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Foam-like magnetic chitosan adsorbent and preparation method thereof

A chitosan and foam-like technology, which is applied in the field of foam-like magnetic chitosan adsorbent and its preparation, can solve the problems of adsorbent adsorption performance influence, uneven distribution of pores, complicated preparation method, etc., and achieve pore size and distribution The effect of uniformity, uniform hole size, and uniform hole distribution

Active Publication Date: 2018-10-30
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the preparation methods of the existing foamy chitosan-based adsorbents are relatively complicated and cumbersome, and due to the unreasonable selection of raw materials or preparation methods, etc., the pores in the foamy chitosan adsorbents are unevenly distributed and can absorb heavy metals. The poor activity and small amount of the group of the adsorbent will seriously affect the adsorption performance of the adsorbent, and the foamy chitosan-based adsorbent has the disadvantage of being difficult to separate from the solution due to its low density, which severely limits the use of foamy chitosan-based adsorbents. large-scale application of

Method used

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  • Foam-like magnetic chitosan adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Put 1.25g of ferric oxide and 1.8g of chitosan powder in 50mL of deionized water, and disperse evenly to obtain a mixed suspension; add 1.5g of acetic acid and 25g of glycerol in turn to the mixed suspension , dissolved under mechanical stirring to obtain a mixed gel;

[0031] 2. Add 6g of sodium bicarbonate to the mixed suspension and stir. When the volume of the solution expands to 2-3 times, stop stirring to obtain a foamy gel;

[0032] 3. Let the foamy gel stand at 25°C for 1.5 hours, and solidify to obtain a foam material;

[0033] 4. Soak the foam material in 0.1mol / L sulfuric acid solution to remove unreacted sodium bicarbonate until no foam is produced; then soak in 1.0mol / L sodium hydroxide solution for 40min; finally use deionization to repeatedly rinse the foam Square, until becoming neutral, obtains foamy magnetic chitosan adsorbent of the present invention.

Embodiment 2

[0035] 1. Place 0.25g of ferric oxide and 1g of chitosan powder in 50mL of deionized water, and disperse evenly to obtain a mixed suspension; add 0.6g of acetic acid and 10g of glycerol in turn to the mixed suspension, Dissolved under mechanical stirring to obtain a mixed gel;

[0036] 2. Add 2g of sodium bicarbonate to the mixed suspension and stir. When the volume of the solution expands to 2-3 times, stop stirring to obtain a foamy gel;

[0037]3. Let the foamy gel stand at 30°C for 0.5 hours, and solidify to obtain a foam material;

[0038] 4. Soak the foam material in 0.05mol / L sulfuric acid solution to remove unreacted sodium bicarbonate until no foam is generated; then soak in 1.5mol / L sodium hydroxide solution for 30min; finally use deionization to repeatedly rinse the foam Square, until becoming neutral, obtains foamy magnetic chitosan adsorbent of the present invention.

Embodiment 3

[0040] 1. Put 2.5g of ferric oxide and 2.5g of chitosan powder in 50mL of deionized water, and disperse evenly to obtain a mixed suspension; add 2.25g of acetic acid and 37.5g of glycerol to the mixed suspension in turn Alcohol, dissolved under mechanical stirring to obtain a mixed gel;

[0041] 2. Add 10g of sodium bicarbonate to the mixed suspension and stir. When the volume of the solution expands to 2-3 times, stop stirring to obtain a foamy gel;

[0042] 3. Let the foamy gel stand at 25°C for 2 hours, and solidify to obtain a foam material;

[0043] 4. Soak the foam material in 0.2mol / L sulfuric acid solution to remove unreacted sodium bicarbonate until no foam is produced; then soak in 0.5mol / L sodium hydroxide solution for 50min; finally use deionization to repeatedly rinse the foam Square, until becoming neutral, obtains foamy magnetic chitosan adsorbent of the present invention.

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Abstract

The invention discloses a foam-like magnetic chitosan adsorbent and a preparation method thereof. The foam adsorbent is foamed by carbon dioxide produced by the reaction of sodium bicarbonate and acetic acid, and is prepared under the aid and protection of glycerol, the size and distribution of pores in the foam adsorbent are uniform, and more active groups are retained on chitosan. Consequently,the foam-like magnetic chitosan adsorbent has the advantages of having adsorbability to metal ions, and being conducive to large-scale application of the foamed chitosan-based adsorbent in water treatment.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a foamy magnetic chitosan adsorbent and a preparation method thereof. Background technique [0002] With the intensification of heavy metal pollution in water, the research on heavy metal removal technology continues to deepen. The adsorption method is widely used because of its simple operation and high removal efficiency, and is considered to be the most potential treatment method for heavy metal ions. The choice of adsorbent has a decisive effect on the adsorption effect. Biosorbents have been widely concerned by researchers at home and abroad because of their advantages such as wide sources, environmental friendliness, low cost, and the ability to avoid secondary pollution caused by traditional adsorption methods. Among them, chitosan has active groups such as hydroxyl, amino and amido groups that can chelate, adsorb or ion exchange with metal ions, so it has a high removal e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28009B01J20/28045C02F1/286C02F2101/20
Inventor 郭娜彭丽颜子博
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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