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Magnetic core-shell-structured nano-material, preparation method therefor and application of magnetic core-shell-structured nano-material

A technology of core-shell structure and nanomaterials, which is applied in the field of nanomaterials, can solve the problems of no application reports of core-shell structure nanomaterials, sample loss, solvent consumption, etc., achieve stable product shape, reduce reagent consumption, and easily consume Effect

Inactive Publication Date: 2016-04-27
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been studies using dopamine on SiO 2 Surface modification of nanospheres to prepare nanomaterials with core-shell structure, but there is no chelate of nickel salt and dopamine and SiO 2 There is no report on the preparation of core-shell structure nanomaterials by combining nanospheres, and there is no report on the application of core-shell structure nanomaterials
[0004] In addition, in the past, SiO 2 Nanospheres are used as templates, coated with dopamine or chelates of transition metal salts and dopamine to prepare core-shell structure nanomaterials, all of which are two-step synthesis, and SiO is synthesized first. 2 Nanospheres, and then need to prepare the precursor SiO 2 The nanospheres were separated by centrifugation and washed several times with solvents. After the treatment, the SiO 2 The coating of dopamine or the chelate of dopamine and transition metal salts on the nanospheres, the final product needs to be centrifuged and washed with solvent again, because each separation requires a long time and washing with solvent, so that Causes waste of time and solvent consumption, and multiple washes also cause sample loss

Method used

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  • Magnetic core-shell-structured nano-material, preparation method therefor and application of magnetic core-shell-structured nano-material
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  • Magnetic core-shell-structured nano-material, preparation method therefor and application of magnetic core-shell-structured nano-material

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Experimental program
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Effect test

Embodiment 1

[0040] a) Add 30mL of absolute ethanol, 3mL of water (the ratio of alcohol to water is 10:1) and 1mL of ammonia water with a concentration of 32wt% into a clean beaker, stir to make it evenly mixed, and then add 1.2mLTEOS ( orthosilicate), stirred at room temperature for 6 hours, then added dropwise a mixed solution of dopamine and nickel chloride hexahydrate (2:4 in molar ratio) (wherein dopamine 250mg, nickel chloride hexahydrate 775mg), at room temperature Stirring was continued for 7 hours, and then centrifuged (6000rpm, 3min), the collected solid was washed with water and ethanol for 3 times, and then dried to obtain Ni 2+ -PDASiO 2 Core-shell nanomaterials;

[0041] b) Ni to be prepared 2+ -PDASiO 2 Under the protection of nitrogen, the core-shell structure nanomaterials were heated to 500°C at a heating rate of 10°C / min and kept at this temperature for 5 hours to obtain magnetic core-shell structure nanomaterials loaded with nickel particles.

[0042] The correspond...

Embodiment 2

[0045] a) Add 30mL of absolute ethanol, 5mL of water (the ratio of alcohol to water is 6:1) and 1mL of ammonia water with a concentration of 32wt% into a clean beaker, stir to make it evenly mixed, and then add 1.2mLTEOS dropwise under stirring ( Ethyl orthosilicate), stirred at room temperature for 4 hours, then added dropwise a mixed solution of dopamine and nickel chloride hexahydrate (2:4 in molar ratio) (wherein 250 mg of dopamine, 775 mg of nickel chloride hexahydrate), at room temperature Stirring was continued for 24 hours, and then centrifuged (6000rpm, 3min), the collected solid was washed with water and ethanol for 3 times, and then dried to obtain Ni 2+ -PDASiO 2 Core-shell nanomaterials;

[0046] b) Ni to be prepared 2+ -PDASiO 2 Under the protection of nitrogen, the core-shell structure nanomaterials were heated to 500°C at a heating rate of 10°C / min and kept at this temperature for 5 hours to obtain magnetic core-shell structure nanomaterials loaded with nick...

Embodiment 3

[0050] a) Add 25mL of absolute ethanol, 15mL of water (the ratio of alcohol to water is 25:15) and 3.75mL of ammonia water with a concentration of 32wt% into a clean beaker, stir to mix evenly, and then add 3.4mLTEOS dropwise under stirring (orthosilicate), stirred at room temperature for 8 hours, then added dropwise a mixed solution of dopamine and nickel chloride hexahydrate (the molar ratio was 2:6) (250 mg of dopamine, 1164 mg of nickel chloride hexahydrate), in Stirring was continued for 7 hours at room temperature, and then centrifuged (6000rpm, 3min), the collected solid was washed with water and ethanol for 3 times, and then dried to obtain Ni 2+ -PDASiO 2 Core-shell nanomaterials;

[0051] b) Ni to be prepared 2+ -PDASiO 2 Under the protection of nitrogen, the core-shell structure nanomaterials were heated to 500°C at a heating rate of 10°C / min and kept at this temperature for 5 hours to obtain magnetic core-shell structure nanomaterials loaded with nickel particle...

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Abstract

The invention discloses a magnetic core-shell-structured nano-material, a preparation method therefor and application of the magnetic core-shell-structured nano-material. The magnetic core-shell-structured nano-material is prepared through coating silicon dioxide nanospheres by a chelate of dopamine and a nickel salt so as to obtain a Ni<2+>-PDA@SiO2 core-shell-structured nano-material, subjecting the Ni<2+>-PDA@SiO2 core-shell-structured nano-material to roasting or etching and then carrying out roasting. Shown by experiments, the magnetic core-shell-structured nano-material disclosed by the invention has the advantages of large specific surface area, good morphology, relatively high magnetic property, excellent adsorption and catalysis performance and the like, can serve as a protein adsorbent and a reduction reaction catalyst of aromatic nitro compounds and has relatively good use values and application prospects in the fields of environment, energy sources and the like.

Description

technical field [0001] The invention relates to a magnetic core-shell structure nano material and its preparation method and application, belonging to the technical field of nano materials. Background technique [0002] With the development of nanotechnology, core-shell nanocomposites have become a research hotspot in the fields of composite materials and nanomaterials. Core-shell nanocomposites (CSNC) are generally composed of a central core and an outer shell. The core and shell in CSNC are connected to each other through physical and chemical interactions. The core-shell structure in a broad sense includes not only nanocomposites with a core-shell structure composed of different substances, but also nanocomposites such as hollow microspheres and microcapsules. Since CSNCs have many unique physical and chemical properties, they have potential applications in superhydrophobic surface coatings, materials science, chemistry, magnetism, electricity, optics, biomedicine, catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J23/755B01J35/02C07C213/02C07C215/76B01J35/00
CPCB01J20/223C07C213/02B01J20/28009B01J20/28014B01J21/08B01J23/755B01J35/396C07C215/76
Inventor 丁磊张敏徐菁利
Owner SHANGHAI UNIV OF ENG SCI
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