Method for preparing magnetic chrysotile nanotube

A chrysotile and nanotube technology, which is applied in the field of preparation of chrysotile nanotubes, can solve problems affecting performance, weak magnetism, etc., and achieve the effect of improving chemical stability

Active Publication Date: 2013-12-25
HEFEI UNIV OF TECH
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  • Claims
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Problems solved by technology

But its magnetism is weak, such as Ni-doped 2+ The saturation magnetization of chrysotile nanotubes is 9.3×10 -4 A·m 2 kg -1 , doped with Cr 3+ The saturation magnetization of the chrysotile nanotubes is 2.0×10 -4 A·m 2 kg -1 , seriously affecting its practical performance

Method used

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  • Method for preparing magnetic chrysotile nanotube
  • Method for preparing magnetic chrysotile nanotube
  • Method for preparing magnetic chrysotile nanotube

Examples

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Effect test

Embodiment 1

[0027] 1. Add precipitated hydrated silica, industrial light magnesia, ferrous sulfate and water into the reaction kettle, stir and mix evenly under the protection of nitrogen to obtain a mixed solution; the mass concentration of silicon dioxide in the mixed solution is 4.5%. The mass concentration of magnesium is 2.3%, and the mass concentration of ferrous iron is 3.2%.

[0028] 2. Add sodium hydroxide solution to the mixture to adjust the pH value to 11, then move it to a high-pressure reactor, react at 240°C for 24 hours under airtight conditions, and then filter it, and wash the filter cake with water until the pH value is 7.6 , and then dried at 105° C. for 2 hours to obtain magnetic chrysotile nanotubes, whose saturation magnetization was measured to be 5.48 emu / g.

Embodiment 2

[0030] 1. Add fumed white carbon black, hydrated basic magnesium carbonate, ferrous chloride and water into the reaction kettle, stir and mix evenly under the protection of nitrogen to obtain a mixed solution; the mass concentration of silicon dioxide in the mixed solution is 8.9%, oxidized The mass concentration of magnesium is 2.9%, and the mass concentration of ferrous iron is 8.1%.

[0031] 2. Add sodium hydroxide solution to the mixed solution to adjust the pH value to 13, then move it to a high-pressure reactor, react at 190°C for 72 hours under airtight conditions, and then filter it, and wash the filter cake with clean water until the pH value is 7.9 , and then dried at 60° C. for 10 hours to obtain magnetic chrysotile nanotubes, whose saturation magnetization was measured to be 12.78 emu / g.

Embodiment 3

[0033] 1. Add silica sol, flame-retardant magnesium hydroxide, ferrous oxalate and water into the reaction kettle, stir and mix evenly under nitrogen protection to obtain a mixed solution; the mass concentration of silicon dioxide in the mixed solution is 21.4%, and that of magnesium oxide The mass concentration is 19.2%, and the mass concentration of ferrous iron is 3.0%.

[0034] 2. Add sodium hydroxide solution to the mixed solution to adjust the pH value to 12, then move it to a high-pressure reactor, react at 210°C for 48 hours under airtight conditions, and then filter it, and wash the filter cake with water until the pH value is 8.3 , and then dried at 80° C. for 6 hours to obtain magnetic chrysotile nanotubes, whose saturation magnetization was measured to be 8.03 emu / g.

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Abstract

The invention discloses a method for preparing a magnetic chrysotile nanotube. The method comprises the following steps: adding amorphous silica, a magnesium compound, a bivalent iron salt and water into a reaction kettle under the protection of nitrogen, and uniformly mixing the ingredients to obtain a mixed solution, wherein the mass concentration of the amorphous silica in the mixed solution is 2-25%, the mass concentration of the magnesium compound is 1-20%, and the mass concentration of the bivalent iron salt is 0.2-15%; adding a sodium hydroxide solution into the mixed solution to regulate the pH value to 10-13.5, and then, transferring the solution into a high-pressure reaction kettle, reacting for 12-72 h at 180-240 DEG C under a sealed condition, filtering, washing and drying the product after the reaction to obtain the magnetic chrysotile nanotube. The magnetic chrysotile nanotube prepared by the method has strong magnetism, and the specific magnetism of the magnetic chrysotile nanotube is 12.78 A.M2.kg<-1>.

Description

1. Technical field [0001] The invention relates to a preparation method of a magnetic chrysotile nanotube, which belongs to the field of nanomaterials. 2. Technical background [0002] Since the discovery of carbon nanotubes, nanotubes and their assembled products have attracted the attention of many scholars at home and abroad in the basic and potential application research of nanomaterials, and have successively synthesized a variety of nanotubes, such as TiO 2 Nanotube, WO 3 Nanotube, SiO 2 nanotubes, chrysotile nanotubes, etc. Compared with powder, nanotubes have a larger specific surface area and stronger adsorption capacity, and have important application prospects in the fields of adsorption, separation, and catalysis. [0003] Although nanotubes have many excellent properties, due to their small particle size, there are problems such as separation difficulties in liquid phase systems. Therefore, in recent years, magnetic nanotubes have also attracted extensive at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/22H01F1/11B82Y30/00B82Y40/00
Inventor 于少明程磊磊
Owner HEFEI UNIV OF TECH
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