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Core-shell structure polymer magnetic nanosphere with high Cr(VI) adsorption capacity as well as preparation method and application thereof

A technology of polymer magnetism and core-shell structure, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as uneven distribution, increase specific surface area, excellent cyclic adsorption performance, and save energy The effect of separating costs

Pending Publication Date: 2021-06-08
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts a layer-by-layer coating method to obtain a magnetic chitosan material with a single-core double-shell structure, wherein the chitosan is concentrated on the outer surface of the material, so that the adsorption active groups are distributed on the outer layer, thereby effectively solving the problem of hydrothermal Uneven distribution problems common in the preparation process of method and precipitation method

Method used

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  • Core-shell structure polymer magnetic nanosphere with high Cr(VI) adsorption capacity as well as preparation method and application thereof
  • Core-shell structure polymer magnetic nanosphere with high Cr(VI) adsorption capacity as well as preparation method and application thereof
  • Core-shell structure polymer magnetic nanosphere with high Cr(VI) adsorption capacity as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 2.7g FeCl in 80mL ethylene glycol at room temperature 3 ·6H 2 O, stir magnetically until it is clear and transparent, then add 7.2g NaAc, and continue stirring until the solid is completely dissolved. The mixed solution was transferred into a 100mL polytetrafluoroethylene-lined reaction kettle, and kept in an oven at 200°C for 16h at a constant temperature. After cooling to room temperature, discard the supernatant, wash the black precipitate several times with ethanol until the liquid is clear, separate the product with a permanent magnet, and then dry the solid under vacuum at 60°C for 12 hours to obtain Fe 3 o 4 Powder.

[0044] 0.5g Fe 3 o 4 Added to 20mL deionized water and 40mL ethanol, sonicated for 10min to make Fe 3 o 4 Evenly dispersed in the solution. Then 0.4 g of resorcinol and 0.8 g of formaldehyde were sequentially added to the suspension, the pH of the suspension was adjusted to 9 with aqueous ammonia, and finally the suspension was stir...

Embodiment 2

[0048] Dissolve 2.7g FeCl in 80mL ethylene glycol at room temperature 3 ·6H 2 O, stir magnetically until it is clear and transparent, then add 7.2g NaAc, and continue stirring until the solid is completely dissolved. The mixture was transferred into a 100mL polytetrafluoroethylene-lined reaction kettle, and kept in an oven at 200°C for 16h at a constant temperature. After cooling to room temperature, discard the supernatant, wash the black precipitate several times with ethanol until the liquid is clear, separate the product with a permanent magnet, and then vacuum dry the solid at 60°C for 12 hours to obtain Fe 3 o 4 Powder.

[0049] 0.5g Fe 3 o 4 Add to 20mL deionized water and 40mL ethanol, ultrasonic 13min to make Fe 3 o 4 Evenly dispersed in the solution. Then 0.4 g of resorcinol and 0.8 g of formaldehyde were added to the suspension in sequence, the pH of the solution was adjusted to 10 with ammonia water, and finally the mixed suspension was stirred at 30° C. fo...

Embodiment 3

[0053] Dissolve 2.7g FeCl in 80mL ethylene glycol at room temperature 3 ·6H 2 O, stir magnetically until it is clear and transparent, then add 7.2g NaAc, and continue stirring until the solid is completely dissolved. The mixed solution was transferred into a 100mL polytetrafluoroethylene-lined reaction kettle, and kept in an oven at 200°C for 16h at a constant temperature. After cooling to room temperature, discard the supernatant, wash the black precipitate several times with ethanol until the liquid is clear, and separate the product with a permanent magnet; vacuum-dry the filter cake at 60°C for 12 hours to obtain Fe 3 o 4 Powder.

[0054] 0.5g Fe 3 o 4 Add to 20mL deionized water and 40mL ethanol, ultrasonic 15min to make Fe 3 o 4 Evenly dispersed in the solution. Then 0.4 g of resorcinol and 0.8 g of formaldehyde were sequentially added to the suspension, the pH thereof was adjusted to 11 with aqueous ammonia, and finally the mixed suspension was stirred at 30° C....

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Abstract

The invention discloses a core-shell structure polymer magnetic nanosphere with high Cr(VI) adsorption capacity as well as a preparation method and application thereof. The preparation method comprises the following steps of adding Fe3O4 powder into a mixed solution of water and ethanol, carrying out ultrasonic treatment to uniformly disperse Fe3O4 in the solution, then sequentially adding resorcinol and formaldehyde into a suspension, adjusting the pH value, and carrying out a stirring reaction to obtain Fe3O4@RF, uniformly dispersing Fe3O4@RF in a chitosan solution, dropwise adding the prepared suspension into a mixed solution of paraffin and span, stirring for a period of time, then adding a glutaraldehyde aqueous solution, and stirring for reaction to obtain the magnetic chitosan nanospheres. The magnetic chitosan nanospheres prepared by the method can be used for adsorbing Cr(VI) in an aqueous solution. The magnetic chitosan nanospheres prepared by the invention not only have higher adsorption capacity on Cr(VI), but also can realize rapid separation through an external magnetic field after adsorption, and have excellent cyclic adsorption performance.

Description

technical field [0001] The invention belongs to the technical field of heavy metal ion adsorption materials, especially the technical field of highly toxic pollutant Cr(Ⅵ) adsorption, and specifically relates to a core-shell structure polymer magnetic nanosphere with high Cr(Ⅵ) adsorption capacity and a preparation method thereof and apply. Background technique [0002] Chromium is a common toxic heavy metal ion in industrial wastewater, usually in two oxidation states, trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). The toxicity of Cr(Ⅵ) is much higher than that of Cr(Ⅲ), usually HCrO 4 - and CrO 4 2- form in acidic wastewater. Commonly used heavy metal ion removal methods include precipitation, biodegradation, adsorption, ion exchange, and membrane separation. Compared with other treatment methods, the adsorption method has the advantages of simplicity, high efficiency, and wide application range. The surface of chitosan is rich in amino groups and hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J20/06B01J20/22B01J20/28009C02F1/286C02F1/281C02F1/285C02F2101/22B01J20/3204B01J20/3293B01J20/3272B01J20/3219B01J20/28019C02F1/288C02F2305/08C02F1/488C02F2303/16B01J20/262B01J20/28021B01J20/3223B01J20/3289
Inventor 蔡卫权姜易虹
Owner GUANGZHOU UNIVERSITY
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