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Fe3O4@SiO2 magnetic nanospheres as well as preparation method and application thereof

A magnetic nanosphere, magnetic technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of small specific surface area of ​​ferric oxide nanoparticles, and the adsorption effect needs to be improved. , to achieve the effect of low cost, large specific surface area and simple process

Inactive Publication Date: 2015-04-01
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although RICE University in the United States has realized the purification of arsenic-containing well water through unembedded ferric oxide nanomaterials, the specific surface area of ​​the ferric oxide nanoparticles used is small, and the adsorption effect needs to be improved, so it has not yet been used on a large scale. application

Method used

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  • Fe3O4@SiO2 magnetic nanospheres as well as preparation method and application thereof
  • Fe3O4@SiO2 magnetic nanospheres as well as preparation method and application thereof
  • Fe3O4@SiO2 magnetic nanospheres as well as preparation method and application thereof

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Experimental program
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Embodiment 1 4

[0043] The preparation of embodiment 1 ferric oxide nanosphere

[0044] First, we used the co-precipitation method to prepare ferric oxide nanoparticles with a particle size of 8nm. The specific method is as follows:

[0045] FeCl 3 ·6H 2 O (0.4g, 1.4mmol) and FeSO 4 ·7H 2 O (0.2g, 0.7mmol), dissolved in 20mL of deionized water, ultrasonic 15min to remove oxygen.

[0046] The above solution was placed in a 50°C water bath under N 2 Under protection, after magnetic stirring for 15 min, 5 mL of ammonia water was slowly added dropwise (the dropping rate was 1 mL / min) therein, and the pH was adjusted to about 11, and the temperature was adjusted to 40°C.

[0047] Citric acid (0.16 g) was dissolved in 1 mL of water, added to the above reaction solution, and reacted for 1 h.

[0048] The resulting nanoparticles were prepared and washed twice with ethanol.

Embodiment 2 4

[0049] The preparation of embodiment 2 iron ferric oxide nanospheres

[0050] First, we used the co-precipitation method to prepare Fe3O4 nanoparticles with a particle size of 12nm. The specific method is as follows:

[0051] Will Fe 2 (SO 4 ) 3 (0.28g, 0.7mmol) and Fe(NO 3 ) 2 ·6H 2 O (0.20g, 0.7mmol), dissolved in 20mL of deionized water, ultrasonic 15min to remove oxygen.

[0052] The above solution was placed in a 60°C water bath under N 2 Under protection, after magnetic stirring for 60min, slowly dropwise (dropping speed is 1mL / min) NaHCO 3 Aqueous solution (0.02g / mL, 5mL), adjust the pH to around 10, and raise the temperature to 80°C.

[0053] Citric acid (0.16 g) was dissolved in 1 mL of water, added to the above reaction solution, and reacted for 1 h.

[0054] The resulting nanoparticles were prepared and washed twice with ethanol. Such as image 3 As shown, the average particle size of ferric oxide nanospheres prepared in this example is about 12 nm, and ...

Embodiment 3 4

[0055] The preparation of embodiment 3 iron ferric oxide nanospheres

[0056] First, we used the co-precipitation method to prepare Fe3O4 nanoparticles with a particle size of 12nm. The specific method is as follows:

[0057] FeCl 3 ·6H 2 O (0.4g, 1.4mmol) and Fe (NO 3 ) 2 ·6H 2 O (0.20g, 0.7mmol), dissolved in 20mL of deionized water, ultrasonic 15min to remove oxygen.

[0058] The above solution was placed in a 60°C water bath under N 2 Under protection, after magnetic stirring for 60min, slowly dropwise (dropping speed is 1mL / min) NaHCO 3 Aqueous solution (0.02g / mL, 5mL), adjust the pH to around 10, and raise the temperature to 80°C.

[0059] Citric acid (0.16 g) was dissolved in 1 mL of water, added to the above reaction solution, and reacted for 1 h.

[0060] The resulting nanoparticles were prepared and washed twice with ethanol.

[0061] with NaH 2 PO 4 solution or Na 2 HPO 4 solution instead of NaHCO 3 A solution can achieve the same effect.

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Abstract

The invention discloses Fe3O4@SiO2 magnetic nanospheres as well as a preparation method and application thereof, and belongs to the field of arsenic polluted water treatment. A Fe3O4@SiO2 magnetic nanosphere comprises a magnetic Fe3O4 core and a microporous or mesoporous SiO2 layer wrapping the outside of the Fe3O4 core, wherein the particle size of the Fe3O4 core is 8-100nm, and the thickness of the microporous or mesoporous SiO2 layer is 2-150nm. The preparation method comprises the following steps: (1) preparing the magnetic ferroferric oxide core by adopting a coprecipitation method; and (2) preparing the Fe3O4@SiO2 magnetic nanospheres by adopting an improved stobe method. The preparation method has the advantages of being simple and low in cost; the prepared Fe3O4@SiO2 magnetic nanospheres have large surface areas and high adsorption efficiency on arsenic pollutants; a magnetic material can be repeatedly recovered, and thus the secondary pollution caused by the absorbent material is reduced.

Description

technical field [0001] The invention relates to the field of arsenic-polluted water treatment, in particular to an Fe 3 o 4 SiO 2 Magnetic nanosphere and its preparation method and application. Background technique [0002] Arsenic is widely distributed in the earth's crust, mainly in the form of sulfide minerals, metal arsenates or arsenides. In surface water, arsenic mainly exists in the form of +5 valence; in groundwater and deep lake sediments under reducing conditions, arsenic mainly exists in the form of +3 valence. [0003] At present, arsenic pollution is one of the main killers that endanger human health. When the concentration of arsenic in drinking water exceeds 10 μg L -1 It will lead to chronic poisoning of the human body, and even canceration. Arsenic pollution mainly comes from the mining and smelting of arsenic compounds and some metals. At the same time, glassware manufacturing, wood preservatives, ceramic manufacturing, metallurgical industry, tannerie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28
CPCB01J20/06B01J20/103B01J20/28016B01J20/28054C02F1/281C02F1/288C02F2101/20
Inventor 孙宏浩孙红梅孙玲胡书超
Owner HUBEI UNIV OF TECH
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