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Method for preparing dispersed iron nanoparticles from caprolactam type ionic liquid

A caprolactam-type and ionic liquid technology is applied in the field of preparing caprolactam-type ionic liquid dispersed nano-iron particles, which can solve the problems of high requirements on operating conditions, small particle size of nano-iron, and difficulty in achieving, and achieves easy process control, Small particle size and good dispersion performance

Inactive Publication Date: 2014-02-05
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the small particle size, strong activity, easy coalescence, and easy oxidation of nano-iron, it is often used on the spot and must be isolated from oxygen during preparation and use. It is inconvenient to use and high in cost. Therefore, it is limited in practical applications. At present, the commonly used preparation methods are physical method and chemical method
Some methods are theoretically feasible, but the actual operating conditions are very demanding and not easy to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare dispersed nano-iron particles, the preparation steps are:

[0025] (1) Weigh ferric chloride, dissolve it in distilled water, and make a solution with an iron ion concentration of 0.8 mol / liter;

[0026] (2) Add surfactant soluble starch to the solution obtained in (1) to make its concentration reach 0.4 g / L, add complexing agent citric acid to make its concentration reach 0.004 g / L;

[0027] (3) Dilute the caprolactam-type ionic liquid stock solution by 100 times and add it to the solution obtained in (2) to make the content 0.5:100 (volume ratio);

[0028] (4) Dissolve sodium borohydride in distilled water to form a solution with a sodium borohydride content of 0.02 mol / liter;

[0029] (5) When the solution obtained in (3) is in a stirring state, drip the solution (4) into the reduction reaction at a rate of 1 ml / s, and control the temperature at 20 degrees Celsius during the reaction until the reaction is complete;

[0030] (6) After the reaction in (5), th...

Embodiment 2

[0033] Prepare dispersed nano-iron particles, the preparation steps are:

[0034] Weigh ferric sulfate, dissolve it in a mixed solution of distilled water and absolute ethanol (volume ratio = 7:3), and make a solution with an iron ion concentration of 0.2 mol / L;

[0035] (8) Add surfactant soluble starch to the solution obtained in (1) to make its concentration reach 0.2 g / L, add complexing agent citric acid to make its concentration reach 0.002 g / L;

[0036] (9) Dilute the caprolactam-type ionic liquid stock solution by 100 times and add it to the solution obtained in (2) to make the content 1:25 (volume ratio);

[0037] (10) Weigh sodium borohydride and dissolve it in distilled water to prepare a solution with a sodium borohydride content of 0.02 mol / liter;

[0038] (11) While the solution obtained in (3) is in a stirring state, drop the solution (4) into the reduction reaction at a rate of 10 ml / s, and control the temperature at 20 degrees Celsius during the reaction until...

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Abstract

The invention discloses a method for preparing dispersed iron nanoparticles from caprolactam type ionic liquid, and relates to dispersion and preparation methods for iron particles. The method comprises the following steps of adding a certain dispersing agent to dissolve a soluble ferrous or ferric salt into distilled water (or a mixed solution of distilled water and ethanol) to form an iron salt solution by adopting a liquid-phase chemical reduction method, directly reducing iron ions into zero-valent iron by adopting a reducing agent such as borohydride with high reducibility, and filtering, washing and vacuum-drying a product to obtain an iron nanopowder material with a nanoscale microstructure and higher dispersibility. The iron nanoparticles prepared by the method are spherical, narrow in particle size range and high in dispersibility and purity, and have small and uniform particle sizes and certain oxidation resistance, the problem of high agglomeration rate of the iron nanoparticles is effectively solved, a process is simple and easy to control, and is implemented under normal temperature and normal pressure, and actual production requirements are met.

Description

technical field [0001] The invention relates to a method for preparing iron particles, in particular to a method for preparing caprolactam-type ionic liquid-dispersed nano-iron particles. Background technique [0002] Generally, powders or materials with a particle size in the range of 1 to 100 nanometers (nm) are called nanomaterials. Nanomaterials are widely used in various fields because of their unique properties. Because of its transition region between macroscopic conventional fine powder and microscopic atomic clusters, nano-iron exhibits some unique properties, one of which is the surface effect. Due to its small particle size, large specific surface area, and strong surface activity, nano-iron has more unique advantages than ordinary iron powder in the remediation of pollutants. Many foreign studies have shown that nano-iron can reduce and remove many pollutants in water, such as dissolved organic chlorides, PCBs and nitrobenzene compounds. [0003] Due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 冯婧微王晓丹宁志高
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY