A kind of noble metal quantum dots and preparation method and application thereof

A technology of gold quantum dots and quantum dots, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the limitations of large-scale preparation of small-sized nanoparticles, To solve the problems of poor practicability, environmental pollution, etc., and achieve the effect of excellent catalytic performance

Active Publication Date: 2022-07-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the practicability of these methods is not strong, generally expensive noble metal precursors and phase transfer agents are required, the toxic organic solvents used in them may cause pollution to the environment, and separation is difficult, especially when the particle size of nanoparticles is between 1nm and 2nm It is difficult to separate, and it takes a long time to centrifuge at high speed in a centrifuge, which greatly limits the large-scale preparation of small-sized nanoparticles

Method used

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  • A kind of noble metal quantum dots and preparation method and application thereof
  • A kind of noble metal quantum dots and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The lithium vanadate LiV 3 O 8 The nano-powder is soaked in 0.001mol / L chloroauric acid solution, soaked for 1 h to perform ion exchange, and then undergoes solid-liquid separation, washing and drying at 50°C in sequence to obtain gold vanadate;

[0053] The obtained gold vanadate was calcined at a calcination temperature of 800 °C, a calcination time of 72 h, and a heating rate of 10 °C / min to obtain gold quantum dots embedded in V. 2 O 5 mixed powder;

[0054] The obtained mixed powder was washed with 1mol / L oxalic acid for 72h to remove V 2 O 5 , to obtain gold quantum dots, the size of which is less than 20 nm.

Embodiment 2

[0056] Lithium vanadate 0.01 V 3 O 8 The nano-powder is immersed in 1mol / L gold acetylacetonate solution, soaked for 72 hours for ion exchange, and then undergoes solid-liquid separation, washing and drying at 80°C in sequence to obtain gold vanadate;

[0057] The obtained gold vanadate was calcined at a calcination temperature of 200 °C, a calcination time of 1 h, and a heating rate of 0.5 °C / min to obtain gold quantum dots embedded in V. 2 O 5 mixed powder;

[0058] The obtained mixed powder was washed with 1 mol / L formic acid for 1 h to remove V 2 O 5 , to obtain gold quantum dots, the size of which is less than 20 nm.

Embodiment 3

[0060] Lithium vanadate 2 V 3 O 8 The nano-powder was soaked in 1 mol / L silver nitrate solution, soaked for 36 hours for ion exchange, and then successively underwent solid-liquid separation, washing and drying at 60 °C to obtain silver vanadate;

[0061] The obtained silver vanadate was calcined at a calcination temperature of 500 °C, a calcination time of 5 h, and a heating rate of 5 °C / min to obtain silver quantum dots embedded in V. 2 O 5 mixed powder;

[0062] The obtained mixed powder was washed with 1 mol / L acetic acid for 1 h to remove V 2 O 5 , the quantum dots of silver are obtained, and the size of the quantum dots is equal to 20 nm.

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Abstract

The invention belongs to the technical field of quantum dot materials, and in particular relates to a precious metal quantum dot and a preparation method and application thereof. The method comprises the steps of: 1) soaking the vanadate powder of the layered alkali metal cation or transition metal cation into an aqueous solution of a soluble precious metal salt, soaking to perform ion exchange, and then performing solid-liquid separation, washing and drying in sequence, Obtaining the vanadate of the precious metal; 2) calcining the vanadate of the precious metal obtained in step 1) to obtain a mixed powder in which the precious metal quantum dots are dispersed in the vanadium oxide residue; 3) calcining the mixed powder obtained in the step 2) Pickling is carried out to remove vanadium oxide residues to obtain noble metal quantum dots.

Description

technical field [0001] The invention belongs to the technical field of quantum dot materials, and in particular relates to a precious metal quantum dot and a preparation method and application thereof. Background technique [0002] Quantum dots are low-dimensional semiconductor materials whose dimensions in three dimensions are no larger than twice the exciton Bohr radius of their corresponding semiconductor materials. Quantum dots are generally spherical or quasi-spherical, and their diameter is often between 1-20 nm, which can also be regarded as nanomaterials in essence. Due to their good catalytic, optical and other physical and chemical properties, noble metal nanomaterials have received extensive attention from many researchers in industry and scientific research in recent years, and have been widely used in fuel cells, chemical catalysis and other fields. [0003] So far, scientists have explored a variety of preparation methods for monodisperse noble metal nanoparti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J23/50B01J23/42B01J23/46B01J23/44C09K11/58C09K11/87B82Y20/00B82Y40/00B22F9/30C22C1/00
CPCB01J23/52B01J23/50B01J23/42B01J23/462B01J23/464B01J23/44B01J23/466B01J23/468B01J35/0033B01J35/0013B01J35/006C09K11/58C09K11/87B82Y20/00B82Y40/00B22F9/30C22C1/00
Inventor 方东张腾鲍瑞易健宏谢明陶静梅李凤仙游昕谈松林刘意春李才巨
Owner KUNMING UNIV OF SCI & TECH
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