Mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle (SiO2@ FeOOH@ Fe) and preparation method and application thereof

A technology of mesoporous silica and nano-zero valent iron is applied in chemical instruments and methods, restoration of polluted soil, water pollutants, etc. Good fluidity and good dispersion effect

Active Publication Date: 2012-10-03
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as far as the current reports are concerned, there are very few research reports on the preparation and application of nano-zero-valent iron and new carrier mat

Method used

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  • Mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle (SiO2@ FeOOH@ Fe) and preparation method and application thereof
  • Mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle (SiO2@ FeOOH@ Fe) and preparation method and application thereof
  • Mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle (SiO2@ FeOOH@ Fe) and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] SiO 2 Preparation method 1 of FeOOHFe:

[0031] (1) Synthesis of mesoporous silica microspheres

[0032] Dissolve 0.22g of dodecylamine in 50ml of ethanol aqueous solution ([EtOH]=50 vol%), stir and mix evenly, then slowly add 1.1g of ethyl orthosilicate dropwise, continue to stir for 30s, and stand at room temperature 3 hours; centrifuge the obtained product (3000rpm, centrifuge for 5min), wash with water and ethanol for 3 times respectively, and dry in a vacuum oven at 60°C for 6 hours; then place the dried product in a muffle furnace , the temperature was raised to 600° C. at a rate of 1° C. / min, and kept for 4 hours to obtain mesoporous silica microspheres.

[0033] (2) Surface modification of mesoporous silica microspheres

[0034] Prepare 50ml of an aqueous solution containing 0.5g of polyethylene glycol, and add 0.6g of FeSO4 7H2O to the solution, sonicate for 10 minutes to make it dissolve evenly; cook the mesoporous silica microspheres in a water bath at 60°...

Embodiment 2

[0039] SiO 2 Preparation method 2 of FeOOHFe:

[0040] (1) Synthesis of mesoporous silica microspheres

[0041] Dissolve 0.25g of dodecylamine in 50ml of ethanol aqueous solution ([EtOH]=50 vol%), stir and mix evenly, then slowly add 1.2g of ethyl orthosilicate dropwise, continue to stir for 30s, and stand at room temperature 4 hours; the obtained product was centrifuged (3000rpm, centrifuged for 5min), washed with water and ethanol three times respectively, and dried in a vacuum oven at 70°C for 5 hours; then the dried product was placed in a muffle furnace for 5 The ramp rate of °C / min was increased to 600 °C and maintained for 5 hours.

[0042] (2) Surface modification of mesoporous silica microspheres

[0043] Prepare 50ml of an aqueous solution containing 1g of polyethylene glycol, and add 1.5g of FeSO to the solution 4 ·7H 2 After O, sonicate for 20 minutes to make it dissolve evenly; then immerse 0.6g of mesoporous silica microspheres in the above solution, take it...

Embodiment 3

[0048] SiO 2 Preparation method 3 of FeOOHFe:

[0049] (1) Synthesis of mesoporous silica microspheres

[0050] Dissolve 0.28g of dodecylamine in 50ml of ethanol aqueous solution ([EtOH]=50 vol%), stir and mix evenly, then slowly add 1.2g of ethyl orthosilicate dropwise, continue to stir for 60s, and stand at room temperature 5 hours; the obtained product was centrifuged (3000rpm, centrifuged for 5 minutes), washed with water and ethanol for 3 times, and dried in a vacuum oven at 80°C for 4 hours; then the dried product was placed in a muffle furnace, The temperature was raised to 600°C at a rate of 10°C / min and kept for 5 hours.

[0051] (2) Surface modification of mesoporous silica microspheres

[0052] Prepare 50ml of an aqueous solution containing 1g of polyethylene glycol, and add 1.2g of FeSO to the solution 4 ·7H 2 After O, sonicate for 30 minutes to make it dissolve evenly; then immerse 0.6g of mesoporous silica microspheres in the above solution, take it out afte...

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Abstract

The invention discloses a mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle and a preparation method thereof. The mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle has a structure as follows: the center is mesoporous SiO2, the middle layer is FeOOH, the surface of the outermost layer is coated with FeO, and ultimately a SiO2@ FeOOH@Fe structure, namely a spherical particle, is formed. The preparation method is easy to operate and mild in reaction conditions, can be carried out at room temperature and normal pressure, and is short in time consumption and low in energy consumption; the prepared mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticles have the particle size of 400-500nm and are spherical particles; the specific surface areas of the prepared mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticles are detected to be 383.477m2/g by a BET-N2 specific surface area analysis method; and the prepared mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticles are good in lattice morphology, good in fluidity and good in dispersion and can be used for decomposing organic pollutants in the environment.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials in environmental engineering, in particular to a kind of mesoporous silica microsphere loaded nanometer zero-valent iron particles (SiO 2 FeOOHFe) and its preparation method. Background technique [0002] At present, nano-zero-valent iron has become a promising environmental functional material due to its high specific surface area, strong reactivity, excellent in-situ repair and environmental friendliness. In different environmental media, such as water and soil, it shows excellent effects on the degradation and removal of toxic and harmful substances such as dyes, organic halogenated substances, and heavy metals. However, due to its own quantum effect and surface effect, the particles of nano-zero-valent iron are easily aggregated through van der Waals force and magnetic attraction, and are easy to aggregate into micron, millimeter or even larger partic...

Claims

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Application Information

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IPC IPC(8): C02F1/00B09C1/08C02F101/30C02F101/36
Inventor 方战强邱心泓
Owner SOUTH CHINA NORMAL UNIVERSITY
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