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Preparation method of nano-silver loaded porous silicon dioxide

A technology of porous silica and silica, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the problems of highly toxic modified solvent and complicated modification process, and achieve the integrity of the block, Simple preparation process and good dispersibility

Active Publication Date: 2014-06-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still problems such as complex modification process and highly toxic modified solvent, and when it is applied to liquid chromatography and other fields, the need for complex and repeated loading processes to increase the loading rate is still one of the factors that limit its application.

Method used

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  • Preparation method of nano-silver loaded porous silicon dioxide
  • Preparation method of nano-silver loaded porous silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, a kind of preparation method of nano-silver supported porous silica, carries out following steps successively:

[0033] 1) Add 0.363g of polyethylene oxide with a molecular weight of 10000 and 3ml of methyl orthosilicate to 7.2ml of 0.01mol·L -1 In the hydrochloric acid solution, after magnetic stirring, add 1.375ml of propylene oxide and stir for 50-70min, then put it in a 40℃ oven for 3 days (so as to achieve gelation and aging);

[0034] Replace the liquid on the surface of the formed gel with absolute ethanol (replaced 3 times), so as to obtain the gel after the replacement of absolute ethanol;

[0035] After replacing the absolute ethanol, the gel was dried in an oven at 60°C for 4 days to obtain hierarchical porous silica (SiO 2 hierarchical porous blocks).

[0036] 2) Using aminopropyltriethoxysilane as a modifier and absolute ethanol as a modifying solvent to modify the prepared hierarchical porous silica, specifically:

[0037] Add 2ml of amino...

Embodiment 2

[0046] Embodiment 2, a kind of preparation method of nano-silver supported porous silica,

[0047] Compared with Example 1, only step 2 is changed):

[0048] 2) Add 2.5ml of aminopropyltriethoxysilane as a modifier to 50ml of absolute ethanol, add 0.5g of the prepared hierarchical porous silica, and modify it in an oven at 40°C for 24h; Hierarchical porous silica.

[0049] All the other contents are equal to embodiment 1.

[0050] The scanning electron micrographs of the prepared silver-loaded hierarchical porous silica bulk are the same as figure 2 .

[0051] The silver loading rate in this embodiment 2 is 28.81wt%.

Embodiment 3

[0052] Embodiment 3, a kind of preparation method of nano-silver supported porous silica,

[0053] Compared with Example 1, only step 2 is changed):

[0054] 2) Add 5ml of aminopropyltriethoxysilane as a modifier to 50ml of absolute ethanol, add 0.5g of the prepared hierarchical porous silica, and modify it in an oven at 40°C for 24h; the modified Post-hierarchical porous silica.

[0055] All the other contents are equal to embodiment 1.

[0056] The scanning electron micrographs of the prepared silver-loaded hierarchical porous silica bulk are the same as figure 2 .

[0057] The silver loading rate in this embodiment 3 is 30.81wt%.

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Abstract

The invention discloses a preparation method of nano-silver loaded porous silicon dioxide. The preparation method of nano-silver supported porous silicon dioxide comprises the step of preparing hierarchy porous silicon dioxide by polyoxyethylene, and also comprises the following steps: 1) modifying the hierarchy porous silicon dioxide by taking amino propyl triethoxy silicane as a modifying agent and by adopting absolute ethyl alcohol as a modifying solvent; 2) loading: dissolving silver nitrate into glycol as a reducing agent, and carrying out magnetic stirring so as to obtain a glycol solution of silver nitrate; firstly, cleaning the modified hierarchy porous silicon dioxide obtained in the step 2) with deionized water, and then putting into the glycol solution of silver nitrate, and loading for 48-72 hours in a baking oven at 35-45 DEG C; forming nanoscale silver particles by taking glycol as a reducing agent to reduce silver nitrate; loading the nano silver particles to the modified hierarchy porous silicon dioxide; 3) drying the obtained material in the step 2) after cleaning, thereby obtaining the nano silver loaded porous silicon dioxide.

Description

technical field [0001] The invention belongs to the field of preparation of porous material-loaded nanoparticles, and in particular relates to a method for preparing hierarchical porous silicon dioxide uniformly loaded with silver nanoparticles. Background technique [0002] Hierarchical porous materials prepared by sol-gel accompanied by phase separation have co-continuous macropores and fine mesoporous structures, low relative density, high specific surface area, good permeability and superior adsorption performance, and are widely used for adsorption and separation. , filtration, catalysis and other fields of carrier materials. In recent years, the loading of nano-metal particles into this emerging class of porous bulk materials has become a research hotspot. Among them, silver nanoparticles have been widely used in catalytic reaction, optical conduction, high-efficiency antibacterial, liquid phase separation and other fields. At present, some methods of loading nano-si...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/50B01J37/16B01J20/283B01J20/30C01B33/12
Inventor 郭兴忠于欢杨辉任静谢园
Owner ZHEJIANG UNIV
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