Functionalized meso-porous silia-based material and preparation method and application thereof

A technology of mesoporous silicon and functionalization, which is applied in the field of functionalized mesoporous silicon-based materials. Large size, rich mesopores, outstanding effects

Inactive Publication Date: 2017-03-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this strategy is that due to the large particle size of silicon-based materials and relatively long mesoporous channels, the distribution of modifying groups inside and outside the channels is uneven, and it is difficult to achieve effective modification especially in the depth of the channels.

Method used

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  • Functionalized meso-porous silia-based material and preparation method and application thereof
  • Functionalized meso-porous silia-based material and preparation method and application thereof
  • Functionalized meso-porous silia-based material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A functionalized mesoporous silicon-based material, the steps of its preparation method are as follows:

[0041]The first step: Dissolve 0.5g cetyltrimethylammonium bromide in a mixed solution of 7.5mL ethanol and 7.5mL deionized water, then add 15g ethyl orthosilicate (ethyl orthosilicate and hexadecane The molar ratio of base trimethylammonium bromide is 52.6:1), and 0.2mL concentrated phosphoric acid is added dropwise; Stir at room temperature for 2h to obtain the solution after the pre-hydrolysis reaction;

[0042] Step 2: Add 3 g of an aqueous solution of 50 wt % polyethyleneimine to the solution after the prehydrolysis reaction obtained in the first step to initiate co-condensation and co-precipitation reactions of organic components and inorganic components in the system, and then stir for 3 h; After the reaction, the resulting solid product was filtered out and washed with deionized water and ethanol to obtain a crude product;

[0043] The third step: in order ...

Embodiment 2

[0045] The difference between this example and Example 1 lies in that the addition amount of the aqueous solution of 50wt% polyethyleneimine is 6g.

Embodiment 3

[0047] The difference between this example and Example 1 lies in that the amount of the aqueous solution of 50 wt % polyethyleneimine added is 9 g.

[0048] The functionalized mesoporous silicon-based material prepared in Examples 1 to 3 was characterized by a scanning electron microscope, and the results were as follows figure 2 shown, where figure 2 a, 2b, and 2c respectively correspond to Examples 1-3, and it can be known that the functionalized mesoporous silicon-based materials obtained in Examples 1-3 have different polyethyleneimine contents, but they all consist of particles of 20-100 μm.

[0049] Carry out nitrogen adsorption / desorption test to the functionalized mesoporous silicon-based material prepared in embodiment 1-3, the result is as follows image 3 As shown, the nitrogen adsorption / desorption isotherms are all type IV, indicating that the functionalized mesoporous silicon-based materials obtained in Examples 1-3 have typical mesoporous structure characteri...

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Abstract

The invention discloses a functionalized meso-porous silica-based material. The material is mainly prepared from polymine and silica gel, wherein the mass percentage content of the polymine is 13.2-28.6 wt%, the particle size is 20 micrometers to 100 micrometers, the specific surface area is 250-420 m<2> / g, the distribution range of meso-porous size is 2-15 nanometers, and the most probable pore size is 5.0-5.5 nanometers. The large-particle functionalized meso-porous silica-based material is obtained by combining a sol-gel method and a coprecipitation method for the first time, polymine participates in a hydrolysis-polycondensaiton in the meso-porous silica gel forming process, a target product is directly synthesized, a preparation method is simple, the product can be synthesized on a large scale, and raw materials are cheap and easy to obtain; the functionalized meso-porous silica-based material is large in particle size and large in specific area, has multiple meso-pores, functionalized modified groups are uniform in distribution and high in content, the content of a polymer can reach 28.6 wt%, the material can be adopted as a microminiaturized filling type solid phase extraction absorbent, is a good anion exchange material and is wide in application range and obvious in effect.

Description

technical field [0001] The invention relates to a functionalized mesoporous silicon-based material, and also relates to a preparation method and application of the material, belonging to the field of functional materials. Background technique [0002] Mesoporous silica has the characteristics of large surface area, easy functional modification and good stability, and has a good application prospect in the field of sample pretreatment. As an adsorbent, the size of the material has a decisive influence on the selection of the extraction mode. Nanoparticles are good adsorbents for dispersed SPE; larger particles (>10 μm) can be used as adsorbents for packed SPE. Compared with dispersed solid-phase extraction, packing-type solid-phase extraction does not require tedious and time-consuming high-speed centrifugation steps, and has the characteristics of simple operation, rapidity, and easy miniaturization. Currently, the preparation of functionalized mesoporous silica nanopar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B01J20/10
CPCB01J20/103C01B33/124C01P2004/03C01P2004/61C01P2006/12C01P2006/16
Inventor 朱钢添
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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