150results about How to "Won't reunite" patented technology

The invention provides a magnetic mesoporous silica gel material extracting agent used for enriching and / or separating trace organic pollutants in an environment water sample, and a preparation method thereof. A core of the extracting agent provided by the invention is a silicon gel microsphere (i.e. magnetic silicon gel microsphere) wrapped with a plurality of Fe3O4 magnetic nano particles, and a shell of the extracting agent is a mesoporous silicon gel shell layer with inner and outer surfaces modified by C18 silanization. The extracting agent integrates huge special surface area, excellent extracting capacity and ultrahigh extracting volume of a mesoporous material, magnetic separating capacity of a magnetic material, strong extracting capacity of C18 groups and special volume exclusion function of a vertical channel of the mesoporous material. In addition, the extracting agent provided by the invention has the advantages of high extracting efficiency, low preparation cost and simple preparation method, and is very suitable for preprocessing samples of the trace organic pollutants in a bulk-mass water sample.

The invention discloses a method for preparing a graphene oxide-chitosan composite material. The method includes the steps that a chitosan solution is prepared; secondly, a graphene oxide solution is prepared, a 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC) solution is added into the graphene oxide solution during stirring, stirring reaction is conducted after dropwise addition, then an N-hydroxyl succinimide (NHS) solution is dropwise added into the graphene oxide solution, stirring reaction is conducted, and an activated hydroxyl graphene oxide solution is obtained; thirdly, the activated hydroxyl graphene oxide solution is dropwise added into the chitosan solution and stirred, the mixture is poured into a mould after being cooled to room temperature, and the cross-linked graphene oxide-chitosan composite material is obtained after freezing drying. The novel graphene oxide-chitosan composite material having an interface bonding function is provided, compared with non-cross-linked composite materials, mechanical properties of the composite material are greatly improved, and use of the composite material in the aspect of the bone induction technology is achieved.

The invention discloses a method for preparing an antibacterial porous oxidized graphene / chitosan composite bracket. The method comprises the steps of taking carboxylated graphene oxide as an antibiotic carrier; carrying out electrostatic interaction by carboxyl on the surface of the oxidized graphene and amino on the antibiotic, so as to absorb the antibiotic on the oxidized graphene; taking the chitosan as the carrier of antibacterial metal ions, chelating the metal ions in chitosan molecules, restoring the metal ions into metallic single substances through a reducing agent; and finally mixing the carboxyl graphene with the antibiotic and the chitosan solution loaded with antibacterial metal, freezing and drying to obtain the composite bracket with two different antibacterial materials. The composite bracket can release antibiotic within a short period of time and release the antibacterial metal ions for a long period of time, and has short-term antibacterial and long-term antibacterial effects, and good antibacterial effect.

The invention relates to a method for preparing nano particles of elemental sulfur, belonging to the technical filed of chemistry and chemical industry. In the invention, a micro-emulsion method is utilized to prepare nano-sulfur particles and comprises the following steps: (1) evenly mixing surfactant, cosurfactant and oil phase, adding water solution of sulfur precursor to form micro-emulsion A, wherein the sulfur precursor is a compound capable of performing dismutation under acidic condition to generate the elemental sulfur; (2) evenly the mixing surfactant, the cosurfactant and the oil phase, then adding aqueous acid to form micro-emulsion B; and (3) mixing the micro-emulsion A obtained in step (1) and micro-emulsion B obtained in step (2), after the reaction ends, ageing, breaking emulsion, separating, washing and drying to obtain the nano-sulfur particles. The obtained product is orthorhombic system elemental sulfur, contains no impurity phase, and has evenly particle diameter distribution; and the particle diameter ranges from 10 to 400nm.

The invention discloses a preparation method of an electrocatalyst of direct methanol fueled battery. A carbon nano tube carrier is purified and activated, and then a solution of platinum or platinum-ruthenium mixture nano particles is prepared; the carbon nano tube and platinum or platinum-ruthenium mixture are mixed in a mass ratio of 1: 0.02 to 1: 0.80: firstly, the carbon nano tube is dispersed with glycol, and added with the platinum or platinum- ruthenium mixture nano particle solution, then treated by 200 to 500W ultrasonic for 1 to 5 hours, thus the electrocatalyst of the direct methanol fueled battery is prepared. The preparation method of the electrocatalyst of the invention does not need surfactant, stabilizer or functional molecule, metal particles do not congregate at normal temperature and are loaded on high density small grain diameter of the carbon nano tubes.

The invention discloses a synthesis method of a load type carbon modified titanium dioxide photocatalyst. The synthesis method comprises the following steps of mixing absolute ethanol and titanium tetrabutoxide to obtain a solution A; mixing HNO3 and absolute ethanol to obtain a solution B; adding the solution A into the solution B dropwise and adding NaOH solution dropwise to obtain titanium column brace liquid; adding cationic surfactant solution into natural bentonite solution dropwise to prepare organic modified bentonite turbid liquid; adding the titanium column brace liquid into the organic modified bentonite turbid liquid dropwise, ultrasonically oscillating and ageing to obtain powder; and calcining the powder under the vacuum condition to obtain load type carbon modified titanium dioxide. Carbon and TiO2 nanopaticles are implanted between the nano layers by utilizing the cation exchange characteristic of the bentonite to form a three-dimensional nanopore structure, so that the specific surface area of the bentonite is enlarged and the adsorption performance of the bentonite is enhanced. The TiO2 and the carbon particles are combined tightly on the surface, so that the surface photosensitivity of the TiO2 can be improved and the visible light degradability is improved. The TiO2 between the bentonite layers has nanosize, so that the nanoeffect can be exerted.

The invention discloses a preparing method of carbon material or nanometer silicon composite material and material through composite sintering method in the electrochemical technological domain, which is characterized the following: possessing stable structure with even particle diameter less than 1 mm; avoiding agglomeration among large amount of nanometer particles due to stronger action of surface to surface; displaying high reversible capacity and excellent circulating property.

The invention provides a preparation method of a graphene / modified titanium dioxide sol composite material. The preparation method is characterized by comprising the steps of: providing titanium dioxide nano sol and graphene; carrying out a reduction reaction under the action of mercapto carboxylic acid and sodium borohydride with auric chloride acid as a raw material, thiol as a surfactant and tetraoctyl ammonium bromide as a phase transfer agent to obtain modified gold nano sol; respectively dispersing the modified gold nano sol and the titanium dioxide nano sol in organic solvents, and mixing to obtain gold nano sol modified titanium dioxide sol; and mixing the gold nano sol modified titanium dioxide sol with a toluene solution of graphene, uniformly dispersing and filtering to obtain the graphene / modified titanium dioxide sol composite material. The modified titanium dioxide nano sol can be uniformly dispersed on the surface of graphene and does not agglomerate.

The invention provides a magnetic abrasive material and a method for preparing the magnetic abrasive material. The magnetic abrasive material is an acicular or spherical magnetic abrasive material with the structure of a core and a film, the core is a stainless pin or a stainless steel ball, and the film is ceramics. Through the method for preparing the magnetic abrasive material provided by the invention, a magnetic abrasive material which has strong polishing or grinding capacity and can form an ideal magnetic brush is obtained.

The invention relates to a preparation method of a graphene / polymer composite hydrogel thin film. The method comprises the steps of performing suction filtration on graphene aqueous dispersion to obtain a graphene hydrogel thin film by taking the graphene aqueous dispersion prepared through an oxidation reduction process as a raw material, and performing impurity removal on the prepared graphene hydrogel thin film by soaking; 2) transferring and soaking the graphene hydrogel thin film after impurity removal into an aqueous solution dissolved with polymeric monomers and initiators, and completing soaking for later use; 3) taking out the hydrogel thin film obtained in the step 2) from the solution, transferring into a reaction vessel, performing polymerization reaction by using the polymeric monomers, putting the hydrogel thin film into water after completing the reaction, soaking, and removing the unreacted polymeric monomers and initiators to obtain the graphene / polymer hydrogel thin film. The graphene / hydrophilic polymer composite hydrogel thin film obtained through the preparation method disclosed by the invention ensures that the specific surface area of graphene can maintain a relatively stable value in the composite hydrogel, and has higher application values.

The invention belongs to the technical field of metallic soap preparation and particularly relates to a method for preparing magnesium stearate by normal-pressure melting. The method comprises the following steps: reacting stearic acid with magnesium oxide in a special feeding way at normal pressure and temperature higher than the melting point of stearic acid; granulating or slicing the material obtained after reaction, thereby obtaining magnesium stearate with very high transparency. The method is low in device investment, small in environment pollution and high in product transparency.

The invention discloses a blood separating gel. The blood separating gel is prepared by uniformly mixing the following components in part by mass: 5-20 parts of SEBS, 20-60 parts of white oil, 15-60 parts of diethylhexyl phthalate, 1-20 parts of hydrophobic nano-silica and 0.5-5 parts of hydrophilic nano-silica, and the density of the separating gel is 1.030-1.075 g / cm<3> at 25 DEG C. The invention also provides a preparation method of the blood separating gel. The separating gel disclosed by the invention is stable, is convenient to use, has favorable thixotropy, is easy in centrifugation and good in separating effect, not only can bear irradiation sterilization of Gamma rays but also is insoluble in blood plasma or blood serum to interfere detection results, and causes less influence to the environment during medical waste incineration. The preparation method provided by the invention is simple, and is short in production period, high in efficiency, mature in process, easy to control and convenient to popularize.

The invention relates to a graphene preparation method, which comprises: 1, preparing a working electrode, wherein graphite is pressed on a stainless steel current collector so as to be adopted as a working electrode of a three-electrode system, 2, preparing intercalation graphite, wherein the three-electrode system is adopted to prepare intercalation graphite, 3, washing, wherein deionized water is adopted to wash the intercalation graphite, 4, carrying out vacuum drying, 5, carrying out microwave stripping, wherein the dried intercalation graphite is taken and added to an ion liquid according to a certain mass volume ratio, and the obtained mixture is placed into a microwave oven to carry out stripping, 6, washing, wherein filtration is performed by using organic solvent, and washing is performed by using deionized water until the pH value is neutral, and 7, carrying out vacuum drying. According to the present invention, the graphene preparation method has characteristics of simple operation and easy industrialization achievement, the yield of the graphene prepared by using the graphene preparation method is high, and the single layer rate of the graphene is up to more than 60%.

The invention discloses a method for constructing a three-dimensional electrocatalyst by using a phosphorus-doped nanosheet array. The nickel sulfide nanosheet array with di-functional activity growson large nickel foam with a three-dimensional porous structure, and then the activity in hydrogen evolution and oxygen evolution electrochemical reactions is improved through anionic phosphorus doping. According to the method, the nickel sulfide nanosheet array with di-functional activity grows on the large nickel foam with the three-dimensional porous structure, and then the activity in the hydrogen evolution and oxygen evolution electrochemical reactions is improved through anion-doped phosphorus. Noble metal is not contained, reaction conditions are relatively mild, the activity and conductivity of a catalytic material can be improved through anion doping, it is ensured that the structure of the three-dimensional structure is stable, a catalyst array cannot be agglomerated, and an organic binding agent does not need to be added during electrochemical testing.

The invention relates to a molybdenum carbide nanosheet, a method for preparing the same and application of the molybdenum carbide nanosheet. The method includes uniformly mixing molybdenum sources, ammonium nitrate and glycine with one another, and then heating the molybdenum sources, the ammonium nitrate and the glycine until the temperatures reach 160-180 DEG C so as to obtain mixtures 1; adding glucose into the mixtures 1 and then heating the glucose and the mixtures 1 until the temperatures reach 230-280 DEG C so as to obtain fluffy solid; placing the fluffy solid in hydrogen atmosphere and heating the fluffy solid until the temperature reaches 450-550 DEG C; cooling the fluffy solid to obtain the molybdenum carbide nanosheet. The molybdenum carbide nanosheet, the method and the application have the advantages that the heating temperatures are low when the molybdenum carbide nanosheet is prepared by the aid of the method, the method is convenient to implement and popularize, and prepared molybdenum carbide is free of agglomeration, is in the shape of an irregular sheet, has large specific surface areas and is excellent in catalytic performance during application to electro-catalytic hydrogen production.

The invention belongs to the technical field of modified inorganic nanometer functional materials and discloses a novel nano-fluid and its preparation method and an application thereof. The preparation method comprises the following specific steps: dissolving inorganic nanoparticles in water, adjusting pH to alkaline by adding alkali, carrying out ultrasound, adding the inorganic nanoparticle solution into a silane coupling agent ethanol solution to react for 4-48h so as to obtain a nanoparticle solution containing epoxy functional groups; adding tertiary amine and hydrochloric acid to react for 1-48h, adding polyoxyethylene ether sulfonate to react for 1-48h, and purifying to obtain the novel nano-fluid. The novel nano-fluid is a fluid-like shape. Processability of nanoparticles is raised. The novel nano-fluid also can be used as a special solvent and a reaction medium. The preparation method is simple and easy to operate. Modified nanoparticles will not be agglomerated. Physicochemical properties of nanoparticle kernel are still retained, and nano-fluids with different properties can be obtained by adjusting the type of inorganic nanoparticles and polymerization degree of polyoxyethylene ether sulfonate.

The invention provides a preparing method of a bismuthene nanosheet. The method comprises the steps that firstly, bismuth powder is dispersed in an organic solvent, and dispersion liquid is obtained;secondly, the dispersion liquid is subject to first-time water bath ultrasonic treatment, probe type ultrasonic treatment is carried out, first ultrasonic liquid is obtained, the first ultrasonic liquid is subject to second-time water bath ultrasonic treatment, and second ultrasonic liquid is obtained; thirdly, the second ultrasonic liquid is subject to ultra-low speed centrifugation under 2000 to4000 rpm, a liquid supernatant is collected, the liquid supernatant is subject to low-speed centrifugation under 5000 to 7000 rpm, sediment is collected, and the obtained sediment is the bismuthene nanosheet. The method is simple in process and easy to operate, reproducibility is good, and the controllable-size bismuthene nanosheet with the good single dispersibility is easily manufactured. The invention further provides the manufactured bismuthene nanosheet.

The invention provides a method for preparing a modified titanium dioxide nano particle nanotube. The method is characterized by comprising the following steps of: providing titanium dioxide nano sol; with chloroauric acid as a raw material, thiol as a surfactant and tetraoctyl ammonium bromide as a phase transfer agent, undergoing a reduction reaction under the action of thiol carboxylic acid and sodium borohydride so as to obtain modified golden nano sol; dispersing the modified golden nano sol and the titanium dioxide nano sol in an organic solvent respectively and then mixing to obtain titanium dioxide sol modified by the golden nano sol; and dropwise adding the titanium dioxide sol modified by the golden nano sol on the surface of an anodic aluminum oxide film, performing vacuum filtration, drying, calcining the composite anodic aluminum oxide film, removing the anodic aluminum oxide film, washing, and performing centrifugal separation to obtain the modified titanium dioxide nano particle nanotube. The modified titanium dioxide nano particle nanotube has a novel and stable structure, high specific surface area and excellent nano particle activity and is easily recovered and repeatedly used.

The present invention relates to an improved method for preparing an upcoversion nanocrystalline on a rare-earth adulterating fluoride which includes steps as follows: weighing rare-earth nitrates Ln(NO3)3 or rare-earth chlorides LnCl3, adding de-ionized water for confecting combined stock solution with 0.05-0.2 mol / l concentration; adding mesoporous molecular screen powder into the solution, ultrasonic treatment, mixing continuously, filtering, deposition bathing, drying; adding the obtained solid powder into fluor oligosol or ammonium fluoride water solution, stirring for reacting thoroughly; moving the reaction mixer into a reactor, water heat treating 8-48 hours under temperature 100-180 deg c; placing the product into a fluohydric acid solution to soak for removing molecular screen forwork, bathing and vacuum drying for obtaining upcoversion irradiancy nanocrystalline of rare-earth adulterating fluoride with less than 10 nm size. The upcoversion irradiancy nanocrystalline does not agglomeration and can obtain globular shape particle with uniform decentralized.

The invention discloses a functional nanocellulose-boron nitride composite film. A deposition layer is formed after suction filtration of a nanocellulose / boron nitride dispersion liquid on a mixed cellulose ester micro-porous filter membrane, and the deposition layer is hot-pressed and dried to form the inner layer of the composite film; and the inner layer of the composite film is a nanocellulose-boron nitride composite monolayer structure containing 1-7 wt% of boron nitride. The invention also discloses a preparation method of the composite film. The preparation method comprises: (1) mixing,stirring and ultrasonically crushing a nanocellulose dispersion and a boron nitride dispersion to obtain the nanocellulose-boron nitride dispersion; and (2) placing the obtained dispersion on the mixed cellulose ester filter membrane, carrying out vacuum suction filtration to form the deposition layer, removing the mixed cellulose ester filter membrane, and hot-pressing and drying the depositionlayer to obtain the inner layer of the composite film. The composite film provided by the invention has a high heat conduction coefficient and a high hydrophobic insulation performance, and can be widely used in the fields of electronic devices and biomaterials.

The invention discloses a process for preparing gold nano particles through reduction of chloroauric acid by catalase. The process comprises the steps of dropping a catalase solution into a chloroauric acid solution, and mixing uniformly; and adjusting the pH value of a mixed solution to be alkaline, reacting on the water bath condition of 20-37 DEG C, and obtaining gold nano particles through separation after the reaction is completed. According to the process, the catalase is introduced to serve as a reducing agent and a protective agent, reducing functional groups on the catalase are high in reducibility on the alkaline condition, the synthesis of gold nano particles is facilitated, and the produced gold nano particles are free from agglomeration on the high salinity condition (0.5MNaCl).

The invention relates to a method for preparing a magnetic adsorbent for methylene blue wastewater treatment. The method comprises the steps of 1, mixing FeSO4.7H2O with FeCl3.6H2O, dissolving the mixture in deionized water, conducting heating, adding ammonium hydroxide and sodium humate solution in sequence, conducting mechanical stirring, and reducing temperature to room temperature, so that humic acid modified nanometer Fe3O4 dispersion liquid is obtained; 2, conducting magnetic separation on the humic acid modified nanometer Fe3O4 dispersion liquid to obtain humic acid modified nanometer Fe3O4; 3, washing the humic acid modified nanometer Fe3O4 with absolute ethyl alcohol and deionized water in sequence till neutral, and conducting vacuum drying to obtain Fe3O4 / HA. The method is simple and easy to implement, and the obtained product is easy to separate and good in adsorption effect.

The invention discloses a method for preparing a hollow porous composite silicon-carbon material. With cuprous oxide as a sacrificial template, a three-dimensional zeolite imidazole framework grows on a cuprous oxide-coated nano-silicon particle surface; silicon monoxide is synchronously etched away; and then a silicon-carbon composite material with a hollow porous yolk-shell three-dimensional structure is obtained. According to the prepared hollow porous silicon-carbon material, a space for nano-silicon particles for expansion and shrinkage is reserved in a pyrolytic carbon shell, so that the condition that nano particles are not agglomerated is ensured; and most of SEI is formed outside the carbon shell and is relatively stable. The carbon shell formed by ZiF-8 pyrolysis has a lot of holes, so that the rate capability of the material is facilitated. Compared with the reported method for synthesizing the silicon-carbon material, the method disclosed by the invention has the advantages that the synthesis method is simple; the raw materials are cheap and available; and the prepared hollow porous silicon-carbon material has relatively good cycle performance and specific capacity.

The invention discloses a plant growth regulator containing nanometer titanium dioxide and a preparation method thereof, relating to a plant growth regulator and a preparation method thereof. The invention solves the problems of low use density, low absorption and utilization ratio and poor adhesive force of nanometer titanium in the existing plant growth regulator containing nanometer titanium dioxide. The growth regulator is prepared from the nanometer titanium dioxide, adhesive, water, dispersing agent, penetrating agent and additive. The preparation method is as follows: sequentially adding the adhesive, the penetrating agent, the dispersing agent, the nanometer titanium dioxide and the additive in water; continuously stirring for 1-2 minutes to obtain the plant growth regulator containing the nanometer titanium dioxide. The plant growth regulator of the invention can accelerate plant growth and is used for crop increment.

The invention discloses a preparation method of micrometer-scale cubic ultrodispersed ferroferric oxide particles. The preparation method comprises the following steps of: 101, dissolving a trivalent ferric salt and a divalent ferric salt in deionized water to form reaction liquid; 102, adding hydrogen peroxide to the reaction liquid, dropwise adding an alkaline solution, and regulating the pH value of the reaction liquid to 9-10 to form suspension liquid; 103, feeding the suspension liquid to a stainless steel reaction kettle with a tetrafluoroethylene base pad, putting the stainless steel reaction kettle into a drying box, reacting for 12h, and then cooling to room temperature to obtain ferroferric oxide particles; 104, washing the ferroferric oxide particles by using deionized water and drying the particles; and 105, putting the ferroferric oxide particles obtained in the step 104 in a muffle furnace to obtain the ferroferric oxide particles. The ferroferric oxide particles prepared by using the preparation method disclosed by the invention have micrometer-scale size, regular cubic shape and good dispersibility.

The invention provides a preparation method of bamboo joint structure Mn2O3. According to the method, at first, rod-metal organic framework material Mn-MOF precursors are prepared by a guide agent assisting solvent volatilization method; then, in the air environment, the Mn-MOF precursors are calcined; the calcining temperature is controlled to be 400 to 650 DEG C; the time is 2 to 4h; finally, the materials are cooled to the room temperature along with the furnace temperature; the bamboo joint structure Mn2O3 nanometer structure materials can be obtained. The method provided by the invention has the advantages that the operation is simple; the process cost is low; the appearance is regular; the product stability is high, and the like. The industrial production is facilitated. The bamboo joint structure Mn2O3 nanometer structure material obtained by the method has the advantages of good conductivity and great specific surface area; the electrode resistance can be favorably reduced; the materials can be used for supercapacitor electrode materials.

The invention discloses nitrogen-doped graphene for in-situ growth of a self-assembled denitration sulfur-resistant catalyst, and a preparation method thereof. The preparation method comprises the following steps: taking graphene oxide as a precursor, preparing modified nitrogen-doped graphene from 2,4,6-triaminopyrimidine and cyanuric acid, and growing a ternary Mn-Ce-SnOx catalyst on the surfaceof the modified nitrogen-doped graphene as a catalyst carrier in situ. The self-assembled ternary Mn-Ce-SnOx catalyst is uniformly and firmly loaded on the surface of the modified nitrogen-doped graphene in a surface in-situ growth manner, so that the obtained composite material has good sulfur resistance while having efficient denitration capability.

The present invention relates to a silicone sealant, which comprises alpha, omega-dihydroxy polydimethylsiloxane, a calcium carbonate filler, a polycarboxylic acid water reducing agent, a cross-linking agent, a coupling agent and a catalyst, wherein the molecular structure of the polycarboxylic acid water reducing agent comprises an active group-containing main chain and a plurality of side chains, the active group can be bonded with the calcium carbonate filler, and the mass ratio of the alpha, omega-dihydroxy polydimethylsiloxane to the calcium carbonate filler is 1:(1.4-2). The invention also relates to a preparation method of the silicone sealant. The invention further relates to a photovoltaic module sealed and assembled by the silicone sealant.

The invention discloses a bivalent nickel ion activated near-infrared long afterglow nano material which takes ZnGa2O4 as a base material and is doped with 0.1 mol%-5 mol% of Ni. The invention further discloses a preparation method of the near-infrared long afterglow nano material. The method comprises the steps that 1, zinc acetate, gallium nitrate and nickel nitrate serve as the raw materials, the raw materials are added into a mixed solution of water and ethyl alcohol and stirred at room temperature, acetylacetone is added, the mixture is stirred at room temperature, and a mixed solution is obtained; 2, the mixed solution is dried, and wet gel is obtained; 3, a mixed solution of n-butyl alcohol and ethyl alcohol is added into the wet gel, reacting and drying are conducted in sequence, and dried gel is obtained; 4, the dried gel is ground and then transferred into a crucible, burning is conducted in a smelting furnace at 900 DEG C to 1,200 DEG C for 2 h, and a power material is obtained. The afterglow bandwidth of the near-infrared long afterglow nano material ranges from 1,050 nanometers to 1,600 nanometers, the afterglow peak is located at 1,250 nanometers to 1,350 nanometers, and the bivalent nickel ion activated near-infrared long afterglow nano material can be well applied to the field of bioimaging.

The invention provides a preparation method of modified titanium dioxide nano-sol comprising the following steps: providing titanium dioxide nano-sol, reducing chloroauric acid by taking the chloroauric acid as the raw material, the dodecanethiol as the surfactant, the tetraoctylammonium bromide as the phase transfer agent and the boron-hydrogen compound as the reductant under the action of the thiol carboxylic acid and the dodecanethiol to obtain modified gold nano-sol, dispersing the gold nano-sol and the titanium dioxide nano-sol in an organic solvent respectively, and mixing to obtain the titanium dioxide nano-sol modified by the modified gold nano-sol. The preparation method provided by the invention can be used for preparing the modified titanium dioxide nano-sol which has a uniform particle size, good dispersibility and good chemical and thermal stability. The invention further provides the modified titanium dioxide nano-sol.