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Preparation method and application of modified graphene oxide/chitosan composite material

A composite material and chitosan technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as poor stability, limiting the practical application of chitosan, and loss of specific surface area. The preparation process is simple and easy, the reserves are abundant, and the effect of improving the adsorption performance

Active Publication Date: 2016-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation process, graphene flakes will undergo irreversible restacking, causing them to lose most of their specific surface area, thus limiting the application of graphene as an adsorbent in water pollution control.
Chitosan is cheap and easy to obtain, and its molecular structure contains a large number of amino groups and hydroxyl groups. It is often used as a biosorbent for wastewater treatment. However, chitosan is easily soluble in acidic solutions. The stability is not good, so it also limits the practical application of chitosan in water pollution treatment

Method used

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  • Preparation method and application of modified graphene oxide/chitosan composite material
  • Preparation method and application of modified graphene oxide/chitosan composite material
  • Preparation method and application of modified graphene oxide/chitosan composite material

Examples

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Embodiment 1

[0039] (1) Ultrasonic treatment of the graphite oxide suspension for 2 h to obtain a graphene oxide suspension with a concentration of 2.5 mg / mL;

[0040] The graphite oxide suspension in the present embodiment is prepared by the improved Hummers method, and the specific steps are: 120ml of concentrated sulfuric acid is added to a 1L beaker and placed in an ice-water bath, and it is slowly stirred with an electric stirrer, and when its temperature drops to 4 At about ℃, add 5g of graphite and 2.5g of sodium nitrate, continue to stir for 1 hour, then slowly add 15g of potassium permanganate, keep the temperature of the reaction system not higher than 10℃ in the process, and continue to react for 3h; move the beaker to a constant temperature of 35℃ In the water bath, when the temperature of the system rises to 35°C, continue to stir and react for 15 hours; add 230ml of deionized water to the beaker continuously and slowly, control the temperature of the system below 98°C, heat th...

Embodiment 2

[0050] (1) Ultrasonic treatment of the graphite oxide suspension for 2 h to obtain a graphene oxide suspension with a concentration of 2.5 mg / mL;

[0051] (2) stirring the disodium edetate solution into the graphene oxide suspension obtained in step (1), stirring and mixing;

[0052] The preparation method of the mixed solution in this embodiment is: weigh 5g of disodium edetate crystals in a 250ml beaker, add 250ml of deionized water to dissolve it, stir and add it to the graphene oxide suspension in step (1) , continuous electric stirring for 4h;

[0053] (3) dissolving chitosan in glacial acetic acid, stirring and adding in the mixed solution of step (2) after fully dissolving, continuing to stir after ultrasonic stirring to obtain a uniform and stable suspension;

[0054] The preparation method of the suspension in this embodiment is: take 5g chitosan and place it in 100mL2% glacial acetic acid, stir it with a glass plate to make it fully dissolve, then stir and add it to...

Embodiment 3

[0059] (1) Ultrasonic treatment of the graphite oxide suspension for 2 h to obtain a graphene oxide suspension with a concentration of 2.5 mg / mL;

[0060] (2) stirring the disodium edetate solution into the graphene oxide suspension obtained in step (1), stirring and mixing;

[0061] The preparation method of the mixed solution in this embodiment is: weigh 2.5g disodium edetate crystals in a 250ml beaker, add 250ml deionized water to dissolve it, stir and add the graphene oxide suspension in step (1) In the middle, continue electric stirring for 4h;

[0062] (3) dissolving chitosan in glacial acetic acid, stirring and adding in the mixed solution of step (2) after fully dissolving, and continuing to stir after ultrasonic stirring for a period of time to obtain a uniform and stable suspension;

[0063] The preparation method of the suspension in this embodiment is: take 5g chitosan and place it in 100mL2% glacial acetic acid, stir it with a glass plate to make it fully dissolv...

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Abstract

The invention discloses a preparation method and application of a modified graphene oxide / chitosan composite material. The modified graphene oxide / chitosan composite material is prepared from the following components of graphene oxide, chitosan and disodium edentate. The preparation method comprises the steps of adding the water-soluble disodium edentate in graphene oxide suspension liquid which is obtained after carrying out ultrasonic treatment in a stirring way, and uniformly mixing the mixture; then adding a chitosan solution which is dissolved in glacial acetic acid in the stirring way; carrying out suction filtration, centrifugation, vacuum drying and grinding / sieving after carrying out ultrasonic stirring for a certain time, thus obtaining the modified graphene oxide / chitosan composite material. The modified graphene oxide / chitosan composite material prepared by the method can be used as an adsorbent to be used in the field of water pollution control and to be particularly used for adsorbing and removing heavy metal pollutants in wastewater, and has the advantages that the preparation method is simple, the adsorption speed is fast, the regeneration performance is good, and the like; the sources of needed raw materials are wide, the cost is low, and the actual application value is high.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a preparation method and application of a modified graphene oxide / chitosan composite material. Background technique [0002] With the rapid development of human society and industrial economy on a global scale, especially in developing countries, the resulting environmental problems have brought great risks and threats to human health and the public environment, among which heavy metal pollution in water cannot be underestimated. As a developing country, China has a large number of industrial manufacturing industries, and the environmental problems caused by them are constantly emerging. Among them, hexavalent chromium, which is widely used in industries such as metal processing, tanning, electroplating, and pigment manufacturing, is a common carcinogenic heavy metal pollutant in industrial wastewater, which has high toxicity, refractory degradation, and enrichmen...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/62
CPCB01J20/20B01J20/223B01J20/24B01J2220/46C02F1/288
Inventor 罗汉金张丽
Owner SOUTH CHINA UNIV OF TECH
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