124 results about "Bismuth phosphate" patented technology

The invention discloses a preparation method of bismuth phosphate (BiPO4) photocatalysts differing in structure, and adopts a hydrothermal method. The preparation method comprises the following steps of: 1) dissolving Bi(NO3)3.5H2O in a solvent to obtain a solution A; 2) dissolving Na2HPO4.12H2O in a solvent to obtain a solution B; 3) dropwise adding the solution B in the solution A to obtain a precursor solution; 4) transferring the precursor solution into a stainless steel reaction kettle, wherein hydrothermal temperature is 180 DEG C and reaction duration is 6-24hours; and 5) after the reaction, cooling to normal temperature, repeatedly cleaning and centrifuging through de-ionized water and anhydrous ethanol, and air-drying under a natural condition to obtain the target product. The preparation method disclosed by the invention has the advantages that the preparation method is simple in process, moderate in reaction condition, low in cost and high in crystallizing degree of the prepared product; and through different solvents, the prepared BiPO4 photocatalysts are different in structure with remarkable difference, easy to distinguish, and provide a material basis for widening application field.

The invention discloses a bismuth-phosphate-based composite photocatalytic material. The bismuth-phosphate-based composite photocatalytic material comprises fluorine-nitrogen-codoped bismuth phosphate, bismuth tungstate and bismuth vanadate at a molar ratio of 1 to (0.1-0.3) to (0.1-0.3). The invention further discloses a preparation method of the bismuth-phosphate-based composite photocatalytic material. The preparation method comprises the steps of dissolving bismuth nitrate pentahydrate in a nitric acid solution, adding a mixed solution of phosphate, ammonium tungstate, ammonium metavanadate and sodium hydroxide solution, and carrying out microwave hydrothermal reaction, centrifugation and drying, so as to obtain the bismuth-phosphate-based composite photocatalytic material. According to the bismuth-phosphate-based composite photocatalytic material, by virtue of codoping of nonmetal fluorine and nitrogen ions, the capacity for capturing electrons at an interface among three semiconductors including bismuth phosphate, bismuth tungstate and bismuth vanadate is effectively improved, and the migration efficiency of electron holes is increased; the three semiconductors are compounded at the interface and can form a heterogeneous structure, so that the separation of photon-generated carriers is effectively promoted, and the photocatalytic activity of a composite system is improved.

The invention discloses a biomimetic synthesis method of a high-activity nanometer bismuth phosphate photocatalyst. According to the technical scheme, the biomimetic synthesis method is characterized by comprising the following steps: (1) dissolving soluble starch into a 1mol/L nitric acid solution, adding bismuth nitrate after evenly agitating, and agitating for 2 hours again so as to obtain a mixed solution, wherein the molar ratio of the soluble starch to bismuth nitrate is (1-4):1; and (2) adding phosphate with molar weight equal to that of bismuth nitrate to the mixed solution prepared in the step (1), agitating for 0.5 hour, adjusting the pH to 1-7 by ammonium hydroxide, agitating for 0.5 hour again, transferring into a hydrothermal reaction kettle to carry out hydrothermal reaction at 150-210 DEG C for 6-24 hours, centrifugally separating, washing, drying in vacuum at 60 DEG C for 4 hours, and then burning at 400-500 DEG C for 2 hours, thereby obtaining the high-activity nanometer bismuth phosphate photocatalyst. The high-activity nanometer bismuth phosphate photocatalyst prepared by the method is a nanometer material and has high photocatalytic activity, which is higher than that of P25 and a bismuth phosphate photocatalyst prepared by a common hydrothermal method.

The invention discloses a bismuth tungstate/carbon nitride/bismuth phosphate composite photocatalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps: by taking C3N4 powder prepared through cofiring of Bi2WO6 and BiPO4 powder prepared through microwave hydrothermal synthesis, and melamine and urea, as a raw material, and methanol as a solvent, synthesizing a Bi2WO6/BiPO4/C3N4 composite photocatalyst by using an ultrasonic method through two steps. The composite powder prepared by using the method is high in crystallinity degree, components form a heterogeneous structure, the composite process is implemented at room temperature, the reaction conditions are gentle, the photocatalytic performance can be remarkably improved, and the photocatalyst has wide application prospects in organic pollutant photocatalytic degradation.

A preparation method of a rod-like bismuth phosphate loaded biomass carbon aerogel material belongs to the technical field of material preparation and photocatalytic environmental pollution control. The preparation method comprises the following steps: removing skin and bladder of a white gourd, and preparing biomass carbon-based wet gel according to a hydrothermal method without adding any surfactant. The prepared rod-like bismuth phosphate loaded biomass carbon aerogel material is 0.3 to 0.5 [mu]m in diameter, and has such a photocatalytic degradation effect on a simulative dyeing wastewater methylene blue solution that the degradation rate of methylene blue in a 10 mg/L methylene blue solution can reach up to 90 percent when the bismuth phosphate loaded biomass carbon aerogel material is added into the methylene blue solution and the mixture is exposed in visible light for 3.5 hours, so that the rod-like bismuth phosphate loaded biomass carbon aerogel material can be applied to the field of dyeing wastewater treatment.

The invention discloses a preparation method of a phosphorus doped bismuth phosphate photocatalyst, and belongs to the technical field of preparing of nanometer materials; the preparation method is as follows: first mixing red phosphorus and deionized water in an autoclave for hydrothermal reaction, after the reaction, washing an obtained solid product with the deionized water, drying to obtain a red phosphorus precursor with surface oxides being removed; then under magnetic stirring, putting the red phosphorus precursor in an aqueous nitric acid solution in which bismuth nitrate is dissolved for ultrasonic treatment, placing the mixing system in the autoclave at 180 DEG C for hydrothermal reaction, and after the reaction, cooling to room temperature; then washing a precipitate product with the deionized water and ethanol, and finally, drying to obtain the phosphorus doped bismuth phosphate photocatalyst. According to the method, the phosphorus doped bismuth phosphate photocatalyst can be successfully prepared by one step low temperature hydrothermal method, the method is novel and simple, the phosphorus doped bismuth phosphate photocatalyst is high in photocatalytic activity, a simulated dye can be degraded under the condition of light irradiation, and 2.5 hours after the degradation rate is as high as 95%.

The invention provides a preparation method of a bismuth phosphate photocatalyst, and relates to the field of photocatalysts. The preparation method comprises the following steps: (1) dissolving EDTA-2Na and bismuth nitrate in water, adjusting the pH value to be 2 to 3, stirring the EDTA-2Na and the bismuth nitrate to be uniform, and adding sodium phosphate into the EDTA-2Na and the bismuth nitrate, so as to obtain mixed solution; (2), putting the mixed solution obtained in the step (1) into a high pressure reactor, and reacting for 18 to 24 hours at the temperature of 160 to 180 DEG C; and (3), performing centrifugation to take precipitate after the reaction in the second step is accomplished, and then obtaining the bismuth phosphate photocatalyst after drying. The method changes a traditional method that the bismuth phosphate nanorod is prepared from glycerol and water mixed solvent into the EDTA-2Na complexing bismuth ions, controls crystal morphology growth through the process of releasing the bismuth ions through complexing, obtains bismuth phosphate photocatalyst with novel crystal morphology which is snowflake-shaped. The preparation method is simple, the cost is low, without needing medicine with high price, the operation process is simple, and the method is easy to implement.

The invention discloses bismuth tungstate/bismuth phosphate heterojunction photocatalyst and a preparation method and application thereof. Bi2WO6 and BiPO4 which are synthesized through a microwave hydrothermal method are utilized as raw materials, methyl alcohol is utilized as a solvent, and an ultrasonic method stirring method is utilized to synthesize the Bi2WO6/BiPO4 heterojunction photocatalyst. A composition powder body prepared through the method has high crystallization, heterogeneous structures are formed between ingredients, a compounding process is performed under room temperature, reaction conditions are moderate, and photocatalytic performance can be obviously improved compared with Bi2WO6 and BiPO4 photocatalysts. In simulated sunlight illumination, the degradation rate of the heterojunction photocatalyst is 1.02 times that of Bi2WO6 and 59 times that of BiPO4; thus, the heterojunction photocatalyst has a wide application prospect in an aspect of photocatalytic degradation of organic pollutants.

The invention discloses a method for synthesizing a flower-ball-shaped bismuth phosphate nano-powder photocatalyst by a microwave hydrothermal process. According to the key points of the technical scheme, the method comprises the following steps: (1) preparing a bismuth nitrate solution from bismuth nitrate and deionized water, and adding an ionic liquid 1-butyl-3-methylimidazole hexafluorophosphate in the bismuth nitrate solution under a stirring condition, thereby forming a uniform transparent solution; (2) transferring the uniform transparent solution into a hydrothermal reaction kettle, adjusting the pH of the reacting solution to 1-11 by acid or alkali, placing the hydrothermal reaction kettle into a microwave digester and lasting microwave reaction for 10-60 minutes; and (3) after reaction, cooling, centrifuging, washing and drying, thereby obtaining the flower-ball-shaped bismuth phosphate nano-powder photocatalyst. According to the method, the ionic liquid serves as a substitute for a traditional raw material to prepare the BiPO4 photocatalyst; in a reaction system, the ionic liquid can not only serve as a raw material, but also serve as a template agent for modification on the surface of BiPO4, and is capable of capturing photogenerated electrons and inhibiting the recombination of photogenerated electrons and electron holes, thereby enhancing the capability of bismuth phosphate in photocatalytically degrading organic pollutants.

The invention provides a bismuth phosphate nano crystal cluster as well as a preparation method and an application thereof. The method comprises the following steps: dissolving bismuth nitrate pentahydrate and wodium phorhoate tribaric dodecahydrate into water according to the molar ratio of Bi to P of 1:1, so as to obtain a precursor solution; pouring the precursor solution into a microwave hydrothermal reaction kettle; putting the microwave hydrothermal reaction kettle into a microwave hydrothermal reaction instrument; and preparing the bismuth phosphate nano crystal cluster by adopting a microwave hydrothermal process. The preparation method provided by the invention integrates the unique heating characteristics of the microwave and the advantages of the hydrothermal process as an environment-friendly rapid synthesis process; the preparation method is simple in process, easy to control, and short in preparation cycle; energy sources are saved; the obtained bismuth phosphate nano crystal cluster is in a structure of monoclinic phase monazite and hexagonal phase mixed crystal; the particle size distribution is uniform; and the bismuth phosphate nano crystal cluster has a good photocatalytic effect under ultraviolet irradiation, can be applied to degradation of environmental pollutants, and has a wide application prospect.

The invention discloses a composite silver bromide-bismuth phosphate heterojunction photocatalytic material. Silver bromide nanoparticles are deposited on the bismuth phosphate surface of a micron-sized rod structure, wherein the molar weight of silver bromide is 5.5-14.6% of that of bismuth phosphate. The composite silver bromide-bismuth phosphate heterojunction photocatalytic material has the advantages that agglomeration is not generated; compared with bismuth phosphate and silver bromide, the visible-light catalytic activity is obviously improved; the stability and the performance for repeated use are good; the preparation technology is simple, and the shapes and sizes of materials are easy to control.

The invention relates to the catalytic field of application of a bismuth phosphate compound serving as a catalyst for photochemical water splitting hydrogen production. The bismuth phosphate compound serves as the catalyst for photochemical water splitting hydrogen production, and is characterized in that during the process of photochemical water splitting hydrogen production, ultraviolet light is used. Due to the application of the bismuth phosphate compound serving as the catalyst for photochemical water splitting hydrogen production, the hydrogen production rate is higher that of P25 commercial titanium dioxide.

The invention provides a secondary battery negative electrode. The secondary battery negative electrode comprises metal foil and a compact metal phosphate film arranged on the surface of the metal foil; the metal foil serves as a negative current collector and an negative electrode active material at the same time and is made of any one of aluminum, copper, iron, tin, zinc, nickel, manganese, lead, antimony, cadmium and bismuth, or an alloy containing at least one of the metal elements; and the metal phosphate film is made of one or more of aluminum phosphate, copper phosphate, iron phosphate,tin phosphate, zinc phosphate, nickel phosphate, manganese phosphate, lead phosphate, antimony phosphate, cadmium phosphate and bismuth phosphate. According to the secondary battery negative electrode, the metal phosphate film which is electrically insulated and is provided with lithium ions capable of migrating is arranged on the surface of the metal foil; the metal phosphate film achieves the similar function of a solid electrolyte membrane; and the compatibility of the negative electrode and electrolyte is improved, and the charging and discharging efficiency of a battery, the cycling performance of the battery, the high-and-low temperature performance and the safety performance are improved. The invention further provides a preparation method of the secondary battery negative electrode and a secondary battery.

The invention discloses a preparation method of a lanthanum doped bismuth phosphate photocatalyst. The method comprises the steps that bismuth phosphate pentahydrate is dissolved in an aqueous nitric acid solution, and a solution A is obtained; lanthanum nitrate hexahydrate is dissolved in water, and a solution B is obtained; a phosphorus source compound is added to the solution B, and a solution C is obtained; the solution A is added dropwise to the solution C and stirred continuously, and a solution E is obtained; the solution E is transferred to a reaction kettle for a hydrothermal reaction, and a product is cooled to the room temperature after the reaction is finished; a product is subjected to filtering and separation, a precipitation product is washed with distilled water and ethyl alcohol and dried, and the lanthanum doped bismuth phosphate photocatalyst is obtained. The lanthanum doped bismuth phosphate photocatalyst is prepared by one step on the basis of the low-temperature hydrothermal reaction. The preparation method is simple, low in cost and short in time, the product yield is high, the prepared lanthanum doped bismuth phosphate photocatalyst has high catalytic activity, and the degradation rate is as high as 95% when the photocatalyst is used for degrading a simulating dye after 90 min under an illumination condition.

The invention discloses a preparation method for a bismuth phosphate photocatalyst with different microstructures, and belongs to the technical field of photocatalysts. According to the technical scheme, the key point is that the method comprises the steps of (1) dissolving bismuth phosphate into a nitric acid solution with the mole concentration of 0.5-3mol/L, adding EDTA (ethylene diamine tetraacetic acid) disodium salt, uniformly stirring, mixing, and then adding sodium dihydrogen phosphate to obtain a mixed solution I; (2) adding a sodium hydroxide solution with the mole concentration of 0.5-3mol/L into the obtained mixed solution I to obtain a mixed solution II, adjusting the pH of the mixed solution II to be 1, and then stewing the mixed solution II under room temperature for 1-120 hours to obtain precipitates; (3) performing centrifugal separation on the precipitates, washing and drying the precipitates, and sintering under the temperature of 400-600 DEG C to obtain the bismuth phosphate photocatalyst with the different microstructures. The preparation method is simple, feasible and low in cost, an operating process is easy to control, and the prepared bismuth phosphate photocatalyst with the different microstructures is high in photocatalysis activity.

The invention aims to provide a method for synthesizing bismuth phosphate nano particles by a room-temperature solid-phase chemical method. According to the method, cheap raw materials, namely solid bismuth salt and solid phosphate, are used as reactants, a simple operation process is adopted, and solid-phase direct chemical reaction is performed at room temperature to synthesize the bismuth phosphate nano particles. The method for preparing the bismuth phosphate nano particles, provided by the invention, has the characteristics of low cost, simplicity and good convenience in operation, short time and easiness in realization of mass production, and thus has an extremely wide application prospect.

The invention provides a bismuth phosphate composite reduction graphene oxide material as well as a preparation method and application thereof, and belongs to the technical field of composite materials. The preparation method provided by the invention is simple in required equipment, easy to operate, high in repeatability, and free of additional catalyst, surfactant, structure directing agent andthe like in the reaction process; the bismuth phosphate composite reduction graphene oxide material can be obtained only by one-step reaction, so that the reaction cost is low, and the method is suitable for industrial mass production; and the when the obtained bismuth phosphate composite reduction graphene oxide material is used for a negative electrode material of a sodium ion battery, the batter is high mass specific capacity and high in cycling stability. Furthermore, the reaction temperature of the preparation method provided by the invention is lower than 100 DEG C, and the reaction conditions are mild. The result shows that when the bismuth phosphate composite reduction graphene oxide material provided by the invention is applied to the negative electrode material of the sodium ionbattery, the mass specific capacity of the battery can reach 293.5mAh/g after the battery is subjected to 300 charging and discharging cycles.

A disclosed in-situ doped type bismuth phosphate-cuprous oxide composite photocatalyst is composed of fluorine-nitrogen co-doped bismuth phosphate and cuprous oxide with the molar ratio of 1:0.2-1. The invention also discloses a preparation method for the photocatalyst. The preparation method comprises: dissolving bismuth nitrate pentahydrate in a nitric acid solution, then adding a phosphate solution and ammonic chloride, then adding a mixed solution of copper sulfate pentahydrate, xylitol and sodium hydroxide, stirring uniformly, and performing microwave hydrothermal reaction, centrifugation and drying to obtain the photocatalyst. Through co-doping of nonmetal fluorine and nitrogen ions, the in-situ doped type bismuth phosphate-cuprous oxide composite photocatalyst effectively improves the electron capture capability of a bismuth phosphate semiconductor at the interface and enhances the electron cavity migration efficiency. Through nonmetal ion co-doping, the oxygen cavity concentration in the bismuth phosphate semiconductor is increased, and further the photocatalytic activity of bismuth phosphate is improved.

The invention relates to a red bismuth phosphate fluorescent material, a preparation method and application thereof. The chemical formula of the red bismuth phosphate fluorescent material is Ca18Li3BixEu1-x(PO4)14. The raw materials include: an Ca-containing oxide or a compound transformable into the oxide serving as the Ca source; an Li-containing oxide or a compound transformable into the oxide serving as the Li source; an Eu-containing oxide, chloride or nitrate serving as the Eu source; a Bi-containing oxide, hydroxide serving as the Bi source; and a P-containing oxide or a compound transformable into an oxide of P serving as the P source. The preparation method includes: mixing the raw materials, firstly performing heating to 800DEG C< conducting heat preservation for 2h, then raising the temperature to 1180DEG C, conducting heat preservation for 8h, then performing tube furnace cooling to room temperature. The red bismuth phosphate fluorescent material provided by the invention has the characteristics of simple preparation method, high thermal stability and chemical stability, the product is easy for mass production, and has great industrial application value.

The invention belongs to the technical field of catalysts, and particularly relates to a desulfurization catalyst and a preparation method thereof. The catalyst comprises europium and lutetium co-doped bismuth oxybromide, bismuth molybdate and bismuth phosphate, and the molar ratio of europium and lutetium co-doped bismuth oxybromide to bismuth molybdate to bismuth phosphate is 1:0.05 to 0.15:0.05to 0.15; the doping amount of europium relative to bismuth oxybromide is 0.5 to 1.5 wt%, and the doping amount of lutetium relative to bismuth oxybromide is 0.5 to 1.5 wt%. The preparation method comprises the following steps: preparing europium and lutetium co-doped bismuth oxybromide through a solvothermal method, dispersing the europium and lutetium co-doped bismuth oxybromide into deionized water, adding molybdic acid and phosphoric acid, and preparing praseodymium and lutetium co-doped bismuth oxybromide/bismuth molybdate/bismuth phosphate through a hydrothermal method. The preparation method is simple. In addition, aromatic heterocyclic thiophene sulfide in fuel oil is removed in a high-selectivity and high-efficiency manner, and the catalyst is an ideal material for treating the aromatic heterocyclic thiophene sulfide in the fuel oil.

The invention provides a preparing method for Rubik-cube-shaped sillenite bismuth phosphate powder. According to the method, a NaH2PO4 solution of a certain molar ratio is added into a Bi(NO3)3 nitric acid solution to obtain white turbid liquid; an alkali metal hydroxide solution of a certain amount is added into the white turbid liquid, and magnetically stirred until the turbid liquid turns yellow; the obtained yellow turbid liquid is transferred into a hydrothermal reaction kettle to be subjected to a reaction, after the reaction is completed, cooling is carried out, and yellow precipitate in the reaction kettle is taken out, washed and dried to obtain the Rubik-cube-shaped sillenite bismuth phosphate Bi12P0.86O20.14 powder. The method has the advantages that a device is simple, temperature is low (120 DEG C-140 DEG C), and environmental protection is achieved (the synthetic reaction is carried out in a closed system); the powder is synthesized at a time in a hydrothermal mode, high-temperature calcinations is not needed, the synthesized powder is high in purity and crystallinity, and regular in morphology, and the preparing method is simple in process, high in efficiency, low in energy consumption and low in cost.