20 results about "Bismuth nanoparticles" patented technology

The application provides a preparation method of bismuth nanoparticle material and application thereof, and dissolves bismuth nitrate pentahydrate in ethylene glycol to prepare a solution, then adds nitric acid to accurately adjust the pH value of the solution to 1.0; dissolves sodium citrate in ethylene glycol to prepare a solution; mixes the two solutions and uniformly mixes; transfers the mixed solution to a microwave reaction kettle, and under the condition that the temperature is 110-130 DEG C and the microwave power is 300-500 W, radiates and reacts for 20-40 min; cools to room temperature, and the obtained product is washed by centrifugation with ethanol for multiple times, and dried, to obtain black bismuth nanoparticles. The application accurately controls the acidic environment of the precursor solution by nitric acid, and utilizes the synergistic and co-reduction effect of sodium citrate and ethylene glycol to quickly and controllably reduce Bi 3+ to elemental Bi to form nanoparticles. The application has outstanding advantages in efficiency, controllability, environmental protection and cost.

This invention discloses a dodecahedral Co-C / LDH composite electrode material loaded with bismuth nanoparticles, its preparation method, and its application. The composite material has a dodecahedron formed by a Co-C amorphous carbon layer as the core, an outer NiCoAl-LDH layer, and a surface loaded with Bi nanoparticles, forming a unique three-dimensional core-shell structure. Co-C / NiCoAl-LDH@Bi is assembled as the anode and AC as the cathode. The Co-C / NiCoAl-LDH@Bi / / AC device improves the Cl... ‑ Storage capacity, electrochemical reaction kinetics, and long-term cycling stability expand the application boundaries of LDH materials in the field of high-performance CDI anodes, providing high-performance material support for the practical application of CDI technology in seawater desalination. It is expected to promote the development and implementation of low-cost, large-scale seawater desalination systems and has important industrial application prospects and environmental value.

This invention relates to a method for preparing carbon nanoflower-coated bismuth electrode materials for fast-charging batteries, belonging to the field of new energy electrode material preparation technology. The invention involves adding bismuth oxide and chitin-like substances to deionized water and ultrasonically dispersing them to obtain a mixed solution. The mixed solution is then sealed in a reaction vessel and subjected to a high-temperature, high-pressure reaction, followed by solid-liquid separation to obtain the reaction product. The reaction product is calcined under a protective or reducing atmosphere to obtain the carbon nanoflower-coated bismuth electrode material. This carbon nanoflower-coated bismuth electrode material is a core-shell material, with a bismuth core and an outer shell of N-doped carbon nanoflowers, on which bismuth nanoparticles are loaded. The nanoflower coating layer of this invention exhibits high electrolyte permeability and wettability, buffering the volumetric expansion of the internal bismuth electrode during charging and discharging. The bismuth nanoparticles loaded on the carbon nanoflowers effectively improve the electrode's diffusion kinetics. The carbon nanoflower-coated bismuth electrode material possesses a large volumetric capacity and excellent fast-charging performance.

The invention relates to monodisperse elemental metal bismuth nanoparticles and a continuous flow macro preparation method thereof, and solves one of the problems that the existing synthesized elemental metal bismuth nanoparticles are low in yield, low in yield, long in reaction time, difficult in particle size distribution control and the like. According to the method disclosed by the invention, atomic-scale mixing of two kinds of reaction liquids and generation of elemental bismuth nano-particles can be realized, space separation of mass transfer mixing and rapid reaction is effectively realized, the rapid mass transfer requirement required by the rapid reaction is met, continuous reaction operation is also realized, and the method is suitable for industrial production. The particle size of the monodisperse elemental metal bismuth nanoparticles prepared by the method disclosed by the invention is 2-200nm, and the yield of the bismuth nanoparticles is greater than or equal to 70%.

The invention discloses a bismuth titanate biomass charcoal composite material for environmental remediation and a preparation method thereof, and relates to the field of environmental functional materials.The composite material takes corncob biomass charcoal as a carrier, and bismuth titanate nanoparticles are loaded on the surface and in pores of the corncob biomass charcoal; the corncob biomass charcoal has a hierarchical porous structure, the specific surface area of the corncob biomass charcoal is not less than 1500 m / g, and the surface of the corncob biomass charcoal is rich in oxygen-containing functional groups; the bismuth titanate nanoparticles and the corncob biomass charcoal are tightly combined through a heterojunction interface; according to the bismuth titanate biomass charcoal composite material for environmental restoration and the preparation method of the bismuth titanate biomass charcoal composite material, firstly, pollutants are rapidly adsorbed and enriched to the periphery of bismuth titanate active sites through the high specific surface area and abundant pore structure of the corncob charcoal, local high concentration is formed, and favorable conditions are created for subsequent photocatalytic reaction; bismuth titanate generates strong oxidizing active oxygen species under excitation of visible light, and adsorbed pollutants are thoroughly degraded.

The invention relates to the field of gas diffusion electrodes, and discloses a multilayer gas diffusion electrode and a preparation method and application thereof, the electrode comprises a gas diffusion layer, a hydrophobic layer, a conductive layer, a catalyst layer and a porous protective layer, a catalyst in the catalyst layer comprises nitrogen-doped bismuth nanoparticles and a structural unit which is used for carrying out graft modification on the nitrogen-doped bismuth nanoparticles and is shown in a formula (1), R1 and R2 are hydrogen or alkyl respectively, and the sum of carbon numbers of R1 and R2 is smaller than 4. The gas diffusion electrode disclosed by the invention is excellent in performance and outstanding in stability in carbon dioxide electrolysis.

The invention provides a catalyst for preparing formic acid by electrolyzing carbon dioxide and a preparation method thereof, the catalyst comprises nitrogen-doped bismuth nanoparticles and a structural unit as shown in a formula (1) for graft modification of the nitrogen-doped bismuth nanoparticles, R1 and R2 are hydrogen or alkyl respectively, and the sum of carbon numbers of R1 and R2 is less than 4. The invention provides an electrocatalytic reduction method of carbon dioxide, which comprises the following steps: in the presence of the catalyst, taking gaseous carbon dioxide or carbon dioxide dissolved in a solvent as a reactant, and converting the carbon dioxide into formic acid or formate under an electrifying condition. The catalyst disclosed by the invention is excellent in performance in carbon dioxide electrolysis and has relatively high activity and formic acid selectivity.

The invention discloses an As (III) and Cd (II) ion imprinting electrochemical sensor and an electrochemical detection method. The sensor takes a glassy carbon electrode as a substrate, an amino-functionalized zirconium-based metal organic framework material is modified by a dispensing method, and then bismuth nanoparticles are deposited on the surface of the amino-functionalized zirconium-based metal organic framework material to form a composite interface. Then, an As (III)-Cd (II) double-template ion imprinted polymer membrane based on the simulated and optimized functional monomer proportion is constructed on the composite interface, and AsCd-IIM / NH2-UiO-66 (Zr) (at) Bi / GCE is obtained. The sensor shows a good linear relationship in a concentration range of 0.0002 to 32.3 [mu] mol. L <-1 >. The detection limit is as low as 1.3 * 10 <-10 > mol.L <-1 > (S / N = 3). Compared with a traditional detection method and a non-imprinted control group, the sensor and the detection method developed by the invention show higher sensitivity and anti-interference capability.

This invention relates to a method for preparing a uniformly distributed bismuth nanoparticle / carbon nanorod composite material (Bi / CNRs) and its application as a negative electrode material for low-temperature fast-charging sodium-ion batteries. The preparation steps of this composite material are as follows: a) preparing bismuth iodide nanosheets (BiOI NSs); b) dispersing BiOI NSs and trimesic acid in a mixed solution of N,N-dimethylformamide and methanol, followed by hydrothermal reaction to obtain metal-organic framework materials (Bi-MOFs); c) thermally shocking the Bi-MOFs in an Ar atmosphere to obtain the Bi / CNRs composite material. As a negative electrode material for sodium-ion batteries, Bi / CNRs exhibits outstanding low-temperature electrochemical performance, reaching -40℃ and 5Ag. ‑1 The capacity at current density is 261 mAh g. ‑1 ;1A g ‑1 The capacity after 2400 cycles is 240mAh g. ‑1 This invention provides a new approach for developing low-temperature sodium-ion battery anode materials with excellent overall performance.

The invention relates to an Escherichia coli (E. coli-BSO) biological compound system for biological hydrogen production. The biological composite system breaks through the limitation of a traditional single microorganism and material hydrogen production system, bismuth stannate (BSO) nanoparticles and escherichia coli are combined through electrostatic interaction, and a novel composite system with the microbial metabolism hydrogen production capacity and the nanometer material photocatalytic performance is constructed. The system creatively integrates the inherent hydrogen production metabolic pathway in escherichia coli cells and the excellent visible light absorption capacity and photocatalytic electron transfer performance of the BSO nano material, and solves the problems that the light energy utilization rate of pure microorganisms is low, and hydrogen production of pure photocatalytic materials depends on exogenous electron donors. Experiments prove that under visible light irradiation, the hydrogen yield of the composite system reaches 0.8 mmol within 4 hours, the hydrogen production efficiency is improved by 1.5 times compared with that of pure escherichia coli, and the efficiency bottleneck of an existing biological hydrogen production technology is remarkably broken through.

The application prepares an E.coli-BSO biological composite system for biological hydrogen production. The biological composite system breaks through the limitation of traditional single microorganism and material hydrogen production system, combines bismuth stannate (BSO) nanoparticles and E.coli through electrostatic interaction, and constructs a new composite system with the hydrogen production ability of microbial metabolism and the photocatalytic performance of nanomaterials. The system integrates the inherent hydrogen production metabolic pathway in E.coli cells and the excellent visible light absorption ability and photocatalytic electron transfer performance of BSO nanomaterials, solves the problems of low light energy utilization rate of pure microorganisms and hydrogen production of pure photocatalytic materials depending on external electron donors. Experimental verification shows that under visible light irradiation, the hydrogen production of the composite system reaches 0.8 mmol within 4 hours, which is 1.5 times higher than that of pure E.coli, and significantly breaks through the efficiency bottleneck of existing biological hydrogen production technology.

The invention provides a preparation method and application of a bismuth nanoparticle material. Bismuth nitrate pentahydrate is dissolved in ethylene glycol to prepare a solution, and then nitric acid is added to accurately adjust the pH value of the solution to 1.0; dissolving sodium citrate in ethylene glycol to prepare a solution; uniformly mixing the two solutions; transferring the mixed solution into a microwave reaction kettle, and carrying out radiation reaction for 20-40 minutes under the conditions that the temperature is 110-130 DEG C and the microwave power is 300-500 W; and cooling to room temperature, centrifugally washing the obtained product with ethanol for multiple times, and drying to obtain the black bismuth nanoparticles. The acid environment of the precursor solution is accurately regulated and controlled through nitric acid, and Bi < 3 + > is rapidly and controllably reduced into elementary substance Bi under microwave radiation by utilizing the synergistic co-reduction effect of sodium citrate and ethylene glycol, so that the nanoparticles are formed. The method has outstanding advantages in the aspects of efficiency, controllability, environmental protection and cost.

The invention discloses a high-performance bismuth / carbon negative electrode material, a preparation method and application of the high-performance bismuth / carbon negative electrode material in a sodium-ion battery, and the preparation method comprises the following steps: taking basic bismuth gallate as a precursor material, and carrying out simple carbon thermal reduction treatment to obtain the final bismuth / carbon negative electrode material (Bi (at) C). The bismuth / carbon composite material prepared by the invention is uniformly loaded with metal bismuth nanoparticles and is coated with a carbon layer, the bismuth nanoparticles are used as a core sodium storage active component and provide higher capacity by virtue of excellent sodium ion embedding / de-embedding capability, and the carbon layer coated on the surface can promote electron transport and sodium ion diffusion and also can be used for preparing a sodium storage material. And the volume expansion and shrinkage of the metal bismuth in the charge-discharge cycle can be relieved, and the structural integrity of the electrode is guaranteed. By virtue of the synergistic effect of the bismuth and the carbon, the prepared bismuth / carbon negative electrode material has the advantage of high specific capacity when being used as a sodium-ion battery negative electrode material, and excellent rate capability and cycling stability are synchronously realized.

The invention relates to the technical field of sodium-ion battery preparation, in particular to a preparation method of a hard carbon composite material containing bismuth nanoparticles and application of the hard carbon composite material in a sodium-ion battery, and the preparation method comprises the following steps: S1, slowly dripping a formaldehyde solution into a resorcinol solution, mixing, then carrying out pre-reaction, then adjusting the pH value of the reaction solution to 8.5-9.0, adding a bismuth precursor, stirring, and carrying out solid-liquid separation to obtain a bismuth nanoparticle-containing hard carbon composite material; then adding a reducing agent, and reacting to obtain a phenolic resin composite bismuth nanoparticle precursor; and S2, calcining the phenolic resin composite bismuth nanoparticle precursor in a nitrogen atmosphere to obtain the hard carbon composite material containing bismuth nanoparticles. According to the composite material system prepared by the technical scheme, the electron and ion transmission performance of a negative electrode can be improved, the problem of sodium separation of hard carbon under a fast charging condition is relieved, the negative electrode is promoted to form a more stable SEI interface, and the rate capability and the cycle stability of a battery are improved.

The application discloses a radio-sensitizing functionalized probiotic hybrid material and a preparation method and application thereof, and belongs to the technical field of medical preparations. Black phosphorus nanosheets and bismuth nanoparticles are prepared first; then the bismuth nanoparticles are blended with the black phosphorus nanosheets in an aqueous solution environment, NH2-PEG 2000 -MAL and MMP-2 enzyme-responsive polypeptides are added and reacted to obtain a black phosphorus-based radio-sensitizer; finally, clostridium butyricum is blended with the black phosphorus-based radio-sensitizer, then N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl) carbonyldiimidazole hydrochloride are added and incubated to obtain the radio-sensitizing functionalized probiotic hybrid material. The method has the advantages of simple process and high operability. The prepared radio-sensitizing functionalized probiotic hybrid material can effectively improve the targeting accuracy of the radio-sensitizer under the driving of anaerobic probiotics, reduce off-target toxic side effects, has the characteristics of high tumor inhibition efficiency, and has a wide application prospect in the field of anti-tumor.

The invention provides a visible-light response composite photo-anode and a confinement packaging method thereof, and the method adopts a three-step method of anodic oxidation, ultrasonic-assisted impregnation and in-situ reduction for preparation. The method comprises the following steps: firstly, preparing a TNAs substrate with a smooth channel in a tube through an anodic oxidation method; then placing the prepared TNAs substrate in a precursor solution, and carrying out ultrasonic-assisted impregnation to generate a bismuth-based semiconductor; and finally, preparing the visible-light response composite photo-anode material by adopting in-situ reduction deposition bismuth nanoparticles. According to the preparation method, bismuth semiconductors (Bi2WO6 and Bi2MoO6) and bismuth nanoparticles are accurately packaged in TiO2 nanotubes through a method of combining anodic oxidation, ultrasonic-assisted impregnation and in-situ reduction, so that the photocatalytic activity is synergistically enhanced by'in-tube heterojunction + SPR effect '. According to the technology, the problems of agglomeration and falling caused by traditional surface loading are solved, and the technology is a core innovation for improving the performance of the photo-anode.

The invention relates to the technical field of lithium ion battery negative electrodes, in particular to a double-carbon-layer optimized lithium ion battery negative electrode material, a preparation method thereof and a lithium ion battery, and the double-carbon-layer optimized lithium ion battery negative electrode material comprises an inner core of a rhombohedral crystal structure formed by bismuth nanoparticles and carbon particles, and a carbon film wrapping the inner core. According to the invention, after the Bi nanoparticles are compounded with the carbon material, the surface of the Bi nanoparticles is coated with a layer of carbon film, and a conductive carbon net in an inner core is utilized to optimize a charge transfer path, so that the electron conductivity of the Bi nanoparticles can be improved, and the charge transfer rate in the charge-discharge process can be effectively improved; and the outer layer can effectively buffer the volume deformation in the Bi alloying and dealloying process by utilizing the packaging of the carbon film, the pulverization of the active substance is inhibited, the side reaction of an electrode-electrolyte interface is obviously reduced through a physical barrier effect, and the advantages of high specific capacity and stability of the negative electrode material under high current can be ensured. And the cycling stability of the Bi negative electrode is greatly improved.

The application belongs to the field of environmental treatment, and provides a method for photocatalytic degradation of perfluorooctanoic acid by bismuth nanoparticle modified titanium dioxide, which comprises the following steps: preparation of bismuth nanoparticle modified titanium dioxide photocatalyst and photocatalytic degradation of perfluorooctanoic acid by using the prepared catalyst. Specifically, titanium dioxide is suspended in a oxalic acid solution, bismuth salt is added, and a suspension is obtained by ultrasonic dispersion; the suspension is reacted under light, solid-liquid separation is performed, the precipitate is collected, washing, freeze-drying is performed, and a solid product is obtained; the solid product is calcined under a nitrogen atmosphere to obtain a bismuth nanoparticle modified titanium dioxide photocatalyst; and the photocatalyst is used to degrade perfluorooctanoic acid under ultraviolet light and sunlight. After modification of bismuth nanoparticles, the recombination of photo-generated electrons and holes of titanium dioxide is effectively inhibited, the absorption of light is improved, efficient degradation of perfluorooctanoic acid in water under natural sunlight can be achieved, and excellent application prospects are achieved. The problem of difficult degradation of PFOA at present is solved.

The invention relates to a core-shell type bismuth nanoparticle and a continuous flow macro-quantity preparation method thereof, belongs to the technical field of nanoparticles, and solves the problems that the core-shell type bismuth nanoparticle synthesized by the existing method is low in yield, low in yield and long in reaction time, cannot realize continuous flow macro-quantity production, and cannot realize continuous flow macro-quantity production. The dispersibility, the chemical stability and the radiation stability are poor. Compared with a tank reactor or a glass container, the method for growing the silicon dioxide shell layer has the advantages that reaction materials can be rapidly and effectively mixed, meanwhile, the specific surface area is larger, the heat exchange efficiency is greatly improved, core-shell type bismuth nanoparticles can be obtained within 0.5 min, the reaction time is shortened, the reaction efficiency is improved, and the method is suitable for industrial production. The thickness of a silicon dioxide shell layer of the core-shell type bismuth nano-particles prepared by the method is 1-20nm, the yield is greater than or equal to 70%, and the reaction time can be shortened to 0.5-10min.

The invention provides a two-dimensional multi-level micro-nano bismuth carbon composite material and a preparation method and application thereof.The material is of a multi-layer stacked micron sheet structure, and the stacked micron sheet structure is of a secondary multi-sheet-layer structure composed of a plurality of primary sheet layer units which are assembled with one another and have interlayer intervals; the primary lamellar unit comprises a carbon shell and bismuth nanoparticles wrapped by a carbon wall, and the bismuth nanoparticles wrapped by the carbon wall are embedded in the carbon shell to form dual-carbon constraining force on the bismuth nanoparticles. The preparation method comprises the following steps: preparing a two-dimensional multi-level bismuth oxybromide precursor; and converting the two-dimensional multi-level bismuth oxybromide precursor into the two-dimensional multi-level micro-nano bismuth carbon composite material by using a carbon thermal reduction method. The material is simple and safe in preparation operation and short in period. The two-dimensional multi-level structure enables the bismuth nano-particles to be densely embedded, high tap density and bismuth content are endowed, high sodium storage capacity is ensured when the two-dimensional multi-level structure is used for the sodium ion battery, and the rate capability is improved; the large interlayer spacing of the multi-layer carbon plate and the double-carbon barrier relieve the volume change, reduce the side reaction and improve the cycling stability.