Chitosan-coated magnetic mesoporous silica core-shell structure nano-particle and preparation method and application thereof

A technology of mesoporous silica and nanoparticles, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low adsorption capacity and difficult separation of mesoporous silica, To achieve excellent adsorption performance and improve the effect of adsorption capacity

Inactive Publication Date: 2015-07-22
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Gao et al. prepared a chitosan-modified mesoporous silica composite material, and used this composite material to adsorb the dye Acid Red 18, and the adsorption capacity was as high as 232.6 mg / g. However, there was no mesoporous silica modified by chitosan. The adsorption capacity is relatively low
[0006] Although there are many reports on chitosan-encapsulated mesoporous silica and its applications are diverse, there is a common problem of difficult separation.

Method used

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  • Chitosan-coated magnetic mesoporous silica core-shell structure nano-particle and preparation method and application thereof
  • Chitosan-coated magnetic mesoporous silica core-shell structure nano-particle and preparation method and application thereof
  • Chitosan-coated magnetic mesoporous silica core-shell structure nano-particle and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, chitosan-coated magnetic mesoporous silica core-shell nanoparticles were first prepared according to the following steps:

[0038] 1. Preparation of Fe3O4 nanoparticles by co-deposition method

[0039] Take 120mL of distilled water, add 4.80g of ferric chloride hexahydrate and 2.01g of ferrous chloride tetrahydrate after nitrogen gas for 10min, raise the temperature to 70°C, add 10mL of ammonia water with a concentration of 23g / L, stir for 30min, then add 0.85mL of oleic acid, After continuing to react for 2.5 hours, the dispersion liquid of ferric oxide nanoparticles was obtained, separated by a magnet, and the resulting product was washed with water and ethanol successively to obtain ferric oxide nanoparticles, and the ferric oxide nanoparticles were dispersed in chloroform, and the solid The content is 0.1g / mL.

[0040] figure 1 This is the TEM image of ferric oxide nanoparticles dispersed in chloroform obtained in this example. It can be seen f...

Embodiment 2

[0059] In this example, chitosan-coated magnetic mesoporous silica core-shell nanoparticles were prepared in the same manner as in Example 1, except that the amount of iron ferric oxide nanoparticles in step 2 was 0.05 g.

[0060] After characterization, the number of ferric oxide contained in a single chitosan-coated magnetic mesoporous silica core-shell nanoparticle obtained in this example is reduced.

Embodiment 3

[0062] In this example, chitosan-coated magnetic mesoporous silica core-shell nanoparticles were prepared in the same manner as in Example 1, except that the amount of iron ferric oxide nanoparticles in step 2 was 0.15 g.

[0063] After characterization, the number of ferric oxide contained in a single chitosan-coated magnetic mesoporous silica core-shell nanoparticle obtained in this example increases.

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Abstract

The invention discloses a chitosan-coated magnetic mesoporous silica core-shell structure nano-particle and a preparation method and application thereof. The preparation method is characterized by comprising the following steps: preparing a ferroferric oxide nano-particle by using a co-precipitation method; preparing a magnetic silica nano-particle by using a sol-gel method, and removing a pore-foaming agent by using an ion exchange method to obtain a magnetic mesoporous silica nano-particle; performing surface treatment on magnetic mesoporous silica by using a silane coupling agent, and then grafting chitosan to obtain a target product. The ferroferric oxide nano-particle is introduced into the obtained product, so that after adsorption is completed, the product can be quickly separated and recycled through an external magnetic field; the product has an excellent adsorption effect on methylene blue.

Description

technical field [0001] The invention relates to chitosan-coated magnetic mesoporous silica nanoparticles and a preparation method and application thereof, belonging to the field of water treatment. Background technique [0002] Because mesoporous silica has an ordered mesoporous structure, it is widely used to adsorb metal ions, dyes and other organic compounds, and the specific surface area of ​​mesoporous silica is large, making its chemical and physical adsorption process faster. In addition, there are many hydroxyl groups on the pore walls of mesoporous silica, which makes it easy to functionalize mesoporous silica and thus have special properties. [0003] Chitosan is the product of deacetylation of chitin, which has good biodegradability, biocompatibility, low toxicity and renewability. Chitosan is widely used in cosmetics, papermaking, food engineering, medicine, agriculture and sewage treatment. There are a large number of hydroxyl groups and amino groups in the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
Inventor 周艺峰聂王焰陈鹏鹏李影
Owner ANHUI UNIVERSITY
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