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A method for purifying copper nanoparticles

A copper nanoparticle and solution technology, applied in the direction of nanotechnology, can solve the problems of being easily oxidized, hindering the catalytic activity and selectivity of copper nanoparticles, and achieving the effects of low cost, high product purity and simple operation

Inactive Publication Date: 2016-02-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, copper nanoparticles are easily oxidized during catalysis or storage, and copper oxide layers (including copper oxide and cuprous oxide) are formed on the surface, which seriously hinder the catalytic activity and selectivity of copper nanoparticles.

Method used

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  • A method for purifying copper nanoparticles
  • A method for purifying copper nanoparticles
  • A method for purifying copper nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Purification of oxide-containing copper nanoparticles due to insufficient reducing agent (1)

[0024] Add 7.0 grams of anhydrous sodium carbonate to 68 ml of deionized water, use a magnetic stirrer to completely dissolve the anhydrous sodium carbonate, add 4.32 grams of trisodium citrate dihydrate, stir for 15 minutes until completely mixed, and take 0.68 mol / liter five Add 4 ml of copper sulfate hydrate dropwise to the mixed solution, the mixed solution turns from light blue to dark blue, continue stirring for 5 minutes, then add 3.00 g of sodium chloride, stir for 15 minutes until the sodium chloride is completely dissolved, then add 1.5 mol 30 ml of glucose solution per liter, after stirring for 5 minutes, transfer the mixed solution into a three-neck bottle to seal, place the three-neck bottle in a 99°C oil bath and heat for 15 minutes. After the oil bath is cooled to 50°C-60°C, take it out . The product was separated by centrifugation, the sample was was...

Embodiment 2

[0028] Example 2 Purification of oxide-containing copper nanoparticles due to insufficient reducing agent (2)

[0029] In order to prove that this method has wider applicability, select another kind of green material ascorbic acid (also known as vitamin C) to make reducing agent, when 10 milliliters of glucose in the embodiment 1 is replaced with 1.5 mol / liter 20 milliliters of ascorbic acid, and in After stirring and reacting at room temperature for 12 hours, pure copper nanoparticles can be prepared. The obtained copper nanoparticles are also pure and have strong oxidation resistance.

[0030] According to the research method of reducing the amount of reducing agent in Example 1 and measuring the change of the product with the aging time, the concentration of ascorbic acid is halved (the volume remains unchanged), and half of the product is taken out after stirring for 30 minutes, centrifuged and washed, and dried at 70 ° C. , named sample No. 2. The other half was not dir...

Embodiment 3

[0032] The test of embodiment 3 purification sample catalytic activity

[0033] In order to verify that the copper nanoparticles obtained by the purification method of the present invention have the same catalytic activity as the copper nanoparticles directly obtained under sufficient conditions of the reducing agent, the following comparison test has been done: compare the purified copper nanoparticles (the aged 15 days of the embodiment 1) No. 1 sample) and the nano-copper particles (No. 4 sample of embodiment 1) obtained under the normal reducing agent dosage condition in catalytic NaBH 4 Catalytic activity in redox P-nitrophenol experiments.

[0034] The specific operation is as follows: the dried copper nanoparticles are weighed to form a suspension with a concentration of 15 mmol / L. Configure P-Nitrophenol and NaBH 4 The aqueous solution, the concentration of P-nitrophenol solution is 0.1 mol / liter; NaBH 4 NaBH at a concentration of 0.04 mol / L 4 of aqueous solution. ...

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Abstract

The invention discloses a method for purifying copper nanoparticles, and belongs to the technical field of nanometer material synthesizing methods. The precursor of copper is cheap, and nanometer-grade copper particles have high catalytic activity, but the copper nanoparticles tend to be oxidized easily, severely influencing the catalytic performance of copper. Thus, the purification of copper nanoparticles is an important link in the application on the catalytic aspect. A purification solution contains chloride, glucose or ascorbic acid, citrate and soluble carbonate; during purification, copper nanoparticles to be purified are added into the purification solution and are aged for certain days, and purification is performed by using the own disproportionation reaction and the oxidation-reduction reaction of a system to obtain pure copper nanoparticles. The purification solution can be used repeatedly; the reaction residual solution of copper nanoparticles prepared by using a liquid-phase wet chemical reduction method can be skillfully taken as the purification solution. The method has the advantages of low cost, easiness in operation, saving of energy, environmental friendliness and high product purity, and can be widely applied.

Description

technical field [0001] The invention belongs to the technical field of synthesis methods of nanomaterials, in particular to a method for purifying copper nanoparticles, in particular to a method for recycling the remaining reaction solution in the process of synthesizing copper nanoparticles as a purification solution, and utilizing the reaction of the system itself to purify copper nanoparticles particle method. Background technique [0002] In the past ten years, the research on the catalytic properties of nanomaterials has been a hot spot of concern of researchers at home and abroad. Compared with expensive noble metals, copper has gradually become a new star in the field of catalysis because of its cheap precursors and strong catalytic ability. However, copper nanoparticles are easily oxidized during catalysis or storage, and copper oxide layers (including copper oxide and cuprous oxide) are formed on the surface, which seriously hinder the catalytic activity and select...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 隋永明刘欣美刘闯徐满邹勃
Owner JILIN UNIV
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