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HPAA nano-iron particle dispersing method

A nano-iron and particle technology, applied in the field of nano-iron particle preparation, can solve the problems of high operating conditions, small nano-iron particle size, inconvenient use, etc., and achieve easy process control, small particle size, and solution to agglomeration Effect

Inactive Publication Date: 2013-09-04
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

[0025] Prepare dispersed nano-iron particles, the preparation steps are:

[0026] (1) Weigh ferric chloride, dissolve it in distilled water, and make a solution with an iron ion concentration of 0.8 mol / liter;

[0027] (2) Add surfactant soluble starch to the solution obtained in (1) to make its concentration reach 0.4 g / liter, add complexing agent citric acid to make its concentration reach 0.004 g / liter;

[0028] (3) Dilute the stock solution of HPAA (2-hydroxyphosphoroacetic acid) 100 times and add it to the solution obtained in (2) to make the mass concentration reach 0.05%.

[0029] (4) Dissolve sodium borohydride in distilled water to prepare a solution with a sodium borohydride content of 0.02 mol / liter;

[0030] (5) When the solution obtained in (3) is in a stirring state, drip the solution (4) into the reduction reaction at a rate of 5 ml / s, and control the temperature at 20 degrees Celsius during the reaction until the reaction is complete;

[0031] (6) After the r...

Embodiment 2

[0034] Prepare dispersed nano-iron particles, the preparation steps are:

[0035] (1) 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;

[0036] (2) Add surfactant soluble starch to the solution obtained in (1) to make its concentration reach 0.2 g / liter, add complexing agent citric acid to make its concentration reach 0.002 g / liter;

[0037] (3) Dilute the stock solution of HPAA (2-hydroxyphosphoroacetic acid) 100 times and add it to the solution obtained in (2) to make the content reach 1:1000 (volume ratio);

[0038] (4) Dissolve sodium borohydride in distilled water to prepare a solution with a sodium borohydride content of 0.02 mol / liter;

[0039] (5) When the solution obtained in (3) is in a stirring state, drip the solution (4) into the reduction reaction at a rate of 5 ml / s, and control the temperature at 20 degrees Celsius during the reac...

Embodiment 3

[0043] Prepare dispersed nano-iron particles, the preparation steps are:

[0044] (1) Weigh ferrous chloride, dissolve it in distilled water, and make a solution with an iron ion concentration of 1.6 mol / liter;

[0045] (2) Add surfactant soluble starch to the solution obtained in (1) to make its concentration reach 0.4 g / liter, add complexing agent citric acid to make its concentration reach 0.004 g / liter;

[0046] (3) Dilute the stock solution of HPAA (2-hydroxyphosphoroacetic acid) 100 times and add it to the solution obtained in (2) to make the mass concentration reach 0.05%;

[0047] (4) Weigh potassium borohydride and dissolve it in distilled water to prepare a solution with a potassium borohydride content of 0.02 mol / liter;

[0048] (5) When the solution obtained in (3) is in a stirring state, drip the solution (4) to carry out the reduction reaction at a rate of 10 ml / s, and control the temperature at 20 degrees Celsius during the reaction until the reaction is comple...

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Abstract

The invention discloses an HPAA nano-iron particle dispersing method and relates to an iron particle dispersing method. The nano-iron particle material prepared with the method belongs to nomo-metal materials prepared with the chemical method. According to the HPAA nano-iron particle dispersing method, soluble ferrous iron or trivalent iron is dissolved in distilled water (or mixed liquor of distilled water and ethyl alcohol) in a salting-in mode by adding of a certain dispersing agent and with the liquid phase chemical reduction method to form ferric salt solution, iron ions are then directly reduced to zero-valent iron by means of a reducing agent with a strong reducing property such as hydroboron, the product obtained in this way is treated with vacuum drying after being filtered and washed, and then a nano-iron powder material with good dispersing performance and a nanometer microstructure is obtained. The nano-iron particle prepared with the method is spherical, small in diameter, small in particle size range and oxidation resistant. The method is simple and easy to realize, the whole technological process is easy to control, the method can be carried out at normal temperatures and pressures, the problem of agglomeration of nano-iron is solved, and actual production requirements are met.

Description

technical field [0001] The invention relates to a method for preparing nano-iron particles, in particular to a method for dispersing nano-iron particles by HPAA. 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 the small particle size, strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 冯婧微刘宁邵红邵双
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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