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Core-shell type magnetic mesoporous nano-microsphere as well as preparation method and application thereof

A technology of nano-microspheres and core-shells, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., to achieve the effect of large adsorption capacity and low dosage

Inactive Publication Date: 2011-11-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, core-shell magnetic mesoporous nanospheres with mesoporous carbon materials as shells have rarely been reported, and such magnetic core-shell nanomaterials with ordered mesoporous carbon materials as shells have not been reported yet.

Method used

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  • Core-shell type magnetic mesoporous nano-microsphere as well as preparation method and application thereof
  • Core-shell type magnetic mesoporous nano-microsphere as well as preparation method and application thereof
  • Core-shell type magnetic mesoporous nano-microsphere as well as preparation method and application thereof

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preparation example Construction

[0026] (2) Preparation of ferric oxide nanoparticles: 0.02molL -1 The ferric chloride was aged at 100°C for 48 hours, then centrifuged at 6000 rpm to obtain a red precipitate, which was washed three times with water and ethanol respectively, and finally dissolved in water to obtain ferric oxide nanoparticles with a diameter of 100nm-150nm aqueous solution.

[0027] (3) Iron oxide coated with silicon dioxide (FeO x @nSiO 2 ) preparation: Dissolve 0.3g ferric oxide or ferric oxide nanoparticles in a mixed solution of 160ml ethanol and 40ml water, ultrasonic for 10 minutes, then place the mixed solution in a 250ml round bottom flask, mechanically stir Add 3.5ml of ammonia water with a mass concentration of 25%-28%, stir for 15 minutes, add 1ml-2ml tetraethoxysilane, continue stirring for 6-10h, and finally wash the obtained product three times with water and ethanol, namely Get FeO with a diameter of 100nm-380nm x @nSiO 2 .

[0028] (4) FeO x @nSiO 2 @mSiO 2 Preparation ...

Embodiment 1

[0029] Embodiment 1, preparation of core-shell magnetic mesoporous carbon nanospheres (RTMMCs)

[0030] (1) Mesoporous carbon / FeO x @nSiO 2 @mSiO 2 Preparation of complex

[0031] Add 60wt% furfural in trimethylbenzene dropwise to 1g FeO x @nSiO 2 @mSiO 2 In the template material, stop adding when it is just completely wet, then dry it in vacuum below 50°C, repeat this step twice, then put it in an oven at 50°C for two days, and then bake and cure at 90°C for one day. Then put it under the protection of argon for calcination and carbonization at 700°C for 8 hours to obtain mesoporous carbon / FeO x @nSiO 2 @mSiO2 Complex;

[0032] (2) Preparation of core-shell magnetic mesoporous carbon nanosphere RTMMCs

[0033] mesoporous carbon / FeO x @nSiO 2 @mSiO 2 The complex was dissolved in 100ml 5Wt% sodium hydroxide aqueous solution (mesoporous carbon / FeO x @nSiO 2 @mSiO 2 The mass fraction ratio of the composite to sodium hydroxide was 1:5), refluxed for 3 hours, and the...

Embodiment 2

[0035] Embodiment 2, preparation of core-shell magnetic mesoporous carbon nanospheres (RTMMCs)

[0036] (1) Mesoporous carbon / FeO x @nSiO 2 @mSiO 2 Preparation of complex

[0037] With the step in the step (1) of embodiment 1, difference is: the concentration of the trimethylbenzene solution of furfural is 20Wt%.

[0038] (2) Preparation of core-shell magnetic mesoporous carbon nanosphere RTMMCs

[0039] Same as the steps in step (2) of Example 1, the diameter of RTMMCs is 350nm, and the pore size is 3nm.

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Abstract

The invention discloses a core-shell type magnetic mesoporous nano-microsphere as well as a preparation method and application thereof. The method comprises the following steps: (1) moistening, solidifying and carbonizing a FeOx@nSiO2@mSiO2 template in a carbon-source solution to prepare a mesoporous carbon / FeOx@nSiO2@mSiO2 composite, wherein the FeOx@nSiO2@mSiO2 template is a core-shell type mesoporous nano-microsphere taking a silicon dioxide coated iron oxide as a core and mesoporous silicon dioxide as a shell, and the iron oxide is ferroferric oxide or ferric oxide; and (2) performing a reaction between the mesoporous carbon / FeOx@nSiO2@mSiO2 composite and sodium hydroxide to prepare the core-shell type magnetic mesoporous nano-microsphere. The core-shell type magnetic mesoporous nano-microsphere prepared in the invention has the advantages of quickness, convenience, large adsorption volume and less dosage in adsorbing and removing microcystin in water, so that a quick and convenient way is provided for water pollutant removal.

Description

technical field [0001] The invention relates to a core-shell magnetic mesoporous nano-microsphere and a preparation method and application thereof. Background technique [0002] As a very important class of magnetic composite materials, magnetic mesoporous nanospheres with a core-shell structure have shown exceptional advantages in research fields such as catalysis, adsorption, chromatographic separation, chemical sensors, and biomedicine due to their unique structures and properties. and broad application prospects. Among them, the core-shell nanomaterials with magnetic iron ferric oxide nanoparticles as the core and mesoporous silica as the shell have developed rapidly in recent years and become a hot spot in the research field. However, mesoporous silica is unstable and easy to dissolve under alkaline conditions, which limits the practical application of this material. [0003] As another family of mesoporous materials, mesoporous carbon materials show abnormal stabilit...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28
Inventor 江龙张兴华张建平
Owner INST OF CHEM CHINESE ACAD OF SCI
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