Preparation of magnetic chitosan semi-interpenetrating thermal expansion hydrogel and application of magnetic chitosan semi-interpenetrating thermal expansion hydrogel in Cr (VI) adsorption

A technology of chitosan and hydrogel, which is applied in the field of wastewater treatment and material synthesis research, can solve the problems of high cost, low adsorption capacity, insufficient mechanical strength, etc., and achieve the effect of low cost and improved adsorption efficiency

Active Publication Date: 2020-04-17
GUIZHOU EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more and more mature studies are based on N -Isopropylacrylamide heat-shrinkable temperature-sensitive hydrogel, its remarkably reversible discontinuous volume phase transition endows the hydrogel with broad application prospects, but because of its high cost, slow response rate of heat-shrinkable type, adsorption Defects such as low capacity and insufficient mechanical strength cannot meet the needs of practical applications in most cases

Method used

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  • Preparation of magnetic chitosan semi-interpenetrating thermal expansion hydrogel and application of magnetic chitosan semi-interpenetrating thermal expansion hydrogel in Cr (VI) adsorption
  • Preparation of magnetic chitosan semi-interpenetrating thermal expansion hydrogel and application of magnetic chitosan semi-interpenetrating thermal expansion hydrogel in Cr (VI) adsorption
  • Preparation of magnetic chitosan semi-interpenetrating thermal expansion hydrogel and application of magnetic chitosan semi-interpenetrating thermal expansion hydrogel in Cr (VI) adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of magnetic chitosan semi-interpenetrating heat-expandable hydrogel, comprising the following steps:

[0028] (1) Weigh 3.2g of acetic acid and 1.4g of chitosan at room temperature and dissolve in 60.0g of distilled water. Under stirring, add 18.0g of acrylamide monomer to dissolve completely, and slowly add 16.0g of acrylamide under strong stirring. After the temperature-sensitive macromer is completely dissolved, nitrogen gas was introduced for 30 minutes, and then 0.2 g of N,N-methylenebisacrylamide and 0.1 g of 2-ketoglutaric acid were added in sequence, and nitrogen gas was continued for 30 minutes, sealed, and the In situ free radical polymerization was initiated by 365 nm ultraviolet light irradiation for 6 h, and a transparent elastic hydrogel was obtained.

[0029] (2) Cutting the transparent elastic hydrogel obtained above into pieces, and freeze-drying at low temperature to obtain chitosan semi-interpenetrating heat-expandable hydrogel. ...

Embodiment 2

[0032] A preparation method of magnetic chitosan semi-interpenetrating heat-expandable hydrogel, comprising the following steps:

[0033] (1) Weigh 3.2g of acetic acid and 2.8g of chitosan at room temperature and dissolve in 60g of distilled water. Under stirring, add 18.0g of acrylamide monomer and stir to dissolve completely, and slowly add 16.0g of warm After the sensitive macromolecules are completely dissolved, nitrogen gas was introduced for 30 minutes, and then 0.2 g of N,N-methylenebisacrylamide and 0.1 g of 2-ketoglutaric acid were added in sequence, and nitrogen gas was continued for 30 min. In situ free radical polymerization was initiated by 365 nm ultraviolet light irradiation for 6 h, and a transparent elastic hydrogel was obtained.

[0034] (2) Cutting the transparent elastic hydrogel obtained above into pieces, and freeze-drying at low temperature to obtain chitosan semi-interpenetrating heat-expandable hydrogel.

[0035] (3) Put the obtained chitosan semi-int...

Embodiment 3

[0037] A preparation method of magnetic chitosan semi-interpenetrating heat-expandable hydrogel, comprising the following steps:

[0038](1) Dissolve 3.2g of acetic acid and 1.4g of chitosan at room temperature in 60g of distilled water, add 16.0g of acrylamide monomer under stirring to dissolve completely, and slowly add 34g of temperature-sensitive After the macromonomer is completely dissolved, nitrogen gas is introduced for 30 minutes, and then 0.2 g of N,N-methylenebisacrylamide and 0.1 g of 2-ketoglutaric acid are added in sequence, and nitrogen gas is continued for 30 min. In situ radical polymerization was induced by 365 nm ultraviolet light irradiation for 6 h, and a transparent elastic hydrogel was obtained.

[0039] (2) Cutting the transparent elastic hydrogel obtained above into pieces, and freeze-drying at low temperature to obtain chitosan semi-interpenetrating heat-expandable hydrogel.

[0040] (3) Put the obtained chitosan semi-interpenetrating thermal expansi...

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Abstract

The invention discloses a preparation method of a magnetic chitosan semi-interpenetrating thermal expansion hydrogel and application of the magnetic chitosan semi-interpenetrating thermal expansion hydrogel in adsorption on Cr (VI). According to the preparation method, the adsorption efficiency and the adsorption capacity of the gel on Cr (VI) are improved by utilizing the thermal expansion performance of the hydrogel and active groups such as-OH and-NH2 rich in chitosan; the mechanical strength of the hydrogel is improved through a semi-interpenetrating network technology; the hydrogel has good magnetism and can be separated from water under the condition of an external magnetic field, and the solid-liquid separation effect is achieved. When the magnetic chitosan semi-interpenetrating thermal expansion hydrogel is applied in adsorption on Cr (VI), because of temperature-sensitive hydrogel thermal expansion performance and a large amount of -OH,-NH2 and other active groups contained byinterpenetrating chain chitosan, the adsorption efficiency and adsorption capacity of the hydrogel on Cr (VI) can be improved.

Description

technical field [0001] The invention belongs to the research field of waste water treatment and material synthesis, and in particular relates to the preparation of a magnetic chitosan semi-interpenetrating heat-expandable hydrogel and its application to the adsorption of Cr(VI). Background technique [0002] With the rapid development of global industrialization, heavy metal pollution poses a serious threat to human health and the environment. Among them, Cr(VI) is considered a carcinogen by the International Agency for Research on Cancer because of its mutagenic and teratogenic properties. Cr(VI) is a heavy metal ion that exists in large quantities in wastewater from electroplating, dyestuff, leather, textile and other industries. It is highly toxic and carcinogenic, and difficult to biodegrade, seriously endangering the ecological environment and human health. [0003] The current methods for removing Cr(VI) include chemical precipitation, electrochemical method, ion exch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28B01J20/30C08F265/10C08F220/56C08F222/38C08F2/48C02F101/22
CPCB01J20/24B01J20/267B01J20/06C08F265/10C08F2/48B01J20/28009B01J20/28047C02F1/286C02F1/285C02F1/281C02F2101/22B01J2220/46C08F220/56C08F222/385Y02W10/37
Inventor 王毓赵君任俊鹏夏卉芳
Owner GUIZHOU EDUCATION UNIV
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