Preparation of a magnetic chitosan semi-interpenetrating heat-expandable hydrogel and its application in cr(vi) adsorption

A technology of hydrogel and chitosan, which is applied in the field of wastewater treatment and material synthesis research, can solve the problems of high cost, low adsorption capacity, and failure to meet the needs of practical applications, and achieve the effect of low cost and improved adsorption efficiency

Active Publication Date: 2022-07-08
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 a magnetic chitosan semi-interpenetrating heat-expandable hydrogel and its application in cr(vi) adsorption
  • Preparation of a magnetic chitosan semi-interpenetrating heat-expandable hydrogel and its application in cr(vi) adsorption
  • Preparation of a magnetic chitosan semi-interpenetrating heat-expandable hydrogel and its application in cr(vi) adsorption

Examples

Experimental program
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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 and stir to dissolve completely, and slowly add 16.0g under vigorous stirring. After the temperature-sensitive macromonomer was completely dissolved, nitrogen was introduced for 30 minutes, 0.2 g of N,N-methylenebisacrylamide and 0.1 g of 2-ketoglutaric acid were added in sequence, and nitrogen was continued for 30 minutes. In situ radical polymerization was initiated by irradiation with UV light at 365 nm for 6 h to obtain a transparent elastic hydrogel.

[0029] (2) The transparent elastic hydrogel obtained above is cut into pieces, and freeze-dried at low temperature to obtain a chitosan semi-interpenetrating heat-expandable hydrogel.

[0030] (3) The obtained chitosan semi-inter...

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 it 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 water under vigorous stirring. After the sensitive macromonomer was completely dissolved, nitrogen was introduced for 30 min, 0.2 g of N,N-methylenebisacrylamide and 0.1 g of 2-ketoglutaric acid were added in sequence, and nitrogen was continued for 30 min. In situ radical polymerization was initiated by irradiation with UV light at 365 nm for 6 h to obtain a transparent elastic hydrogel.

[0034] (2) The transparent elastic hydrogel obtained above is cut into pieces, and freeze-dried at low temperature to obtain a chitosan semi-interpenetrating heat-expandable hydrogel.

[0035] (3) The obtained chitosan semi-interpenet...

Embodiment 3

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

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

[0039] (2) The transparent elastic hydrogel obtained above is cut into pieces, and freeze-dried at low temperature to obtain a chitosan semi-interpenetrating heat-expandable hydrogel.

[0040] (3) The obtained chitosan semi-interp...

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Abstract

The invention discloses a preparation method of a magnetic chitosan semi-interpenetrating thermal expansion hydrogel and its application to the adsorption of Cr(VI). Contains ‑OH and ‑NH 2 Isoactive groups improve the adsorption efficiency and adsorption capacity of the gel for Cr(VI); the mechanical strength of the hydrogel is improved by the semi-interpenetrating network technology; the hydrogel has good magnetic properties, and can be combined with the hydrogel under the condition of an external magnetic field. Water separation to achieve solid-liquid separation effect. When the present invention is applied to the adsorption of Cr(VI), the thermal expansion performance of the thermosensitive hydrogel and the interspersed chain chitosan contain a large amount of ‑OH and ‑NH 2 and other active groups, which can improve the adsorption efficiency and adsorption capacity of hydrogels for Cr(VI).

Description

technical field [0001] The invention belongs to the research field of wastewater treatment and material synthesis, and in particular relates to the preparation of a magnetic chitosan semi-interpenetrating thermally-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 the wastewater of electroplating, dyes, leather, textile and other industries. It has strong toxicity and carcinogenicity, and is difficult to biodegrade, seriously endangering the ecological environment and human health. [0003] At present, the methods of removing Cr(VI) include chemical precipitation method, electroche...

Claims

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Application Information

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Patent Type & Authority Patents(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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