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Preparation method, using method for modified chitosan and application thereof

A chitosan, modified technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as limiting the scope of application, and achieve the effect of good effect and low cost

Inactive Publication Date: 2012-03-07
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the chitosan molecular chain contains reactive groups -NH 2 , -OH, shows good flocculation performance and complexation, which enables it to produce complexation with transition metal ions, humic acid substances and surfactants in water, and can realize the removal of water-soluble organic pollutants However, chitosan is insoluble in water, alkali (pH>6.5) and general organic solvents, and can only be dissolved in some organic acids, such as formic acid, acetic acid, tartaric acid and citric acid, thus limiting its application range

Method used

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  • Preparation method, using method for modified chitosan and application thereof
  • Preparation method, using method for modified chitosan and application thereof
  • Preparation method, using method for modified chitosan and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] At room temperature, chitosan was added to pH = 8.0 disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution, swelled for 3 hours, then 1, 5 glutaraldehyde with a weight concentration of 25% was added, and the reaction was stirred for 2 hours. , at 60° C., vacuum-dried to constant weight, chitosan: buffer: concentration of 25% 1,5 glutaraldehyde=1 gram: 9 milliliters: 1.2 milliliters.

[0033] The infrared chromatogram of the modified chitosan that embodiment 1 makes is as figure 1 Shown:

[0034] figure 2 Infrared spectrum of CTS, 3200~3500cm -1 The broad peak at the position is a multiple absorption peak formed by the overlapping of the O-H stretching vibration absorption peak and the N-H stretching vibration absorption peak. Compared with the hydroxyl and amino groups on the residual sugar group, this broad peak also shows that these hydroxyl and amino groups are different in strength Intramolecular and intermolecular hydrogen bonds. At 1030cm -1 ...

Embodiment 2

[0036] At room temperature, chitosan was added to pH = 8.5 disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution, swelled for 3.5 hours, then 1, 5 glutaraldehyde with a weight concentration of 25% was added, and the reaction was stirred for 2 hours. , at 60° C., vacuum-dried to constant weight, chitosan: buffer solution: concentration of 25% 1,5 glutaraldehyde=1 gram: 8 milliliters: 0.6 milliliters.

Embodiment 3

[0038] At room temperature, chitosan was added to pH = 9.0 disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution, swelled for 4 hours, then 1, 5 glutaraldehyde with a weight concentration of 25% was added, and the reaction was stirred for 4 hours. , at 80° C., vacuum-dried to constant weight, chitosan: buffer: concentration of 25% 1,5 glutaraldehyde=1 gram: 10 milliliters: 1.2 milliliters.

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Abstract

The invention discloses a preparation method and a using method for modified chitosan and application thereof. The preparation method comprises the following steps: adding chitosan into buffer solution with pH of between 8.0 and 9.0 at room temperature; after swelling time is greater than or equal to 3 hours, adding 25 percent of 1,5-glutaraldehyde into the buffer solution to react for 2 to 4 hours by stirring; and drying the reactant in vacuum at the temperature of between 60 and 80 DEG C to constant weight. The ratio of the chitosan to the buffer solution to the 25 percent 1,5-glutaraldehyde is 1 gram: 8 to 10 milliliters: 0.6 to 1.2 milliliters. Compared with the prior art, the method improves the adsorption performance of the chitosan on the phenol and dichlorophenol by 10 times through chemical modification. The method has easy operation, low cost and good effect, and can be repeatedly used, so the method has practical value in application of wastewater treatment.

Description

technical field [0001] The invention belongs to the preparation method, use method and application thereof of an adsorbent, in particular to the preparation method, use method and application thereof of modified chitosan. Background technique [0002] Chitosan (CTS) is a non-toxic and tasteless linear semi-rigid biomacromolecule obtained by a series of treatments from shrimp and crab shells. It is called poly(1,4)-2-amino-2-deoxy-D-glucose. Since the chitosan molecular chain contains reactive groups -NH 2 , -OH, shows good flocculation performance and complexation, so that it can produce complexation with transition metal ions, humic acid substances and surfactants in water, and can realize the removal of water-soluble organic pollutants However, chitosan is insoluble in water, alkali (pH>6.5) and general organic solvents, and can only be dissolved in some organic acids, such as formic acid, acetic acid, tartaric acid and citric acid, thus limiting its scope of applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08B01J20/24C02F1/28C02F101/34C02F101/36
Inventor 张庭廷施媚许文武
Owner ANHUI NORMAL UNIV