aqueous dispersion crosslinkable random fluoropolymer into solvent, and adding a catalyst and inorganic nano-particles to form a solution; soaking a base material in the solution, or spraying the solution on the surface of the base material, and drying the base material for 1-5 hours in a dryer at the temperature of 40-120 DEG C.

The invention discloses a hydrophobicPOSS (Polyhedral Oligomeric Silsesquioxane)-based hybridization fluorinated acrylate resin as well as a preparation method and an application thereof. The formula of the hydrophobic POSS-based hybridization fluorinated acrylate resin comprises the following raw materials in percentage by weight: 2-12% of POSS-based monomer, 2-11% of hard monomer, 3-16% of soft monomer, 1.5-7% of fluoroacrylate monomer, 3-11% of crosslinking monomer, 0.4-1.3% of triggering agent and 50-79% of solvent. The application of the hydrophobic POSS-based hybridization fluorinated acrylate resin is characterized in that a crosslinking-type copolymer is mixed with a curing agent, the hydrophobic POSS-based hybridization fluorinated acrylate resin aggregates and is self-assembled in a film-forming solvent so as to form a micellar solution, then a phase isolation technology is used for ensuring that the solvent volatilizes on filter paper or a metal screen to form a film so as to construct a composite multi-scale structure, so that a super-hydrophobic coating is prepared. The preparation method has the advantages that a free radical solution polymerization method is adopted, synthetic conditions are simple, reaction routes are simple, raw materials are simple and easy to get, and the preparation technological processes of organic / inorganic hybrid materials are greatly simplified; the hydrophobic POSS-based hybridization fluorinated acrylate resin has wide application prospect in the field of waterproof and dampproof coating and the like.

The invention discloses a POSS (Polyhedral Oligomeric Silsesquioxane) based hybridized fluorinated acrylate resin, and a preparation method and an application thereof. The formula of the resin comprises the following components by weight percent: 0.9-14% of POSS based monomer, 1.5-10% of hard monomer, 2.5-14% of soft monomer, 4-10.5% of acrylic higher ester monomer, 1.8-6% of fluoridized acrylate monomer, 1.8-9% of cross-linked monomer, 0.4-1.5% of initiator and 50-80% of solvent. According to the invention, the acrylic higher ester monomer is introduced as an oleophilic monomer into a fluorinated acrylate copolymer and then a hydrophobic and oleophilic compound multi-scale structure is established on filter paper or a metal filter screen by virtue of aggregating self-assembly of the POSS base in the copolymer; therefore, a hydrophobic and oleophilic coating is prepared. The resin coating prepared from the resin provided by the invention is applicable to the oil-water separation field and capable of removing trace moisture in the fuel oil, and has great practical application significance.

The invention relates to a synthetic method for a high-speed instant-absorption type super absorbent resin. The synthetic method comprises the following steps: 1) adding a copolymerization water-soluble monomer, a cross-linking agent and an initiator into a mixed aqueous solution of acrylic acid and sodium hydroxide, placing an obtained mixture in a glass container and carrying out stirring so as to prepare a water phase solution; 2) with a dispersant as a continuous phase of inverse emulsion polymerization, adding the dispersant into a reaction flask and then adding an emulsifier and a copolymerization hydrophobic monomer to prepare an oil phase solution; and 3) adding the water phase solution into the oil phase solution drop by drop, carrying out mixing and high speed stirring for emulsification, allowing a temperature to gradually rise after uniform stirring of a system, wherein time for a later-period polymerization reaction is 2.5 to 3.5 h, cooling to room temperature after completion of the reaction and successively carrying out filtering, washing and vacuum drying so as to obtain the white powdery water-absorption resin. The invention has the following beneficial effects: since synthesis conditions are simple, the imbibition rate of the resin can be improved while high water absorbency is maintained.

The invention discloses an asphalt-based nanoporous carbon material, a negative material thereof, and a lithium ion battery. The asphalt-based nanoporous carbon material is prepared by mainly using 0.1-10g of asphalt, 3-50g of anhydrous aluminum trichloride, 100-400ml of anhydrous carbon tetrachloride and 200-500ml of a reaction terminating agent, and the amounts of the above raw materials can be freely adjusted in proportion. The asphalt-based nanoporous carbon material is prepared by mainly using asphalt, anhydrous aluminum chloride, anhydrous carbon tetrachloride and the reaction termination agent, and asphalt and anhydrous carbon tetrachloride undergo a Friedel-Crafts crosslinking reaction through a nanometer pore forming technology, so the obtained asphalt-based carbon material has a porous structure and a high specific surface area, and the negative material prepared by using the asphalt-based nanoporous carbon material has the characteristics of strong electrolyte imbibition and retention ability, good processing performance, low price and the like, and can greatly improve the cycle performances of the lithium ion battery.

The invention relates to a fibriuretinin synthesis method. The method takes berberine hydrochloride as a starting material and comprises the following steps: selectively carrying out decomposition reaction on methylenedioxy of the berberine hydrochloride to obtain ortho-dyhydroxyl berberine hydrochloride; carrying out methylation reaction on hydroxyl of the ortho-dyhydroxyl berberine hydrochloride and dimethyl sulfate, recrystallizing, and adding hydrochloric acid to regulate pH value to obtain the target product, i.e. fibriuretinin. The fibriuretinin synthesis method has less synthesis steps, simple technology, and high total yield of 49.3% and the raw materials are easy to collect, so as to reduce cost, improve production efficiency and contribute a new synthesis method for fibriuretinin chemosynthesis industrialization.

The invention discloses a dynamic polymer with a hybrid cross-linked network. The dynamic polymer contains common covalent cross-linking and dynamic covalent organic borate bonds. The dynamic polymerintegrates the respective advantages of the dynamic covalent organic borate bonds and the common covalent cross-linking, and polymeric materials of abundant structures and with diversified propertiescan be prepared by regulating the structures of reactants. The high dynamic reversibility of the dynamic covalent organic borate bonds in the dynamic polymer allows the polymer to present the functional characteristics of stimulation responsiveness, self repair performance; the common covalent cross-linking endows the dynamic polymer with certain strength and stability; moreover, based on the dynamic nature of the dynamic organic borate bonds, the dynamic polymer has the characteristics of energy dissipation and energy absorption and the good functions of damping, shock absorption, sound insulation, impact resistance, high toughness and the like. The dynamic polymer can be used for preparing damping and buffering materials, anti-impact protection materials, self-repairing materials, toughmaterials, force transducers, etc.

The invention discloses a preparation method of a cellulose grafted epoxy vegetable fat anionic polymeric surfactant. The preparation method comprises the following sequentially-connected steps: fully dissolving a cellulose material in a solvent, stirring, heating to 30-70 DEG C, adding epoxy vegetable fat, dropwise adding an initiator solution, reacting for 1-2 h under the condition of heat preservation, and removing the solvent, so that a cellulose grafted epoxy vegetable fat product is obtained; hydrolyzing the cellulose grafted epoxy vegetable fat product under the action of a catalyst, and purifying the obtained object, so that a cellulose grafted epoxy vegetable fatty acid is obtained; and dispersing the cellulose grafted epoxy vegetable fatty acid in water, adjusting the pH value to 7-11, and carrying out distillated dehydration on the obtained product, so that the cellulose grafted epoxy vegetable fat anionic polymeric surfactant is obtained. The preparation method is wide in raw material sources and low in price, the prepared surfactant is biodegradable, mild in synthetic conditions and simple in preparation process, has less pollution to the environment, and accords with the concept of sustainable development.

The invention discloses a polyhydroxyalkanoate synthesis bacterium Pseudomonas lundensis PHA5 and a method for preparing polyhydroxyalkanoate by the culturing and fermentation of the bacterium. The bacterial strain takes glucose as a single carbon source to synthesize shortest-chain and medium-long-chain copolymerized PHA. The synthesis condition of PHA with the single carbon source avoids the requirements on the types and proportion of multifarious carbon sources, therefore simplifying the synthesis condition of the shortest-chain and medium-long-chain copolymerized PHA; the PHA which is composed of multifarious shortest-chain monomers and medium-long-chain monomers has more excellent machinery and processing performance than shortest-chain PHA and medium-long-chain PHA, and has a wider application prospect.

The invention discloses a composite anti-salt agent, which mainly comprises a ferrocyanide solubilizer A and a complexone B, and can further comprise a polymer lattice modifier C and / or water. According to the present invention, the composite anti-salt agent has a synergistic effect, wherein the ferrocyanide solubilizer A in the composite anti-salt agent can substantially increase the solubility of the salt, and provides the main effect of the composite anti-salt agent, the complexone B in the composite anti-salt agent has good complexation effects on metal ions and can change the metal ion concentration of the salt crystal so as to reduce the solubility product of the salt crystal, and the polymer lattice modifier C can change the compact structure of the salt into the loose structure soas to make the salt be easily carried away by the flowing of the solution. According to the present invention, the composite anti-salt agent can provide excellent salt crystallization prevention effect on salt solutions with highly mineralized sodium chloride, and further can provide good salt release effects on salt solutions with highly mineralized sodium chloride, calcium chloride and magnesiumchloride.

The invention belongs to the technical field of novel catalytic material preparation and discloses a NiTi hydrotalcite nanosheet catalyst responding to visible light and a preparation method of the catalyst. According to the invention, NiTi hydrotalcite nanosheets are synthesized by an anti-phase microemulsion method and show excellent catalytic performance by visible light. The preparation method realizes controllability of a microemulsion environment by adjusting and controlling the proportions of a surface active agent and water; and hydrotalcite is crystallized and grows in the microemulsion and the particle size of the hydrotalcite ranges from 30 nm to 80 nm. A solvent used in the method is low in cost and simple to operate and can be recycled. The obtained hydrotalcite nanosheet catalyst has the advantages of simple synthesizing conditions, cheap raw materials and easiness in large-scale industrial production. The NiTi hydrotalcite nanosheet catalyst prepared in the invention has an excellent characteristic of responding to visible light, is five times quicker than micron-sized hydrotalcite synthetized with a traditional codeposition method in water decomposition performance by visible light, and is hopefully expected to be widely applied to the fields like solar thermal utilization, adsorption and additives.

The invention relates to red luminous silicon-oxygen nitride fluorescent material, preparation method and light emitting device using same. The general formula of the fluorescent material is MIuMIIv(Sil-alphaAalpha)wO deltaN(2 / 3(u+v)+4 / 3w-2 / 3delta): Eux, Ry, Dz, wherein MI is a Ca or Sr element; MII is selected from at least one element of Sr or Ca, Ba and Zn; A is selected from at least one element of Ge, Al, Ca and In; R is selected from at least one element of Nd, Dy, Ho, Tm, Ce, Er, Pr, Bi, Sm, Yb, Lu, Gd, Tb and Mn; D is selected from at least one ion of F-, Cl-, Br- and I-; and u, v, w, alpha, delta, x, y and z are molar coefficients. The fluorescent material capable of being excited by ultraviolet-blue-green light and emitting red light is prepared by adopting a normal pressure self-reduction synthesis method and applied to manufacture LED devices.

The invention belongs to the technical field of nano material preparing. A sea-urchin-shaped gold nano particle synthesis method comprises the following steps that firstly, a soluble silver source anda soluble gold source are evenly mixed, a weak reducing agent is rapidly added, stirring is conducted for a certain time, and a silver / gold seed with the rough surface is obtained; and secondly, thesilver / gold seed and a certain number of gold sources are mixed, and after stirring is conducted for 20 s, centrifugal separation is conducted, the mixture is scattered into deionized water again, andsea-urchin-shaped gold nano particles are obtained. By means of the method, the sea-urchin-shaped gold nano particles high in yield and adjustable in particle size and surface spine density, length and width can be obtained. The gold nano particles with different spine structures have different ultraviolet-visible absorption spectra, and adjustable red shift of an LSPR peak can be shown. In addition, the gold nano particles, namely the sea-urchin-shaped gold nano particles different in spine structure can have different degrees of enhancing functions on raman signals. The method has good application potentials on surface enhanced raman scattering.

The invention discloses a fatty alcohol-polyoxyethylene ether propionate surfactant and a preparation method thereof and an application thereof to tertiary recovery. In a specific scheme, a novel anionic surfactant is synthesized by performing addition and saponification reactions on alcohol ether, methyl acrylate and sodium hydroxide serving as major raw materials. The method has the advantages of simple process, no need of special equipment, low raw material cost, wide source, stable product performance, environment friendliness and economic efficiency. The fatty alcohol-polyoxyethylene ether propionate surfactant is completely different from the conventional nonionic and anionic surfactants for displacement of reservoir oil, and high surface activity, thermal stability, salt resistance, compatability and biodegradability are achieved by embedding an ethoxy group into an anionic surfactant long alkyl chain. After fatty alcohol-polyoxyethylene ether propionate is compounded with other surfactants, a very good synergistic effect is achieved, and ultralow interface tension can be formed on a water-crude oil interface. Moreover, the surfactant is a salt-resistant, temperature-resistant and alkali-free surfactant for displacement of reservoir oil.

The invention discloses a molecular bottle brush type reverse phase adsorbent and a preparation method thereof. The molecular bottle brush type reverse phase adsorbing material is obtained by taking hydroxyethyl methacrylate containing an ethylenic bond and styrene as monomers and sequentially polymerizing on the surface of dopamine-coated magnetic graphene through an atom transfer radical polymerization (ATRP) method. A separating material disclosed by the invention has the characteristics of high adsorption capacity and long service life, and can be used for enriching and quantitatively analyzing bisphenol A in environmental water, so that the separating and enriching efficiency of the bisphenol A can be greatly improved.

The invention discloses an energy-absorbing method based on a hybrid cross-linked network dynamic polymer. The method is characterized in that the hybrid cross-linked network dynamic polymer containing common covalent cross-linking, a dynamic covalent bond and an optional supramolecular hydrogen bond is used as an energy-absorbing material for energy-absorbing protection, wherein the dynamic covalent bond is an inorganic borate bond. The dynamic polymer provided by the invention integrates the respective advantages of the common covalent cross-linking and the dynamic covalent bond; the commoncovalent cross-linking endows the dynamic polymer with certain strength and stability; the dynamic covalent bond in the dynamic polymer has good dynamic reversibility, so the dynamic polymer has the characteristics of energy dissipation and energy absorption and can provide the functions of damping, shock absorption, sound insulation, impact resistance, noise abatement, impact resistance, high toughness and the like as an energy-absorbing material; and the dynamic polymer is especially applicable to the body protection of people during exercises, daily life and working, the body protection ofthe military police, explosion prevention, protection in airborne landing and aerial delivery, collision prevention of automobiles, anti-impact protection of electronic products and electric appliances, etc.

The invention discloses a method used for preparing lithium ion battery positive pole material fluophosphate vanadium lithium. The method is characterized in that a normal temperature reduction-heat treating method is adopted to prepare a lithium ion battery positive pole material LiVPO4F; the method comprises the following steps: mixing a lithium source, a vanadium source, a fluorine source and a phosphorus source according to the mol ratio of a lithium element, a vanadium element, a fluorine element, and a phosphorus element of 1:1:1:1, adding a reducer, wherein the dosage of the reducer is 1-5 times of that of the theory dosage; carrying out mechanical activation for 0.5-20 hours under the normal temperature condition, and reducing a high-price vanadium to a trivalence vanadium so as to prepare tiny amorphism LiVPO4F of small grains; and heating to 600-800 DEG C in non-oxidizing atmosphere and keeping constant temperature for 0.5-20 hours, thereby obtaining the positive pole material fluophosphate vanadium lithium. The electrochemistry performance of the prepared fluophosphate vanadium lithium is excellent. The fluophosphate vanadium lithium provided by the invention has the advantages of short flow, simple process, lower energy consumption and small production cost, and is easy to realize large scale production and the like.

The present invention relates to a composite Al2O3-SiO2-TiO2 oxide and a loading type hydrogenation-dearomatization catalyst which is obtained with the composite oxide as a support. The composite oxide support is the composite Al2O3-SiO2-TiO2 oxide which is obtained by assembling and synthesizing an aluminium source, a silicon source and a titanium source by a sol-gel method, the specific surface area of the composite Al2O3-SiO2-TiO2 oxide is 250 to 400m<2> / g, the pore volume is 0.4 to 0.6cm<3> / g, and the aperture is 4 to 10nm. The composite oxide is used as the support to load noble metal and becomes deep hydrogenation-dearomatization catalyst to be used for the hydrogenation-dearomatization treatment of oil, and particularly, the composite oxide shows the stability and the dearomatization activity better than the normal catalyst in the deep hydrogenation-dearomatization reaction of diesel oil.

The invention discloses a preparation method of a FeS2 film. The method comprises the following steps: using FTO conductive glass as a base; configuring a seed layer solution; soaking the base into the seed layer solution to coat in a pulling manner at room temperature; forming a layer of even ZnO nanocrystalline seed on the surface of the base; preparing a precursor solution; forming an even and compact ZnO nano rod array film on the surface of the base; covering the surface of the base with a Fe(OH)3 nano rod array by the ZnO nano rod array film at room temperature; carrying out vulcanizing treatment, and converting the Fe(OH)3 nano rod array into an FeS2 nano rod array. The FeS2 film comprises the base made of the FTO conductive glass; the base is covered with the FeS2 nano rod array; each FeS2 nano rod is formed by stacking FeS2 nano particles. The FeS2 film has the advantages that the optical absorption properties and the photoelectric conversion efficiency are improved by increasing the effective optical absorption area of a ferrous disulfide film.

The invention relates to a macromolecular organic silicon modifier and a preparation method and application thereof in surface treatment of a hydroxide flame retardant. According to the preparation method, hydrogen polysiloxane and vinyl-containing unsaturated siloxane are used as raw materials, platinum complex is used as a catalyst, and the macromolecular organic silicon modifier is synthesized by adopting hydrosilylation reaction; and the prepared macromolecular organic silicon modifier has a good modification effect on the hydroxide flame retardant, and can be used for effectively improving the hydrophobic property of the surface of a hydroxide in the surface treatment of the hydroxide flame retardant. The contact angle between the modified hydroxide powder and water can reach over 120 degrees and has high compatibility with an organic silicon material, and the mechanical property of an organic silicon material filled with the hydroxide flame retardant can be improved. The raw materials are readily available, the synthetic process is simple, the modification method is convenient and high in adaptability, and the modification effect is superior to that of a common silane coupling agent.

The invention discloses a method for synthesizing a slow-release polycarboxylate water reducing agent. The method comprises the following steps: with isopentenol polyoxyethylene polyoxypropylene ether, maleic anhydride and hydroxyethyl acrylate as raw materials, hydrogen peroxide as an initiator, sodium formaldehyde sulfoxylate and ferrous sulfate as co-catalysts and mercaptopropionic acid or mercaptoacetic acid as a molecular weight regulator, initiating free radical polymerization at 5-40 DEG C, and adding water into a monomer and the maleic anhydride according to a ratio to prepare a water solution A; adding the initiator and the ferrous sulfate into the solution A in proportion; dropwise adding a solution B prepared from the molecular weight regulator and the sodium formaldehyde sulfoxylate in proportion into the solution A; dropwise adding a water solution C prepared by adding water into the hydroxyethyl acrylate into the solution A; dropwise adding the solution B after dropwise adding the solution C for 2-5 minutes; dropwise adding the solution C for 0.5-2 hours; finishing the adding of the solution B within 15-30 minutes after finishing the adding of the solution C; after finishing the adding of the solution B, reacting for another 0.5-1 hour, and preparing the 40% water reducing agent by using water.

The invention belongs to the technical field of preparation of lanthanum ferrite composite oxide materials, and particularly discloses a preparation method of an A-site magnesium-calcium double-dopedlanthanum ferrite composite oxide material. The preparation method comprises the following steps of adding La(NO3)3.6H2O (lanthanum nitrate), Fe(NO3)3.9H2O (ferric nitrate), Mg(NO3)2.6H2O (magnesium nitrate) and Ca(NO3)2.4H2O (calcium nitrate) into a prepared citric acid solution; then, adding ammonium hydroxide, treating in a water bath, drying, and calcining, so as to obtain the composite oxidematerial. The preparation method has the advantages that the Mg<2+> ion and Ca<2+> ion double-doped La0.85Mg0.15-xCaxFeO3 nanoparticle is synthesized by an accurate, controllable and easy nitrate saltsol-gel method at low temperature; the obtained samples has a single phase, and is of an orthorhombic crystal system structure, the space group is Pnma, Mg<2+> and Ca<2+> are used for replacing La<3+>, and the growth of particles is inhibited; the A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material has wide application prospect in fields of electricity, magnetic sensors, industrial catalyzing, gas-sensitive material, information storage, spin-electron devices, and the like.

The invention discloses a dynamic polymer. The dynamic polymer comprises a cyclic organoborate bond produced by a reaction of an organoboric acid element with a monohydroxy element, and an optional supramolecular hydrogen bond, wherein the cyclic organoborate bond exists as a polymeric chain joint and / or cross-linked chain joint for the dynamic polymer and is a necessary condition for the formation or maintenance of the structure of the dynamic polymer. Due to the dynamic reversibility of the cyclic organoborate bond and the optional supramolecular hydrogen bond, the dynamic polymer has self-repairing performance, reusability and recyclability; moreover, the dynamic polymer prepared according to a specific formula has the characteristics of energy dissipation and energy absorption and thefunctions of damping, shock absorption, sound insulation, impact resistance, high toughness and the like based on the dynamic nature of the organoborate bond when the dynamic polymer receives an external force. The dynamic polymer or a composition thereof can be extensively used as an anti-impact damping material, a self-repairing material, a tough material, a force sensor, a sealing material, a sandwich adhesive and the like.

The invention relates to a method for preparing a composite catalyst for decomposing ozone. The method comprises the following steps: separately dissolving permanganate, an Mn<II> salt and a Cu<II> salt, so as to obtain three kinds of salt solutions; rapidly mixing the three kinds of salt solutions, stirring, carrying out an oxidation-reduction reaction, and then, carrying out filtrating and washing, so as to obtain filtrated residue of a composite oxide; adding the filtrated residue into water, carrying out mixing so as to form a suspension of the filtrated residue and the water, carrying out extra-fine grinding treatment on the suspension so as to thoroughly grind the suspension, and then, carrying out a freeze-drying process, thereby obtaining the composite catalyst for decomposing the ozone. According to the method provided by the invention, the number of synthesis steps is small, the synthesis conditions are simple, the process of extra-fine grinding treatment is simple, the dispersion effect is good, and various substances in the prepared composite catalyst are thoroughly mixed and doped, so that the catalysis effect is improved remarkably.

The invention discloses a method of preparing a flexible molecularly imprinted sensor based on carbon nanotube-loaded polymeric micelle. The method comprises the following three steps of: synthesizing an amphipathic photosensitive polymer; preparing the carbon nanotube-loaded polymeric micelle; and constructing the flexible molecularly imprinted sensor. The polymer prepared by the method can be interacted with template molecules and a carbon nanotube at the same time, a carbon nanotube composite material loading the molecularly imprinted polymeric micelle is prepared by self-assembly in one step, and the material is finally used for constructing the flexible molecularly imprinted sensor. The method disclosed by the invention is simple to operate, and the obtained flexible sensor has the advantages of excellent molecular recognition ability, high sensitivity, strong stability and the like, and overcomes the defects of a conventional physical sensor. In addition, the flexible sensor is easily integrally applied to a conventional flexible micro-electronic apparatus, and can be widely applied to the fields of food safety, biomedicine, life health and the like.

The invention relates to a preparation method of 3D micro / nano-structure spherical active iron phosphate, which comprises the following steps: (1) preparing a surfactant solution; (2) preparing an iron nitrate nonahydrate solution; (3) dropwisely adding the iron nitrate nonahydrate solution into the surfactant solution to obtain a solution A; (4) weighing a H3PO4 solution, adding the phosphoric acid solution into the solution A, stirring and mixing for 30-240 minutes to obtain a clear transparent solution B; (5) reacting the obtained clear transparent solution B under the 80-100 DEG C water bath condition for 2-4 days or under the 150-200 DEG C oil bath condition for 2-8 hours; and (6) cooling, carrying out solid-liquid separation, washing, carrying out centrifugal separation to obtain a white precipitate, and drying the white precipitate at 80-110 DEG C. The iron phosphate material can be prepared into a LiFePO4 positive pole material after being lithiated, and has the advantages of favorable high-magnification charging / discharging performance and favorable tap density.

The invention discloses a method for synthesizing titanate series electronic ceramic nano-crystalline materials, which is suitable for preparing the nano-crystalline materials of barium titanate, strontium titanate, calcium titanate series or the like. In the method, composite molten caustic soda of sodium hydroxide and potassium hydroxide is used as a reaction fluxing agent, and the reactants are cheap and readily available soluble inorganic metal salt and metatitanic acid substance; The method comprises the following steps of: performing high-energy ball milling and activation pretreatment on the reactants without harsh reaction conditions of high temperature, high pressure and the like or complex process control steps such as pH value adjustment, roasting control and the like; and performing chemical reaction under normal pressure and at the temperature of 180+ / -10 DEG C to synthesize the material. The method has the advantages of few controllable parameters in the synthesis process, simple process, low synthesis cost and suitability for scale production. The obtained titanate product has well-defined crystals and uniform size, is nano-scale and is suitable for researching the intrinsic performance and bringing the function of the nano-crystalline material into play to the greatest extent. The method promotes the domestic independent research and development level of the electronic ceramic material and provides a basis for the domestication of high-purity super-fine titanate high-end products.

The invention relates to a perovskite type photocatalyst, and specifically discloses a preparation method and applications of a calcium-doped LaNiO3 perovskite type photocatalyst. The preparation method comprises: adding water to lanthanum nitrate and nickel nitrate, completely dissolving, adding fully dissolved nickel nitrate, adding an ammonia water solution in a dropwise manner under stirring conditions, adjusting the pH value of the solution to 9-12, generating a precipitate, filtering the product, washing, drying, and roasting, wherein a molar ratio of the calcium ions to the lanthanum ions is 0.1-0.5. The invention further discloses applications of the calcium-doped LaNiO3 perovskite type photocatalyst in degradation of methyl orange in printing and dyeing wastewater. According to the present invention, the preparation method has characteristics of simple synthesis conditions and low secondary pollution, and the obtained calcium-doped LaNiO3 perovskite type photocatalyst has goodcatalytic effect, wherein the degradation effect reaches 95.01%.

The invention relates to a method for preparing a transition metal oxide positive electrode material of lithium. The method is a metal-organic coordination polymer precursor method, and the transition metal oxide of lithium can be prepared by performing thermal treatment and high-temperature calcination to the metal-organic coordination polymer. The transition metal oxide of the lithium prepared by using the method is good in crystal form, has nanoscale, special morphology and specific crystal orientation, and can show excellent electrochemical performance when being used as a positive electrode material of a lithium ion battery. The LiNi0.5Mn1.5O4 synthesized by using a method and having a spinel structure can achieve the specific capacity up to 117mAh / g when being used for discharging at 10 DEG C and 40 DEG C, and the specific capacity can be kept above 81.0% after being cyclized for 500 times. The specific capacity can achieve 105mAh / g after charging and discharging are carried out for 350 times according to 1C rate at 55 DEG C. In addition, the lithium-rich manganese-based positive electrode material 0.3Li2MnO3.0.7LiNi0.5Mn0.5O2 prepared by utilizing the method and having a laminar structure has reversible specific capacity. Two classes of materials are used as the positive electrode materials of the lithium ion battery with high specific energy and high specific power, and the method has wide application prospects.