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A preparation method of broken carbon capsules with magnetic nanoparticles embedded in the shell

A technology of magnetic nanoparticles and shell layers, applied in the field of preparation of broken carbon capsules, can solve the problems of unbroken capsules and low crushing efficiency, and achieve the effects of good recycling efficiency, not easy to fall off, and fast adsorption rate

Active Publication Date: 2019-11-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the existing method for preparing broken capsules has low crushing efficiency, and unbroken intact capsules are often found, and provides a method for preparing broken carbon capsules whose shells are embedded with magnetic nanoparticles

Method used

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  • A preparation method of broken carbon capsules with magnetic nanoparticles embedded in the shell
  • A preparation method of broken carbon capsules with magnetic nanoparticles embedded in the shell
  • A preparation method of broken carbon capsules with magnetic nanoparticles embedded in the shell

Examples

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specific Embodiment approach 1

[0032] Specific embodiment 1: The preparation method of the broken carbon capsule with the shell embedded with magnetic nanoparticles in this embodiment comprises the following steps:

[0033] 1. Under certain reaction temperature conditions, add the polystyrene microsphere suspension dropwise into the aqueous solution containing the polymer monomer, sonicate for 1-30 minutes, and stir for 5-60 minutes to obtain dispersion A; wherein the polystyrene The mass ratio of polystyrene microspheres to polymer monomers in the ethylene microsphere suspension is 1: (0.05~1);

[0034] 2. Add iron source to the dispersion A, stir for 6-12 hours, then centrifuge for 5-30 minutes at a speed of 6000-12000 rpm / min; finally wash with deionized water for 2-5 times, and dry in an oven. Obtain product B; Wherein the mass ratio of iron source and polymer monomer is 1:(0.01~0.5);

[0035] 3. Put the product B in an atmosphere furnace, and calcine it at high temperature for 1-12 hours under the con...

specific Embodiment approach 2

[0036] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the reaction temperature in step 1 is 25°C-40°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the diameter of the polystyrene microspheres described in step 1 is 100 nm to 1000 nm. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a broken carbon capsule embedded with magnetic nanoparticles in a shell, relates to a preparation method of a broken carbon capsule, and aims at solving the problems that an existing preparation method of the broken capsule is low in crushing efficiency and a complete capsule which is not broken is frequently found out. The method comprises the steps of (1) dropwise adding a polystyrene microsphere suspension liquid to a water solution containing a polymer monomer, and carrying out ultrasonic stirring to obtain a dispersion liquid A; (2) adding an iron source to the dispersion liquid A, stirring, centrifuging, and carrying out washing and drying to obtain a product B; and (3) putting the product B into an atmosphere furnace, and carrying out high-temperature calcination under the condition of introducing an inert gas to obtain the broken magnetic nanoparticle / carbon capsule. The prepared broken capsule has a higher adsorption rate and higher catalytic activity than the complete capsule and has better recycling efficiency and stability, and the preparation process is simple and convenient. The preparation method is suitable for preparing the broken carbon capsule.

Description

technical field [0001] The invention relates to a preparation method of broken carbon capsules. Background technique [0002] In recent years, complete hollow capsules have been favored by researchers due to their high specific surface area, low density, and large pores. However, in practical applications, due to the barrier of the complete shell, the mass transfer between the inside and outside of the capsule is difficult, and the diffusion rate of the reactants in the solution to the inside of the capsule is slow; therefore, during the adsorption process, the complete capsule reaches the maximum adsorption equilibrium It takes a long time; during the catalytic process, the catalyst loaded on the inner surface cannot fully function, resulting in a reduction in catalytic activity. [0003] Carbon capsules have the advantages of wide sources, low price, small density, large specific surface area, many surface active sites and easy chemical modification, and are excellent ads...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28B01J23/745C02F1/28C02F1/00
CPCB01J20/0229B01J20/20B01J20/28009B01J20/28014B01J23/745B01J2220/4806B01J2220/4812C02F1/00C02F1/281C02F2101/308
Inventor 姚同杰关晨晨张军帅
Owner HARBIN INST OF TECH