Preparation method for synthesizing Fe3O4(PAA)@C-Au core-shell-structured microspheres with one-step hydrothermal method

A core-shell structure, hydrothermal technology, applied in catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve the problems of easy loss, easy agglomeration, etc. Easy to churn, short process, the effect of promoting the probability of collision

Inactive Publication Date: 2016-10-26
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Therefore, it is still an important task in this field to choose a noble metal nanocatalyst carrier with high-efficiency loading capacity, stably immobilize noble metal nanop

Method used

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  • Preparation method for synthesizing Fe3O4(PAA)@C-Au core-shell-structured microspheres with one-step hydrothermal method
  • Preparation method for synthesizing Fe3O4(PAA)@C-Au core-shell-structured microspheres with one-step hydrothermal method
  • Preparation method for synthesizing Fe3O4(PAA)@C-Au core-shell-structured microspheres with one-step hydrothermal method

Examples

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Embodiment example 1

[0019] Under the condition of 60°C oil bath, disperse ferric chloride and polyacrylic acid in ethylene glycol, then add anhydrous sodium acetate and stir vigorously for 2 hours, after mixing evenly, transfer the obtained khaki precursor solution to an airtight container In the process, the temperature was controlled at 200° C. for 8 hours, and magnetic separation, alcohol washing, water washing, and drying were performed to obtain magnetic ferric oxide microspheres with a diameter of 260 nm. Among them, the mass ratio of ferric chloride, polyacrylic acid, ethylene glycol, and anhydrous sodium acetate is: 1:0.02:42:8;

[0020] Mix magnetic iron ferric oxide microspheres, glucose, deionized water, and chloroauric acid in a certain proportion by ultrasound, then transfer to a closed container, and control the temperature at 180°C for 6 hours to obtain a core-shell structure Fe 3 o 4 (PAA)@C-Au microspheres. Among them, the mass ratio of magnetic iron ferric oxide microspheres, ...

Embodiment example 2

[0022] Under the condition of 60°C oil bath, disperse ferric chloride and polyacrylic acid in ethylene glycol, then add anhydrous sodium acetate and stir vigorously for 2 hours, after mixing evenly, transfer the obtained khaki precursor solution to an airtight container In the process, the temperature was controlled at 200° C. for 8 hours, and magnetic separation, alcohol washing, water washing, and drying were performed to obtain magnetic ferric oxide microspheres with a diameter of 260 nm. Among them, the mass ratio of ferric chloride, polyacrylic acid, ethylene glycol, and anhydrous sodium acetate is: 1:0.02:42:8;

[0023] Mix magnetic iron ferric oxide microspheres, glucose, deionized water, chloroauric acid, and CTAB in a certain proportion, and then transfer them to an airtight container, and control the temperature at 180°C for 6 hours to obtain a core-shell structure Fe 3 o 4 (PAA)@C-Au microspheres. Among them, the mass ratio of magnetic iron ferric oxide microspher...

Embodiment example 3

[0025] Under the condition of 60°C oil bath, disperse ferric chloride and polyacrylic acid in ethylene glycol, then add anhydrous sodium acetate and stir vigorously for 2 hours, after mixing evenly, transfer the obtained khaki precursor solution to an airtight container In the process, the temperature was controlled at 200° C. for 8 hours, and magnetic separation, alcohol washing, water washing, and drying were performed to obtain magnetic ferric oxide microspheres with a diameter of 260 nm. Among them, the mass ratio of ferric chloride, polyacrylic acid, ethylene glycol, and anhydrous sodium acetate is: 1:0.02:42:8;

[0026] Mix iron ferric oxide microspheres, glucose, deionized water, chloroauric acid, and sodium citrate in a certain proportion by ultrasound, then transfer the magnetism to a closed container, and control the temperature at 180°C for 6 hours to obtain a core-shell structure Fe 3 o 4 (PAA)@C-Au microspheres. Among them, the mass ratio of magnetic iron ferri...

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Abstract

The invention provides a preparation method for synthesizing Fe3O4(PAA)@C-Au core-shell-structured microspheres with a one-step hydrothermal method, and belongs to the field of nano-composites. The preparation method comprises the following steps: (1) preparing monodisperse PAA (polyacrylic acid) modified Fe3O4 magnetic microspheres with uniform particle size; (2) supporting a porous carbon layer and precious metal nanoparticles with high catalytic activity on the surfaces of the magnetic microspheres with the one-step hydrothermal method, and a supported precious metal nano-composite catalytic material is obtained. According to the method, the precious metal nano-catalytic material with high catalytic activity is supported on the surfaces of the magnetic microspheres with one step, the porous carbon layer provides a channel for conveying substrate molecules and transporting products, and promotes the collision probability of a catalytic activity center and the substrate molecules; by means of stable immobilization of the precious metal nanoparticles, the problems of proneness to running away, proneness to agglomeration and the like of the precious metal nano-catalyst in a using process are solved effectively; the nano-composite catalytic material prepared with the method has high catalytic efficiency and strong cycling stability. The method adopts a simple reaction process, and is short in process, pollution-free, little in energy consumption and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, in particular to a one-step hydrothermal synthesis of Fe 3 o 4 Preparation method of (PAA)@C-Au core-shell microspheres. Background technique [0002] Noble metal nanoparticles such as gold (Au), silver (Ag), platinum (Pt), palladium (Pd), etc. have been widely used in C-C due to their high specific surface area, atomic size effect, plasmon resonance effect, and excellent substrate adsorption capacity. Bond and C-H bond coupling reaction, hydrogenation reaction, redox reaction and other catalytic reactions. However, noble metal nanoparticles are easy to agglomerate and difficult to recycle after the reaction, which greatly limits its development. The use of noble metal nanocatalyst supports such as molecular sieves, polymers, activated carbon, and metal oxides to immobilize noble metal nanoparticles is conducive to the efficient and stable immobilization of noble metal nanoparticles. Th...

Claims

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Application Information

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IPC IPC(8): B01J31/28
CPCB01J31/28B01J35/0033B01J35/0073B01J35/08B01J37/10
Inventor 王戈李洁杨穆高鸿毅谭丽
Owner UNIV OF SCI & TECH BEIJING
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