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Thiosemicarbazide functionalized graphene oxide/chitosan composite adsorbent as well as preparation method and application thereof

A technology of thiosemicarbazide and composite adsorption, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as weak bonding, complicated preparation steps, and material loss, and achieve good and reproducible properties, the preparation method is simple, and the effect of increasing the adsorption capacity

Active Publication Date: 2021-07-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of the adsorbent requires ultra-low temperature freeze-drying and takes a long time, consumes a lot of energy, has many steps in the preparation process, and has a low adsorption capacity for heavy metals.
Patent CN105498707B uses disodium edetate, graphene oxide, and chitosan to prepare an adsorption material. However, the material adopts a physical blending method, and the combination between substances may not be firm, causing material loss during the adsorption process.
Patent CN109999909A, prepared a chitosan / diatomaceous earth / graphene oxide composite material, but the preparation process of this material also requires lower and higher temperatures, and the preparation process steps are more complicated

Method used

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  • Thiosemicarbazide functionalized graphene oxide/chitosan composite adsorbent as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation steps of the provided thiosemicarbazide functionalized graphene oxide / chitosan composite adsorbent are as follows:

[0046] (1) 0.5g of chitosan was added to a 250mL single-necked flask, and 100mL of 1% acetic acid solution was added to make it a pale yellow viscous mixture.

[0047] (2) Disperse 100 mg of graphene oxide into 20 mL of distilled water, and then add the graphene oxide dispersion into the mixture described in step (1).

[0048] (3) Add 100 mg of thiosemicarbazide solid directly into the dispersion system described in step (2), and stir at 30° C. for 30 minutes to disperse the components evenly.

[0049] (4) Add 1 mL of glutaraldehyde to the dispersion system described in step (3), and stir at 40° C. for 2 h.

[0050] (5) Add the mixture obtained in step (4) to 100mL 0.5mol / L NaOH solution, use a 50mL centrifuge tube, centrifuge at 10000rpm for 1min, wash the obtained precipitate with distilled water, repeat the washing-centrifugation cycle 3...

Embodiment 2

[0053] The preparation steps of the provided thiosemicarbazide functionalized graphene oxide / chitosan composite adsorbent are as follows:

[0054] (1) 1.0g of chitosan was added to a 250mL single-necked flask, and 100mL of 1% acetic acid solution was added to make it a pale yellow viscous mixture.

[0055] (2) Disperse 100 mg of graphene oxide into 20 mL of distilled water, and then add the graphene oxide dispersion into the mixture described in step (1).

[0056] (3) Add 200 mg of thiosemicarbazide solid directly into the dispersion system described in step (2), and stir at 30° C. for 30 minutes to disperse the components evenly.

[0057] (4) Add 1 mL of glutaraldehyde to the dispersion system described in step (3), and stir at 40° C. for 2 h.

[0058] (5) Add the mixture obtained in step (4) to 70mL 0.5mol / L NaOH solution, use a 50mL centrifuge tube, centrifuge at 8000rpm for 2min, wash the obtained precipitate with distilled water, repeat the washing-centrifugation cycle 3...

Embodiment 3

[0061] The preparation steps of the provided thiosemicarbazide functionalized graphene oxide / chitosan composite adsorbent are as follows:

[0062] (1) 1.5g of chitosan was added to a 250mL single-necked flask, and 70mL of 2% acetic acid solution was added to make it a pale yellow viscous mixture.

[0063] (2) Disperse 100 mg of graphene oxide into 10 mL of distilled water, then add the graphene oxide dispersion into the mixture described in step (1).

[0064] (3) Add 200 mg of thiosemicarbazide solid directly into the dispersion system described in step (2), and stir at 30° C. for 30 minutes to disperse the components evenly.

[0065] (4) Add 1 mL of glutaraldehyde to the dispersion system described in step (3), and stir at 40° C. for 2 h.

[0066] (5) Add the mixture obtained in step (4) to 120mL 0.5mol / L NaOH solution, use a 50mL centrifuge tube, centrifuge at 8000rpm for 1min, wash the obtained precipitate with distilled water, repeat the washing-centrifugation cycle 3 tim...

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Abstract

The invention discloses a thiosemicarbazide functionalized graphene oxide / chitosan composite adsorbent as well as a preparation method and application thereof. The method comprises the following steps: dispersing chitosan in an acetic acid solution; dispersing the graphene oxide in water, and then adding the obtained dispersion into the chitosan dispersion liquid; adding thiosemicarbazide into the dispersion liquid, performing stirring treatment, then adding glutaraldehyde into the dispersion liquid, and reacting under stirring; and adding the mixed solution into a NaOH solution while stirring, centrifuging, washing and drying to obtain the adsorbent. The functionalized graphene oxide / chitosan composite adsorbent provided by the invention has the characteristics of simplicity in preparation, high yield, adsorption selectivity to Hg<2+>, easiness in separation and recovery and the like. The modified graphene oxide / chitosan composite adsorbent can effectively adsorb and remove heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of heavy metal sewage treatment, and in particular relates to a thiosemicarbazide functionalized graphene oxide / chitosan composite adsorbent and a preparation method and application thereof. Background technique [0002] With the rapid development of industrialization and the continuous improvement of social production level, a large number of heavy metal ions are discharged into the water environment system along with the sewage. Due to the high toxicity, bioaccumulation, carcinogenicity and non-degradability of heavy metal ions, heavy metal pollution has become an urgent social problem that hinders the sustainable development of human beings and endangers human health and ecosystems. In recent years, a variety of heavy metal ion treatment technologies have been widely used, including membrane separation technology, chemical precipitation, ion exchange, reverse osmosis and adsorption. Among them, the adsor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/20C02F1/28C02F101/20
CPCB01J20/20B01J20/24B01J20/28011B01J20/3085C02F1/281C02F1/286B01J2220/46C02F2101/20
Inventor 葛华才武文鹏
Owner SOUTH CHINA UNIV OF TECH
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