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Process for producing nano-Ni/Fe bimetallic material

A bimetallic and nanotechnology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, water/sewage treatment, etc., can solve problems such as low reactivity, low degree of chlorination, strong toxicity, etc. , to achieve the effect of economical preparation method, fast dechlorination speed and low cost

Inactive Publication Date: 2009-05-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 2. When zero-valent iron particles degrade chlorinated hydrocarbons, the reactivity is low, DCM (dichloromethane) cannot be effectively degraded, and there is a lower degree of chlorination and the formation and accumulation of more toxic intermediate products (Gillham R W, et al . Ground Water. 1994, 32: 958-967)
However, palladium is a precious metal, and the engineering application cost is relatively high

Method used

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  • Process for producing nano-Ni/Fe bimetallic material
  • Process for producing nano-Ni/Fe bimetallic material
  • Process for producing nano-Ni/Fe bimetallic material

Examples

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preparation example Construction

[0044] The preparation method of the nano-Ni / Fe double metal of the present invention comprises the following steps: first prepare the nano-iron particles, add the ethanol aqueous solution of the water-soluble Fe salt into the container, and add NaBH into the container under stirring 4 aqueous solution to obtain black nano-iron particles, and wash the nano-iron particles with dilute HCl and deoxygenated deionized water successively under a nitrogen environment for 3 to 5 times; then, soak the above-mentioned nano-iron particles in an ethanol aqueous solution of water-soluble Ni salt, and obtain Wash with absolute ethanol for 3 to 5 times; filter and dry to make nano Ni / Fe bimetallic material.

[0045] Said method prepares nano-iron and nano-Ni / Fe step, the solvent used in the soluble Fe salt or Ni salt solution is the aqueous solution of 0~60% volume ethanol, the nano particle size that the ethanol solution of different volume percentages makes is different, Such as figure 1 ...

Embodiment 1

[0047] The preparation of embodiment 1 nanometer Fe

[0048] 1.0mol / L FeCl 3 ·6H 2 O ethanol-water solution (containing v / v = 30% absolute ethanol) was placed in a closed system, and inflated with high-purity nitrogen for 2 hours to remove dissolved oxygen in the solution. 1.6mol / L NaBH 4 Slowly add the aqueous solution to an equal volume of 1.0mol / L FeCl 3 ·6H 2 O solution, treat all NaBH 4 After the solution is added, the reaction is continued for another 5 minutes to prepare nano-iron particles. Fe 3+ It is reduced and precipitated, and the reaction equation is:

[0049] 4Fe 3+ +3BH 4- +9H 2 O→4Fe 0 ↓+3H 2 BO 3 - +12H + +6H 2 ↑ (1)

[0050] Wash the prepared nano-Fe successively with 0.5 mol / L HCl and deoxygenated deionized water for 3 to 5 times, and all the above operations are carried out in nitrogen flow.

[0051] Microscopic Morphology of Synthetic Materials:

[0052] (1) figure 2 Shown is the transmission electron microscope spectrum (TEM) of the ...

Embodiment 2

[0055] Example 2 The preparation of nano-Ni / Fe bimetallic material with Ni content of 2%

[0056] Take by weighing the nano-Fe that 0.4g embodiment 1 prepares, with 30mL281mg / L NiCl 2 Soak in ethanol-water solution (containing v / v=30% absolute ethanol) for 10min, due to Ni 2+ It is reduced and deposited on the surface of iron, so that a thin layer of Ni can be plated on the surface of Fe. Reaction equation:

[0057] Ni 2+ +Fe→Ni↓+Fe 2+ (2)

[0058] The resulting solid precipitate was washed with absolute ethanol for 3 to 5 times, then filtered through a Bush funnel with a built-in 0.2 μm filter membrane, and finally the black particles were transferred to a reaction bottle and baked at 100°C for 4 hours to obtain nano-Ni / Fe bismuth metallic material. As measured by atomic absorption method, the Ni content was 2.05%.

[0059] The specific surface area of ​​the nanometer Ni / Fe bimetallic that adopts nitrogen adsorption method (Autosorb-1 type specific surface and poro...

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Abstract

The invention provides a method for preparing nano-sized Ni / Fe duplex metal, which comprises the following steps: firstly, preparation of iron nanoparticles: adding an ethanol aqueous solution of water-soluble Fe salts in a container, adding an aqueous solution of NaBH4 into the container under stirring in the presence of nitrogen gas to obtain black iron nanoparticles, and washing with diluted HCl and deoxygenated and deionized water for 3 to 5 times in the presence of nitrogen gas; then, soaking the iron nanoparticles in an ethanol aqueous solution of water-soluble Ni salts, and washing the resulting particles with anhydrous alcohol for 3 to 5 times; and finally, filtering and oven-drying to obtain the final product of nano-sized Ni / Fe duplex metal.

Description

technical field [0001] The invention relates to a preparation method of a dechlorination material used for degrading halogenated hydrocarbons in water, in particular to a preparation method of a nanometer Ni / Fe bimetallic material. Background technique [0002] The research on the application of "zero-valent iron technology" to water treatment started very early, but due to the following two important factors, the application of this technology is seriously restricted: [0003] 1. This technology requires a very long hydraulic retention time, usually 10 to 18 hours; [0004] 2. When zero-valent iron particles degrade chlorinated hydrocarbons, the reactivity is low, DCM (dichloromethane) cannot be effectively degraded, and there are intermediate products with a lower degree of chlorination and more toxic formation and accumulation (Gillham R W, et al . Ground Water. 1994, 32:958-967). [0005] Nanoparticles have attracted much attention because of their high specific surfac...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/745C02F1/58A62D3/30A62D101/22
Inventor 刘菲黄园英陈鸿汉何江涛钟佐燊沈照理
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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