Magnetic nanocomposite fiber and preparation method and application thereof

A composite fiber and magnetic nano technology, applied in the preparation of organic compounds, carboxylate preparation, chemical instruments and methods, etc., to achieve the effect of simple process, short cycle and cheap price

Inactive Publication Date: 2011-04-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the main preparation methods of nanofibers are hydrothermal method, carbon fiber grouting replacement method, chemical vapor deposition method (CVD method), sol-gel method and organogel precursor conversion method, etc. The preparation technology of CaO-iron fiber Program not yet reported

Method used

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  • Magnetic nanocomposite fiber and preparation method and application thereof
  • Magnetic nanocomposite fiber and preparation method and application thereof
  • Magnetic nanocomposite fiber and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 ( CaO / α-Fe Fiber M(CaO):M (α-Fe)=1:1 ）：

[0027] Step 1: get 5.618g calcium nitrate (Ca(NO 3 ) 2 4H 2 O), 9.612g ferric nitrate (Fe(NO 3 ) 3 .9H 2 O), 15g citric acid (CA:C 6 h 8 o 7 ·H 2 O), mixed in 150ml deionized water, Ca 2+ The molar concentration of Fe is 0.159mol / L, Fe 3+ The molar concentration is 0.159mol / L, and the raw material molar ratio is: CA: Fe 3+ : Ca 2+ =3:1:1, then carry out magnetic stirring for 20 hours;

[0028] Step 2: Then put the precursor solution into a vacuum rotary evaporator, depressurize at 60°C, the pressure is less than 0.1Mpa, dehydrate for about 30 minutes, and obtain a gel-like colloidal substance;

[0029] Step 3: Put the gel obtained in step 2 into an oven, dry and dehydrate at 60°C, and place it in the oven for about 1 hour, then pull the gel into gel cellulose filaments, and the cellulose filaments Dry in a crucible at 100°C.

[0030] Step 4: Put the fiber precursor in H 2 , N 2 In the atmosphere...

Embodiment 2

[0031] Example 2 ( CaO / α-Fe Fiber M(CaO):M (α-Fe)=1:1.5 ）：

[0032] Step 1: get 4.214g calcium nitrate (Ca(NO 3 ) 2 4H 2 O), 10.814g ferric nitrate (Fe(NO 3 ) 3 9H 2 O), 15g citric acid (CA:C 6 h 8 o 7 ·H 2 O), mixed in 150ml deionized water, Ca 2+ The molar concentration of Fe is 0.119mol / L, Fe 3+ The molar concentration is 0.178mol / L, and the raw material molar ratio is: CA: Fe 3+ : Ca 2+ =3:1.5:1, then carry out magnetic stirring for 20 hours;

[0033] Step 2: Then put the precursor solution into a vacuum rotary evaporator, depressurize at 60°C, the pressure is less than 0.1Mpa, dehydrate for about 30 minutes, and obtain a gel-like colloidal substance;

[0034]Step 3: Put the gel obtained in step 2 into an oven, dry and dehydrate at 60°C, and place it in the oven for about 1 hour, then pull the gel into gel cellulose filaments, and the cellulose filaments Place in a crucible and dry at 100°C;

[0035] Step 4: Put the fiber precursor in H 2 , N 2 In th...

Embodiment 3

[0036] Example 3 ( CaO / α-Fe Fiber M(CaO):M (α-Fe)=1:2 ）：

[0037] Step 1: get 3.746g calcium nitrate (Ca(NO 3 ) 2 4H 2 O), 12.817g ferric nitrate (Fe(NO 3 ) 3 .9H 2 O), 15g citric acid (CA:C 6 h 8 o 7 ·H 2 O), mixed in 150ml deionized water, Ca 2+ The molar concentration of Fe is 0.106mol / L, Fe 3+ The molar concentration is 0.212mol / L, and the raw material molar ratio is: CA: Fe 3+ : Ca 2+ =4.5:2:1, then carry out magnetic stirring for 20 hours;

[0038] Step 2: Then put the precursor solution into a vacuum rotary evaporator, depressurize at 60°C, the pressure is less than 0.1Mpa, dehydrate for about 30 minutes, and obtain a gel-like colloidal substance;

[0039] Step 3: Put the gel obtained in step 2 into an oven, dry and dehydrate at 60°C, and place it in the oven for about 1 hour, then pull the gel into gel cellulose filaments, and the cellulose filaments Place in a crucible and dry at 100°C;

[0040] Step 4: Put the fiber precursor in H 2 , N 2 In t...

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Abstract

The invention discloses a magnetic nanocomposite fiber and a preparation method and application thereof, and relates to the technical field of inorganic nonmetallic materials and preparation thereof. The preparation method comprises the following steps of: performing chemical reaction on citric acid and metal salt of calcium and iron serving as raw materials to prepare a precursor sol; dehydrating under reduced pressure to obtain a precursor gel; spinning to obtain gel cellulose silk; and calcining the gel cellulose silk under the protection of reducing atmosphere (hydrogen and nitrogen) at aproper temperature to obtain a target product, namely a CaO/alpha-Fe nanocomposite fiber. The fiber has uniform diameter, large length-diameter ratio, high magnetism and a special hollow structure. The method has the advantages of simple process, low equipment requirement, low cost, short operating period and the like. Meanwhile, the magnetic nanocomposite fiber prepared by the method can be usedin transesterification as a solid alkaline catalyst and has high catalytic activity and long catalytic life. The existence of the alpha-Fe component makes the simplification of the separation and recovery of the catalyst possible.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a magnetic nanocomposite fiber, its preparation method and its use in transesterification. Background technique [0002] Solid catalysts have incomparable advantages over traditional homogeneous catalysts due to their non-volatile, non-polluting, non-corrosive equipment, easy recycling, reusable, mild reaction conditions, high yield and selectivity, and easy post-treatment. , excellent and increasingly attracting widespread attention, but the solid catalyst also has the disadvantage of small specific surface area, which makes it difficult to fully contact the reactants, which in turn affects its catalytic effect. [0003] In recent years, with the deepening of nanoscience research, nanotechnology has been more and more used in the field of catalysts. Nanoscale solid catalysts have a large specific surface area, which can effectively improve the catalytic effect. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/06B01J37/18C07C69/003C07C67/08
Inventor 林琳周海宁沈湘黔
Owner JIANGSU UNIV
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