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
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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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