Magnetic ordered mesopore composite material with cavity structure, synthesis and application

A composite material and magnetic technology, applied in silicon compounds, radioactive purification, alkali metal compounds, etc., can solve the problem of less adsorption sites, and achieve the effect of large specific surface area and pore volume

Inactive Publication Date: 2015-02-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the material can provide fewer adsorption sites

Method used

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  • Magnetic ordered mesopore composite material with cavity structure, synthesis and application
  • Magnetic ordered mesopore composite material with cavity structure, synthesis and application
  • Magnetic ordered mesopore composite material with cavity structure, synthesis and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: CoFe with cavity structure 2 o 4 Preparation of MCM-48 Magnetic Composite Material

[0034] (1) CoFe coated with oleic acid 2 o 4 Synthesis of magnetic nanoparticles: the configured 20mL2mol / L FeCl 3 solution and 20mL of 1mol / L CoCl 2 The solution was mixed and stirred for 30 minutes, then 4 mmol of oleic acid and 16 mL of 3.5 mol / L NaOH solution were added, and the temperature was raised to 80°C under high-speed stirring. Use HCl to adjust the pH of the solution to about 5. After the supernatant and the black precipitate in the lower layer appear, collect the black floc with a magnet, wash with deionized water and absolute ethanol for 3 times, and put it in a 60°C refrigerator. Dry in a vacuum desiccator for 24 hours.

[0035] (2) CTAB stabilized CoFe 2 o 4 Synthesis of magnetic nanoparticles: by the oil-water microemulsion method, take 0.12g of oleic acid-coated cobalt ferrite nanoparticles in 3mL of chloroform, after ultrasonication for 15min, take...

Embodiment 2

[0041] Example 2: The specific implementation steps of this embodiment differ from Example 1 in that acid is used to adjust the pH value of the stock solution after stirring to 9.54; others are the same as Example 1.

[0042] Figure 4 It is the TEM picture of this example. It can be clearly seen from the figure that the silica spheres coat the cobalt ferrite magnetic nanoparticles inside. The silica spheres are evenly distributed, with continuous edges, and the size is between 200 and 400nm. .

Embodiment 3

[0043] Example 3: The specific implementation steps of this embodiment differ from Example 1 in that acid is used to adjust the pH value of the stock solution after stirring to 10.0; others are the same as Example 1.

[0044] Figure 5 It is the TEM picture of this example. It can be clearly seen from the figure that the silica spheres are coated with cobalt ferrite magnetic nanoparticles inside. There are continuous and discontinuous edges of the silica spheres, and the size ranges from 160 to Between 360nm.

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Abstract

The invention discloses a magnetic ordered mesopore composite material with a cavity structure, synthesis and application. The magnetic ordered mesopore composite material is prepared by the following steps: uniformly mixing a cationic surface active agent named cetyl trimethyl ammonium bromide (CTAB) which is modified on surfaces of cobalt ferrite nano particles, and a segmented copolymer EO130PO70EO130(F108) and CTAB in an alcohol-water system at room temperature, adding tetraethoxysilane, stirring to be uniform, adjusting the pH value of a stock solution so as to enable the stock solution to be subjected to hydro-thermal reaction for 24 hours under different pH value conditions, filtering, drying, and roasting so as to prepare the composite material. The microstructure of the composite material is a spherical particle with a cavity structure via observation by a transmission electron microscope; the position of the cavity in a silicon dioxide sphere can be controlled well by adjusting the pH value. The composite material synthesized by the method not only has favorable magnetic property, but also can maintain high specific surface area and pore volume; macro molecules such as proteins can be accommodated in the cavity structure, so that the magnetic ordered mesopore composite material has extremely high application value in the fields of adsorption, separation, catalysis, information storage, biological medicine and the like.

Description

technical field [0001] The invention relates to a magnetically ordered mesoporous composite material with a cavity structure, its synthesis and application. The composite material is used for the adsorption of heavy metal ions such as radionuclides, and belongs to the field of materials. Background technique [0002] In recent years, the pollution of heavy metals to the environment has become increasingly serious, which has caused great harm to humans, animals and plants. Among them, uranium (Ⅵ) is not only a heavy metal, but also a radionuclide. If uranium exists in the environment, it will seriously threaten the health of the environment and organisms. [0003] In the prior art, porous materials are often used to adsorb and remove uranium (VI) in water, mainly using the adsorption sites provided by the porous materials. For example, Document 1 (Xinghui Wang et al. Annals of Nuclear Energy, 2013, 56, 151-157) uses SBA-15 to adsorb uranium (VI) in the solution. The disadva...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30G21F9/12G21F9/20
CPCB01J20/103B01J20/28009B01J20/28083B01J20/3085B01J2220/4806G21F9/12G21F9/20
Inventor 颜学武李云开李兵
Owner NANJING UNIV OF SCI & TECH
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