Preparation method for bismuth ferrate nano fibers

A technology of nanofibers and bismuth ferrite, applied in nanotechnology, chemical instruments and methods, iron compounds, etc., can solve the problems that visible light cannot be absorbed well, and cannot meet the high-efficiency absorption of sunlight

Inactive Publication Date: 2012-07-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The document "A.K.Alves, F.A.Berutti, F.J.Clemensb, T.Grauleb and C.P.Bergmann, Photocatalytic activity of titania fibers obtained by electrospinning, Materials Research Bulletin, 2009, 44, 312-317" discloses a method for preparing titanium dioxide photocatalytic materials, This method adopts the electrospinning method to prepare titanium dioxide photocatalytic material, but the bandgap width of this titanium dioxide photocatalytic material is 3.2-3.4ev, because of the wide bandgap, it cannot absorb visible light very well, and cannot satisfy the high efficiency of sunlight. absorption requirements

Method used

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  • Preparation method for bismuth ferrate nano fibers
  • Preparation method for bismuth ferrate nano fibers
  • Preparation method for bismuth ferrate nano fibers

Examples

Experimental program
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Embodiment 1

[0015] Example 1, first dissolving citric acid into deionized water to form a citric acid solution with a concentration of 0.2g / mL; then adding iron nitrate and bismuth nitrate to the citric acid solution and stirring until clear and transparent, wherein The molar ratio of the acid is 2:1:6; after the solution is allowed to stand for 48 hours, it is placed in a water bath and heated and stirred at 60°C for 4 hours, and the solution is added with a molecular weight of 1.3×10 6 Continue to stir until the polyvinylpyrrolidone is completely dissolved, so that the concentration of polyvinylpyrrolidone is kept at 0.03g / mL; finally, add this polymer solution to a plastic syringe with an inner diameter of 2mm and a stainless steel needle. Add the syringe to the syringe pump, start the syringe pump to make the injection flow rate 0.3mL / h, and turn on the high-voltage power supply to provide a voltage of 20kV to the needle, and collect the fibers with a single crystal silicon wafer; plac...

Embodiment 2

[0017] Example 2, first dissolving citric acid into deionized water to form a citric acid solution with a concentration of 0.4g / mL; then adding ferric nitrate and bismuth nitrate to the citric acid solution and stirring until clear and transparent, wherein ferric nitrate, bismuth nitrate, lemon The molar ratio of the acid is 2:1:6; after the solution is allowed to stand for 24 hours, it is placed in a water bath and heated and stirred at 50°C for 7 hours, and the solution is added with a molecular weight of 1.3×10 6 Continue to stir until the polyvinylpyrrolidone is completely dissolved, so that the concentration of polyvinylpyrrolidone is kept at 0.02g / mL; finally, add this polymer solution to a plastic syringe with an inner diameter of 1mm and a stainless steel needle. Add the syringe to the syringe pump, start the syringe pump to make the injection flow rate 0.7mL / h, and turn on the high-voltage power supply to provide a voltage of 25kV to the needle, and collect the fibers ...

Embodiment 3

[0019] Example 3, first dissolving citric acid into deionized water to form a citric acid solution with a concentration of 0.3g / mL; then adding ferric nitrate and bismuth nitrate to the citric acid solution and stirring until clear and transparent, wherein ferric nitrate, bismuth nitrate, lemon The molar ratio of the acid is 2:1:6; after the solution is allowed to stand for 72 hours, it is placed in a water bath and heated and stirred at 70°C for 6 hours, and the solution is added with a molecular weight of 1.3×10 6 Continue to stir until the polyvinylpyrrolidone is completely dissolved, so that the concentration of polyvinylpyrrolidone is kept at 0.04g / mL; finally, add this high polymer solution to a plastic syringe with an inner diameter of 3mm and a stainless steel needle. Add the syringe to the syringe pump, start the syringe pump to make the injection flow rate 0.4mL / h, and turn on the high-voltage power supply to provide a voltage of 30kV to the needle, and collect the fi...

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Abstract

The invention discloses a preparation method for bismuth ferrate nano fibers and aims to solve the technical problem that the traditional photocatalytic material has a wide band gap. The invention adopts the technical scheme which comprises the following steps of: dissolving citric acid in deionized water to form a citric acid solution; adding ferric nitrate and bismuth nitrate into the citric acid solution, stirring the mixture until the mixture is clear and transparent, after standing the solution, heating and stirring the solution in a water-bath pot, adding polyvinylpyrrolidone into the solution, continuously stirring until the polyvinylpyrrolidone is completely dissolved, keeping the concentration of the polyvinylpyrrolidone, performing electrostatic spinning by using an injection pump and a high-pressure power supply, and collecting the fibers by using a monocrystalline wafer; and after drying the collected fibers in a drying box, calcining the fibers at consistent temperature in a muffle furnace to obtain the bismuth ferrate nano fibers. The band gap of the bismuth ferrate nano fibers prepared by the preparation method is reduced from 3.2 to 3.4ev in the background technology to below 2.1ev.

Description

technical field [0001] The invention relates to a method for preparing nanofibers, in particular to a method for preparing bismuth ferrite nanofibers. Background technique [0002] Photocatalytic materials are chemical substances that can play a catalytic role under the excitation of photons, and are extremely important functional materials. Photocatalytic technology is a bionic technology, which is widely used in many cutting-edge fields such as energy conservation and environmental protection, new energy, and biomedicine. [0003] The document "A.K.Alves, F.A.Berutti, F.J.Clemensb, T.Grauleb and C.P.Bergmann, Photocatalytic activity of titania fibers obtained by electrospinning, Materials Research Bulletin, 2009, 44, 312-317" discloses a method for preparing titanium dioxide photocatalytic materials, This method adopts the electrospinning method to prepare titanium dioxide photocatalytic material, but the bandgap width of this titanium dioxide photocatalytic material is 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
Inventor 樊慧庆杨超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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