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A kind of preparation method of heavy metal ion adsorbent

A technology for heavy metal ions and adsorbents, applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc. And other issues

Active Publication Date: 2018-08-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, there is no relevant report on graphene-montmorillonite-chitosan composite gel as a heavy metal ion adsorbent in the prior art

Method used

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  • A kind of preparation method of heavy metal ion adsorbent
  • A kind of preparation method of heavy metal ion adsorbent
  • A kind of preparation method of heavy metal ion adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of GO suspension: Dissolve 1gGO in 100mL distilled water, and sonicate for 30min at a frequency of 600w;

[0050] (2) Preparation of GO-MT mixed suspension: Weigh 0.05g of MT powder and add it to 10mL of the above-prepared GO suspension, 500r / min magnetic stirring for 10min, and 600w ultrasonication for 30min to obtain a GO-MT uniform mixed suspension;

[0051] (3) Prepare GO-MT-CS mixed liquid: add 0.2mL acetic acid to MT-GO mixed suspension, then add 0.2g CS powder, and stir magnetically at 500r / min for 2h to obtain a uniform viscous liquid;

[0052] (4) Formation of G-MT-CS hydrogel: Add 0.5g VC to the liquid obtained in (3) above, stir magnetically at 500r / min for 10min, so that VC is fully dispersed in the mixture, and then place it at 50 Reduction reaction in an oven at ℃ for 12 hours to obtain G-MT-CS hydrogel;

[0053] (5) Preparation of G-MT-CS airgel: freeze-dry the G-MT-CS hydrogel at -50°C and a vacuum of 15Pa to obtain G-MT-CS airgel .

...

Embodiment 2

[0060] (1) Prepare GO suspension: Dissolve 1gGO in 100mL distilled water, and ultrasonicate at 600w for 30min;

[0061] (2) Preparation of GO-MT mixed suspension: Weigh 0.1gMT powder into 10mL of the above-prepared GO suspension, 500r / min magnetic stirring for 10min, 600w ultrasonication for 30min to obtain GO-MT uniform mixed suspension;

[0062] (3) Preparation of GO-MT-CS mixture: add 0.2 mL of acetic acid to the MT-GO suspension, then add 0.2 g of CS powder, and stir magnetically at 500 r / min for 2 h. Obtain a uniform viscous liquid;

[0063] (4) Formation of G-MT-CS hydrogel: Add 0.5g VC to the liquid obtained in (3) above, stir magnetically at 500r / min for 10min, so that VC is fully dispersed in the mixture, and then place it at 50 The G-MT-CS hydrogel was obtained in an oven at ℃ for 12 hours;

[0064] (5) Preparation of G-MT-CS airgel: freeze-dry the G-MT-CS hydrogel at -50°C and a vacuum of 15Pa to obtain G-MT-CS airgel .

Embodiment 3

[0066] (1) Prepare GO suspension: Dissolve 1gGO in 100mL distilled water, and ultrasonicate at 600w for 30min;

[0067] (2) Preparation of GO-MT mixed suspension: Weigh 0.2g of MT powder into 10mL of the GO suspension prepared above, stir magnetically at 500r / min for 10min, then ultrasonicate at 600w for 30min to obtain a uniform mixed suspension of GO-MT;

[0068] (3) Prepare the GO-MT-CS mixture: add 0.2mL acetic acid to the MT-GO suspension, then add 0.2gCS powder, and stir magnetically at 500r / min for 2h to obtain a uniform viscous liquid;

[0069] (4) Formation of G-MT-CS hydrogel: Add 0.5g VC to the mixed solution obtained in (3) above, stir magnetically at 500r / min for 10min, so that VC is fully dispersed in the mixed solution, and then place it in G-MT-CS hydrogel was obtained in an oven at 50°C for 12 hours;

[0070] (5) Preparation of G-MT-CS airgel: freeze-dry the G-MT-CS hydrogel at -50°C and a vacuum of 15Pa to obtain G-MT-CS airgel .

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Abstract

The invention relates to a preparation method of heavy metal ion adsorbent (graphene-montmorillonite-chitosan composite gel), and belongs to the field of functional composite materials. The preparation method of the heavy metal ion adsorbent comprises the following steps that 1, montmorillonite powder and graphene oxide suspension liquid are stirred and mixed to be uniform to obtain graphene oxide-montmorillonite mixed suspension liquid; 2, graphene oxide-montmorillonite-chitosan mixed suspension liquid is prepared; 3, a reducing agent is added into the graphene oxide-montmorillonite-chitosan mixed suspension liquid, a reduction reaction is conducted by heating, and the graphene-montmorillonite-chitosan hydrogel is prepared. The graphene-montmorillonite-chitosan (G-MT-CS) gel prepared through the method has an excellent adsorption function and also has a structure and a compression recovery property which are similar to those of a sponge, and therefore the gel cannot be destroyed by stirring vibration in the adsorption process.

Description

technical field [0001] The invention relates to a preparation method of a heavy metal ion adsorbent (graphene-montmorillonite-chitosan composite gel), belonging to the field of functional composite materials. Background technique [0002] Chitosan (CS), a natural polymer that exists in abundance in nature, has a wide range of sources. It is a natural polymer that is second only to cellulose in nature, and is also a rare positively charged polymer in natural polysaccharides. , there are a large number of hydroxyl groups and amino groups in its molecular chain, and the same molecular chain as cellulose contains a large number of hydrogen bonds, but it will dissolve under acidic conditions, so researchers will use acetic acid when using chitosan. Dissolving, and further follow-up work. Due to the effect of hydroxyl and amino groups on its molecular chain, chitosan itself is a good adsorbent for heavy metal ions. Amino groups and hydroxyl groups can form chelates with heavy met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/12B01J20/20B01J20/24B01J20/28047C02F1/288C02F2101/20C02F2101/22
Inventor 杨伟喻鹏王捍卿包睿莹谢邦互杨鸣波
Owner SICHUAN UNIV
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