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Carboxymethyl chitosan/graphene oxide composite hydrogel and preparation and application thereof

A carboxymethyl chitosan and graphene composite technology, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. Effect of handling, good mechanical strength, good application prospects

Inactive Publication Date: 2018-04-03
FOSHAN GAOMING DISTRICT MINGCHENG TOWN NEW ENERGYNEW MATERIAL IND TECH INNOVATION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because carboxymethyl chitosan is soluble in water, it is difficult to completely separate the complex from the system after the adsorption is completed. Therefore, a metal ion adsorption material with strong adsorption capacity and easy separation from the system has been explored. practical meaning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take by weighing carboxymethyl chitosan 5g, be dissolved in 95g water and make the aqueous solution that mass concentration is 5%, magnetic stirring is until carboxymethyl chitosan dissolves completely, then adds 33mL graphene oxide aqueous solution (wherein the content of graphene oxide 5.0 mg / mL), stirred at 300 r / min for 1 h to obtain a homogeneously dispersed carboxymethyl chitosan and graphene oxide dispersion. Add 0.075g of TPMDMTI dropwise under stirring, ultrasonic defoaming (power 300w, time 15min), react at room temperature for 3h, squeeze and filter out excess water, and obtain carboxymethyl chitosan / graphene oxide composite hydrogel .

Embodiment 2

[0035] Take by weighing carboxymethyl chitosan 10g, be dissolved in 190g water and make the aqueous solution that mass concentration is 5%, magnetic stirring is until carboxymethyl chitosan dissolves completely, then adds 57ml graphene oxide aqueous solution (wherein the content of graphene oxide 5.0 mg / mL), stirred at 350 r / min for 1 h to obtain a homogeneously dispersed carboxymethyl chitosan and graphene oxide dispersion. Add 0.175g of TPMDMTI dropwise under stirring, ultrasonic defoaming (power 350w, time 15min), react at room temperature for 3.5h, squeeze and filter out excess water, and obtain carboxymethyl chitosan / graphene oxide composite hydrogel glue.

Embodiment 3

[0037] Take by weighing carboxymethyl chitosan 15g, be dissolved in 285g water and make the aqueous solution that mass concentration is 5%, magnetic stirring is until carboxymethyl chitosan dissolves completely, then adds 75ml graphene oxide aqueous solution (wherein the content of graphene oxide 5.0 mg / mL), stirred at 400 r / min for 1 h to obtain a homogeneously dispersed carboxymethyl chitosan and graphene oxide dispersion. Add 0.30g of TPMDMTI dropwise under stirring, ultrasonic defoaming (power 400w, time 20min), react at room temperature for 4h, squeeze and filter out excess water, and obtain carboxymethyl chitosan / graphene oxide composite hydrogel .

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Abstract

The invention belongs to the technical field of functional materials, and discloses a carboxymethyl chitosan / graphene oxide composite hydrogel and preparation and application thereof. The preparationmethod of the carboxymethyl chitosan / graphene oxide composite hydrogel comprises the following steps: weighing a carboxymethyl chitosan aqueous solution; adding a certain amount of graphene oxide aqueous solution; stirring to obtain uniformly-distributed carboxymethyl chitosan and graphene oxide dispersing liquid; dropwise adding a certain amount of TPMDMTI while stirring is performed; ultrasonically defoaming; carrying out a reaction for a while under room temperature to obtain the carboxymethyl chitosan / graphene oxide composite hydrogel; the mass concentration of the carboxymethyl chitosan aqueous solution is 10%. The preparation method is simple in preparation processes, easy to operate, and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a carboxymethyl chitosan / graphene oxide composite hydrogel and its preparation and application. Background technique [0002] Chitosan, also known as deacetylated chitin, has a certain amount of amino groups and hydroxyl groups on its surface, which can complex metal ions and form relatively stable complexes, which can effectively adsorb metal ions in solution. Chitosan cannot be directly dissolved in aqueous solution, but can only be dissolved in acidic solution. However, under acidic conditions, chitosan is easy to degrade and the amino group on its surface mainly exists in the form of -NH3+, which is not easy to complex with metal ions and is very To a large extent, its application in the field of wastewater treatment and purification is limited. [0003] Carboxymethyl chitosan is a water-soluble chitosan derivative prepared by reacting chitosan with chloroacetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08K3/04C08L5/08C08B37/08C02F1/28C02F101/20C02F103/16
CPCC08J3/075C02F1/288C02F2101/20C02F2103/16C08B37/003C08J2305/08C08K3/04C08L2201/54C08L5/08
Inventor 黄莉
Owner FOSHAN GAOMING DISTRICT MINGCHENG TOWN NEW ENERGYNEW MATERIAL IND TECH INNOVATION CENT