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Chitosan/nano-metal composite hydrogel as well as preparation method and application thereof

A composite hydrogel and nano-metal technology, which is applied in the field of chitosan/nano-metal composite hydrogel and its preparation, can solve the problems of low dispersion and poor load stability, and achieve simple process, convenient operation and low cost. cheap effect

Active Publication Date: 2020-09-04
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although there have been studies on the use of hydrogel, graphene, and silica microspheres as carriers to load metal nanoparticles, the current loading methods are more or less poor in loading stability and low in dispersibility. defect

Method used

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  • Chitosan/nano-metal composite hydrogel as well as preparation method and application thereof
  • Chitosan/nano-metal composite hydrogel as well as preparation method and application thereof
  • Chitosan/nano-metal composite hydrogel as well as preparation method and application thereof

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Embodiment 1

[0045] The steps of the preparation method of the present invention are as follows:

[0046] (1) choosing deacetylation degree is 50% chitosan as raw material;

[0047] (2) 0.1wt% chitosan, mercaptoacid or thioether acid 0.1wt% and the rest of the water are mixed;

[0048] (3) placing the mixture at 20° C. for 8 h to obtain a homogeneous chitosan solution;

[0049] (4) After the homogeneous chitosan solution is centrifuged and defoamed, drop ethanol in a volume ratio of 1:5 to form a spherical chitosan gel;

[0050] (5) Place the spherical chitosan gel in a solution containing the target metal ion, the metal ion concentration is 0.01 mg / mL, shake at room temperature for 48 hours, and absorb the target metal ion;

[0051] (6) Place the gel adsorbed with the target metal ion in a volume ratio of 1:10 in a sodium borohydride solution with a concentration of 0.01 mol / L and shake at room temperature for 48 hours to obtain a chitosan / nano-metal composite hydrogel.

Embodiment 2

[0053] The steps of the preparation method of the present invention are as follows:

[0054](1) choosing deacetylation degree is 100% chitosan as raw material;

[0055] (2) 10wt% chitosan, mercapto acid or 30wt% thioether acid and the remainder of water are mixed;

[0056] (3) placing the mixture at 80° C. for 1 h to obtain a homogeneous chitosan solution;

[0057] (4) After the homogeneous chitosan solution is centrifuged and degassed, it is dripped with ethanol at a volume ratio of 1:10 to form a spherical chitosan gel;

[0058] (5) Place the spherical chitosan gel in a solution containing the target metal ion, the metal ion concentration is 100 mg / mL, shake at room temperature for 1 hour, and absorb the target metal ion;

[0059] (6) Place the gel adsorbed with the target metal ion at a volume ratio of 1:100 in a sodium borohydride solution with a concentration of 10 mol / L and shake at room temperature for 1 h to obtain a chitosan / nano-metal composite hydrogel.

Embodiment 3

[0061] According to the steps of Example 1, weigh 1.25 grams of crab shell chitosan, 0.394 grams of 3-mercaptopropionic acid, 0.279 grams of thiomalic acid and 20 mL of deionized water, and add them together to a round bottom flask at a temperature of 80 ° C. Mechanically stirred for 6h to obtain a homogeneous solution of chitosan. The chitosan solution was subjected to centrifugal defoaming at a speed of 10,000 rpm, and the chitosan solution was dropped dropwise into 3 times the amount of absolute ethanol using a disposable syringe to form chitosan gel beads with a diameter of 3 mm. The hydrogel beads were soaked in absolute ethanol for 2 h to age. Transfer 300 chitosan gel beads to 50mL, 1.5mM sodium chloraurate aqueous solution and shake at 25°C for 24h, then transfer the chitosan gel column to 30mL, 0.1M sodium borohydride aqueous solution in Keep shaking at 25° C. for 2 hours to reduce the loaded Au(III) to nano-gold to obtain chitosan / nano-gold composite hydrogel.

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Abstract

The invention discloses chitosan / nano-metal composite hydrogel as well as a preparation method and application thereof. Chitosan hydrogel containing sulfydryl or thioether is used as a matrix, and metal nanoparticles with the particle size of 0.1-100nm are uniformly dispersed in the matrix. The composite hydrogel can be used in the fields of catalysis, water treatment, pharmacy and antibiosis. Thecomposite hydrogel disclosed by the invention has the characteristics of good metal nanoparticle loading stability, high dispersity, simple preparation process, convenience in operation, low cost andwide application range.

Description

technical field [0001] The invention relates to a hydrogel and its preparation method and application, in particular to a chitosan / nano metal composite hydrogel and its preparation method and application. Background technique [0002] Polymer hydrogel is a material with a three-dimensional network structure. Two conditions must be met for a polymer to become a hydrogel material: a large number of hydrophilic groups on the main chain or side chain of the polymer and an appropriate cross-linked network structure. The starting materials for the preparation of polymer hydrogels can be monomers (water-soluble or oil-soluble monomers), polymers (natural or synthetic polymers) or a mixture of monomers and polymers (Functional Materials, 2003 (4 ):382-385). Hydrogels can produce very obvious swelling behavior in water, and can maintain a certain shape without dissolution. The water absorption and water retention capabilities of hydrogels usually depend on the three-dimensional ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28B01J31/06B01J37/16C07C213/02C07C215/76C02F101/20
CPCB01J20/24B01J20/28047C02F1/286B01J31/06B01J37/16C07C213/02C02F2101/20B01J2231/641B01J35/23B01J35/40C07C215/76
Inventor 张丽华谢海波黄富荣
Owner GUIZHOU UNIV
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