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ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material and preparation method thereof

A technology of hydroxide and hybrid materials, applied in chemical instruments and methods, zinc compounds, inorganic chemistry, etc., can solve the problems that the antibacterial activity of hybrid materials cannot be guaranteed, and achieve enhanced antimicrobial activity, good thermal stability, The effect of low viscosity

Pending Publication Date: 2021-06-18
PANZHIHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the currently prepared hybrid materials related to chitosan, the antibacterial activity will also be affected by the pH value and the degree of acetylation of chitosan, and the antibacterial activity of the hybrid materials cannot be guaranteed.

Method used

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  • ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material and preparation method thereof
  • ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material and preparation method thereof
  • ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material and preparation method thereof

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preparation example Construction

[0030] The invention provides a kind of preparation method of ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material, comprises the following steps:

[0031] a. Prepare Zn(NO 3 ) 2 ·6H 2 O solution and Al(NO 3 ) 3 9H 2 O solution, the total concentration of metal ions in it is 0.10-0.22 mol / L, Zn 2+ and Al 3+The molar ratio is 1 / 3~5.0; add urea into the solution and stir evenly to obtain solution A;

[0032] B, the chitosan of low degree of acetylation is dissolved in the lactic acid aqueous solution, prepares biopolymer solution B, adopts sodium hydroxide to regulate the pH value of biopolymer solution to reach 10;

[0033] c. Add solution A to solution B, mix well, react at 60-80°C for 16 hours, and continue to age the obtained precipitate for 3-5 hours, centrifuge repeatedly to obtain a white solid product, wash and dry to obtain ZnAl di Dimensional metal hydroxide-chitosan supramolecular hybrid materials.

[0034] Wherein, in the preparation ...

Embodiment 1

[0046] Embodiment 1 prepares ZnAl-LDH hybrid material

[0047] By mixing different Zn / Al molar ratios (Zn 2+ +Al 3+ =0.10~0.22mol·L -1 ) Zn and Al metal chloride solution to prepare solution A (200ml) and pour the mixed solution into a three-neck round bottom flask, and add urea (B solution is: urea / NO 3- The molar ratio is 4:1).

[0048] Then the A and B solutions were simultaneously added dropwise to 200 mL of deionized water at 60-80 °C under vigorous stirring. The reaction solution was magnetically stirred at 110 °C for 12 h. Filter and wash to neutrality, then dry at 80°C for 24 hours, the obtained sample is a ZnAl-LDH hybrid material.

Embodiment 2

[0049] Embodiment 2 prepares ZnAl two-dimensional metal hydroxide-chitosan hybrid material

[0050] a. Prepare Zn(NO 3 ) 2 ·6H 2 O solution and Al(NO 3 ) 3 9H 2 O solution, add urea to the solution, stir evenly, urea / NO 3- The molar ratio is 4:1.

[0051] B, the chitosan of 0.5g / L low (below 10%) degree of acetylation is dissolved in the lactic acid aqueous solution (2mL) that stirs 30 minutes, prepares biopolymer solution; Add sodium hydroxide in biopolymer solution, Make the pH value reach 10; the addition amount of sodium hydroxide is: CS / NaOH=1:15;

[0052] c, the reaction is carried out under a nitrogen atmosphere to avoid contamination. Pour the solution obtained in step a into a three-necked round bottom flask containing the solution obtained in step b at a rate of 20 mL / h. With stirring (300 rpm) at pH 8.5 at room temperature, 100 ml of the step b solution was added dropwise to the mixed salt solution. After the dropwise addition, the reaction temperature was...

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Abstract

The invention belongs to the technical field of hybrid materials, and particularly relates to a ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material and a preparation method thereof. Aiming at the problem that the antibacterial activity of an existing prepared hybrid material related to chitosan is influenced by the pH value and the acetylation degree of chitosan, the invention provides the preparation method of the hybrid material, and the preparation method comprises the following steps: a, preparing a solution with the total metal ion concentration of 0.10-0.22 mol / L, and adding urea to obtain a solution A; b, preparing a biopolymer solution B; and c, adding the solution A into the solution B, uniformly conducting mixing, conducting reacting at 60-80 DEG C for 16 hours, continuously aging the obtained precipitate for 3-5 hours, and conducting centrifuging, washing and drying to obtain the ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material. The hybrid material prepared by the invention still has antibacterial activity under the conditions that the pH is higher than 5.5, the acetylation degree of chitosan is low and the like, and has important significance.

Description

technical field [0001] The invention belongs to the technical field of hybrid materials, in particular to a ZnAl two-dimensional metal hydroxide-chitosan supramolecular hybrid material and a preparation method thereof. Background technique [0002] Recently, ultrananoscale hybrid materials are an increasingly used approach in the fight against antimicrobial resistance. The construction of organic-inorganic hybrid materials is a rapidly developing field in materials chemistry aimed at producing advanced materials with improved structures and functions. Bio-inorganic hybrids can not only exhibit the properties of different components, but also exhibit further enhanced properties and new synergistic properties due to the interaction between biomolecules and inorganic materials. [0003] Among the raw materials selected to form supramolecular hybrid materials, layered double hydroxides LDH (ZnAl, inorganic) and chitosan (CS, organic) have been studied more, mainly because of ...

Claims

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Application Information

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IPC IPC(8): C08G83/00C01G9/00
CPCC08G83/008C01G9/00C01P2002/82C01P2002/84C01P2002/72C01P2004/03
Inventor 安澜曾虹燕孙厚祥刁毅黄秀丽张毅
Owner PANZHIHUA UNIV
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