6 results about "Bismuth citrate" patented technology

The invention relates to the field of complex bone defect treatment, and discloses a nano material with an efficient antibacterial effect and a preparation method thereof.The preparation method comprises the steps that ammonium bismuth citrate and luteolin are mixed and dissolved in formamide, the mixture is put into a reaction kettle to react, a reaction solution is obtained, and Bi-Lu CDs in formamide is obtained after centrifugation and filtration; mixing the MSN-coated Bi-Lu CDs with amino-modified mesoporous silica microspheres, centrifuging, dispersing in deionized water, and drying in vacuum to obtain pure MSN-coated Bi-Lu CDs powder; the preparation method comprises the following steps: preparing a polyurethane dispersion liquid from polyurethane, spraying the polyurethane dispersion liquid on a quartz plate to form a polyurethane film, and spraying MSN and Bi-Lu CDs powder on the polyurethane film to carry out metal spraying treatment; a second precipitate is obtained; drying in vacuum to obtain J-Bi-LuCDs M (at) Au powder; the problems that in the prior art, due to the fact that a pure carbon dot material lacks active diffusion power, the treatment effect on complex tissue defects and bacterial biofilms is still limited, and a precursor material is poor in biocompatibility, not prone to dissolution and low in bioavailability are solved.

The application relates to the technical field of electrocatalysis, in particular to a preparation method and application of a bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst, which comprises the following steps: S1, adding urea and ammonium chloride into water, stirring, freeze-drying, grinding, and obtaining a chelating ligand; S2, adding bismuth citrate into the chelating ligand, carrying out a solid-phase reaction, and obtaining a precursor; and S3, calcining the precursor under nitrogen protection, and obtaining the bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst. The problems that reduction and reconstruction reactions are prone to occur in the process of catalyzing CO2 electrocatalytic reduction, and the difficulty in increasing the recognition and performance regulation of active sites can be solved.

This invention discloses a bismuth-containing mixed-acid vanadium redox flow battery electrolyte, its preparation method, and its application. The desired modified battery electrolyte is obtained by adding a bismuth-containing additive to the mixed-acid vanadium redox flow battery electrolyte and then electrolyzing it. The concentration of the bismuth-containing additive in the modified battery electrolyte is 0.01 mol / L – 0.1 mol / L. The bismuth-containing additive is one or more of bismuth sulfate, bismuth formate, bismuth citrate, and bismuth tartrate, mixed in any proportion. The bismuth-containing mixed-acid vanadium redox flow battery electrolyte obtained by this invention can be used simultaneously in both the positive and negative electrode electrolytes, maintaining homogeneity between the two electrolyte systems and enabling rapid capacity recovery. Simultaneously, the mixed-acid electrolyte exhibits a triple synergistic effect of inhibiting chloride in the positive electrode, catalyzing in the negative electrode, and stabilizing vanadium ions at high temperatures, significantly improving the redox reaction kinetics and electrochemical reversibility during battery cycling, thereby achieving long-term stable battery operation.

This invention belongs to the field of biomedical materials technology, and relates to a signal probe that simultaneously possesses CT and MRI imaging capabilities, its preparation method, and its application. The preparation method includes the following steps: dissolving bismuth citrate and iron salt in water, adjusting the pH of the solution to <7, adding polyvinylpyrrolidone, then adding gallic acid, adjusting the pH of the mixed solution to >7, and after the reaction is complete, filtering through a membrane to remove impurities, dialysis, and drying to obtain bismuth-iron nanoparticles; mixing citric acid with the bismuth-iron nanoparticle solution, stirring and reacting to obtain citric acid-treated bismuth-iron nanoparticles; further activating to obtain an activated bismuth-iron nanoparticle solution; adding RGDfk and amino-terminated polyethylene glycol to the activated bismuth-iron nanoparticle solution, stirring and reacting in the dark, dialysis, and drying to obtain a signal probe that simultaneously possesses CT and MRI imaging capabilities. The signal probe prepared by this invention has a small particle size and simultaneously possesses CT and MRI imaging functions.

The invention discloses a preparation method of a photocatalyst material, and belongs to the technical field of material preparation and pollution treatment. The method comprises the following steps: by taking bismuth citrate as a multifunctional precursor, firstly mixing the bismuth citrate with a titanium source, a manganese source and a cerium source in a solvent for gelation, then carrying out solvothermal reaction to form an intermediate, and finally carrying out programmed temperature control pyrolysis in an inert and oxygen-containing atmosphere. In the pyrolysis process, carbon element doping and manganese and cerium bimetal ion lattice embedding are synchronously realized, and a graded porous folded structure is constructed in situ by utilizing precursor decomposition gas. The method integrally solves the problems of weak visible light response, low mass transfer efficiency and poor stability of a traditional material, and the prepared material shows efficient inhibition and degradation efficiency on mold such as aspergillus flavus under simulated granary low-illumination visible light.

The invention belongs to the technical field of battery materials and energy storage, and particularly relates to application of a preparation method of an NOBi co-doped carbon nanofiber electrode material in an iron-chromium flow battery. The preparation method comprises the following steps: by taking ammonium bismuth citrate as a functional component, adding the ammonium bismuth citrate into a solution of polyacrylonitrile and N, N-dimethylformamide to prepare an electrospinning precursor solution; the preparation method comprises the following steps: preparing polyacrylonitrile-based three-dimensional nanofiber containing ammonium bismuth citrate by utilizing an electrostatic spinning technology, then pre-oxidizing and carbonizing the obtained fiber, and simultaneously introducing active functional components of nitrogen, oxygen and bismuth into the carbon fiber by utilizing pyrolysis of ammonium bismuth citrate in the process, so that the carbon fiber is prepared. Therefore, the carbon nanofiber electrode material is endowed with relatively high hydrogen evolution overpotential and good electrocatalytic activity. When the composite material is used as the negative electrode material of the iron-chromium flow battery, the synergistic effect of all the components can be fully exerted, and the energy conversion efficiency and the rate capability of the battery are effectively improved. The method is simple, efficient and suitable for large-scale production, and has a wide application prospect.