Chitosan derivative and preparation method thereof

A chitosan derivative, chitosan technology, applied in the field of polymer chemistry, can solve the problems of small molecular weight, high use cost, poor bridging ability, etc., and achieve the effect of good adsorption performance and improved removal ability

Inactive Publication Date: 2012-08-01
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming that chitosan molecular weight is little, bridging ability is poor, and use cost is high, provides a kind of complex state Cu 2+ , Pb 2+ and Zn 2+ Chitosan derivatives with adsorption of heavy metal ions, can be used as heavy metal flocculants

Method used

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  • Chitosan derivative and preparation method thereof
  • Chitosan derivative and preparation method thereof
  • Chitosan derivative and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 5 g of dried chitosan and put it into a four-neck bottle, add 400ml of 2% wt acetic acid, and heat to 80°C on a water bath until all the chitosan is dissolved in acetic acid. Cool the chitosan acetic acid solution to 45° C., add 0.65 g of potassium peroxodisulfate and 0.25 g of sodium bisulfite under nitrogen protection, and stir mechanically for 30 minutes. Add 21 g of acrylamide into the four-necked bottle, and drop 6 g of acrylic acid into it through a constant pressure dropping funnel within 90 minutes, then continue to react at 45 degrees Celsius for 1 hour. Adjust the pH of the reaction solution to about 7 with 0.5 mol / L sodium hydroxide to obtain a white flocculent precipitate, which is suction-filtered at room temperature, washed with acetone and then suction-filtered to obtain a crude product. The crude product was dried and extracted with N,N-dimethylformamide Soxhlet for 12 hours, then filtered with suction, and dried in vacuum to obtain chitosan derivat...

Embodiment 2

[0036] Take 5 g of dried chitosan and put it into a four-neck bottle, add 400ml of 2% wt acetic acid, and heat to 80°C on a water bath until all the chitosan is dissolved in acetic acid. Cool the chitosan acetic acid solution to 30° C., add 0.65 g of potassium peroxodisulfate and 0.07 g of sodium bisulfite under nitrogen protection, and stir mechanically for 30 minutes. 22.5 g of acrylamide was added into the four-neck flask, and at the same time, 7.5 g of acrylic acid was dropped into it through a constant pressure dropping funnel within 2 hours, and the reaction was continued at 55° C. for 1 hour. The pH value of the reaction solution was adjusted to about 7 with sodium hydroxide to obtain a white flocculent precipitate, which was suction filtered at room temperature, washed with acetone and then suction filtered to obtain a crude product. The crude product was extracted with N,N-dimethylformamide Soxhlet for 12 hours, then suction-filtered, and vacuum-dried to obtain the pr...

Embodiment 3

[0038] Take 5 g of dried chitosan and put it into a four-neck bottle, add 400ml of 2% wt acetic acid, and heat to 80°C on a water bath until all the chitosan is dissolved in acetic acid. Cool the chitosan acetic acid solution to 45° C., add 0.65 g of potassium peroxodisulfate and 0.12 g of sodium bisulfite under nitrogen protection, and stir mechanically for 30 minutes. 11.6 g of acrylamide was added into the four-neck flask, and at the same time, 4.5 g of acrylic acid was dropped into it through a constant pressure dropping funnel within 2.5 hours, and the reaction was continued at 40 degrees Celsius for 40 minutes. Adjust the pH of the reaction solution to about 7 with 0.5 mol / L sodium hydroxide to obtain a white flocculent precipitate, which is suction-filtered at room temperature, washed with acetone and then suction-filtered to obtain a crude product. The crude product was dried and extracted with N,N-dimethylformamide Soxhlet for 10 hours, then suction-filtered, and vacu...

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Abstract

The invention discloses a chitosan derivative which is prepared by taking dipotassium sulphate-sodium bisulfite as initiating agent to carry out graft copolymerization to chitosan, acrylamide and acrylic acid, and the materialization indexes of the chitosan derivative are as follows: pale yellow powdered solid is dissolved into acetic acid, and the molecular weight is 50 to 70 KD; and the removal ratios of the chitosan derivative to complexing state Cu2+, Pb2+ and Zn2+ with the concentration of 10mg/L reach 91.9 percent, 98.2 percent and 99.0 percent respectively. The chitosan derivative provided by the invention overcomes the defects of small chitosan molecular mass, poor bridge erecting bridge erecting and high using cost, has better removing capability than chitosan to the three complexing state ions, and can be used as flocculating agent for removing CU2+, Pb2+ and Zn2+ in waste water.

Description

technical field [0001] The invention relates to a chitosan chemically modified functional derivative and a preparation method thereof, which is applied to the treatment of heavy metal-containing wastewater and belongs to the field of polymer chemistry. Background technique [0002] Chitosan is the deacetylation product of chitin, and it is the only alkaline polysaccharide with cations that exists in large quantities in the biological world. The polymer chain contains -OH, -NH 2 The active groups will form cationic polyelectrolytes with high charge density in acidic solution, showing good complexation and flocculation properties. And because of its non-toxic, no secondary pollution and good biodegradability, its application in wastewater treatment has attracted more and more attention from scientific researchers. However, chitosan has the disadvantages of small molecular weight, poor bridging ability, and high cost, which limit its application in the treatment of heavy meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08B37/08C02F1/56C02F1/62
Inventor 唐洪杰单宝田郭娟娟
Owner OCEAN UNIV OF CHINA
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