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Synthetic method of strip porous lanthanum ferrite nano fibers

A nanofiber, synthesis method technology, applied in fiber processing, filament/thread forming, textile and papermaking, etc., can solve the problem of reducing the performance of catalysis and adsorption, easy deactivation of lanthanum ferrite nanoparticles, not very high specific surface area, etc. It can improve the performance of catalysis and adsorption, increase the specific surface area, and achieve the effect of large specific surface area.

Inactive Publication Date: 2014-05-14
山西师范大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The lanthanum ferrite nanoparticles prepared by the traditional citric acid method are easy to deactivate, easy to agglomerate, and difficult to recycle, which reduces the specific surface area, thereby reducing the performance of catalysis and adsorption.
However, most of the lanthanum ferrite nanofibers synthesized by electrospinning are nanowires and nanotubes, and the specific surface area is not very high, which affects some of its practical properties.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] 0.5g Fe(NO 3 ) 3 9H 2 O and La(NO 3 ) 3 ·6H 2 O was dissolved in a mixed solution of 1 mL ethanol and 1 mL acetic acid, and stirred at room temperature for 1 h with a magnetic stirrer to form a mixed solution A. Then 2 g of polyvinylpyrrolidone was dissolved in 5 mL of ethanol, and stirred at room temperature for 2 h to form solution B. Finally, the mixed solution A was slowly added to the solution B with a dropping funnel, and stirred at room temperature for 6 h to form a precursor solution C. Add the precursor solution into the syringe, connect the negative electrode of the high-voltage power supply to the receiver, and connect the positive electrode to the stainless steel needle of the syringe for spinning. The collected composite fibers are dried and calcined.

Embodiment 2

[0023] 0.4 g of C with a molar ratio of 1:1 15 h 21 FeO 6 and La(CH 3 COO) 3 1.5H 2 O was dissolved in 2 mL of acetic acid and stirred at room temperature for 1 h with a magnetic stirrer to form a mixed solution A. Then 1.75g ​​of polyvinylpyrrolidone was dissolved in 5mL of ethanol, and stirred at room temperature for 2h to form solution B. Finally, the mixed solution A was slowly added to the solution B with a dropping funnel, and stirred at room temperature for 6 h to form a precursor solution C. Add the precursor solution into the syringe, connect the negative electrode of the high-voltage power supply to the receiver, and connect the positive electrode to the stainless steel needle of the syringe for spinning. The collected composite fibers are dried and calcined.

Embodiment 3

[0025] 0.6g of C with a molar ratio of 1:1 15 h 21 FeO 6 and La(NO 3 ) 3 ·6H 2 O was dissolved in 2 mL of distilled water and stirred at room temperature for 1 h with a magnetic stirrer to form a mixed solution A. Then 2.25 g of polyvinylpyrrolidone was dissolved in 5 mL of ethanol, and stirred at room temperature for 2 h to form solution B. Finally, the mixed solution A was slowly added to the solution B with a dropping funnel, and stirred at room temperature for 6 h to form the precursor solution C. Add the precursor solution into the syringe, connect the negative electrode of the high-voltage power supply to the receiver, and connect the positive electrode to the stainless steel needle of the syringe for spinning. The collected composite fibers are dried and calcined.

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Abstract

The invention relates to a synthetic method of strip porous lanthanum ferrite nano fibers. The method comprises the following steps: dissolving Fe salt and La salt in mixed liquor of ethanol and acetic acid, and stirring at room temperature to form mixed liquor A; then, dissolving polyvinylpyrrolidone or polyvinyl alcohol in ethanol, and stirring at room temperature to form liquor B; slowing adding the mixed liquor A into the liquor B, and stirring at room temperature to form precursor liquor C; and electrostatically spinning the precursor liquor C to dry and roast the collected compound fibers. The strip porous lanthanum ferrite nano fibers are prepared by adopting an electrostatic spinning method. The strip porous lanthanum ferrite nano fibers have a stable and uniform structure, a large specific surface area, a high aspect ratio and an opened porous structure, so that the many active sites are formed, and performances such as catalysis and adsorption are remarkably improved.

Description

technical field [0001] The invention relates to a method for synthesizing nano-lanthanum ferrite, in particular to a method for synthesizing strip-shaped porous lanthanum ferrite nanofibers by high-voltage electrostatic spinning technology. Background technique [0002] Nanofibers refer to wire (tube) materials that are two-dimensional in the nanometer scale on the three-dimensional space scale of the material, mainly including nanowires, nanowires, nanorods, nanotubes, nanobelts, and nanocables. The biggest feature of nanofibers is the large specific surface area, which leads to increased surface energy and activity, resulting in small size effects, surface or interface effects, quantum size effects, macroscopic quantum tunneling effects, etc., in light, sound, electricity, magnetism, heat, etc. Aspects showed excellent specificity. [0003] Traditional methods for preparing nanofibers include spinning method, template synthesis method, phase separation method, self-assemb...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D5/00D01D5/247
Inventor 李姝丹高昆
Owner 山西师范大学
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