Method for preparing functional group modified alginate-graphene dual-network nano-composite gel beads

An alginate and nanocomposite technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as less double network gel, achieve easy promotion, hydroxyl and carboxyl functional groups The effect of increasing the content and enhancing the adsorption capacity

Inactive Publication Date: 2016-08-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the modification of double network gels. Since both sodium alginate and graphene oxide contain hydroxyl and carboxyl groups, it is expected to further improve the adsorption performance by further increasing the content of hydroxyl and carboxyl groups in the material.

Method used

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  • Method for preparing functional group modified alginate-graphene dual-network nano-composite gel beads
  • Method for preparing functional group modified alginate-graphene dual-network nano-composite gel beads
  • Method for preparing functional group modified alginate-graphene dual-network nano-composite gel beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, take three beakers, add 40mg graphene oxide, 20mg sodium alginate and 20mL distilled water, respectively add 5, 10 and 20mg polyvinyl alcohol to the three beakers, ultrasonically 6h to, mechanically stir for 1h to form a uniform solution . Take another three beakers, all equipped with 20mL of 10mg / mL CaCl 2 solution, drop the graphene oxide / sodium alginate / polyvinyl alcohol solution into CaCl with a peristaltic pump 2 solution to obtain hydroxylated single network gel spheres.

[0025] Step 2, take another three beakers, weigh and dissolve ascorbic acid with a mass ratio of 1:1 to graphene oxide, put the hydroxylated single-network gel spheres into the ascorbic acid solution and heat for 8h to obtain hydroxylated double-network nanocomposite gels. Gumball. Soak the obtained hydroxylated double network in 100 mL of 1% FeCl 3 In the solution, configure 100mL H of a certain concentration 2 O 2 solutions (1, 2 and 5% by mass), will soak the FeCl with the doubl...

Embodiment 2

[0030] Take three beakers, add 80 mg of graphene oxide, 20 mg of sodium alginate and 20 mL of distilled water, respectively, add 5, 10 and 20 mg of polyvinyl alcohol to the three beakers, ultrasonicate for 6 hours, and mechanically stir for 1 hour to form a uniform solution. Take another three beakers, all equipped with 20mL of 10mg / mL BaCl 2 solution, drop the graphene oxide / sodium alginate / polyvinyl alcohol solution into CaCl with a peristaltic pump 2 solution to obtain hydroxylated single network gel spheres. Take another three beakers, weigh and dissolve ascorbic acid with a mass ratio of 1:1 to graphene oxide, put the hydroxylated single-network gel spheres in the ascorbic acid solution and heat for 8 hours to obtain the hydroxylated double-network nanocomposite gel spheres. Soak the obtained hydroxylated double network in 100 mL of 1% FeCl 3 In the solution, configure 100mL H of a certain concentration 2 O 2 solutions (1, 2 and 5% by mass), will soak the FeCl with th...

Embodiment 3

[0032] Take three beakers, add 40 mg of graphene oxide, 20 mg of sodium alginate and 20 mL of distilled water, respectively, add 5, 10 and 20 mg of polyvinyl alcohol to the three beakers, ultrasonicate for 6 hours, and mechanically stir for 1 hour to form a uniform solution. Take another three beakers, all equipped with 20mL of 10mg / mL BaCl 2 solution, drop the graphene oxide / sodium alginate / polyvinyl alcohol solution into CaCl with a peristaltic pump 2 solution to obtain hydroxylated single network gel spheres. Take another three beakers, weigh and dissolve sodium borohydride with a mass ratio of 1:1 to graphene oxide, put the hydroxylated single-network gel spheres into the sodium borohydride solution and heat for 8 hours to obtain hydroxylated double-network nanocomposite Gel balls. Soak the obtained hydroxylated double network in 100 mL of 1% FeCl 3 In the solution, configure 100mL H of a certain concentration 2 O 2 solutions (1, 2 and 5% by mass), will soak the FeCl ...

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Abstract

The invention discloses a method for preparing functional group modified alginate-graphene dual-network nano-composite gel beads. The method comprises the following steps: adding graphene oxide, sodium alginate and polyving alcohol into an acid, alkali or neutral solution, and stirring with ultrasonic waves till a uniform solution is obtained; dripping the mixed solution into a divalent saline ion solution so as to obtain hydroxylation single-network gel beads, and performing water bath heating on the gel beads in a solution with a reducing agent, so as to obtain the hydroxylation dual-network nano-composite gel beads. Compared with pure sodium alginate gel and single-network gel, the dual-network gel prepared by using the method is relatively good in salt and alkali resistance and adsorption property. Carboxylation dual-network can be prepared by soaking the prepared hydroxylation dual-network in a FeCl3 solution and dripping an H2O2 solution drip by drip under ultraviolet radiation and magnetic stirring. Compared with unmodified gel beads, the hydroxylation and carboxylation dual-network nano-composite gel beads are relatively good in adsorption property.

Description

technical field [0001] The present invention aims to invent a preparation method of functional group modified alginate-graphene double network nanocomposite gel spheres. Background technique [0002] As a natural polymer, sodium alginate was passed through CaCl 2 Gel microspheres prepared by solution crosslinking are widely used for dyes and heavy metals in water. The loading of functionalized materials on sodium alginate microspheres and their application in adsorption has become a hot research topic, especially nanomaterials and magnetic materials. Nanomaterials are popular materials in the field of adsorbents, and carbon nanoscience is one of the most important and active research fields in nanoscience research. Following fullerenes and carbon nanotubes, a series of new materials such as nanohorn, graphdiyne and graphene have appeared in the field of carbon nanomaterials, and have shown an irreplaceable important position in human production and life, represented by grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/26C02F1/28C02F101/20C02F101/34C02F101/36C02F101/38
CPCB01J20/0262B01J20/20B01J20/24B01J20/267B01J2220/4806B01J2220/4812B01J2220/4825B01J2220/4843C02F1/285C02F1/286C02F1/288C02F2101/20C02F2101/34C02F2101/36C02F2101/38
Inventor 马杰庄媛陈君红陈晓燕
Owner TONGJI UNIV
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