114results about How to "Experimental conditions are easy to control" patented technology

The invention discloses a method for preparing a manganese series lithium ion sieve adsorbent, and relates to a method for preparing an inorganic adsorbent for adsorbing lithium from liquid lithium resources such as brine of salt lake, seawater and the like. In the method, a cubic crystal ion sieve precursor Li1.6Mn1.6O4 is prepared from Mn2O3 and LiOH or Li2CO3 serving as raw materials by using two sections of solid-phase reactions, wherein the precursor also can be used as an anode material of a lithium ion battery. The precursor is acidized to obtain a lithium ion sieve adsorbent MnO2.0.5H2O (or expressed as H1.6Mn1.6O4), and the ion sieve is the lithium adsorbent which has high selectivity on lithium. The method has the advantages of simple and readily available raw materials, simple process, high adsorption capacity of the ion sieve, low cost, high purity of products and is easy to realize industrial production.

The invention discloses a graphene / inorganic semiconductor composite film and a preparation method thereof. The preparation method includes using graphene oxide or reducing graphene and inorganic semiconductor precursor as major raw materials, using a sol-gel method method or hydrothermal / solvent thermosynthesis method, using a function group on the surface of graphene as a nucleating point, and using the nucleating point to control size, shape and crystallization performance of an inorganic semiconductor to prepare an even composite film. Hydrogen bond, ion bond or covalent bond is formed by the prepared composite film using the function group on the surface of graphene with the inorganic semiconductor, dispersibility between graphene sheets is increased by the inorganic semiconductor, surface defects of graphene are compensated, conductivity and uniformity of graphene are increased, interface geometric contact and energy level matching of graphene and semiconductor nano-particles are improved, application range of a device is enlarged, and the graphene / inorganic semiconductor composite film is suitable for photoelectric fields of solar cells, sensors, OLEDs (organic light emitting diodes), touch screens and the like.

The invention discloses a flexible graphene composite film and a preparation method thereof. The preparation method comprises the following steps of: based on oxidized or reduced graphene and organic polymer or micromolecule with a special functional group as raw materials, forming a uniform composite material by utilizing the interaction of a surface functional group of graphene and an organic molecule group, and preparing the graphene composite film on the surfaces of different substrates through methods of spin coating, spraying and the like. According to the preparation method disclosed by the invention, by utilizing an electron withdrawing group, an electron-donating group or a conjugate group in the organic polymer or micromolecule, the hole or electron concentration on the surface of a graphene electrode is increased, the work function of the electrode is controlled, the conductivity of the graphene electrode is improved, and the application range of a device is widened. According to the flexible graphene composite film disclosed by the invention, because the interaction among the groups is utilized, the compatibility of the prepared composite film is better, the structure is uniform, and the flexible graphene composite film is suitable for the photoelectric field of solar batteries, sensors, organic light-emitting diodes, touch screens and the like.

The invention discloses a method for synthesizing barium-manganese carbonate monocrystal under high temperature and high pressure. The method comprises the following steps of uniformly grinding and mixing analytically pure barium carbonate and analytically pure manganese carbonate according to a molar ratio of 1:1, so as to obtain an initial raw material; reacting for 12h at high temperature of 700 to 900 DEG C and high pressure of 1 to 3GPa, so as to obtain a sample of barium-manganese carbonate powder crystal; grinding and mixing the sample of the barium-manganese carbonate powder crystal and anhydrous oxalic acid according to a molar ratio of 1:0.1, so as to obtain a sample; reacting for 100h at high temperature of 700 to 900 DEG C and high pressure of 3GPa, so as to obtain the sample of the barium-manganese carbonate monocrystal. The high-temperature and high-pressure method has the advantages that the operation process is simple, the experiment conditions are easy to control, andthe like. The obtained barium-manganese carbonate sample has the characteristics that the purity is high, the crystallizing degree is high, the chemical stability is good, the easiness in water absorbing is avoided, and the like; the technical problem of lack of growth method in the existing artificially synthesized barium-manganese carbonate monocrystal is solved.

The invention discloses a method for preparing transition metal oxide microspheres with controllable morphology. According to the method for preparing the transition metal oxide microspheres, the transition metal oxide microspheres are produced according to the steps of introducing catechol compounds into a reaction system and then performing simple hydrothermal reaction, and preferably, a morphology control agent can also be added in the hydrothermal reaction system to control the morphology of the transition metal oxide microspheres. According to the method for preparing the transition metal oxide microspheres with controllable morphology disclosed by the invention, the transition metal oxide microspheres with controllable morphology are produced by adding a special morphology control agent into the hydrothermal reaction system to control the anisotropic growth of the material, not only the technology is simple, the controllability is good and the yield is high, but also the product produced according to the method has uniform size, larger specific surface area and high reaction activity and is suitable for large-scale preparation.

The invention provides preparation and surface modification methods of a ferrous titanate / iron trioxide composite photoelectrode and relates to the field of materials. The preparation method of the composite photoelectrode includes the steps that FTO conducting glass is washed; the FTO conducting glass is placed in an inorganic salt water solution of titanium in the manner that the conducting face is downward, and the FTO conducting glass is soaked for 10-60 min at the temperature of 60-80 DEG C; the washed FTO conducting glass is heated for 10-30 min at the temperature of 150-200 DEG C; the heated FTO conducting glass is placed in a reaction still containing inorganic salt of iron and a mineralizer water solution, and the reaction still is heated for 2-5 h at the temperature of 60-100 DEG C; and the FTO conducting glass obtained after the reaction in the reaction still is taken out and washed, the washed FTO conducting glass is annealed for 1-3 h at the temperature of 500-600 DEG C and then annealed for 10-30 min at the temperature of 700-800 DEG C, and the nano ferrous titanate / iron trioxide composite photoelectrode is prepared. The preparation method of the composite photoelectrode is simple, experimental conditions are easy to control, and the prepared composite photoelectrode has high photoelectrocatalysis water decomposition performance.

The invention discloses a method for synthesizing iron-containing brucite at high temperature and high pressure. The method comprises the following steps of using analytically pure magnesium hydroxide, analytically pure iron powder (Fe) and analytically pure iron hydroxide, and uniformly grinding and mixing according to a molar ratio of 27:1:2, so as to obtain a starting raw material; enabling a tabletting machine to tablet the starting raw material into a cylindrical sample; selecting the analytically pure iron powder, and pressing into two iron sheets; then, putting the cylindrical sample and the iron sheets into a platinum snap fastener in a sandwich structure of iron sheet-cylindrical sample-iron sheet, and sealing; finally, loading the platinum snap fastener into an iron snap fastenerand sealing, placing the iron snap fastener into an h-BN (hexagonal boron nitride) tube, and using h-BN as a pressure transfer medium; assembling the h-BN tube into a high-pressure synthesis assemblyblock, placing into a cubic large press, and reacting for 8h at high temperature of 600 to700 DEG C and high pressure of 3 GPa, so as to obtain an iron-containing brucite sample, wherein the iron-containing brucite sample is a single material phase without impurity phase. The method solves the difficult problem of failure to artificially synthesize the existing iron-containing brucite sample.

The invention discloses a method for preparing a magnetic hollow cluster from ferroferric oxide nano crystals by one step. The method comprises the step of uniformly mixing oil soluble ferroferric oxide nano particles and a surface modifier with an active functional group at room temperature and ensuring the oil soluble ferroferric oxide nano particles and the surface modifier to be reacted in a micro emulsion system consisting of three liquid phases to form the hydrophilic magnetic hollow cluster consisting of a plurality of ferroferric oxide particles. The three liquid phase system is formed in a mode that water, a nonpolar organic solvent and a polar organic solvent are mixed. In the preparation method disclosed by the invention, the reaction is carried out at room temperature. The preparation method is simple to operate. Used medicines are simple and easy to obtain. The preparation method has good repetitiveness. The adverse effects of fussiness and high temperature in the conventional process of preparing the cluster are eliminated. The prepared nano cluster has high relaxation rate and low biotoxicity. Moreover, the surface of the prepared nano cluster is provided with the functional group so as to provide the necessary preparation for the actual application of the nano cluster to the fields of a biomarker, tissue and living imaging, clinical diagnosis and the like.

The invention discloses a preparation method of bismuth nanocrystalline. BiCl3 is taken as a bismuth source, phenanthroline is used as a surface modifier and NaBH4 is used as a reducing agent, and the bismuth nanocrystalline is synthesized in a water phase by a liquid phase surface modifying reduction method. The preparation method of bismuth nanocrystalline provided by the invention is simple in operation steps; as the types of the raw materials used are few, the preparation method is low in cost, easy to implement, and safe and environment-friendly; the experimental equipment is simple and the experimental conditions are easy to control; the bismuth nanocrystalline prepared by the method is high in purity.

The invention relates to a method for rapid asexual propagation of an aurelia aurita, which comprises the following steps of: enabling a certain density of aurelia aurita scyphistomae attached to a polyethylene corrugated plate to be propagated rapidly through gemmatio under an appropriate condition, and enabling the scyphistomae to reach a certain density within a short time; transplanting the scyphistomae on the original corrugated plate to other clean corrugated plates according to the density of 0.5-0.7 per square centimeter; adding scyphistomae nutrient solution; enabling the scyphistomae to be propagated rapidly on the new corrugated plate under an appropriate condition after the scyphistomae is attached to the new corrugated plate; and carrying out strobilation on the scyphistomae through temperature control after the scyphistomae reaches a certain number so as to generate large number of aurelia aurita ephyrae and medusas. Due to the adoption of the method, a large numberof aurelia aurita scyphistomae, ephyrae and medusas which have high activity can be obtained without aurelia aurita adults. The method is rapid, simple and economical, and is suitable for obtaining an aurelia aurita material under a simple experiment condition.

The invention discloses a preparation method of an Ag0.35V2O5 / TiO2 nano-composite photocatalyst. The preparation method is characterized by comprising the following steps: (1) mixing and uniformly stirring 14 to 17 mass percent of tetrabutyl titanate, 5 to 7 mass percent of polyvinylpyrrolidone with the average molecular weight of 1300000, 20 to 25 mass percent of absolute ethyl alcohol, 10 to 15 mass percent of dimethylacetamide and 38 to 46 mass percent of glacial acetic acid to obtain polyvinylpyrrolidone / titanate solution which is marked as a solution A; (2) mixing and uniformly stirring 3 to 6 mass percent of bisacetylacetonate vanadium oxide, 0.5 to 1 mass percent of silver nitrate, 12 to 16 mass percent of polyvinylpyrrolidone with the average molecular weight of 1300000 and 79 to 84 mass percent of dimethylacetamide to obtain a solution B; (3) mixing and uniformly stirring the solution A and the solution B to obtain a mixed solution of polyvinylpyrrolidone / titanate / bisacetylacetonate vanadium oxide / silver nitrate; (4) spinning the mixed solution to obtain nano-fiber primary material by an electrospinning method, and then annealing the nano-fiber primary material in an air atmosphere to obtain the Ag0.35V2O5 / TiO2 nano-composite photocatalyst.

The invention discloses a method for synthesizing barium carbonate iron monocrystal at high temperature and under high pressure. The method comprises the following steps: grinding and uniformly mixingthe analytic pure barium carbonate and the synthetic ferrous carbonate according to the molar ratio of 1:1 to serve as a starting raw material, performing high-temperature and high-pressure reactionfor 12 hours at 500 to 800 DEG C and under the pressure of 1 to 3 GPa to obtain a barium carbonate iron powder crystal sample, grinding and mixing the barium carbonate iron powder crystal sample and anhydrous oxalic acid according to the molar ratio of 1:0.1 to prepare a sample, and performing high-temperature and high-pressure reaction for 100 hours at 700 to 900 DEG C and under the pressure of 3GPa to prepare a barium carbonate iron monocrystal sample. The high-temperature and high-pressure method has the advantages that the operation process is simple and the experimental condition is easyto control; the obtained barium carbonate iron sample has the characteristics of high purity, high crystallinity degree, chemical stability, insusceptibility to water absorption and the like; and thetechnical problem that the existing method for artificially synthesizing the barium carbonate iron and growing the monocrystal has defectiveness is solved.

The invention relates to a preparation method of a hollow sandwich-shaped iron-based negative electrode material. The preparation method comprises the following steps: (a) dispersing sulfonated polymer microspheres or fibers into a water solution containing Fe<3+>, heating for reaction, and drying, so as to obtain a first core-shell compound; (b) dispersing the first core-shell compound into a buffer water solution containing trismetyl aminomethane, adding dopamine under a stirring condition, carrying out polymerization reaction on the first core-shell compound, so as to obtain a sandwich-shaped polymerization compound; and (c) calcining the sandwich-shaped polymerization compound with a volatilizable sulfur source, selenium source or phosphorus source. The preparation method has the characteristics that the process is simple, the cost is low, the experimental conditions are easily controlled, and the method is easy to implement; and an adopted chemical reagent has low toxicity and does not have heavy burden to the environment.

The invention relates to a preparation method of an in-situ photo-reduction cuprous oxide / titanium dioxide compound. The preparation method comprises the following steps: (1) adding 0.1-0.3 part of titanium dioxide nano particles and 0.01-0.03 part of CuCl2<.>2H2O into 10 parts of methyl alcohol / aqueous solution according to mass part, and performing ultrasonic dispersion, wherein the volume ratio of methyl alcohol to water is (1 to 1) to (1 to 6); (2) performing nitrogen aeration treatment on a solution obtained in the step (1) for 10-15min, and under a condition of magnetic stirring, and performing illumination reaction 1.5-2 hours by a 500w high-pressure mercury lamp; (3) after the reaction is ended, centrifugating a product obtained by the reaction, washing the product by absolute ethyl alcohol for two to three times, and drying the product under a condition that the temperature is 60-90 DEG C for 24-30 hours to obtain an earthy yellow solid which is the final products. By the adoption of an ultraviolet deposition reduction method, the products are higher in dispersion and uniform in size; the photocatalysis activity is much higher than that of pure Cu2O or pure TiO2; under the illumination of visible light, dye organic matters can be efficiently degraded; the raw materials of the product are low in cost; a preparation process is environment-friendly; the preparation period is short, the cost is low, the benefit is high, and industrial popularization is facilitated.

The invention discloses a methyl acrylate (MA)-methyl methacrylate (MMA) copolymer-base denture base material as well as a preparation method and application thereof. The preparation method comprises the following steps: toughening a first monomer-MMA by a second monomer-MA; copolymerizing the two monomers in a suspension polymerization manner, wherein the MA monomer and the MMA monomer form an oil phase, the amount of the MA monomer is 1-10wt% of the mass of the oil phase, and the amount of the MMA monomer is 90-99wt% of the mass of the oil phase; evenly mixing the obtained copolymerization product with the heat-cured liquid for denture acrylic; and finally heating for curing. The MA-MMA copolymer-base denture base material is applied to the field of a denture base material; and compared with a purer PMMA (polymethylmethacrylate) material, the denture base material has the advantages of greatly improved bending strength, greatly improved impact strength and slightly improved tensile strength, thus successfully solving the problems of the PMMA denture base material in mechanical strength and particularly in impact strength.

The invention relates to a method for preparing a SiBCN-containing thermally-polymerisable ceramic precursor. The method comprises the steps of enabling vinyl dichlorosilane and hexamethyldisilazane, which are in a certain ratio, to react at a certain temperature, adding a certain amount of NaBH4 reducer into the reaction product for reduction after reaction is complete, then, adding dimethyl vinyl chlorosilane into the reduced reaction product to continue reaction, heating up the reaction product to distill off a solvent and some unreacted raw material molecules, finally, adding a solvent n-hexane into the reaction product to wash the reaction product, thereby obtaining a colorless viscous liquid product, i.e., the soluble and fusible SiBCN ceramic precursor. According to the synthesis method, the operation is simple and convenient, experimental conditions are easily controlled, experimental steps are reduced, the cost is low, the prepared SiBCN ceramic precursor is soluble and fusible, has good processability, is good in fluidity and can be subjected to thermal polymerization directly, the yield of the prepared product can reach 60% the input amount of chlorosilane, and the yield of sintered ceramics can reach 64%.

The invention relates to a method for testing the contents of gallic acid, salidroside, tyrosol and p-coumaric acid in Rhodiola rosea extracts. The method comprises the steps of respectively preparing a gallic acid reference sample solution, a salidroside reference sample solution, a tyrosol reference sample solution and a p-coumaric acid reference sample solution and preparing a Rhodiola rosea extract test solution; testing the content of the reference sample solutions with the chromatographic column of Phenomenex Luna C18 (4.6mm*250mm, 5mum), the moving phase of acetonitrile-0.3% glacial acetic acid, the column temperature of 40 DEG C, and the volume flow rate of 0.7mL.min-1 respectively at the wavelengths of 275nm and 308nm, recording the chromatogram map and calculating the contents of gallic acid, salidroside, tyrosol and p-coumaric acid in the Rhodiola rosea extract test solution.

The invention relates to a polyploid induction method for Chinese gooseberry Hort 16A offspring fine strain tissue culture seedlings. The polyploid induction method comprises the following steps: soaking leaves of the Hort 16A offspring strain tissue culture seedlings in a colchicine water solution to induce polyploidy, washing the leaves, and inoculating in callus differentiation enrichment culture medium and subculture culture medium for light culture according to the steps. The polyploid induction method is simple in operation, good in induction directionality, high in induction success rate, low in cost, shorter in culture period and higher in induction rate, an efficient and feasible new method is provided for polyploidy breeding of Chinese gooseberry, the polyploid induction method has important application values, through the popularization of the polyploid breeding method, economic benefits can be brought for fruit farmers, and demands of more consumers are met.

The invention discloses a method for preparing ferrodolomite under high temperature and high pressure, which comprises the steps of grinding and uniformly mixing analytically pure calcium carbonate, magnesium oxalate dihydrate, ferrous oxalate dehydrate powder and anhydrous oxalic acid according to stoichiometric molar ratio; pressing an obtained mixture into a cylindrical shape by a tablet press; putting a cylindrical sample into a platinum tube, sealing the two ends with a welding gun; taking h-BN as a pressure transmitting medium, putting the platinum sealed sample into an h-BN tube; assembling the sample loaded in the h-BN tube in a high-pressure synthesis assembly block, putting the sample in a six-faced top large press for high temperature and high pressure reaction; taking out the reacted sample, opening the platinum tube by a diamond cutter, naturally airing to obtain the ferrodolomite. The method provided by the invention solves the defects that the present ferrodolomit e preparation method is complex in operation process and long in reaction time, and the obtained sample is low in purity, poor in chemical stability and easy to absorb water.

The invention relates to a preparation method for a lithium battery positive electrode material lithium nickel manganese oxide. The preparation method comprises the following steps of (a), adding a lithium source, a nickel source and a manganese source into a solvent to be dissolved and mixed to obtain a first mixed solution, wherein the molar ratio of the lithium source to the nickel source to the manganese source is 10:5:9; (b), adding an oxidant and a mineralizing agent into the first mixed solution, and then moving the mixed solution to an autoclave, and reacting at the temperature of 150-230 DEG C for 48-72 hours; and (c), grinding the product obtained from the step (b) into powder and pressuring into flake-shaped, and then heating processed product in the air atmosphere at the temperature of 800-950 DEG C for 12-24 hours to obtain the lithium battery positive electrode material lithium nickel manganese oxide, wherein the mineralizing agent comprises a main mineralizing agent; the main mineralizing agent is KOH or / and NaOH; the molar ratio of the main mineralizing agent to the nickel source is 60-180:5; and the molar ratio of the oxidant to the nickel source is 6:5. The preparation method for the lithium battery positive electrode material lithium nickel manganese oxide is simple in synthetic process, low in cost, easy to control experiment conditions and convenient to realize the industrial production of the lithium nickel manganese oxide.

The invention discloses a borate-based red fluorescent powder used for a white light LED. The general chemical formula of the red fluorescent powder is Ln2-xMB8O16:xEu<3+>, wherein 0.001<=x<=2, Ln is one or more elements selected from La, Y, Gd and Lu, and M is one or more alkaline earth metals selected from Ca, Sr and Ba. A preparation method of the red fluorescent powder comprises following steps: taking raw materials according to the stoichiometry of the elements Ln, Eu, M and B of the general chemical formula; mixing the raw materials uniformly and adding the mixture into a corundum crucible; placing the corundum crucible in a sintering furnace; heating the corundum crucible to a temperature of 450 to 550 DEG C at a rate of 20 to 100 DEG C / h, and sintering for 5 to 24 h; cooling and taking the mixture out of the corundum crucible; grinding the mixture into powder; adding the powder into the corundum crucible again, placing the corundum crucible in the sintering furnace; heating the corundum crucible to the temperature of 800 to 1000 DEG C at the rate of 50 to 150 DEG C / h, and sintering for 24 to 72 h; cooling and taking the mixture out of the corundum crucible; grinding the mixture; and repeating the steps above for 2 to 3 times. The red fluorescent powder of the invention can be excited by near ultraviolet or blue light to emit red fluorescence, and is suitable for the white light LED excited by a near ultraviolet or blue light LED chip. Physicochemical properties and heat stability are excellent, production technologies are simple, synthesizing temperature is low, the raw materials are easily available, and cost is low.

The invention discloses a preparation method of double-layer Fe3O4@SiO2 magnetic composite nanoparticle. The ferrosoferric oxide nanoparticle is dispersed in trisodium citrate, treated in water bath,washed alternately with acetone and deionized water, and dried in vacuum to obtain ferric oxide particles; Fe3O4 particles are weighed and dispersed in ethanol solution, ethyl orthosilicate, ammonia water and water are added and react in a homogeneous reactor for 4 h to obtain a single-layer coated Fe3O4@SiO2 composite; the Fe3O4@SiO2 composite material is dispersed in ethyl alcohol, hexadecyl trimethyl ammonium bromide, ethyl orthosilicate, ammonia water and water are added and the raw materials react for 6 h in a homogeneous reactor, so as to obtain the double-layer coated Fe3O4@SiO2 magnetic composite nanoparticle. The invention adopts an improved Stober method to prepare double-layer Fe3O4@SiO2 magnetic composite nanoparticles, which have compact particle structure and good monodispersity.

The invention relates to an ion exchange polymer microsphere and a synthesis method thereof. The microsphere has a micron size, is internally composed of a hydrophobic polymer, and has a solid and compact structure; and the outer part is composed of a charged hydrophilic polymer and has a nano-porous structure. By changing the types of the hydrophobic polymer and the charged hydrophilic polymer, the chemical components and the surface appearance of the microspheres can be regulated and controlled. The microspheres have uniform size and morphology, the preparation method is simple, large-scale production is easy, and the microspheres have wide industrial application value. The ion exchange polymer microsphere with the micro-nano hierarchical heterostructure has great value in adsorption and separation of various molecules, ions and particles, and is expected to be applied to the fields of medicine purification, food detection, environmental governance and the like.

The invention relates to the field of new materials, in particular to a hollow core-shell structure Fe3O4@SiO2@PANI wave-absorbing agent and a preparation method. The preparation method comprises the following steps of 1, preparing Fe3O4 nanospheres, 2, activating the Fe3O4 nanospheres, 3, preparing Fe3O4@SiO2 with a core-shell structure, 4, purifying aniline monomers, and 5, preparing a Fe3O4@SiO2@PANI composite material. The preparation method provided by the invention is simple and convenient to operate, controllable in experimental condition, low in cost and suitable for various core-shell structure materials, experimental steps are reduced, the preparation method can be widely applied to preparation of multi-component core-shell structure wave-absorbing materials, the obtained Fe3O4@SiO2 / PANI composite material is clear in hollow core-shell structure, and nanoparticles are spherical.

The invention relates to a preparation method of a nano fiber containing TiO2 / WO3 heterojunction. The preparation method comprises the following steps of (1) adding soluble titanium salt into a mixed solvent of PVP (Poly Vinyl Pyrrolidone), absolute ethyl alcohol and acetic acid, and obtaining inorganic TiO2 nano fiber by adopting an electrostatic spinning and calcining method; and sequentially adding H2O2 and H2O in tungstic acid powder, and obtaining colorless and transparent WO3 sol; (2) preparing TiO2 nano fiber containing WO3 seed crystal by adding the TiO2 nano fiber into the WO3 sol; and (3) adding the WO3 sol, HMT (Hexamethylenetetramine) and water into the TiO2 nano fiber containing the WO3 seed crystal, and keeping warm for 6-12 hours under 120-180 DEG C; and drying a product which is obtained after hydrothermal in low temperature after centrifuging and water washing, and thus obtaining the nano fiber containing the TiO2 / WO3 heterojunction can be obtained. The preparation method disclosed by the invention is simple and practical, the composition of the TiO2 and the WO3 is more uniform and fuller, a large amount of contact interfaces can be formed, and the catalyzing ability can be increased.

The invention provides a manganese-zinc ferrite magnetic material with uniform particle size, regular particle morphology, and good dispersion. The material is a self-assembled submicron-level rod assembled by octahedral units, and has a structural formula of MnxZn1-xFe2O4, wherein x is no smaller than 0 and no greater than 1. In a reactant, a molar ratio of the elements are that (Mn+Zn) / Fe=1:2. Reaction medium mass / reactant total mass=0-6:1. The invention also provides a process for preparing the material. In the reaction process of the method, molten salt exists among produced manganese-zinc ferrite particles, such that particle agglomeration can be prevented. With the method provided by the invention, stoichiometric ratio of the components can be precisely controlled. The method also has the advantages of simple process, high-purity product, controllable particle morphology, no need of mechanical ball milling, no doping, narrow particle size distribution, wide raw material source, and the like.

The invention relates to a preparation method of an oil-water separation membrane used in strong acid, strong alkali and high salt environments. According to the preparation method, a piece of filter paper which servers as a supporting porous substrate is co-crosslinked with a hydroxyl-containing hydrophilic polymer to form a hydrogel coated network filter-paper membrane in a multi-network structure. Hydrogel coated network filter-paper membranes with different structures and different components can be prepared from filter paper with different pore sizes and different hydrophilic polymers with different molecular weights. The hydrogel coated network filter paper membrane prepared by adopting the preparation method can be used for oil-water separation in complex strong acid, strong alkali and high salt environments, is highly stable, is reusable and has a certain industrial application value, and the preparation method is simple, is low in preparation cost, is energy-saving and is environment-friendly.

The invention discloses photoresponse oil-water separation filter paper and a preparation method thereof. The preparation method comprises the following steps: using a dip-coating method, dipping filter paper in solution uniformly mixed with nano silicon dioxide particles, a photoresponse polymer, a curing agent and an organic solvent, dispersing by ultrasonic wave, taking and naturally airing or drying in vacuum, preparing the photoresponse oil-water separation filter paper. The provided preparation method is simple, the cost is low, and the stability is good. The prepared filter paper has the photoresponse performance, is capable of selectively performing the oil-water separation, and has good separation effect to different oil-water mixtures, and extensive application prospect.

The invention provides a method for controllably loading a precious metal nanometer material on a multi-walled carbon nanotube. The method comprises the following steps: dispersing the multi-walled carbon nanotube into hydrochloric acid, ultrasonically treating, centrifuging, and washing with water till being neutral, thereby acquiring a purified multi-walled carbon nanotube, and then vacuum-drying; dispersing the purified multi-walled carbon nanotube into a mixture of concentrated nitric acid and concentrated sulfuric acid, ultrasonically treating, centrifuging, and washing till being neutral, thereby acquiring a functionalized multi-walled carbon nanotube, and then vacuum-drying; dispersing the functionalized multi-walled carbon nanotube into deionized water, thereby acquiring a dispersion liquid; using an alkaline solution for adjusting pH of dispersion liquid, adding precious metal chemical complex and organic long-chain alcohol and stirring, thereby acquiring mixed liquid; puttingthe mixed liquid into a polytetrafluoroethylene lining reaction kettle, sealing and performing hydro-thermal treatment; centrifuging solid products, washing and vacuum-drying, thereby acquiring a precious metal / multi-walled carbon nanotube composite nanomaterial. The method provided by the invention has controllable experiment conditions and high repeatability and is expected to realize industrial application.