39 results about "Bismuth doping" patented technology

The invention relates to a bismuth-doped metal sulfide nanoflower and a preparation method thereof. The preparation method comprises the steps that a solution system containing both intermediate particles and ammonium thiomolybdic tetrahydrate is subjected to a solvothermal reaction to obtain the bismuth-doped metal sulfide nanoflower; the intermediate particles are generated by mixing an A solution and a B solution, wherein the A solution is mainly composed of BiCl3, MnCl2 4H2O and deionized water, and the B solution is mainly composed of K4[Fe(CN)6] 3H2O, citric acid and deionized water; thefinally prepared bismuth-doped metal sulfide nanoflower is of a nanoflower structure formed by winding and twisting nanosheets, wherein the nanosheets are doping type metal sulfide nanosheets obtained through mutual substitution and mosaicism of elemental bismuth, bismuth sulfide, manganese sulfide, ferrous sulfide and molybdenum sulfide on a two-dimensional structure. The preparation method is simple, the prepared nanoflower can achieve the effect that a single structure has multiple functions, and the photothermal conversion efficiency is higher.

The invention discloses a preparation method of a bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst. The mehod comprises the following steps: adding graphite phase carbon nitride into an acetic acid solution, stirring, and carrying out ultrasonic treatment; adding bismuth chloride and sodium metavanadate into the solution; adjusting the pH value of the solution to 5-7; heating the mixed solution at 160-200 DEG C to react for 8-20 hours; and centrifugally separating, washing, and drying to obtain the catalyst. According to the invention, according to the characteristics that graphite-phase carbon nitride is non-toxic, easy to prepare, stable in thermodynamic and chemical properties, high in photocatalytic reducibility, narrow in bismuth vanadate band gap width, high in photocatalytic oxidation, capable of responding to visible light and having energy level difference, and the like, a bismuth vanadate doped graphite-phase carbon nitride nano composite materialis constructed, wherein the photon-generated carrier separation efficiency is remarkably improved, the recombination rate is greatly reduced, the response range of the material to visible light is further widened, and the oxidation-reduction capability is enhanced, so that the photocatalytic performance is further improved, and the composite material can be used for removing organic pollutants inthe environment and reducing CO2.

The invention discloses a series of three-dimensional lead-free all-inorganic bismuth-doped silver-indium-based double perovskite materials. The preparation method comprises the following steps: adding cesium chloride, a silver chloride-containing compound, a bismuth-containing compound and an indium-containing compound into a reaction kettle, adding concentrated hydrochloric acid, and reacting at160-180 DEG C for 15 hours; and after the reaction is finished, cooling to room temperature, carrying out rapid suction filtration, putting the obtained crystal into a vacuum oven, and keeping the temperature at 60+ / -5 DEG C for 12 hours. The preparation method is simple, the toxicity problem of lead-based perovskite is solved, and the stability of organic and inorganic perovskite is improved. According to the invention, the three-dimensional lead-free all-inorganic bismuth-doped silver-indium-based double perovskite material as single warm white light fluorescent powder covers a commercial ultraviolet light emitting diode to assemble into a warm white light emitting diode device, so that a good application prospect is achieved in the photoelectric field.

The invention relates to the technical field of nano materials, in particular to a preparation method of a bismuth-doped bimetallic sulfide electrode for electrocatalytic oxidation of urea. The methodcomprises the following steps of: (1) dissolving a cobalt source, a nickel source, a bismuth source and an organic ligand in deionized water to obtain a mixed solution, adding a conductive substrate,carrying out hydrothermal reaction, taking out the conductive substrate, and performing washing and drying; and (2) carrying out vulcanization treatment in a nitrogen atmosphere to obtain the bismuth-doped bimetallic sulfide urea oxidation electrocatalyst. The preparation method has the advantages that the raw material cost is low, the synthesis process is simple, the reaction conditions are easyto achieve, the prepared self-supporting efficient urea oxidation electrocatalytic material heterojunction nanosheet array is uniform in size, stable in structure and uniform in component distribution, and the material is endowed with better electrocatalytic performance and stability; the urea oxidation electrocatalyst grows on a conductive substrate in situ, becomes a flexible and self-supporting material, can be directly used as a catalyst, and does not need to be coated on an electrode.

The invention relates to a preparation method of a cathode material for a high-power alkaline manganese battery. The preparation method comprises the following steps of: dissolving a manganese salt solution, a bismuth salt solution and a template agent in water by using inorganic manganese salt as a raw material, mesoporous silicon dioxide as the template agent and bismuth salt as a doping agent, uniformly mixing, attaching the manganese salt onto a template by a liquid phase immersion method, and drying the solution; and calcining to ensure that the manganese salt is subjected to an oxidation reduction reaction to generate bismuth-doped mesoporous manganese dioxide, removing the template by using a sodium hydroxide solution, filtering for separation, washing by using distilled water, precipitating, drying, and thus obtaining a bismuth-doped mesoporous manganese dioxide electrode material. The bismuth-doped mesoporous manganese dioxide electrode material prepared by the method is used as the cathode material for the high-power alkaline manganese battery and has a discharging property which is much more than the property of the conventional manganese dioxide, so that the utilization rate of an active ingredient in the cathode material of the alkaline manganese battery is greatly improved.

The invention provides bismuth doped Si-Al-B based optical glass and a preparation method thereof. The optical glass is characterized by comprising the following glass matrixes based on molar percentage: 44 to 55 percent of strontium oxide, 20 to 29 percent of aluminum oxide, 20 to 29 percent of diboron trioxide, 0.1 to 5 percent of dibismuth trioxide, and 0.5 to 1 percent of silicon dioxide or lithium carbonate which is added into the glass matrixes as a fusion aid. The fusion temperature of the glass is obviously reduced compared with quartz glass; and the glass has optical performance covering an ultra-wide band of a communication waveband between 1,000 and 1,600nm , and is expected to be applied in the technical fields of an ultra-wide band optical amplifier, a high power laser, a tunable laser and the like.

The invention discloses a near-infrared luminescence bismuth-doped multi-component fiber, comprising fiber core glass and cladding glass. The fiber core glass comprises La2O3,Y2O3, Lu2O3,Ga2O3, In2O3, BaO, Bi2O3, and GeO2; and the cladding glass comprises La2O3,Y2O3, Lu2O3,Ga2O3, In2O3, BaO, and GeO2. The invention also discloses a near-infrared luminescence bismuth-doped multi-component fiber preparation method which employs the rod-in-tube technique for preparation. The fiber can be prepared under a low temperature, avoid bismuth volatilization, and realize bismuth high density doping and high efficiency luminescence; an optimum doping concentration is 5-7 mol%, which is three magnitude orders higher than the bismuth doping concentration in a quartz optical fiber; the fiber covers 1000-1600 nm, and has a luminescence half-width greater than 200 nm.

The invention discloses a zinc cadmium sulfur-bismuth doped halloysite composite photocatalyst and a preparation method thereof. In the zinc-cadmium-sulfur-bismuth-doped halloysite composite photocatalyst, the halloysite has a nanotube structure, and the zinc-cadmium-sulfur is dispersedly grown on the surface of the bismuth-doped halloysite. The invention adopts a one-step solvothermal method to prepare the modified bismuth-doped halloysite, which is ultrasonically compounded with zinc, cadmium and sulfur to form a composite photocatalyst. The zinc-cadmium-sulfur-bismuth-doped halloysite composite photocatalyst of the present invention has good dispersion and many active sites, is used for photocatalytic degradation of 10mg / L rhodamine B, exhibits excellent catalytic performance, and the degradation rate reaches More than 85%.

A method for improving near-infrared fluorescence intensity of bismuth-doped quartz glass comprises the following steps: heating bismuth-doped quartz glass to a molten state of 1600-1700 DEG C through high-temperature heat treatment, and keeping the temperature for 1-10 minutes; quickly putting the melt into different cooling liquids, completely soaking, and quenching; and then taking out the glass, and polishing the quenched glass to obtain the fluorescence-enhanced bismuth-doped quartz glass. The high-temperature heat source comprises a graphite furnace and oxyhydrogen flame. The cooling liquid comprises deionized water, dry ice, liquid nitrogen, liquid helium and the like. The method is favorable for improving the concentration of a bismuth-related active center in the Bi-doped quartz glass, so that the fluorescence intensity of the near-infrared band carried by the bismuth-doped quartz glass is enhanced. The material can be widely applied as a gain medium of a Bi-doped fiber laser and an optical amplifier.

The invention discloses a preparation method and application of a two-dimensional layered bismuth oxychloride-Fe doped and modified photocatalytic material. Pure BiOCl and Fe doped and modified BiOClare prepared by adopting a novel molten salt (NaNO3 and KNO3) method. The preparation method comprises the following steps: weighing NaNO3 and KNO3 according to a certain mass ratio, carrying out mixed grinding, adding Bi (NO3) 3-5H2O, KCl and Fe (NO3) 3-9 (H2O) into the mixed salt, and carrying out uniform mixed grinding; and putting the mixed and ground powder into an aluminum oxide crucible, and carrying out heat treatment to finally obtain Fe-doped modified BiOCl. The method has the advantages of low cost, high efficiency, environmental friendliness, safety, convenience, simple process andthe like, and the obtained Fe-doped modified BiOCl material is of a typical layer-layer structure, has more surface active regions, and has visible light response and stable photocatalytic performance so that the Fe-doped and modified BiOCl material has an important potential application value in preparation of a novel photocatalyst.

The invention discloses a bismuth-doped rare earth iron garnet single crystal film, a preparation method thereof and an optical device, and the method comprises the following steps: putting a single crystal component and a cosolvent into a platinum crucible, and heating to melt the single crystal component and the cosolvent; the temperature of the melt in the platinum crucible is reduced to the initial growth temperature, so that the single crystal component is gradually deposited on the surface of a single crystal substrate arranged in the platinum crucible; in the deposition process, the platinum crucible and the single crystal substrate are controlled to rotate reversely, and the rotating direction of the platinum crucible and the rotating direction of the single crystal substrate are converted according to a preset first period; and moving the single crystal substrate by a set distance along the depth direction of the melt according to a preset second period, and uniformly depositing the melts at different depths on the single crystal substrate to form the bismuth-doped rare earth iron garnet single crystal film, according to the preparation method, the single crystal thin film with more uniform magneto-optical performance and optical performance can be prepared, the Faraday coefficient of the single crystal thin film is improved by improving the effective replacement amount of bismuth under the condition that the large film thickness is not needed, and the cracking risk of the single crystal thin film is reduced.

The invention provides a method for preparing bismuth-doped lanthanum tin gallate yellow phosphor for AlGaN chips, and a method for preparing bismuth-doped lanthanum tin gallate yellow phosphor for AlGaN chips. The compound is used as a raw material, after being ground and mixed, it is pre-fired in the air atmosphere, taken out, ground and mixed, and burned in the air atmosphere to obtain the yellow phosphor La 3 SnGa 5 o 14 : Bi 3+ , the present invention does not use rare earth as the luminescent center, and uses cheap bismuth as the activator; the present invention has ultra-broadband emission covering the interval of 330nm to 800nm ​​under the excitation of ultraviolet light, and the half maximum width is 300nm; in addition, the preparation process of the present invention is simple , does not use harsh preparation conditions, such as high temperature and high pressure, can be prepared under normal pressure, and is easy to scale production; and the excitation band is located in the ultraviolet region, avoiding the overlap with the excitation light, and there is no reabsorption problem.

The invention discloses a multi-element-doped titanic acid nano short tube preparation method. According to the preparation method, the sol-gel method is utilized to prepare bismuth-doped titanium dioxide nano-particles; then, the hydrothermal method is adopted to prepare a boron-cobalt-bismuth-doped titanic acid nanotube; finally, the ultrasonic wave and microwave synergetic and composite effect is adopted to cut off the boron-cobalt-bismuth-doped titanic acid nanotube. According to the invention, the ultrasonic wave and microwave synergetic and composite effect is adopted to cut off the boron-cobalt-bismuth-doped titanic acid nanotube so as to obtain the boron-cobalt-bismuth-doped titanic acid nano short tube with uniform lengths, and the minimum length of the boron-cobalt-bismuth-doped titanic acid nano short tube can reach 20 nm.

The invention relates to a preparation method for a composite fluorescent glass cover, and belongs to the technical field of lamp illumination. According to the method provided by the invention, bismuth-doped Y2O3:Eu<3+> fluorescent powder is synthesized, and the situation that 6s<2> -> 6s6p of a bismuth ion belongs to electric dipole allowed transition to overcome the problem that transition absorption intensity in 4f configuration of a rare earth ion is lower; Bi<3+> has a sensitization effect on Eu<3+>, the Bi<3+> is used as a light-emitting sensitizer, near-ultraviolet absorption of a Bi<3+> charge transfer band is utilized to effectively transfer absorbed energy to an excited state energy level of the rare earth ion, so that the effective utilization capability of exciting light is improved, and the fluorescence light-emitting intensity of the Eu<3+> is enhanced; a fluorescent powder material is fully dispersed into a glass matrix to solve the problem of uniformity of coating of the fluorescent material; and a zinc tellurate / zinc aluminate glass substrate is used to replace epoxy resin or a silica gel to be used as a packaging material, so that the problems that white light isshifted and a halo effect appears because the epoxy resin or the silica gel is subjected to aging yellowing can be effectively solved.

The invention relates to a synthesis method for preparing a bismuth-doped lithium silicate positive electrode material by taking iron tailing as a raw material. The synthesis method comprises the steps of firstly, preparing a sodium silicate solution by taking the iron tailing as the raw material; secondly, adding ferrous nitrate into the sodium silicate solution to obtain a ferrous nitrate precipitant; thirdly, mixing lithium oxide and Fe2O3 with the precipitant; and finally, performing calcination and cooling to obtain a bismuth-doped lithium silicate sample. The lithium silicate system material is an important lithium battery positive electrode material, and the method has very important significance to integrated utilization of the iron tailing, environmental protection, and promotionon development of high and new technology.

The invention discloses a near-infrared luminescent bismuth doped strontium chloro-pentaborate crystal and a preparation method thereof. The general formula of the crystal is Sr2(1-x)B5O9Cl : 2xBi, 0.1% <= x <= 3.0%. respectively weighing strontium containing, boron containing, chlorine containing and bismuth containing compounds as raw materials; preforming pre-burning at 623-823 K for 3-6 hoursafter the raw materials are uniformly ground, performing cooling to room temperature, and performing grinding and well mixing; and performing calcining at 1,073-1,173 K for 4-6 hours, performing reaction for 15 min - 10 hours under a reducing atmosphere of 1,073-1,173 K on an obtained sample after performing cooling to the room temperature, and performing grinding to obtain the crystal after performing cooling to the room temperature. The near-infrared fluorescence full width at half maximum is greater than 200 nm and wider than the luminescence of rare earth ions, and has longer fluorescencelifetime, so that the crystal can be taken as a laser gain medium and applied to the fields of ultra-wideband wavelength tunable novel laser sources or ultrashort pulse lasers.

The invention discloses a preparation method of a bismuth-doped tin oxide / bismuth phosphate composite photocatalyst. 3 ) 3 ·5H 2 O is dissolved in dilute nitric acid solution to obtain a clear and transparent solution A. 2 SnO 3 ·4H 2 O is dissolved in deionized water to obtain solution B, and solution B is added dropwise to solution A under stirring to obtain solution C, and Na 2 HPO 4 ·12H 2 O is dissolved in deionized water to obtain solution D, and then solution D is added dropwise to solution C under stirring conditions, and deionized water is added to make the total volume of the mixed system 30 mL, and the solution is loaded into a 50 mL autoclave, The hydrothermal reaction was placed in a constant temperature oven at 180 °C for 24 hours. After the autoclave was cooled to room temperature, the reaction solution was centrifuged. After washing, it was placed in a constant temperature drying box at 60 °C and dried for 12 hours to obtain a bismuth-doped tin oxide / bismuth phosphate composite light. catalyst. The composite photocatalyst prepared by the invention has wide absorption spectrum range, stable performance, high efficiency, non-toxicity and low cost, and can be used for efficiently degrading difficult biodegradable organic pollutants.

The invention relates to a copper-selenium-based thermoelectric material with high structural stability and a preparation method thereof, belonging to the research field of thermoelectric materials. The chemical formula of the thermoelectric material is Li y Cu 1.85‑x Bi x Se, where x is [0.02, 0.05], and y is [0.01, 0.03]; the present invention obtains Cu with stable cubic phase structure only by changing copper (Cu) vacancies 1.85 Se-based thermoelectric materials. On this basis, by filling copper (Cu) vacancies with lithium (Li) and doping with bismuth (Bi) to adjust the thermoelectric parameters of the material, Li with greatly improved thermoelectric performance was obtained. y Cu 1.85‑ x Bi x Se thermoelectric material, compared with pure phase Cu 1.85 Se-based thermoelectric materials are improved by at least 3 times without changing the structural transition characteristics of the samples. The present invention has very important promotion significance for the inhibition of phase transition of the copper-based sulfide-based thermoelectric material in practical applications.

The invention discloses a preparation method of a bismuth-doped tin oxide photocatalyst capable of efficiently degrading dye and antibiotic wastewater. 0.5-6mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 15mL dilute nitric acid solution to obtain a transparent and clear solution A, and then 3mmol Na 2 SnO 3 4H 2 O was dissolved in 5mL deionized water to obtain solution B, then solution B was added to solution A under stirring conditions, deionized water was added to make the total volume of the mixed system 30mL, and the mixed system was transferred to 50mL polystyrene after stirring for 30min. In a vinyl fluoride reaction kettle, put it in a constant temperature oven at 180°C to react for 24 hours. After the reaction is completed, it is naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol in turn, and then dried in a constant temperature oven at 60°C for 12 hours to obtain bismuth doped Hybrid tin oxide photocatalyst. The bismuth-doped tin oxide photocatalyst prepared by the invention has wide absorption spectrum range, stable performance, high efficiency, non-toxicity and low cost, and can be used for efficient degradation of refractory organic pollutants.

The invention relates to a double-window temperature rise infrared collection and detection device for gas switch equipment. The double-window temperature rise infrared collection and detection deviceis mainly and technically characterized by comprising a germanium glass probe, a bismuth-doped glass sheet, a pyroelectric detection array, a fixing piece, an airtight flange and an aviation plug, the pyroelectric detection array is installed in the ring fixing piece, the bismuth-doped glass sheet and the germanium glass probe are located above the pyroelectric detection array and installed on the fixing piece, and the focal plane of the germanium glass probe is attached to the light receiving face of the pyroelectric detection array. A back plate of the pyroelectric detection array is provided with a power line and a signal feeder line and is led out from the airtight flange through an aviation plug; and the airtight flange fixes the germanium glass probe, the bismuth-doped glass sheet and the pyroelectric detection array at the opening of the shell of the gas switch equipment through fixing pieces. The device is reasonable in design, achieves the precise monitoring of the abnormal temperature rise of a key position in the device, is small in size, is large in field of view, and is high in sensitivity.

Relates to a preparation method of bismuth-doped silver sulfide quantum dots with near-infrared second-region fluorescence / photo-thermal performance. The invention aims to solve the problem that the photo-thermal conversion efficiency is low when silver sulfide quantum dots are used as single-component diagnosis and treatment nanoparticles for near-infrared two-region fluorescence imaging guided photo-thermal therapy. The preparation method comprises the following steps: 1, fully mixing an AgNO3 solution and a Bi (NO3) 3.5 H2O solution with an albumin solution to prepare a metal ion-albumin compound; 2, adjusting the pH value of the obtained metal ion-albumin composite solution to 1-13, adding a Na2S. 9H2O solution, and reacting at 50-60 DEG C for 4-6 hours; and 3, dialyzing with ultrapure water for 24-48 hours to obtain the bismuth-doped silver sulfide quantum dots. The bismuth-doped silver sulfide quantum dots are synthesized in a water phase, the preparation process is simple, the reaction is mild, and the prepared bismuth-doped silver sulfide quantum dots not only have good near-infrared two-region fluorescence imaging capability, but also have high photothermal conversion performance, and have great potential in the aspect of being used as single-component diagnosis and treatment nanoparticles.

The invention belongs to the technical field of gain optical fibers, and discloses a bismuth-doped multi-component glass optical fiber used as a gain medium and a preparation method of the bismuth-doped multi-component glass optical fiber. The method comprises the following steps: melting, pouring, annealing and cooling raw materials, processing the raw materials into a fiber core glass rod, and placing the fiber core glass rod in a hollow cladding to prepare a preform; and drawing the preform rod into the optical fiber. The bismuth-doped multi-component glass optical fiber is composed of a fiber core and a cladding. The fiber core is mainly prepared from the following raw materials in percentage by mole: 10 to 40 percent of GeO2, 20 to 30 percent of Al2O3, 8 to 20 percent of MgO, 0.3 to 1 percent of Bi2O3 and the balance of SiO2. The glass optical fiber disclosed by the invention has the characteristics of high bismuth doping concentration, obvious optical fiber amplified spontaneous emission effect and the like, and can cover a near-infrared band of 1.1-1.5 microns; and the optical fiber can be welded with commercial silica optical fibers. The bismuth-doped multi-component glass optical fiber is used as a gain medium in an optical amplifier and an optical fiber laser.

The invention relates to the technical field of nanomaterials, in particular to a method for preparing a bismuth-doped bimetallic sulfide electrode for electrocatalytic oxidation of urea, comprising the following steps: (1) combining a cobalt source, a nickel source, a bismuth source and an organic compound with a The body is dissolved in deionized water to obtain a mixed solution, added to a conductive substrate, and subjected to a hydrothermal reaction to take out the conductive substrate, washed and dried; (2) Sulfide treatment in a nitrogen atmosphere to obtain bismuth-doped bimetallic sulfide urea oxidation Electrocatalyst. The invention has low cost of raw materials, simple synthesis process, easy to achieve reaction conditions, and the prepared self-supporting high-efficiency urea oxidation electrocatalytic material heterojunction nano-sheet array has uniform size, stable structure and uniform component distribution, and gives the material better performance. Electrocatalytic performance and stability; the urea oxidation electrocatalyst of the present invention is grown on a conductive substrate in situ, making it a flexible and self-supporting material, which can be directly used as a catalyst without coating on an electrode.

The invention relates to a copper-and-selenium-based thermoelectric material with high structural stability and a preparation method thereof, belonging to the field of thermoelectric material research. The chemical formula of the thermoelectric material is Li<y>Cu<1.85-x>Bi<x>Se, x is [0.02, 0.05], and y is [0.01, 0.03]. According to the invention, the Cu<1.85>Se-based thermoelectric material with a stable cubic phase structure is obtained only by changing the vacancy of copper (Cu); and on the above basis, the thermoelectric parameters of the material are adjusted by filling the copper (Cu) vacancy with lithium (Li) and doping bismuth (Bi), so the Li<y>Cu<1.85-x>Bi<x>Se thermoelectric material with greatly improved thermoelectric performance is obtained, the thermoelectric performance is at least improved by 3 times compared with the thermoelectric performance of a pure-phase Cu<1.85>Se-based thermoelectric material, and the structural transformation characteristics of a sample are not changed. The method has very important promotion significance in practical application for phase change inhibition of the copper-group sulfide-based thermoelectric material.

The invention discloses a zinc cadmium sulfur-bismuth doped indianite composite photocatalyst and a preparation method thereof. In the zinc cadmium sulfur-bismuth doped indianite composite photocatalyst, indianite is of a nanotube structure, and zinc cadmium sulfur is grown on the surface of the bismuth doped indianite in a dispersion manner. The modified bismuth doped indianite is prepared by using a one-step solvent thermal method, and is subjected to ultrasonic compounding with zinc cadmium sulfur to form the composite photocatalyst. The zinc cadmium sulfur-bismuth doped indianite compositephotocatalyst disclosed by the invention is good in dispersibility and rich in active site, is adopted for photocatalysis degradation on 10mg / L of rhodamine B, has excellent catalysis properties andhas a degradation rate up to 85% or greater within 60 minutes.

The invention discloses a near-infrared luminescent tin-bismuth doped aluminosilicate glass optical rod, which belongs to the technical field of glass optical rod preparation, and comprises the following components in mole percentage: 39-64% of SiO2, 10-30% of Al2O3, 25-30% of CaCO3, 0.1-2% of Bi2O3 and 0.2-1% of SnO2. The invention further discloses a preparation method of the near-infrared light-emitting tin-bismuth-doped aluminosilicate glass optical wand. By adding calcium carbonate, the preparation temperature is reduced, so that the preparation method has obvious advantages; by reasonably adjusting the formula of the matrix, co-doping bismuth, aluminum and tin ions and adjusting the concentration of doped ions, the ultra-wideband luminescent material which is simpler in preparation method and good in luminous efficiency is obtained.

The invention discloses a preparation method of environmental photocatalytic nanomaterials. This method uses a sol-gel method to prepare bismuth-doped titanium dioxide nanoparticles, then uses a hydrothermal method to prepare titanate nanotubes co-doped with sulfur, tungsten, and bismuth elements, and finally cuts off the sulfur, tungsten, and bismuth elements by the synergistic combined effect of ultrasonic and microwave. Co-doped titanate nanotubes. The method of the present invention uses the synergistic combined effect of ultrasonic and microwave to cut titanate nanotubes co-doped with sulfur, tungsten and bismuth elements. The obtained short titanate nanotubes co-doped with sulfur, tungsten and bismuth elements are uniform in length, and the shortest length can reach 20nm. .