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Bismuth ferrite nano fiber material and preparation method thereof

A technology of nanofibers and bismuth ferrite, which is applied in fiber processing, chemical instruments and methods, artificial filaments of inorganic raw materials, etc., can solve the problems of low quantum efficiency, high recombination rate of photogenerated electrons and holes, and low utilization rate of solar energy and other issues, to achieve the effects of high quantum efficiency, excellent photocatalytic performance, and high utilization rate

Inactive Publication Date: 2013-12-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, semiconductor photocatalytic materials (such as TiO 2 ) also has the following main problems: first, the light absorption wavelength range of semiconductors is mainly concentrated in the ultraviolet and near ultraviolet regions, and the utilization rate of solar light energy is low; second, the recombination rate of photogenerated electrons and holes is very high, so that the quantum efficiency is low

Method used

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  • Bismuth ferrite nano fiber material and preparation method thereof
  • Bismuth ferrite nano fiber material and preparation method thereof
  • Bismuth ferrite nano fiber material and preparation method thereof

Examples

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Embodiment 1

[0029] Example 1, BiFeO 3 Preparation of Nanofibrous Materials and Detection of Photocatalytic Activity

[0030] 1. BiFeO 3 Preparation of Nanofibrous Materials

[0031] 1. Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) Add 20ml of N,N-dimethylformamide (DMF, N , N-dimethylformamide), stirred at room temperature for about half an hour until completely dissolved, the solution was colorless and transparent, then added 12.0mmol (2.522g) citric acid (C 6 h 8 o 7 ·H 2 O), after stirring for 1.5 hours, a yellow transparent sol containing iron nitrate and bismuth nitrate was obtained. Then add 2.076 grams of polyvinylpyrrolidone (PVP, M=1300000) to make the final mass percentage concentration 8%, stir for 2 hours to fully mix, and then let it stand for 24 hours to obtain a uniform and viscous precursor with an iron ion concentration of 0.2mol / L body solution.

[0032]2. Transfer the above precursor solution into a 10...

Embodiment 2

[0036] Example 2, BiFeO 3 Preparation of Nanofibrous Materials and Detection of Photocatalytic Activity

[0037] 1. BiFeO 3 Preparation of Nanofibrous Materials

[0038] 1. Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) According to the molar ratio of 1.05:1 (i.e. 8.4 mol or 2.453 grams of bismuth nitrate pentahydrate, 8.0 mol or 3.232 grams of iron nitrate nonahydrate), add it to 20 ml of tetrahydrofuran (THF), stir at room temperature for about half an hour to Dissolve completely, the solution is colorless and transparent, then add 24.0mmol (5.043g) citric acid (C 6 h 8 o 7 ·H 2 O), after stirring for 1.5 hours, a yellow transparent sol containing iron nitrate and bismuth nitrate was obtained. Then add 1.966 grams of polyvinyl alcohol (PEG, M=66000~83600) to make the final mass percentage concentration 4%, stir for 5 hours and mix well, then let it stand for 24 hours to obtain a uniform and viscous precursor w...

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Abstract

The invention discloses bismuth ferrite nano fiber and a preparation method thereof. The preparation method of the bismuth ferrite nano fiber comprises the following steps: 1) using bismuth nitrate or a hydrate thereof and iron nitrate or a hydrate thereof as raw materials, dissolving the two raw materials in a solvent, adding a complexing agent, stirring to obtain bismuth ferrite sol, then adding a polymer as a spinning aid in the bismuth ferrite sol, and stirring evenly to obtain a precursor solution; 2) performing electrostatic spinning of the precursor solution to obtain bismuth ferrite precursor fiber; and 3) performing heat treatment of the bismuth ferrite precursor fiber to remove the polymer to obtain the bismuth ferrite nano fiber. In the BiFeO3 (bismuth ferrite) nano fiber prepared by the preparation method, crystal grains of the fiber are arranged along the axial direction to form a bamboo-joint-like structure. The bismuth ferrite nano fiber has a narrow forbidden bandwidth (2.1-2.3 eV), a high utilization rate of visible light, a large specific surface area and few crystal boundaries and crystal faces, can effectively improve the separation of photogenerated carriers and reduce the recombination rate of photogenerated electrons and holes, has a high quantum efficiency, and shows more excellent photocatalytic properties than nanoparticles.

Description

technical field [0001] The invention relates to a bismuth ferrite nanofiber material and a preparation method thereof. Background technique [0002] With the emergence of worldwide energy crisis and environmental degradation, energy and the environment are two important challenges faced by human beings in the 21st century and need to be solved urgently. The Outline of the National Twelfth Five-Year Plan pointed out that it is necessary to accelerate the construction of a resource-saving and environment-friendly society and improve the level of ecological civilization. Therefore, it is an urgent and urgent task to explore, research, develop and utilize new energy resources. How to use solar energy, the cleanest and abundant energy in nature, has attracted the attention of many researchers in the fields of physics, chemistry, materials and environment. Research related to photocatalysis emerged and developed rapidly. Thousands of research papers are published every year, inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01D5/00D01D10/02B01J23/843B01J35/06
Inventor 林元华刘海洋郑斌南策文沈洋杨小平
Owner TSINGHUA UNIV
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