Surface negatively-charged functional melamine sponge as well as preparation method and application thereof

A melamine sponge and negatively charged technology is applied in the field of functionalized melamine sponge and its preparation, and achieves the effects of easy availability of raw materials, simple operation and low processing cost

Active Publication Date: 2019-08-23
中科广化(重庆)新材料研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a zwitterionic polyelectrolyte, polydopamine, even if its electronegativity is adjusted by changing the pH of the solution, its charge density is always smaller than that of some general anion and cationic polyelectrolytes, so only by changing the chargeability of polydopamine to enhance Affinity to charged pollutants to improve sorbent capacity is limited

Method used

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  • Surface negatively-charged functional melamine sponge as well as preparation method and application thereof
  • Surface negatively-charged functional melamine sponge as well as preparation method and application thereof
  • Surface negatively-charged functional melamine sponge as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0048] 1. Pretreatment of materials:

[0049] The melamine sponge was cut into 3cm×3cm×3cm squares, then soaked in acetone, ethanol, and deionized water for 10 minutes, then ultrasonically cleaned for 10 minutes, and then dried in an electric blast drying oven at 60°C for later use. This step can effectively remove a small amount of impurities in the melamine sponge.

[0050] 2. Modification of melamine sponge:

[0051] (1) Soak the melamine sponge in 200mL with a concentration of 2mg·mL -1 In the dopamine solution (the solvent adopted by the dopamine solution is a Tris-HCl buffer solution with a pH of 8.5 and a concentration of 50 mM), the dopamine is fully oxidized and polymerized on the surface of the substrate, the reaction temperature is 25 ° C, and the time is 12 hours to obtain polydopamine Modified melamine sponge;

[0052] (2) Soak the polydopamine-modified melamine sponge in step (1) in a solution whose pH is adjusted to 3 with hydrochloric acid and activate for 6...

Embodiment 2

[0055] 1. Pretreatment of materials:

[0056] The melamine sponge was cut into 3cm×3cm×3cm squares, then soaked in acetone, ethanol, and deionized water for 10 minutes, then ultrasonically cleaned for 10 minutes, and then dried in an electric blast drying oven at 60°C for later use. This step can effectively remove a small amount of impurities in the melamine sponge.

[0057] 2. Modification of melamine sponge:

[0058] (1) Soak the melamine sponge in 200mL with a concentration of 2mg·mL -1 In the dopamine solution (the solvent adopted by the dopamine solution is a Tris-HCl buffer solution with a pH of 8.5 and a concentration of 50 mM), the dopamine is fully oxidized and polymerized on the surface of the substrate, the reaction temperature is 25 ° C, and the time is 12 hours to obtain polydopamine Modified melamine sponge;

[0059] (2) Soak the polydopamine-modified melamine sponge in step (1) in a solution whose pH is adjusted to 3 with hydrochloric acid and activate for 6...

Embodiment 3

[0062] 1. Pretreatment of materials:

[0063] The melamine sponge was cut into 3cm×3cm×3cm squares, then soaked in acetone, ethanol, and deionized water for 10 minutes, then ultrasonically cleaned for 10 minutes, and then dried in an electric blast drying oven at 60°C for later use. This step can effectively remove a small amount of impurities in the melamine sponge.

[0064] 2. Modification of melamine sponge:

[0065] (1) Soak the melamine sponge in 200mL with a concentration of 2mg·mL -1 In the dopamine solution (the solvent adopted by the dopamine solution is a Tris-HCl buffer solution with a pH of 8.5 and a concentration of 50 mM), the dopamine is fully oxidized and polymerized on the surface of the substrate, the reaction temperature is 25 ° C, and the time is 12 hours to obtain polydopamine Modified melamine sponge;

[0066] (2) Soak the polydopamine-modified melamine sponge in step (1) in a solution whose pH is adjusted to 3 with hydrochloric acid and activate for 6...

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Abstract

The invention discloses a surface negatively-charged functional melamine sponge as well as a preparation method and application thereof, and belongs to the field of chemical synthesis functional polymer materials. The preparation method comprises the following steps: a melamine sponge is modified by using polydopamine, the polydopamine-modified melamine sponge is activated in an acidic solution for a certain period of time to make amino of the polydopamine on the surface of the sponge fully protonated, so that the surface of the sponge has as much positive charges as possible, a certain amountof an anionic polyelectrolyte is added in the activated solution system, electrostatic self-assembly is performed, and therefore the stable surface negatively-charged functional melamine sponge is prepared. According to the method provided by the invention, the surface negatively-charged functional melamine sponge prepared by the method has higher adsorption performance and recovery efficiency for cationic dyes and heavy metal ion contaminants on the basis of maintaining excellent adsorption capacity of a substrate, has low treatment costs and simple and convenient operation, and can be recycled and used for a plurality of times; and the surface negatively-charged functional melamine sponge can be used to adsorb the cationic dyes and the heavy metal ions in wastewater.

Description

technical field [0001] The invention belongs to the field of chemically synthesized functional polymer materials, specifically to the technical field of preparation of functionalized porous materials, and relates to a negatively charged functionalized melamine sponge on the surface and a preparation method and application thereof. Background technique [0002] With the rapid advancement of industrialization and urbanization around the world, a large amount of harmful waste produced in the process of human production and life is discharged into the air, water and soil. These pollutants will not only destroy the natural landscape and ecological environment, but also restrict the economy and The rapid development of society directly endangers the health of organisms, especially human beings themselves. Dyes and heavy metal ions are two main pollutants in the current water environment. Among the many methods for treating wastewater containing dyes and heavy metal ions, the adsor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/36B01J20/26B01J20/30C02F1/28C02F101/30C02F101/34C02F101/36C02F101/38C02F101/20C02F101/22C08L61/28
CPCC08J9/40C08J9/36B01J20/265C02F1/285C08J2361/28C02F2101/308C02F2101/34C02F2101/36C02F2101/40C02F2101/38C02F2101/20C02F2101/22C02F2101/206
Inventor 王斌文富彬黄月文陈金明雷春艳
Owner 中科广化(重庆)新材料研究院有限公司
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