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Magnetic mesoporous polydopamine composite material with core-shell structure as well as preparation method and application of magnetic mesoporous polydopamine composite material

A mesoporous polydopamine, core-shell structure technology, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problems of slow adsorption rate of heavy metals, lack of active sites, low removal efficiency, etc., to achieve convenient The effects of large-scale industrial production and application, efficient and fast capture, and efficient and fast removal

Active Publication Date: 2021-01-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, dense polydopamine coatings usually have low specific surface area, lack of active sites and low mass transfer rate, resulting in slow adsorption rate and low removal efficiency of heavy metals.

Method used

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  • Magnetic mesoporous polydopamine composite material with core-shell structure as well as preparation method and application of magnetic mesoporous polydopamine composite material
  • Magnetic mesoporous polydopamine composite material with core-shell structure as well as preparation method and application of magnetic mesoporous polydopamine composite material
  • Magnetic mesoporous polydopamine composite material with core-shell structure as well as preparation method and application of magnetic mesoporous polydopamine composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: Preparation of a magnetic mesoporous polydopamine composite with core-shell structure

[0064] (1) 1 part by mass of Fe 3 o 4 (spherical, 20nm), 5 parts by mass of Pluronic F127 and 5 parts by mass of mesitylene are dispersed in 154 parts by volume of deionized water to form a uniform emulsion;

[0065] (2) 1.2 parts by mass of dopamine hydrochloride were dispersed in 10 parts by volume of deionized water, and then added dropwise to the above-mentioned emulsion at a rate of 2 mL / min to obtain a reaction solution;

[0066] (3) Quickly add 4.1 parts by mass of 25 wt% ammonia water to the above reaction solution to promote the polymerization of dopamine monomer, react at 90°C with a mechanical stirring rate of 250rpm for 24h, magnetically separate, take the precipitate, wash with water until the template agent is completely removed, and freeze After drying for 24 hours, a magnetic mesoporous polydopamine composite material with a core-shell structure was obtai...

Embodiment 2

[0068] Example 2: Preparation of a core-shell magnetic mesoporous polydopamine composite material

[0069] (1) 1 part by mass of Fe 3 o 4 (spherical, 20nm), 1.25 parts by mass of Pluronic F127 and 1.25 parts by mass of mesitylene are dispersed in 154 parts by volume of deionized water to form a uniform emulsion;

[0070] (2) 1.2 parts by mass of dopamine hydrochloride were dispersed in 7.7 parts by volume of deionized water, and then added dropwise to the above-mentioned emulsion at a rate of 2 mL / min to obtain a reaction solution;

[0071] (3) 4.1 parts by mass of 25% ammonia water was quickly added to the above reaction solution to promote the polymerization of dopamine monomer, reacted at 70° C. with a mechanical stirring rate of 200 rpm for 36 hours, magnetically separated, washed with water until the template was completely removed, and freeze-dried for 24 hours. A magnetic mesoporous polydopamine composite material with a core-shell structure was obtained.

[0072] Us...

Embodiment 3

[0073] Example 3: Preparation of a core-shell magnetic mesoporous polydopamine composite material

[0074] (1) 1 part by mass of Fe 3 o 4 (spherical, 20nm), 5 parts by mass of Pluronic F127 and 5 parts by mass of mesitylene are dispersed in 154 parts by volume of deionized water to form a uniform emulsion;

[0075] (2) 3.08 parts by mass of dopamine hydrochloride were dispersed in 15.4 parts by volume of deionized water, and then added dropwise to the above-mentioned emulsion at a rate of 2 mL / min to obtain a reaction solution;

[0076] (3) 4.1 parts by mass of 25% ammonia water was quickly added to the above reaction solution to promote the polymerization of dopamine monomer, reacted at 80° C. with a mechanical stirring rate of 350 rpm for 12 hours, magnetically separated, washed with water until the template agent was completely removed, and freeze-dried for 12 hours. A magnetic mesoporous polydopamine composite material with a core-shell structure is obtained.

[0077]Us...

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Abstract

The invention belongs to the technical field of environmental functional nano materials, and discloses a magnetic mesoporous polydopamine composite material with a core-shell structure as well as a preparation method and application of the magnetic mesoporous polydopamine composite material. The preparation method comprises the steps of by taking magnetic nanoparticles as an inner core, a triblockpolymer as a template agent and an organic pore-enlarging agent as an auxiliary template agent, carrying out in-situ oxidative polymerization on dopamine monomers on the surfaces of the magnetic nanoparticles under a weakly alkaline condition to form the magnetic mesoporous polydopamine composite material with the core-shell structure. The preparation method is simple in process, the obtained nano composite material has high specific surface area and pore volume, a large-size mesoporous structure, biocompatibility and strong magnetism, the adsorption capacity of the nano composite material toheavy metal chromium can reach 522.74 mg / g when the nano composite material is used as an adsorption material, and the nano composite material has the characteristics of high adsorption rate, high removal rate and the like, can be recycled, and can be widely applied to the field of environmental governance.

Description

technical field [0001] The invention belongs to the technical field of environmental functional nanometer materials, and in particular relates to a magnetic mesoporous polydopamine composite material with a core-shell structure and a preparation method and application thereof. Background technique [0002] With the rapid development of my country's industry, a large amount of waste containing heavy metals is directly or indirectly discharged into the environment. Heavy metal ion pollution has the characteristics of refractory degradation, easy migration, and high toxicity, which seriously threatens the balance of the ecosystem and human health. Therefore, the prevention, control and treatment of heavy metal pollution has become an urgent problem in the current environmental pollution restoration. At present, commonly used heavy metal pollution remediation technologies and methods mainly include: precipitation, chemical oxidation / reduction, membrane filtration, ion exchange, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28B09C1/00B09C1/08C02F101/20
CPCB01J20/26B01J20/28009B01J20/28083C02F1/285B09C1/00B09C1/08C02F2101/20
Inventor 章莉娟杨谦王慧琳庾明茂
Owner SOUTH CHINA UNIV OF TECH
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