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A kind of sodium alginate-acrylamide composite hydrogel and its preparation method and application

A composite hydrogel and acrylamide technology, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of limiting the application of sodium alginate, poor mechanical properties, easy swelling, etc., to achieve Good multivalent ion adsorption capacity and biocompatibility, low cost, and the effect of avoiding stress defects

Active Publication Date: 2018-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sodium alginate can well complex with divalent and above metal ions, and has good adsorption performance; but pure sodium alginate is easy to swell in water and has poor mechanical properties, which greatly limits the application of sodium alginate

Method used

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  • A kind of sodium alginate-acrylamide composite hydrogel and its preparation method and application
  • A kind of sodium alginate-acrylamide composite hydrogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A sodium alginate-acrylamide composite hydrogel, and its preparation method includes the following steps:

[0035] Dissolve sodium alginate (SA) powder and acrylamide (AM) in ionized water at a mass ratio of 1:5 at room temperature to obtain a uniform mixture I. The total concentration of sodium alginate and acrylamide in the mixture I is 11 wt. %; then add N,N'-diallyl tartaric acid diamide and sodium persulfate in sequence, after dissolving, carry out vacuum defoaming treatment (evacuate to 0.02MPa, time is 2h), then add sodium bisulfite and mix well, Among them, the mass ratios of N,N'-diallyl tartrate diamide, sodium persulfate, sodium bisulfite and acrylamide monomer are 3.85:0.9:1.55:100 respectively, and then the resulting solution is transferred to the glass in a nitrogen atmosphere In the mold, after sealing, heat preservation and reaction at 70° C. for 2.5 hours to form the sodium alginate-acrylamide composite hydrogel.

[0036] The formed sodium alginate-acrylami...

Embodiment 2

[0039] A sodium alginate-acrylamide composite hydrogel, and its preparation method includes the following steps:

[0040] Dissolve sodium alginate (SA) powder and acrylamide (AM) in ionized water at a mass ratio of 1:7 at room temperature to obtain a uniform mixture I. The total concentration of sodium alginate and acrylamide in the mixture I is 13wt %; and then add divinylbenzene and potassium persulfate in turn, after dissolving, perform vacuum defoaming (vacuum to 0.015MPa, time is 1.3h), then add sodium sulfite and mix well, among which divinylbenzene, potassium persulfate, The mass ratios of sodium sulfite and acrylamide monomer were 2.95:1.9:2.35:100 respectively, and then the resulting solution was transferred to a glass mold in a nitrogen atmosphere, and after sealing, the alginic acid was formed by heat preservation and reaction at 60°C for 6 hours. Sodium-acrylamide composite hydrogel.

[0041] The formed sodium alginate-acrylamide composite hydrogel is taken out and cut...

Embodiment 3

[0044] A sodium alginate-acrylamide composite hydrogel, and its preparation method includes the following steps:

[0045] Dissolve sodium alginate (SA) powder and acrylamide (AM) in ionized water at a mass ratio of 1:9 at room temperature to obtain a uniform mixture I. The total concentration of sodium alginate and acrylamide in the mixture I is 15wt %; then add polyglycol diacrylate and sodium persulfate in sequence, after dissolving, perform vacuum defoaming treatment (vacuum to 0.01MPa, time is 2.5h), then add sodium thiosulfate and mix uniformly. The mass ratios of ethylene glycol diacrylate, sodium persulfate, sodium thiosulfate and acrylamide monomer were 4.8:0.1:0.25:100, respectively, and then the resulting solution was transferred to a glass mold in an argon atmosphere. After the reaction is kept at 45°C for 4 hours, the sodium alginate-acrylamide composite hydrogel is prepared by molding.

[0046] The formed sodium alginate-acrylamide composite hydrogel is taken out and ...

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Abstract

The invention discloses a sodium alginate-acrylamide composite aquagel. The preparation method comprises the following steps: 1) proportionally dissolving sodium alginate and acrylamide in water, and uniformly mixing; 2) sequentially adding a crosslinking agent and an initiator, carrying out vacuum degassing treatment, and adding a catalyst; and 3) transferring the obtained mixed solution into a glass mold, and heating to react, thereby obtaining the sodium alginate-acrylamide composite aquagel. The sodium alginate-acrylamide composite aquagel has favorable multivalent ion adsorption capacity and biocompatibility. By combining the polyacrylamide network with the graft copolymerization action of the sodium alginate and acrylamide, the mechanical properties of the aquagel are effectively enhanced. The aquagel is sensitive under the condition of different pH values, can generate intermolecular interactions with multiple cationic dyes and heavy metal ions, and is applicable to the fields of chemical substance adsorptive separation, sewage treatment and the like.

Description

Technical field [0001] The invention belongs to the field of environmental protection materials, and specifically relates to a sodium alginate-acrylamide composite hydrogel and a preparation method and application thereof. Background technique [0002] With the development of industry, the acceleration of urbanization and the expansion of population, my country is facing a very severe water environment situation. In recent years, major environmental pollution and accidents have occurred frequently in China, of which water pollution accidents account for about half. According to the statistics and analysis of the Ministry of Supervision, there are more than 1,700 water pollution accidents in my country every year, and water pollution has seriously affected the production and life of the people. On April 16, 2015, the State Council formally issued the "Water Pollution Prevention and Control Action Plan", and the "Water Ten Measures" were promulgated. The causes of serious water p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C02F1/28C02F1/62
CPCC02F1/285C02F1/62C08F251/00C08F220/56
Inventor 戴红莲康海飞魏雯颖吴艳增
Owner WUHAN UNIV OF TECH
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