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Preparation method of alginate-graphene compound double-network gel beads

A graphene composite and alginate technology, applied in the field of gel research, to achieve the effects of good saline-alkali stability and adsorption capacity, improved specific surface area, and improved mechanical properties and chemical stability

Inactive Publication Date: 2015-07-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the formation of double network gels in natural polymers by graphene gels

Method used

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  • Preparation method of alginate-graphene compound double-network gel beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take five beakers, add 40mg, 80mg, 160mg graphite oxide and 20mL distilled water to the five groups of beakers respectively, ultrasonicate for 6h until the solution is uniform, and obtain 2mg / mL, 4mg / mL, 8mg / mL graphene oxide solutions, respectively add to each Dissolve 20 mg of sodium alginate in the solution, and stir mechanically for 1 hour until a uniform solution is formed. Take another five sets of beakers, all equipped with 10mg / mL CaCl 2 solution, the graphene oxide / sodium alginate solution was dropped into CaCl with a peristaltic pump 2 solution to obtain graphene oxide-loaded alginate gel balls (single-network gel). Take another five beakers, weigh and dissolve ascorbic acid with a mass ratio of 1:1 to graphite oxide, put the single-network gel ball into the ascorbic acid solution and heat for 8 hours to obtain double-network gel balls with different graphene contents. Graphene oxide, single network gel, double network gel for X-ray diffraction analysis, suc...

Embodiment 2

[0035] Take five beakers, add 40mg, 80mg, 160mg graphite oxide and 20mL distilled water to the five groups of beakers respectively, sonicate for 6h until the solution is uniform, and obtain 2mg / mL, 4mg / mL, 8mg / mL graphene oxide solutions, respectively add to each Dissolve 20 mg of sodium alginate in the solution, and stir mechanically for 1 hour until a uniform solution is formed. Take another five sets of beakers, all equipped with 10mg / mL CaCl 2 solution, the graphene oxide / sodium alginate solution was dropped into CaCl with a peristaltic pump 2 solution to obtain graphene oxide-loaded alginate gel balls (single-network gel). Take another five beakers, weigh and dissolve glutathione with a mass ratio of 1:1 to graphite oxide, put the single-network gel ball into the glutathione solution and heat at 60°C for 8 hours to obtain different graphene contents double network gel balls.

Embodiment 3

[0037] Take five beakers, add 40mg, 80mg, 160mg graphite oxide and 20mL distilled water to the five groups of beakers respectively, sonicate for 6h until the solution is uniform, and obtain 2mg / mL, 4mg / mL, 8mg / mL graphene oxide solutions, respectively add to each Dissolve 20 mg of sodium alginate in the solution, and stir mechanically for 1 hour until a uniform solution is formed. Take another five sets of beakers, all equipped with 10mg / mL CaCl 2 solution, the graphene oxide / sodium alginate solution was dropped into CaCl with a peristaltic pump 2 solution to obtain graphene oxide-loaded alginate gel balls (single-network gel). Take another five beakers, weigh and dissolve sodium bicarbonate with a mass ratio of 1:1 to graphite oxide, put the single-network gel ball into the sodium bicarbonate solution and heat at 80°C for 8 hours to obtain double-networks with different graphene contents. gel balls.

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Abstract

The invention relates to a preparation method of alginate-graphene compound double-network gel beads. The preparation method comprises the following steps: (1) adding graphene oxide into an aqueous solution and carrying out ultrasonic treatment to prepare a uniform graphene oxide aqueous solution; (2) adding alginate into the graphene oxide aqueous solution and mechanically stirring to prepare a uniform mixed solution; (3) preparing a bivalent salt ion solution with a certain concentration and dropwise adding a peristaltic pump mixed solution into the bivalent salt ion solution at 0-100 DEG C to prepare alginate single-network gel beads loaded with the graphene oxide; (4) adding the single-network gel beads into an aqueous solution containing a reducing agent and carrying out water bath heat treatment to prepare the alginate-graphene compound double-network gel beads. Compared with the prior art, the preparation method is simple in process and liable to popularize; the prepared alginate-graphene compound double-network gel beads are excellent in resistance to salt and alkali, large in specific surface area and high in adsorbability.

Description

technical field [0001] The invention belongs to the technical field of gel research, and relates to a preparation method of double-network gel balls, in particular to a preparation method of alginate-graphene composite double-network gel balls. Background technique [0002] Sodium alginate is a natural polysaccharide carbohydrate extracted from the brown algae kelp or sargassum. Sodium alginate has the advantages of good thickening, good film-forming properties, high gel strength, and good filamentation. Sodium alginate can cross-link in divalent salt ion solution to form a gel. This process is a reversible reaction. Therefore, alginate gel spheres can be destabilized again in monovalent salt ions. In addition, alginate gel balls are highly swellable, and the swelling increases with the increase of pH, so they are easy to burst at high pH. [0003] In order to overcome the above disadvantages, many studies have loaded inorganic particles on the alginate gel balls to reduce...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J20/24B01J20/28B01J20/30
Inventor 马杰庄媛陈君红张蓝心陈春阳李程
Owner TONGJI UNIV
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