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A kind of water-soluble amorphous noble metal nanoparticles and preparation method thereof

A nanoparticle and precious metal technology, applied in the field of water-soluble amorphous precious metal nanoparticles and their preparation, can solve the problems of precipitation, wide particle size distribution, poor controllability, etc., and achieve uniform particle size, good stability, and easy industrialization. Effect

Active Publication Date: 2022-06-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some modification groups are difficult to remove, which limits the practical application, and the controllability is poor, the prepared particle size distribution is wide, and it is easy to precipitate out in water
In the prior art, there are few reports on the one-step metal reduction and surface hydrophilic modification process in the preparation of water-soluble amorphous noble metal nanoparticles. Highly dispersed amorphous noble metal nanoparticles in aqueous solvents, laying the foundation for broadening the application of metal nanoparticles

Method used

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  • A kind of water-soluble amorphous noble metal nanoparticles and preparation method thereof
  • A kind of water-soluble amorphous noble metal nanoparticles and preparation method thereof
  • A kind of water-soluble amorphous noble metal nanoparticles and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing a water-soluble amorphous noble metal nanoparticle dispersion, comprising the following steps:

[0040] (1) Weigh 400mg of sodium hypophosphite in proportion and dissolve it in 7mL of deionized water; add 1ml of prepared chloroplatinic acid solution (10mg / ml), stir well; continue to add 2ml of sodium hydroxide solution (8mg / ml), Stir at room temperature for 30 minutes to obtain a light yellow clear liquid; put the mixed liquid into a reaction kettle, and set the hydrothermal conditions as follows: 180°C for 12 hours.

[0041] (2) Cool to normal temperature, take out the hydrothermal product, and then perform centrifugation at a speed of 8000r.p.m for 5 minutes; the precipitated precious metal nanoparticles are obtained, and the precipitated precious metal nanoparticles are redispersed into water to obtain a certain concentration dispersion of noble metal nanoparticles.

Embodiment 2

[0043] A preparation method of water-soluble amorphous noble metal nanoparticles, comprising the following steps:

[0044] (1) Weigh 400mg of sodium hypophosphite in proportion and dissolve it in 7mL of deionized water; add 1ml of prepared iridium chloride solution (10mg / ml) and stir well; continue to add 1.7ml of sodium hydroxide solution (8mg / ml) , stirred at room temperature for 30 minutes; the mixed solution was put into a reaction kettle, and the hydrothermal condition was set as: 180° C., 12 hours.

[0045] (2) Cool to room temperature, take out the hydrothermal product, and then perform centrifugation at a speed of 10000r.p.m for 7 minutes; the precipitated precious metal nanoparticles are obtained, and the precipitated precious metal nanoparticles are redispersed into water to obtain a certain concentration dispersion of noble metal nanoparticles.

Embodiment 3

[0047] A preparation method of water-soluble amorphous noble metal nanoparticles, which differs from the foregoing embodiments in that two metal precursors are introduced, comprising the following steps:

[0048] (1) Weigh 400mg sodium hypophosphite in proportion and dissolve it in 7mL deionized water; add 0.5ml chloroplatinic acid solution (10mg / ml) and 0.5ml iridium chloride solution (10mg / ml), stir well; continue to add 2ml Sodium hydroxide solution (8 mg / ml), stirred at room temperature for 30 minutes, put into the reaction kettle, and the hydrothermal conditions were set as: 180°C, 12 hours;

[0049] (2) Cool to room temperature, take out the hydrothermal product, and then perform centrifugation at a speed of 10,000 r.p.m for 6 minutes; the precipitated precious metal nanoparticles are obtained, and the precipitated precious metal nanoparticles are redispersed into water to obtain a certain concentration dispersion of noble metal nanoparticles. .

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Abstract

The invention discloses a water-soluble amorphous noble metal nano particle and a preparation method thereof, and relates to the technical field of noble metal nano materials. The method comprises the following steps: uniformly dispersing the precious metal source and the reducing agent in the water solvent, adjusting the pH value of the reaction solution to 2-8, and then hydrothermally reacting at 120-200°C for 10-20 hours to obtain the water-soluble amorphous precious metal Nanoparticles. The method for preparing noble metal nanoparticles provided by the invention is simple and controllable, can be prepared in large quantities, and is easy for industrialization.

Description

technical field [0001] The invention relates to the technical field of noble metal nanomaterials, in particular to a water-soluble amorphous noble metal nanoparticle and a preparation method thereof. Background technique [0002] Water solubility can improve the application range of metal nanoparticles, making them more widely used in catalysis, biology, medical treatment, fine chemical industry, etc. Especially in the field of catalysis, the use of amorphous metal nanoparticle materials as catalysts can improve catalytic activity and selectivity. Compared with crystals, the application of amorphous metal particles is more flexible. The atoms in the amorphous phase are arranged randomly and have more randomly oriented unsaturated bonds, which is conducive to the adsorption of reactants. At the same time, there are a large number of local structures that can be changed flexibly in the amorphous phase, which can accelerate the charge transfer between active sites and intermed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/0545C25B1/04C25B11/065C25B11/081B82Y40/00B82Y30/00
CPCB22F9/24C25B1/04B82Y40/00B82Y30/00B22F1/0545B22F1/054Y02E60/36
Inventor 杨勇鲍晓冰秦依钒赵泽军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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