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Chitosan derivative, preparation method and application thereof

A technology of chitosan derivatives and chitosan, which is applied in the direction of analysis by chemical reaction of materials and material analysis by observing the influence on chemical indicators, can solve the problems of cumbersome and time-consuming operation process, etc. Achieve good recognition effect and achieve highly specific effect

Active Publication Date: 2020-12-18
WEST ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the methods for cyanide ion detection include electrochemistry, titration analysis, chromatography and fluorescence spectroscopy, etc. These methods not only rely on precision instruments, but also are cumbersome and time-consuming in the operation process

Method used

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  • Chitosan derivative, preparation method and application thereof
  • Chitosan derivative, preparation method and application thereof
  • Chitosan derivative, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The preparation method step of chitosan derivative that the present invention proposes is as follows:

[0040] S1: Synthesis of 4-(p-nitrobenzene)-azosalicylaldehyde, its synthetic route reference figure 1 ;

[0041] S2: Degradation of chitosan: Dissolve chitosan in acetic acid solution, stir at room temperature for 1 hour to completely dissolve chitosan, adjust pH to 8 with sodium hydroxide solution, obtain flocculent chitosan precipitate, and let the precipitate stand Suction filtration after 1 hour, and repeated washing twice, and drying in a vacuum oven at 40°C for 10 hours to obtain degraded chitosan, which was finely ground for later use;

[0042] S3: Modification of Chitosan:

[0043] (1) Dissolve the degraded chitosan in the S2 in absolute ethanol, stir and swell at room temperature for 20h, and record it as solution A,

[0044] (2) 4-(p-nitrobenzene)-azosalicylaldehyde of the S1 is dissolved in absolute ethanol, and then mixed with solution A, which is recor...

Embodiment 2

[0072] The preparation method step of chitosan derivative that the present invention proposes is as follows:

[0073] S1: Synthesis of 4-(p-nitrobenzene)-azosalicylaldehyde;

[0074] S2: Degradation of chitosan: Dissolve chitosan in acetic acid solution, stir at room temperature for 3 hours to completely dissolve chitosan, adjust pH to 9 with sodium hydroxide solution, obtain flocculent chitosan precipitate, and let the precipitate stand Suction filtration after 3 hours, and repeated washing 4 times, drying in a vacuum oven at 80°C for 14 hours to obtain degraded chitosan, which was finely ground for later use;

[0075] S3: Modification of chitosan:

[0076] (1) Dissolve the degraded chitosan in S2 in absolute ethanol, stir and swell at room temperature for 28h, and record it as solution A,

[0077] (2) 4-(p-nitrobenzene)-azosalicylaldehyde of the S1 is dissolved in absolute ethanol, and then mixed with solution A, which is recorded as solution B,

[0078] (3) Solution B wa...

Embodiment 3

[0091] The preparation method step of chitosan derivative that the present invention proposes is as follows:

[0092] S1: Synthesis of 4-(p-nitrobenzene)-azosalicylaldehyde;

[0093] S2: Degradation of chitosan: Dissolve chitosan in acetic acid solution, stir at room temperature for 2 hours to completely dissolve chitosan, adjust pH to 8.5 with sodium hydroxide solution, obtain flocculent chitosan precipitate, and let the precipitate stand Suction filtration after 2 hours, and repeated washing for 3 times, drying in a vacuum oven at 60°C for 12 hours to obtain degraded chitosan, which was finely ground for later use;

[0094] S3: Modification of chitosan:

[0095] (1) Dissolve the degraded chitosan in S2 in absolute ethanol, stir and swell at room temperature for 24h, and record it as solution A,

[0096] (2) 4-(p-nitrobenzene)-azosalicylaldehyde of the S1 is dissolved in absolute ethanol, and then mixed with solution A, which is recorded as solution B,

[0097] (3) Solutio...

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Abstract

The invention discloses a preparation method of chitosan derivatives, the method steps are as follows: S1: synthesis of 4-(p-nitrobenzene)-azo salicylaldehyde; S2: degradation of chitosan; S3: chitosan Modification: dissolve the degraded chitosan in S2 in absolute ethanol, stir and swell at room temperature for 20-28h, record it as solution A, dissolve the 4-(p-nitrobenzene)-azosalicylaldehyde in S1 in absolute ethanol, then mixed with solution A, and recorded as solution B, and heated and refluxed solution B at 80-85°C for 20-28h. After the reaction, rotary evaporation, concentrated reaction solution, and suction filtration to obtain brown-red solid crude The product, using absolute ethanol as a solvent, washes the red solid product continuously and repeatedly by the Soxhlet extraction method, discards the unreacted azo dye, and dries it in a vacuum oven at 40-80°C for 20-28h to obtain chitosan derivative. The chitosan derivative prepared by the invention has a good recognition effect on anions.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a chitosan derivative, a preparation method and an application thereof. Background technique [0002] At present, the methods for cyanide ion detection include electrochemistry, titration analysis, chromatography and fluorescence spectroscopy, etc. These methods not only rely on precision instruments, but also are cumbersome and time-consuming in the operation process. Contents of the invention [0003] Based on the technical problems existing in the background technology, the present invention proposes a chitosan derivative, a preparation method and an application thereof, which have a good recognition effect on anions. [0004] The preparation method step of chitosan derivative that the present invention proposes is as follows: [0005] S1: Synthesis of 4-(p-nitrobenzene)-azosalicylaldehyde; [0006] S2: Degradation of chitosan: Dissolve chitosan in acetic acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08G01N21/78
CPCC08B37/003G01N21/78
Inventor 聂丽黄磊王军周贤亚
Owner WEST ANHUI UNIV
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