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

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

Inactive Publication Date: 2012-12-19
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

Examples

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preparation example Construction

[0026] (2) Preparation of Fe2O3 nanoparticles: 0.02molL -1 The ferric chloride was aged at 100 °C for 48 hours, and then centrifuged at 6000 rpm to obtain a red precipitate. The red precipitate was washed three times with water and ethanol, and finally dissolved in water to obtain ferric oxide nanoparticles with a diameter of 100nm-150nm. aqueous solution.

[0027] (3) Silica-coated iron oxide (FeO x nSiO 2 ) preparation: dissolve 0.3g ferric oxide or ferric oxide nanoparticles in a mixture of 160ml ethanol and 40ml water, ultrasonicate for 10 minutes, then place this mixture in a 250ml round-bottomed flask, stir mechanically Add 3.5ml of ammonia water with a mass concentration of 25%-28%, stir for 15 minutes, add 1ml-2ml of tetraethoxysilane, continue to stir and react for 6-10h, and finally wash the obtained product with water and ethanol three times respectively, namely Obtain FeO with a diameter of 100nm-380nm x nSiO 2 .

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

Embodiment 1

[0029] Example 1. Preparation of Core-Shell Magnetic Mesoporous Carbon Nanoparticles (RTMMCs)

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

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

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

[0033] The mesoporous carbon / FeO x nSiO 2 mSiO 2 The complexes were dissolved in 100 ml of 5Wt% aqueous sodium hydroxide solution (mesoporous carbon / FeO x nSiO 2 mSiO 2 The mass ratio of the complex to sodium hydroxide is 1:5), refluxed for 3 hours, and then washed twice with ...

Embodiment 2

[0035] Example 2. Preparation of Core-Shell Magnetic Mesoporous Carbon Nanoparticles (RTMMCs)

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

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

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

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

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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