A preparation method and application of gold-silica janus structure nanoparticles with high catalytic properties

A gold nanoparticle and nanoparticle technology, which is applied in the field of preparation and application of gold-silicon oxide Janus structure nanoparticles with high catalytic properties, can solve the problem of unsuitable industrial catalytic applications and reduce the catalytic activity of gold-silicon oxide Janus structure nanoparticles and other problems, to achieve the effect of excellent reusability, industrial application, and mass production.

Active Publication Date: 2017-07-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention solves the problem that the existing technology for preparing gold-silicon oxide Janus structure nanoparticles will cause the uncoated gold surface of silicon oxide to cover heavy ligand macromolecules, thereby significantly reducing the catalytic activity of gold-silicon oxide Janus structure nanoparticles , is not suitable for industrial catalytic applications, and provides a gold-silicon oxide Janus structure nanoparticle with high catalytic properties and its preparation method and application

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  • A preparation method and application of gold-silica janus structure nanoparticles with high catalytic properties
  • A preparation method and application of gold-silica janus structure nanoparticles with high catalytic properties
  • A preparation method and application of gold-silica janus structure nanoparticles with high catalytic properties

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specific Embodiment approach 1

[0031] Embodiment 1: A gold-silicon oxide Janus structure nanoparticle with high catalytic properties described in this embodiment is irradiated by an ultraviolet lamp to an ethanol aqueous solution of gold-silicon oxide Janus structure nanoparticle, centrifuged and washed with water. get.

[0032] The beneficial effects of this embodiment are: (1) significantly enhance the catalytic properties of gold-silicon oxide Janus structure nanoparticles, which is beneficial to industrial applications; in the reduction reaction of nitrophenol, under the same conditions, the gold-oxidized The complete catalysis time of the silicon Janus structure nanoparticles is 10 minutes, and the half-covered ligands on the gold surface fall off after light irradiation, exposing part of the gold surface, and the complete catalysis time of the Janus structure nanoparticles is increased to 6 minutes. And whether it is illuminated or not, the catalytic rate of Janus' gold-silicon oxide (0.24min before i...

specific Embodiment approach 2

[0034] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the ethanol aqueous solution of gold-silicon oxide Janus structure nanoparticles is specifically prepared according to the following steps: 1. Gold nanoparticles were mixed with water to obtain a concentration of 10 -4 mmol / L~10 -3 mmol / L gold nanoparticle aqueous solution, drop the gold nanoparticle aqueous solution into the alcohol solvent to obtain a reaction system, and then mix the A solution with a concentration of 1mmol / L~10mmol / L under the stirring condition of 50rpm~400rpm Add the B solution with a concentration of 0.2mmol / L to 5mmol / L dropwise into the reaction system. After the dropwise addition, stir the reaction system at a speed of 50rpm to 400rpm for 1min to 10min, and then stir the reaction system at a speed of 50rpm to 400rpm. , stirring for 10min to 60min to obtain a reaction system containing gold nanoparticles coated with double ligands; the gold nano...

specific Embodiment approach 3

[0037] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the ultraviolet lamp is obtained after the ethanol aqueous solution of gold-silicon oxide Janus structure nanoparticles is irradiated, specifically according to the following steps: At a rotational speed of 50rpm-400rpm, use a UV lamp with a power of 0.1W-1000W to irradiate the ethanol aqueous solution of gold-silicon oxide Janus structure nanoparticles for 1min-1000min. Under the condition of ultrasonic power of 100W-500W, The irradiated gold-silicon oxide Janus structure nanoparticle ethanol aqueous solution is ultrasonically treated for 1min to 100min, then centrifuged and washed with water for 3 to 6 times, and finally dispersed into water for later use to obtain gold-silicon oxide with high catalytic properties Janus structured nanoparticles;

[0038] The ultraviolet lamp is one or a combination of single wavelength and continuous wavelength of ultraviolet light...

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Abstract

The invention discloses a gold-silicon oxide Janus structure nano particle with high catalytic characteristic and a preparation method and application thereof, relates to the gold-silicon oxide Janus structure nano particle and the preparation method and application thereof, and aims to solve the problems that in the prior art, the gold surface not coated with silicon oxide is covered with heavy ligand macromolecules, so that the catalytic activity of the gold-silicon oxide Janus structure nano particle is remarkably decreased, and the gold-silicon oxide Janus structure nano particle is not suitable for industrial catalytic application. The gold-silicon oxide Janus structure nano particle with high catalytic characteristic is obtained through irradiating gold-silicon oxide Janus structure nano particle ethanol water with an ultraviolet lamp, carrying out centrifugal separation, and washing with water. The method comprises the following steps: I, preparing a reaction system comprising gold nano particles coated with dual ligands; II, preparing an aqueous solution of the gold-silicon oxide Janus structure nano particle; III, irradiating with the ultraviolet lamp. The application lies in that the gold-silicon oxide Janus structure nano particle is applied to organic reactions for reducing nitrophenol to aminophenol.

Description

technical field [0001] The invention relates to a gold-silicon oxide Janus structure nano particle, a preparation method and an application thereof. Background technique [0002] Since Gennes first highlighted Janus-structured particles in his Nobel Prize Lecture, such structures have received extensive attention in materials science. Generally speaking, Janus-structured particles refer to the combination of two different functionalized surfaces or two components with different physicochemical properties in the same particle structure. The Janus structure integrates multiple functions in one body, so it has good application prospects in the fields of optics, catalysis, sensing and biomarkers. Gold-silicon oxide Janus structure nanoparticles are one of the types that have received more attention. Partially coated silicon oxide can effectively prevent the aggregation and poisoning of gold nanoparticles. However, the existing methods for preparing gold-silicon oxide Janus stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J31/22C07C215/76C07C213/02
Inventor 于淼孙磊孙晔李宁宁王浩宇王少山向松涛
Owner HARBIN INST OF TECH
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