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Preparation method of three-dimensional graphene oxide/polyethyleneimine/carboxymethyl cellulose composite material

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose is applied in the field of preparation of three-dimensional graphene oxide/polyethyleneimine/carboxymethyl cellulose composite material, which can solve the problem of low adsorption capacity and poor reusability , the problem of high cost, to achieve the effect of simple preparation method, low cost, and improved adsorption performance

Inactive Publication Date: 2018-06-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although graphene oxide and its composites exhibit good adsorption properties for heavy metal ions, there are generally problems such as low adsorption capacity, high cost, and poor reusability.

Method used

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  • Preparation method of three-dimensional graphene oxide/polyethyleneimine/carboxymethyl cellulose composite material
  • Preparation method of three-dimensional graphene oxide/polyethyleneimine/carboxymethyl cellulose composite material
  • Preparation method of three-dimensional graphene oxide/polyethyleneimine/carboxymethyl cellulose composite material

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Experimental program
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Embodiment 1

[0025] (1) Preparation of graphene oxide / polyethyleneimine: place 0.2 g of graphite oxide in deionized water to obtain a graphene oxide dispersion by ultrasonication, adjust the pH of the GO dispersion to 8.0 with 0.1 M NaOH, and then add poly The quality of ethyleneimine is 0.2 g of polyethyleneimine solution equal to the volume of GO, ultrasonic for 1 min, and reacted at room temperature for 20 h to obtain graphene oxide / polyethyleneimine composite liquid.

[0026] (2) Preparation of graphene oxide / polyethyleneimine / carboxymethyl cellulose: adding the graphene oxide / polyethyleneimine composite solution to 0.1 g of sodium carboxymethyl cellulose equal to the concentration of GO In the sodium carboxymethyl cellulose solution, stir rapidly for 30 minutes, then slowly add glutaraldehyde dropwise at room temperature at a stirring speed of 800 rpm, after the addition is completed, continue to react for 4 hours at a stirring speed of 600 rpm, finally, wash and dry to obtain a three-...

Embodiment 2

[0029] (1) Preparation of graphene oxide / polyethyleneimine: place 0.2 g of graphite oxide in deionized water to obtain a graphene oxide dispersion by ultrasonication, adjust the pH of the GO dispersion to 8.0 with 0.1 M NaOH, and then add poly The quality of ethyleneimine is 0.4g polyethyleneimine solution equal to the volume of GO, ultrasonic for 1min, and reacted at room temperature for 20h to obtain graphene oxide / polyethyleneimine composite liquid.

[0030] (2) Preparation of graphene oxide / polyethyleneimine / carboxymethyl cellulose: adding the graphene oxide / polyethyleneimine composite solution to 0.1 g of sodium carboxymethyl cellulose equal to the concentration of GO In the sodium carboxymethyl cellulose solution, stir rapidly for 30 minutes, then slowly add glutaraldehyde dropwise at room temperature with a stirring speed of 1000 rpm, after the addition is completed, continue to react for 4 hours at a stirring speed of 500 rpm, finally, wash and dry to obtain a three-dim...

Embodiment 3

[0033] (1) Preparation of graphene oxide / polyethyleneimine: place 0.2 g of graphite oxide in deionized water to obtain a graphene oxide dispersion by ultrasonication, adjust the pH of the GO dispersion to 8.0 with 0.1 M NaOH, and then add poly The quality of ethyleneimine is 0.6 g of polyethyleneimine solution equal to the volume of GO, ultrasonic for 1 min, and reacted at room temperature for 24 h to obtain graphene oxide / polyethyleneimine composite liquid.

[0034] (2) Preparation of graphene oxide / polyethyleneimine / carboxymethyl cellulose: adding the graphene oxide / polyethyleneimine composite solution to 0.1 g of sodium carboxymethyl cellulose equal to the concentration of GO In the sodium carboxymethyl cellulose solution, stir rapidly for 30 minutes, then slowly add glutaraldehyde dropwise at room temperature with a stirring speed of 1000 rpm, after the addition is completed, continue to react for 4 hours at a stirring speed of 500 rpm, finally, wash and dry to obtain a thr...

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Abstract

The invention discloses a preparation method of a three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material. The preparation method comprises the following steps: performing nucleophilic substitution of an amino group on a molecular chain of polyethyleneimine and a carboxyl group and an epoxy group on the surface of graphene oxide to prepare a graphene oxide / polyethyleneimine composite material, and then with glutaraldehyde as a coupling agent, further modifying the graphene oxide / polyethyleneimine by using carboxymethyl cellulose to obtain the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material. Through introduction of the carboxymethyl cellulose, the number of negatively charged oxygen-containing adsorption sites of the material is increased, and a three-dimensional spatial structure is formed, so that the adsorption performance is further improved. Under a weak acid condition, the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material has a very good Pb<2+> adsorbing effect, and the adsorption capacity of the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material is 34.6% higher than that of the graphene oxide / polyethyleneimine, so that the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material can be applied to heavy metal adsorption treatment.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material, belonging to the technical field of material preparation. Background technique [0002] The mining, smelting, and processing of heavy metals cause heavy metals such as lead, mercury, cadmium, and cobalt to enter the atmosphere, water, and soil, causing serious environmental pollution, and heavy metal ions and their compounds are very stable in the environment and have enrichment properties. Its harmfulness cannot be reduced by natural purification. Therefore, how to control heavy metal pollution is an important challenge for industrial development. [0003] Adsorption is the most commonly used method for heavy metal wastewater treatment. Biomaterials are rich in variety, cheap and easy to obtain, and biodegradable. Cellulose, pectin, lignin, and chitosan rich in hydroxyl, carboxyl, and amino groups can phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/24B01J20/261B01J2220/46B01J2220/4806B01J2220/4812B01J2220/4825C02F1/28C02F1/281C02F1/285C02F1/286C02F2101/20
Inventor 林雪梅孟晗
Owner NANJING UNIV OF SCI & TECH
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