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Preparation method of nanogold-loaded magnetic nanometer catalyst

A technology of magnetic nanometers and magnetic nanoparticles, which is applied in the field of preparation of magnetic nanocatalysts, can solve problems such as complex preparation methods, achieve high catalytic activity, ensure catalytic efficiency, and achieve high catalytic efficiency

Inactive Publication Date: 2018-06-29
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent (application number: 201110344754.5 application date: 2011-11-04) discloses a multi-level core-shell structure magnetic nano-gold catalyst and its preparation method, but its preparation method is relatively complicated

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  • Preparation method of nanogold-loaded magnetic nanometer catalyst
  • Preparation method of nanogold-loaded magnetic nanometer catalyst
  • Preparation method of nanogold-loaded magnetic nanometer catalyst

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Experimental program
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Effect test

Embodiment 1

[0033] The preparation method of the magnetic nano-catalyst of loaded nano-gold of the present invention is specifically as follows:

[0034] (1) Preparation of magnetic nanoparticles Fe by hydrothermal method 3 o 4 , and then coated with a silicon dioxide layer. It should be noted that since the hydrothermal method prepares magnetic nanoparticles Fe 3 o 4 , for magnetic nanoparticles Fe 3 o 4 Coating with a silicon dioxide layer already belongs to the prior art and will not be described too much here.

[0035] (2) Modification of silicon-coated magnetic nanoparticles with mercaptosilane coupling agent: uniformly disperse silicon-coated magnetic nanoparticles in ethanol solution to obtain a silicon-coated magnetic nanoparticle ethanol dispersion with a concentration of 0.2 mg / mL, and then add the volume fraction 1% ammonia water and stirred for 15 min under mechanical stirring conditions, then 0.5 mL of 3-mercaptopropyltrimethoxysilane solution with a volume fraction of ...

Embodiment 2

[0038] The preparation method of the magnetic nano-catalyst of loaded nano-gold of the present invention is specifically as follows:

[0039] (1) Preparation of magnetic nanoparticles Fe by hydrothermal method 3 o 4 , and then coated with a silicon dioxide layer.

[0040] (2) Modification of silicon-coated magnetic nanoparticles with mercaptosilane coupling agent: uniformly disperse silicon-coated magnetic nanoparticles in ethanol solution to obtain a silicon-coated magnetic nanoparticle ethanol dispersion with a concentration of 2.5 mg / mL, and then add volume fraction 2.5 mL of 3-mercaptopropyltrimethoxysilane solution with a volume fraction of 2.5% was added dropwise, stirred at room temperature for 24 h, and the reaction product was collected magnetically and alternated with water and alcohol. After washing twice, it was dispersed in deionized water to obtain a dispersion of magnetic nanoparticles with surface-modified mercapto groups at a concentration of 2.5 mg / mL.

[...

Embodiment 3

[0046] The preparation method of the magnetic nano-catalyst of loaded nano-gold of the present invention is specifically as follows:

[0047] (1) Preparation of magnetic nanoparticles Fe by hydrothermal method 3 o 4 , and then coated with a silicon dioxide layer.

[0048] (2) Modification of silicon-coated magnetic nanoparticles with mercaptosilane coupling agent: uniformly disperse silicon-coated magnetic nanoparticles in ethanol solution to obtain a silicon-coated magnetic nanoparticle ethanol dispersion with a concentration of 5.0 mg / mL, and then add the volume fraction 10% ammonia water and stirred for 15 min under mechanical stirring conditions, then 5.0 mL of 3-mercaptopropyltrimethoxysilane solution with a volume fraction of 5% was added dropwise, stirred at room temperature for 24 h, the reaction product was collected magnetically and alternated with water and alcohol After washing twice, it was dispersed in deionized water to obtain a dispersion of magnetic nanopart...

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Abstract

The invention discloses a preparation method of a nanogold-loaded magnetic nanometer catalyst. The preparation method comprises the following steps of adopting a hydrothermal method for synthesizing to obtain a magnetic nanoparticle Fe3O4, and coating the magnetic nanoparticlewith silicon dioxide; modifying the silicon-coated magnetic nanoparticle through a sulfydrylsilane coupling agent: fully dispersing the silicon-coated magnetic nanoparticle into an ethanol solution, adding ammonium hydroxide and stirring, then dropwise adding a silane coupling agent solution with sulfydryl, stirring at the room temperature, magnetically separating a production, and washing; loading nanogold onto the sulfhydrylationmagnetic nanoparticle: after dispersing the sulfhydrylationmagnetic nanoparticle into deionized water, adding a nanogold solution, stirring at the room temperature, magnetically separating a production, and washing to obtain the nanogold-loaded magnetic nanometer catalyst. The preparation method provided by the invention is simple and practicable; experiment conditions are mild and easy to meet; the prepared nanogold-loaded magnetic nanometer catalyst can efficiently and quickly catalyze the reduction reaction of p-nitrophenol, and can be reutilized for not less than 8 times.

Description

technical field [0001] The invention relates to the field of magnetic nanomaterials and catalytic applications, in particular to a preparation method of a magnetic nanocatalyst loaded with nanogold. Background technique [0002] Metal gold has no catalytic activity at the macroscopic level, but gold has excellent catalytic activity at the nanoscale. In 1989, Haruta et al found that the loading on Fe 2 o 3 and TiO 2 Gold nanoparticles on such oxides have high catalytic activity for low-temperature CO oxidation. Gold nanoparticles (AuNPs) have a large specific surface area, and as a catalyst, they have a humidity enhancement effect that other noble metals do not have. They have great application prospects in environmental pollution, fuel cells, electrochemical biosensors, etc., opening up gold as a catalyst. New Field. Since then, research on nano-gold catalysts has developed rapidly, and nano-gold catalysts have also been widely used. However, due to the high surface en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/28
CPCB01J31/0275B01J31/28B01J35/393B01J35/33
Inventor 吴江渝汪苏平陈玉婷曾小平王大威张勇
Owner WUHAN INSTITUTE OF TECHNOLOGY
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