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Magnetic core-shell nanometer composite material with nickel particles and preparation method and application of magnetic core-shell nanometer composite material

A nano-composite material and nickel-loaded technology, applied in the field of nano-materials, can solve the problems of restricting the popularization and application of materials, high prices, and limited precious metal resources, and achieve good use value and application prospects, good morphology and structure, adsorption and catalytic functions excellent effect

Inactive Publication Date: 2017-11-10
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, core-shell nanocomposites have core-shell structures such as metal-metal, metal-oxide, and oxide-oxide. Among them, the metals in the composite materials are mostly noble metals such as Ag, Au, Pd, and Pt. However, noble metals Resources are limited and expensive, which restricts the popularization and application of this kind of materials to a certain extent

Method used

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  • Magnetic core-shell nanometer composite material with nickel particles and preparation method and application of magnetic core-shell nanometer composite material
  • Magnetic core-shell nanometer composite material with nickel particles and preparation method and application of magnetic core-shell nanometer composite material
  • Magnetic core-shell nanometer composite material with nickel particles and preparation method and application of magnetic core-shell nanometer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Fe 3 o 4 @SiO 2 Preparation of @C-Ni Nanomaterials

[0048] a) Fe 3 o 4 Preparation of microspheres: Using solvent hydrothermal method, disperse 3g of nickel chloride hexahydrate and 0.83g of trisodium citrate in 70mL of ethylene glycol, then add 4.8g of sodium acetate, stir in a beaker to form a uniform solution, and then The above homogeneous solution was transferred into a 50mL reactor, and hydrothermally reacted at 200°C for 10 hours. After the reaction was completed, it was cooled to room temperature, and the reactor was taken out, and the reaction solution in the reactor was poured into a beaker, separated under the action of a magnet and washed with water washed several times with ethanol and dried to obtain Fe 3 o 4 Nanospheres, Fe 3 o 4 Microsphere particle size range 110~180nm, Fe 3 o 4 The average particle size of the microspheres is about 150nm.

[0049] b) Core-shell structure nanomaterial Fe 3 o 4 @SiO 2 Preparation: 100mg Fe 3 o 4 The micr...

Embodiment 2

[0057] Effects of Different Thicknesses of Silica Layer on the Size and Density of Nickel Particles

[0058] The difference between the experimental conditions of this example and Example 1 is that the amount of TEOS (orthoethyl silicate) was changed, and the amount of TEOS was adjusted to 93 mg and 0.46 g respectively, to obtain magnetic silicon balls Fe coated with silicon dioxide layers of different thicknesses. 3 o 4 @SiO 2 , and then prepare the core double-shell material Fe loaded with nickel particles of different particle sizes and densities 3 o 4 @SiO 2 @C-Ni. Wherein, when the amount of TEOS is 93mg, 0.28g and 0.46g, the corresponding silicon dioxide layer thicknesses are 7nm, 25nm and 30nm respectively.

[0059] Magnetic silicon sphere Fe coated with silicon dioxide layer of different thickness 3 o 4 @SiO 2 Magnetic core-shell-shell structure nanomaterial Fe prepared as a matrix 3 o 4 @SiO 2 The SEM and TEM images of @C-Ni are as follows figure 2 shown....

Embodiment 3

[0064] Fe 3 o 4 Preparation of @C-Ni Nanomaterials

[0065] The difference between this embodiment and embodiment 1 is that directly using Fe 3 o 4 Preparation of core-shell nanomaterial Fe with microspheres as matrix 3 o 4 @RF-Ni 2+ , among them, the amount of resorcinol and nickel nitrate hexahydrate set three investigation groups, respectively, 20mg resorcinol amount and 80mg nickel salt amount; 31mg resorcinol amount and 124mg nickel salt amount; 62mg between The amount of hydroquinone and the amount of 248mg nickel salt; the amount of Fe used in the three investigation groups 3 o 4 The amount of microspheres was all 310 mg.

[0066] Fe coated with nickel salt-doped phenolic resin with different thickness 3 o 4 @RF-Ni 2+ SEM and TEM images of magnetic core-shell nanomaterials image 3 shown. image 3 a, b core-shell nanomaterial Fe 3 o 4 @RF-Ni 2+ The shell thickness is about 7nm; image 3 c, d core-shell nanomaterial Fe 3 o 4 @RF-Ni 2+ The shell thickn...

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Abstract

The invention relates to a magnetic core-shell nanometer composite material with nickel particles and a preparation method and application of the magnetic core-shell nanometer composite material. The composite material comprises magnetic cores and carbonized shells, wherein the magnetic cores are coated with the carbonized shells with the nickel particles. The portion between each magnetic core and the corresponding carbonized shell is coated with a silica inner shell. The preparation method of the composite material comprises the following steps that firstly, the magnetic cores coated with silica layers are dispersed in an alkaline alcohol-water system, then added into a precursor solution of synthetic phenolic resin mixed with nickel salt, and the magnetic cores coated with phenolic resin layers are obtained after reaction, wherein the phenolic resin layers are doped with nickel ions; secondly, the magnetic cores coated with the phenolic resin layers are subjected to heat preservation and calcination in an inert environment, and the magnetic core-shell nanometer composite material with the nickel particles is obtained. The composite material has the advantages of being high in magnetism, good and stable in morphology and structure, good in adsorption and catalytic functions and the like, and the composite material is especially used in a catalytic reduction reaction of an aromatic nitro compound.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a magnetic core-shell nanocomposite material loaded with nickel particles, a preparation method and application thereof. Background technique [0002] Nanotechnology is the product of the combination of modern technology (such as computer technology, microelectronics and scanning tunneling microscope technology) and modern science (molecular biology, quantum mechanics, etc.). The resulting nanomaterials have many advantages such as high hardness, light weight, convenient design, long life, and low maintenance costs, and their performance is more outstanding than ordinary materials. Among them, the nanocomposite material with core-shell structure is generally composed of a central core and a shell covering the outside, and the core and shell in the nanocomposite material with core-shell structure are connected to each other through physical and chemical interactions. The core-shell s...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J27/22C07C213/02C07C215/76C07K14/765C07K1/14
CPCB01J20/02B01J20/06B01J20/103B01J20/20C07C213/02C07K14/765B01J20/28009B01J27/22B01J2220/4812B01J2220/42B01J2220/4806B01J35/396B01J35/393B01J35/33C07C215/76
Inventor 丁磊张敏徐菁利
Owner SHANGHAI UNIV OF ENG SCI
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