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A kind of magnetic nanomaterial with surface modified mercapto group and its preparation method and application

A magnetic nanometer and surface modification technology, applied in the fields of inorganic material magnetism, chemical instruments and methods, and other chemical processes, etc., can solve the problems of few surface active sites, low adsorption capacity, poor dispersibility, etc. The effect of sensitive surface area and large specific surface area

Active Publication Date: 2015-09-09
CHINA TOBACCO FUJIAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when dealing with large-volume samples, due to the low adsorption capacity, poor dispersion, and few surface active sites of traditional solid-phase adsorption materials, it takes a long time to achieve the complete adsorption of selenium during the extraction process; It is time consuming to separate the material from the water sample by means of

Method used

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  • A kind of magnetic nanomaterial with surface modified mercapto group and its preparation method and application
  • A kind of magnetic nanomaterial with surface modified mercapto group and its preparation method and application
  • A kind of magnetic nanomaterial with surface modified mercapto group and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment example 1

[0025] Example 1 Synthesis of magnetic nanomaterials with surface-modified mercapto groups

[0026] The synthesis of surface-modified magnetic nanomaterials with mercapto groups is divided into three steps.

[0027] (1) Synthesis of magnetic nanoparticles of ferric oxide by co-precipitation method: 10 g of ferric chloride and 4 g of ferrous chloride were dissolved in 100 mL of distilled water, stirred by a mechanical stirrer, and heated to 70 °C under nitrogen protection. ℃. Then add 10 mL of 10% NH 3 ·H2O, the color of the solution changes from orange red to black immediately. After cooling down to room temperature, the obtained nanoparticles were washed with twice distilled water and 0.02 mol L -1 washed several times with NaCl, and finally stored in distilled water.

[0028] (2) Put the magnetic nanoparticles of Fe3O4 synthesized in step (1) into a 250 mL three-necked flask, add 60 mL of 5% (V / V) TEOS and 60 mL of glycerine, and dissolve the The pH of the mixture was a...

Embodiment example 2

[0030] Example 2 Synthesis of magnetic nanomaterials with surface-modified mercapto groups

[0031] The synthesis of surface-modified magnetic nanomaterials with mercapto groups is divided into three steps.

[0032] (1) Synthesis of magnetic nanoparticles of ferric oxide by co-precipitation method: 12 g of ferric chloride and 6 g of ferrous chloride were dissolved in 200 mL of distilled water, stirred by a mechanical stirrer, and heated to 100 °C under nitrogen protection. ℃. Then add 20 mL of 30% NH 3 ·H2O, the color of the solution changes from orange red to black immediately. After cooling down to room temperature, the obtained nanoparticles were washed with twice distilled water and 0.04 mol L -1 washed several times with NaCl, and finally stored in distilled water.

[0033] (2) Put the magnetic nanoparticles of Fe3O4 synthesized in step (1) into a 250 mL three-neck flask, add 80 mL of 10% (V / V) TEOS and 80 mL of glycerine, and dissolve the The pH of the mixture was a...

Embodiment example 3

[0035] Example 3 Synthesis of magnetic nanomaterials with surface-modified mercapto groups

[0036] The synthesis of surface-modified magnetic nanomaterials with mercapto groups is divided into three steps.

[0037] (1) Synthesis of magnetic nanoparticles of ferric oxide by co-precipitation method: 12 g of ferric chloride and 5 g of ferrous chloride were dissolved in 150 mL of distilled water, stirred by a mechanical stirrer, and heated to 90 °C under nitrogen protection. ℃. Then add 20 mL of 30% NH 3 ·H2O, the color of the solution changes from orange red to black immediately. After cooling down to room temperature, the obtained nanoparticles were washed with twice distilled water and 0.03 mol L -1 washed several times with NaCl, and finally stored in distilled water.

[0038] (2) Put the magnetic nanoparticles of Fe3O4 synthesized in step (1) into a 250 mL three-neck flask, add 80 mL of 10% (V / V) TEOS and 80 mL of glycerine, and dissolve the The pH of the mixture was adju...

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Abstract

The invention discloses a surface modification sulfydryl magnetic nanometer material as well as a preparation method and application of the surface modification sulfydryl magnetic nanometer material and belongs to the technical field of inorganic materials and analysis. The magnetic nanometer material is obtained by firstly adopting coprecipitation to synthesize the magnetic nanometer material and adopting gamma-sulfydryl propyl trimethoxy silane and tetraethoxysilane to carry out surface chemical modification. The material is used as an adsorbent, the specific surface is great, quadrivalent selenium can be selectively adsorbed, and hexavalent selenium is not adsorbed. The material has good application fields in the selenium form analysis field.

Description

technical field [0001] The invention relates to a magnetic nano material whose surface is modified with mercapto groups, and a preparation method and application of the magnetic nano material. Background technique [0002] Selenium is one of the essential trace elements for humans and animals. According to research, if the daily intake of selenium is <0.8 μmol L -1 , can cause Keshan disease, cancer, liver and cardiovascular disease, and the function of the human immune system will also be related to selenium deficiency. However, if the intake is too much, it will cause harm to the human body. An effective way for the human body to supplement selenium is the production of selenium-enriched crops. Therefore, people sprinkle selenium fertilizers on crops to increase people's intake of selenium. However, the toxicity and biological activity of selenium are closely related to its existing form. Generally speaking, the toxicity of inorganic selenium is greater than that of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01B01J20/286B01J20/28B01J20/30
Inventor 黄朝章张建平蔡国华邓其馨刘秀彩吴清辉谢卫许寒春
Owner CHINA TOBACCO FUJIAN IND
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