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A kind of amphoteric adsorption material with salt resistance and its preparation method and application

A technology of adsorption material and salt resistance, applied in the field of intelligent polymer materials, can solve the problems of limited application and decreased adsorption performance, and achieve the effect of excellent adsorption performance, excellent salt resistance and good adsorption effect.

Active Publication Date: 2021-08-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for this type of hydrogel to maintain good adsorption performance for anionic or cationic dyes, and the adsorption performance is severely reduced in a high-salt environment, which limits its application in wastewater treatment.

Method used

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  • A kind of amphoteric adsorption material with salt resistance and its preparation method and application
  • A kind of amphoteric adsorption material with salt resistance and its preparation method and application
  • A kind of amphoteric adsorption material with salt resistance and its preparation method and application

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preparation example Construction

[0029] One embodiment of the present invention proposes a preparation method of an amphoteric adsorption material with salt resistance, comprising the following steps:

[0030] Add maleic acid (MA), acrylamide (AM), dimethylaminoethyl methacrylate (DMAEMA) to the polyvinyl alcohol (PVA) solution, after the first mixing, add the crosslinking agent, the second mixing Finally, add initiator to obtain hydrogel prepolymerization solution;

[0031] The above-mentioned hydrogel prepolymerization solution is reacted under constant temperature conditions to obtain an amphoteric adsorption material.

[0032] The embodiment of the present invention proposes a preparation method of an amphoteric adsorption material with salt resistance, mixing PVA solution with monomers MA, AM, and DMAEMA, and forming a hydrogel prepolymerization solution under the action of a crosslinking agent and an initiator , after a constant temperature heating reaction, a porous double network hydrogel is formed, ...

Embodiment 1

[0052] Example 1 A kind of preparation method of amphoteric adsorption material (PVA / MA / AM / DM), comprises the steps:

[0053] ① First, add 1g of MA, 1g of AM and 2g of DMAEMA to 20ml of PVA solution with a mass fraction of 5%, and then magnetically stir for 3 minutes to form a homogeneous solution, then add 0.16g of cross-linking agent BIS, and continue to magnetically stir for 5 minutes to form a homogeneous solution After adding 0.027g initiator K 2 S 2 o 8 , after stirring for 10 s, a homogeneous hydrogel prepolymer solution was obtained.

[0054] ② Inject the hydrogel pre-polymerization solution in ① into a 4ml centrifuge tube mold and seal it, then place it in a constant temperature water bath for reaction, set the temperature at 70°C, and after 2 hours, the porous double-network hydrogel will be cross-linked and formed.

[0055] ③ Cool the hydrogel in ② for 12 hours, put it into deionized water and purify it for 7 days, and dry the purified hydrogel at 60°C to obtai...

Embodiment 2

[0056] Example 2 A kind of preparation method of amphoteric adsorption material

[0057] ① First, add monomer 0.6g MA, 0.6g AM and DMAEMA 1.256g to 15ml of PVA solution with a mass fraction of 5%, and then magnetically stir for 2min to form a homogeneous solution. After homogeneous solution, add 0.027g initiator K 2 S 2 o 8 , after stirring for 10 s, a homogeneous hydrogel prepolymer solution was obtained.

[0058] ② Inject the homogeneous hydrogel pre-polymerization solution into a 12-well cell culture plate and seal it, and react at 65°C for 3 hours to form a porous double-network hydrogel.

[0059] ③ same as embodiment 1.

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Abstract

The invention provides an amphoteric adsorption material with salt resistance, a preparation method and application thereof, and belongs to the technical field of intelligent polymer materials. The method includes the following steps: adding maleic acid, acrylamide and dimethylaminoethyl methacrylate into the polyvinyl alcohol solution, adding a crosslinking agent after the first mixing, adding an initiator after the second mixing, A hydrogel prepolymer solution is obtained; the above hydrogel prepolymer solution is reacted under constant temperature conditions to obtain an amphoteric adsorption material. The amphoteric adsorption material proposed in the present invention is mainly used for the adsorption of ionic pollutants, and the amphoteric adsorption material has excellent adsorption performance for adsorbing both anionic and cationic dyes. In addition, it has excellent salt resistance, and can still maintain a good adsorption effect under high salt concentration (10-20g / L).

Description

technical field [0001] The invention relates to the technical field of intelligent polymer materials, in particular to an amphoteric adsorption material with salt resistance and its preparation method and application. Background technique [0002] pH-sensitive hydrogels are a class of intelligent polymer hydrogels with pH-sensitive properties. This type of gel contains a large number of easily hydrolyzed or protonated weakly acidic or weakly basic groups, which can change according to the pH value of the environment. Release or capture, making the hydrogel absorb water to swell or syneresis. [0003] From the perspective of molecular structure, pH-sensitive hydrogels are composed of backbone polymers with weakly acidic (alkaline) groups. Among them, the main chain polymer is a macromolecular network structure formed by cross-linking or interpenetration between linear polymers, which is used to support the mechanical stability of the hydrogel, and the weak acid (base) groups...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/262B01J20/28047C02F1/285C02F2101/308
Inventor 李政于秋灵朱金忠巩继贤李秋瑾张健飞
Owner TIANJIN POLYTECHNIC UNIV
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