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Method for preparing shell-nucleus type nanometer iron-silver bimetallic granules

A technology of metal particles and nano-iron, which is applied in the coating and other directions, can solve the problems of slow reaction speed, easy oxidation, and easy particle agglomeration, and achieve high purity and yield, high Ag conversion rate, and improved dispersion.

Inactive Publication Date: 2008-02-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use the metal silver covered on the surface to improve the shortcomings of nano-iron powder in this respect: easy to oxidize, easy to agglomerate, slow reaction speed, etc., and solve the problem of easy agglomeration and oxidation of particles in the preparation process through the improvement of the replacement method , low coating rate and other issues, the process is relatively simple, and finally a core-shell nano-iron-silver bimetallic powder with high Ag conversion rate, dispersed particles and no oxidation is obtained

Method used

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  • Method for preparing shell-nucleus type nanometer iron-silver bimetallic granules
  • Method for preparing shell-nucleus type nanometer iron-silver bimetallic granules

Examples

Experimental program
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Effect test

example 1

[0049] Weigh 2g of nano-iron powder (purchased) and place it in a conical flask, wash it with 0.5M dilute hydrochloric acid for 3 times, then wash it with deoxygenated water until neutral; prepare 0.01M silver nitrate aqueous solution, and add 2g polyethylene Pyrrolidone (PVP K-30), stir to make it evenly mixed; under the mixing of the vortex mixer, slowly drop the above-mentioned silver nitrate solution of 50ml into the prepared and washed nano zero-valent iron particles; wait for the silver nitrate solution to drop After the addition, the Erlenmeyer flask was transferred to a water bath shaker, and the reaction was stopped at room temperature (25°C) for 10 minutes; the nanometer iron-silver bimetallic particles were selected by magnetic separation, and then washed three times with ethanol and acetone, and stored in acetone.

[0050] The XRD test results show that the peak values ​​of the diffraction peaks measured in the range of scanning diffraction angles from 25° to 75° a...

example 2

[0054] Weigh 2g of nano-iron powder (purchased) and place it in a conical flask, wash it with 0.5M dilute hydrochloric acid for 3 times, then wash it with deoxygenated water until neutral; prepare 0.02M silver nitrate aqueous solution, and add 2g polyethylene Pyrrolidone (PVP K-30), stir to make it evenly mixed; under the mixing of the vortex mixer, slowly drop the above-mentioned silver nitrate solution of 50ml into the prepared and washed nano zero-valent iron particles; wait for the silver nitrate solution to drop After the addition, transfer the Erlenmeyer flask to a water-bath oscillator, and stop the reaction at room temperature for 10 minutes; select nano-iron-silver bimetallic particles by magnetic separation, wash them with ethanol and acetone for 3 times, and store them in acetone. .

[0055] The XRD test results show that: when the scanning diffraction angle is 25°~75°, the peak values ​​of the measured diffraction peaks are: d=2.357, 2.025, 1.433, compared with the...

example 3

[0059] Weigh 2g of nano-iron powder (purchased) and place it in a conical flask, wash it with 0.5M dilute hydrochloric acid for 3 times, then wash it with deoxygenated water until neutral; prepare 0.03M silver nitrate aqueous solution, and add 2g polyethylene Pyrrolidone (PVP K-30), stir to make it evenly mixed; under the mixing of the vortex mixer, slowly drop the above-mentioned silver nitrate solution of 50ml into the prepared and washed nano zero-valent iron particles; wait for the silver nitrate solution to drop After the addition, transfer the Erlenmeyer flask to a water-bath oscillator, and stop the reaction at room temperature for 10 minutes; select nano-iron-silver bimetallic particles by magnetic separation, wash them with ethanol and acetone for 3 times, and store them in acetone. .

[0060] The XRD test results show that: when the scanning diffraction angle is 25°~75°, the peak values ​​of the measured diffraction peaks are: d=2.359, 2.028, 1.432. Compared with the...

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Abstract

The present invention discloses a stable method for producing core-shell nano-iron and silver double metal grain. The steps is that the nano-iron powder is cleansed with diluted hydrochloric acid to remove the oxidation layer on the surface and cleansed with deoxidation water to a neutral state; 0.01 to 0.1m silver nitrate-water solution is prepared and polyvinylpyrrolidone is added into the solution to mix evenly; the silver nitrate solution is dripped on the nano-iron powder slowly according to the proportion of 25 to 50 ml / lg; after the silver nitrate solution is dripped, the reactant is put on a water bath oscillator for reaction; and at last the magnetic selection method is used to select the core-shell nano-iron and silver double metal grains. With the present invention to produce core-shell nano Fe-Ag double metal powder, the diversity is greatly improved with comparatively high argentification rate and impurities such as iron-silver alloy and ferric oxide will not exist; in this way, the purity and the production rate is comparatively high.

Description

technical field [0001] The invention relates to a preparation method of nano-iron-silver bimetal particles, in particular to a preparation method of core-shell nano-iron-silver bimetal particles. technical background [0002] Since it was proposed in the late 1980s that metal filings can be used for in-situ remediation of groundwater, Fe 0 Reductive degradation has become a hot research field, but in reality, the application of ordinary Fe 0 There are still some defects and bottlenecks in powder degradation of chlorinated organics. Therefore, many researchers at home and abroad try to develop nano-scale iron particles, and use the unique superior properties of nanoparticles to improve Fe 0 The reactivity and treatment efficiency of particles have been widely used in wastewater treatment in recent years, especially for the dechlorination of chlorinated organic compounds. But even nanometer-sized Fe 0 , There are also many problems when degrading organic chlorides such as ...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/16
Inventor 王晓栋罗斯秦良高树梅季力杨旭曙
Owner NANJING UNIV