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A kind of sodium alginate/carbon quantum dot composite hydrogel material and its preparation method and application

A technology of composite hydrogel and sodium alginate, which is applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve problems such as limited application, achieve simple operation, controllable reaction conditions, and safe effect

Active Publication Date: 2020-12-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the size of carbon quantum dots is less than 10 nm, which limits its application in the field of adsorption

Method used

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  • A kind of sodium alginate/carbon quantum dot composite hydrogel material and its preparation method and application
  • A kind of sodium alginate/carbon quantum dot composite hydrogel material and its preparation method and application
  • A kind of sodium alginate/carbon quantum dot composite hydrogel material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 7mg of carboxymethyl chitosan, 500μL of ethylenediamine, 0.5mL of 1mol / L hydrochloric acid in 10mL of water, put it in a microwave oven and heat it at 300W for 5 minutes, and dissolve the obtained brownish yellow solid in 2mL of water, centrifuge at 8000rpm 10 minutes, lyophilized for 24 hours. The HRTEM results of the resulting carbon quantum dots, such as figure 1 shown.

[0031] Dissolve 1g of sodium alginate powder in 100mL of water and stir vigorously to obtain a sodium alginate solution, add it dropwise to 300mL of 0.01mol / L calcium chloride solution with a syringe to obtain sodium alginate hydrogel balls, gel for 24 hours, filter , wash with water. SEM of sodium alginate hydrogel spheres figure 2 shown.

[0032] Soak 10g of sodium alginate hydrogel balls prepared above in 50mL of 0.5g / L carbon quantum dot solution prepared above for 3 hours, filter, wash with water, and dry at 40°C for 36 hours to obtain The product sodium alginate / carbon quantum d...

Embodiment 2

[0035]Dissolve 9mg carboxymethyl chitosan, 700μL ethylenediamine, 1mL 1mol / L hydrochloric acid in 10mL water, put it in a microwave oven and heat it at 700W power for 3 minutes, and dissolve the obtained brownish yellow solid in 2 mL water, centrifuge at 12000rpm 20 minutes, lyophilized for 36 hours.

[0036] Dissolve 2g of sodium alginate powder in 100mL of water and stir vigorously to obtain sodium alginate solution, add it dropwise to 300mL of 0.1mol / L calcium chloride solution with a syringe to obtain sodium alginate hydrogel balls, gel for 16 hours, filter , wash with water.

[0037] Soak 10g of sodium alginate hydrogel balls prepared above in 50mL 1.5g / L carbon quantum dot solution prepared above for 6 hours, filter, wash with water, and dry at 60°C for 12 hours to obtain The product sodium alginate / carbon quantum dot composite hydrogel material.

[0038] Put 20 mg of the composite material in 10 mL of an aqueous solution of gadolinium ions, and oscillate and adsorb fo...

Embodiment 3

[0040] Dissolve 11mg carboxymethyl chitosan, 1mL ethylenediamine, 1.5mL 1mol / L hydrochloric acid in 10 mL water, put it in a microwave oven and heat it at 900W for 2 minutes, and dissolve the obtained brownish yellow solid in 2mL water, 15000rpm Centrifuge for 30 minutes and lyophilize for 48 hours.

[0041] Dissolve 4g of sodium alginate powder in 100mL of water and stir vigorously to obtain a sodium alginate solution, add it dropwise to 300mL of 1mol / L calcium chloride solution with a syringe to obtain sodium alginate hydrogel balls, gel for 6 hours, filter, Wash with water.

[0042] Soak 10g of sodium alginate hydrogel balls prepared above in 50mL 5g / L carbon quantum dot solution prepared above for 12 hours, filter, wash with water, and dry at 80°C for 6 hours to obtain the product Sodium alginate / carbon quantum dots composite hydrogel material.

[0043] Put 20 mg of the composite material in 10 mL of an aqueous solution of gadolinium ions, and oscillate and adsorb for 18...

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Abstract

The invention relates to a sodium alginate / carbon quantum dot composite hydrogel material, and a preparation method and an application thereof as an adsorbent for adsorbing rare earth element ions inwater. The preparation method comprises the steps: soaking sodium alginate hydrogel spheres in a carbon quantum dot solution for 3-12 h, filtering, washing with water, and drying at the temperature of40-80 DEG C for 6-36 h to obtain the product sodium alginate / carbon quantum dot composite hydrogel material. The mass ratio of the sodium alginate hydrogel spheres to the carbon quantum dots is 4000:(1-20), and the concentration of the carbon quantum dot solution is 0.5-5 g / L. The preparation method is simple, the cost is low, the toxicity is low, and the sodium alginate / quantum dot composite hydrogel material has a good adsorption effect on rare earth element ions.

Description

technical field [0001] The invention relates to a sodium alginate and carbon quantum dot composite hydrogel material and a preparation method thereof, and its application as an adsorbent to absorb rare earth element ions in water. Background technique [0002] Rare earth elements are vital components in modern technology, due to their unique catalytic, optical and magnetic properties, rare earth elements are involved in industries such as batteries, catalysts, permanent magnets and electronics. With the advancement of science and technology, the global demand for rare earth elements is also increasing sharply. However, rare earth mineral resources are non-renewable resources and are unevenly distributed in the world. In addition to considering its industrial impact, its wastewater has potential impacts on the environment and human health due to the toxicity of REEs. Long-term exposure or ingestion of rare earth elements will cause them to accumulate in human organs and adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28C02F1/28B01J20/30
CPCB01J20/20B01J20/24B01J20/28047C02F1/283C02F1/286
Inventor 魏芸郭志伟
Owner BEIJING UNIV OF CHEM TECH