Cladding nanometer iron stable in air and preparation method thereof

A coated nano-iron technology, applied in the nanometer field, can solve problems such as not being fully developed, and achieve the effects of good contact, simple equipment, and good market prospects

Inactive Publication Date: 2009-11-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research in this area has not been fully carried out, and there are few studies on in-situ coating of nanoparticles, and the preparation method of coated nano-iron particles that can exist stably in the air has not yet been reported.

Method used

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  • Cladding nanometer iron stable in air and preparation method thereof
  • Cladding nanometer iron stable in air and preparation method thereof
  • Cladding nanometer iron stable in air and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An air-stable coating type nano iron, which takes nano zero-valent iron particles as the core and is coated with polymethyl methacrylate on its surface. The preparation method includes the following steps:

[0033] (1). Preparation of microemulsion A;

[0034] ① Take 2g cetyltrimethylammonium bromide (CTAB), 1mL n-butanol, 2mL isooctane, and mix with 1mL methyl methacrylate (MMA) and 0.01g azobisisobutyronitrile (AIBN) Uniformly form mixed system A;

[0035] ②Then weigh out 0.002g FeSO 4 ·7H 2 Dissolve O into 2mL deionized water to form FeSO 4 Aqueous solution

[0036] ③Add FeSO to the mixed system A 4 Aqueous solution, ultrasonic dispersion for 1min, the system changed from turbid to clear, and FeSO with monomer and initiator added 4 Reverse microemulsion is microemulsion A.

[0037] (2). Preparation of microemulsion B;

[0038] ① Take 2g cetyltrimethylammonium bromide (CTAB), 1mL n-butanol, 2mL isooctane, and mix with 1mL methyl methacrylate (MMA) and 0.01g azobisisobutyr...

Embodiment 2

[0044] When preparing microemulsion B, NaBH is used 4 Replace KBH 4 That is, the others are the same as in Example 1.

Embodiment 3

[0046] An air-stable coating type nano iron, which takes nano zero-valent iron particles as the core and is coated with polymethyl methacrylate on its surface. The preparation method includes the following steps:

[0047] (1). Preparation of microemulsion A;

[0048] ① Take 8g cetyltrimethylammonium bromide (CTAB), 6mL n-butanol, 16mL isooctane, and mix with 2mL methyl methacrylate (MMA) and 0.02g azobisisobutyronitrile (AIBN) Uniformly form mixed system A;

[0049] ②Then weigh out 0.139g FeSO 4 ·7H 2 Dissolve O in 10mL deionized water to form FeSO 4 Aqueous solution

[0050] ③Add FeSO to the mixed system A 4 Aqueous solution, ultrasonically dispersed for 2 minutes, the system changed from turbid to clear, and FeSO with monomer and initiator added 4 Reverse microemulsion is microemulsion A.

[0051] (2). Preparation of microemulsion B;

[0052] ① Take 8g cetyltrimethylammonium bromide (CTAB), 6mL n-butanol, 16mL isooctane, and mix with 2mL methyl methacrylate (MMA) and 0.02g azobis...

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Abstract

The invention relates to a cladding nanometer iron stable in air and a preparation method thereof. The cladding nanometer iron with stable air uses a nanometer null valence iron particle as a core and is covered with polymethyl methacrylate on the surface. The preparation method comprises the following steps: cetyl trimethyl ammonium bromide (CTAB) is used as a surfactant, normal butanol is a cosurfactant, iso-octane is an oil phase, ferrous sulphate and potassium borohydride water solution are prepared into two microemulsions for a water phase, an oil soluble monomer of methyl methacrylate (MMA) and an initiating agent of azodiisobutyronitrile (AIBN) are added in the two micro-emulsions, after two micro-emulsions are mixed to carry out oxidation-reduction reaction, a reaction system is placed in a water bath with constant temperature, the initiating monomer is polymerized in situ on an oil-water phase interface of the micro-emulsions, and a stable macromolecule cladding layer is formed on an outer layer of the newly-generated nanometer iron particle. The method has simple apparatus and easy and convenient process and has better market prospect.

Description

Technical field [0001] The invention relates to the field of nanotechnology, in particular to an air-stable coated nano iron and a preparation method thereof. Background technique [0002] In recent years, the application of nano zero valent iron to the degradation of environmental pollutants has become a new hot spot. Compared with ordinary iron powder, nano zero valent iron has the characteristics of small particle size, large specific surface area and large surface energy. It has high activity in the reaction of other substances, and the treatment effect is far better than that of ordinary iron powder. The efficient reaction performance of nano materials is used to carry out pollution restoration in a simple, energy-saving, and environmentally friendly way, which is beneficial to the restoration of the ecological environment. And the protection of water resources is of great significance. [0003] There are many methods for synthesizing nano-iron, but the amount of nano-iron u...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B01J13/18
Inventor 王薇金朝晖李铁龙
Owner NANKAI UNIV
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