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Preparation method and application method of carboxylated magnetic polymer microspheres

An application method, carboxylation technology, applied in the field of adsorption materials, can solve the problems of non-reusable, low adsorption efficiency of adsorption materials, etc.

Pending Publication Date: 2020-07-31
南京瑞贝西生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing and applying carboxylated magnetic polymer microspheres, so as to solve the defects that the adsorption materials in the prior art have low adsorption efficiency and cannot be reused.

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  • Preparation method and application method of carboxylated magnetic polymer microspheres
  • Preparation method and application method of carboxylated magnetic polymer microspheres
  • Preparation method and application method of carboxylated magnetic polymer microspheres

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preparation example Construction

[0032] Such as Figure 1 to Figure 5 Shown, a kind of preparation method of carboxylated magnetic polymer microspheres, described method comprises the steps:

[0033] Carboxylating the pretreated magnetic nanoparticles with 2,3-dimercaptosuccinic acid to obtain magnetic composite particles;

[0034] Dispersing the magnetic composite particles in an alkaline buffer, and reacting with 2,3-dimercaptosuccinic acid at room temperature under stirring;

[0035] The product obtained by the stirring reaction is separated under the action of a magnetic field to obtain a solid product;

[0036] The solid product is treated to remove impurities and dried to obtain carboxylated magnetic polymer microspheres.

[0037] In this embodiment, the method for pretreating the magnetic nanoparticles includes encapsulating the magnetic nanoparticles with polydopamine.

[0038] In this embodiment, the mass ratio of the magnetic nanoparticles to the 2,3-dimercaptosuccinic acid when the magnetic comp...

Embodiment 1

[0053] respectively by Fe 3 o 4 The mass ratio of @PDA to 2,3-dimercaptosuccinic acid (DMSA) is 1:0.5, 1:1, 1:1.5, 1:2, 1:2.5, 1:3 for functionalization, Fe 3 o 4 @PDA was ultrasonically dispersed in 50 mL of Tris buffer solution with pH=8.5, and then a certain amount of DMSA was added, and then stirred at room temperature for 8 h. After the reaction, the solid product was separated by an external magnetic field, washed repeatedly with water and ethanol to remove impurities, and dried to obtain carboxylated magnetic polymer microspheres (Fe 3 o 4 @PDA-COOH).

[0054] Fe will be produced 3 o 4 Add @PDA-COOH to 100mg / L methylene blue solution with pH=7, after 30min of adsorption, the adsorption effect is as follows figure 2 shown. from figure 2 It can be seen that with the increase of mass ratio, Fe 3 o 4 The adsorption capacity of @PDA-COOH magnetic polymer microspheres is also improving, and when the mass ratio reaches 1:2, the adsorption capacity reaches the high...

Embodiment 2

[0056] Take 0.04g Fe3 o 4 @PDA was ultrasonically dispersed in 50 mL of Tris buffer solution with pH=8.5, then 0.08 g of DMSA was added, and then stirred at room temperature for 8 h. After the reaction, the solid product was separated by an external magnetic field, washed repeatedly with water and ethanol to remove impurities, and dried to obtain carboxylated magnetic polymer microspheres (Fe 3 o 4 @PDA-COOH).

[0057] Take the same mass of Fe 3 o 4 @PDA-COOH was added to 100mg / L methylene blue solution of pH=2, pH=3, pH=4, pH=5, pH=6, pH=7, pH=8, pH=9 respectively, after adsorption for 30min , the adsorption effect is obtained as Figure 4 shown. from Figure 4 It can be seen that with the increase of solution pH, Fe 3 o 4 The zeta potential of @PDA-COOH decreased continuously, and the adsorption amount gradually increased accordingly. Since cationic dyes are unstable under alkaline conditions, the optimum adsorption pH=7 obtained in the experiment;

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Abstract

The invention discloses a preparation method and application method of carboxylated magnetic polymer microspheres, and relates to the technical field of adsorption materials. The preparation method comprises the following steps: carrying out a carboxylation reaction on pretreated magnetic nanoparticles and 2,3-dimercaptosuccinic acid to obtain magnetic composite particles; dispersing the magneticcomposite particles in an alkaline buffer solution, and carrying out a stirring reaction with 2,3-dimercaptosuccinic acid at room temperature; separating a product obtained by stirring reaction underthe action of a magnetic field to obtain a solid product; removing impurities from the solid product, and drying to obtain the carboxylated magnetic polymer microspheres. The carboxylated magnetic polymer microspheres prepared by the method are good in adsorption effect and high in adsorption efficiency, can be recycled for multiple times after desorption, are environment-friendly and economical,and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a preparation and application method of carboxylated magnetic polymer microspheres. Background technique: [0002] With the rapid development of industrialization, the demand and output of dyes are also increasing. At the same time, a large amount of dye wastewater is discharged directly without treatment, causing very serious environmental pollution and human health and safety problems. Most of the dyes are made of chemical products as the main raw materials. They are chemically stable, not easy to degrade, and have potential toxicity. Taking methylene blue as an example, through drinking water or the food chain, it will accumulate in the body, which may eventually lead to cancer and other problems. Therefore, there is an urgent need to treat dye wastewater. At present, the treatment methods of dye wastewater mainly include biodegradation, chemical treatment, physi...

Claims

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Application Information

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IPC IPC(8): B01J13/02B01J20/26B01J20/28B01J20/34C02F1/28C02F101/30
CPCB01J13/02B01J20/265B01J20/28009B01J20/28021B01J20/3425B01J20/3441B01J20/3475C02F1/288C02F2101/308C02F2303/16
Inventor 余浩程思瑶
Owner 南京瑞贝西生物科技有限公司
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