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Method for synthesizing crosslinking succinyl xanthic acid chitosan and application thereof to aspect of heavy metal ion adsorption

A technology of succinyl xanthate and succinylated chitosan, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem that the adsorption effect of heavy metal ions is easily affected by water quality, chitosan Low mechanical strength, limited application of chitosan, etc., to achieve good chemical stability and biocompatibility, good environmental and economic benefits, and the effect of enhancing acid resistance and adsorption capacity

Active Publication Date: 2016-03-23
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low mechanical strength of chitosan, as an alkaline polysaccharide, it is easy to dissolve in acidic medium, and the adsorption effect on heavy metal ions is easily affected by water quality, so the application of chitosan is greatly limited.
At the same time, there is a problem of small adsorption capacity for low-concentration heavy metal ions in aqueous solution

Method used

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  • Method for synthesizing crosslinking succinyl xanthic acid chitosan and application thereof to aspect of heavy metal ion adsorption
  • Method for synthesizing crosslinking succinyl xanthic acid chitosan and application thereof to aspect of heavy metal ion adsorption
  • Method for synthesizing crosslinking succinyl xanthic acid chitosan and application thereof to aspect of heavy metal ion adsorption

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Embodiment 1

[0041] A kind of synthetic method of crosslinked succinyl xanthogenate chitosan, described synthetic method comprises the following steps:

[0042] (a) Synthesis of the sodium salt of N-succinylated chitosan, coded as HCS

[0043] Add 4g of chitosan (coded as CS) to 80ml of dimethyl sulfoxide solvent, add 2g of succinic anhydride, then add 4ml of triethylamine, heat and stir at 40°C for 8h. After the reaction, filter with suction, add the filter residue to 200ml of water, adjust the pH of the system to neutral with 5% sodium hydroxide solution, add 2-3 times the volume of the system to precipitate with absolute ethanol, filter with suction, and use a volume fraction of 70% for the filter residue % ethanol washed twice, and finally dried at 105°C to obtain the sodium salt of N-succinylated chitosan, whose product number is denoted as HCS;

[0044] (b) Synthesis of xanthated chitosan, numbered HXCS

[0045] Add 2 g of sodium salt of succinylated chitosan to 100 ml of 5% NaOH s...

Embodiment 2

[0049] A kind of synthetic method of crosslinked succinyl xanthogenate chitosan, described synthetic method comprises the following steps:

[0050] (a) Synthesis of the sodium salt of N-succinylated chitosan, coded as HCS

[0051]Add 4g of chitosan (coded as CS) to 120ml of dimethyl sulfoxide solvent, add 3g of succinic anhydride, then add 6ml of triethylamine, heat and stir at 45°C for 5h. After the reaction, filter with suction, add the filter residue to 200ml of water, adjust the pH of the system to neutral with 5% sodium hydroxide solution, add 2-3 times the volume of the system to precipitate with absolute ethanol, filter with suction, and use a volume fraction of 75% for the filter residue. % ethanol was washed 3 times, and finally dried at 105°C to obtain the sodium salt of N-succinylated chitosan, the product number of which was denoted as HCS;

[0052] (b) Synthesis of xanthated chitosan, numbered HXCS

[0053] Add 2 g of sodium salt of succinylated chitosan to 150 ...

Embodiment 3

[0057] A kind of synthetic method of crosslinked succinyl xanthogenate chitosan, described synthetic method comprises the following steps:

[0058] (a) Synthesis of the sodium salt of N-succinylated chitosan, coded as HCS

[0059] Add 4g of chitosan (coded as CS) to 160ml of dimethyl sulfoxide solvent, add 4g of succinic anhydride and 8ml of triethylamine, and heat and stir at 60°C for 6h. After the reaction, filter with suction, add the filter residue to 200ml of water, adjust the pH of the system to neutral with 5% sodium hydroxide solution, add 2-3 times the system volume of absolute ethanol to precipitate, filter with suction, and wash the filter residue with absolute ethanol 3 times, and finally dried at 105°C to obtain the sodium salt of N-succinylated chitosan, the product number is marked as HCS;

[0060] (b) Synthesis of xanthated chitosan, numbered HXCS

[0061] Add 2 g of sodium salt of succinylated chitosan to 200 ml of 15% NaOH solution, add 1 mL of carbon disul...

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Abstract

The invention discloses a method for synthesizing crosslinking succinyl xanthic acid chitosan and application thereof to the aspect of heavy metal ion adsorption. According to the method, a target product is obtained through the succinylation reaction, the xanthation reaction and the crosslinking reaction. The crosslinking succinyl xanthic acid chitosan obtained according to the synthesizing method has a performance of being insoluble to acid. The synthesizing method is simple and easy to operate, and the aftertreatment of the product is simple. The invention further discloses application of the crosslinking succinyl xanthic acid chitosan serving as a heavy metal ion adsorbing agent. The crosslinking succinyl xanthic acid chitosan can efficiently adsorb various metal ions in water solution, such as Pb2+, Ni2+, Cd2+ and Co2+.

Description

technical field [0001] The invention relates to a synthesis method and application of cross-linked succinyl xanthate chitosan, in particular to a synthesis method of cross-linked succinyl xanthate chitosan which has an adsorption effect on heavy metal ions and its ability to absorb heavy metal ions. Adsorption applications. Background technique [0002] Chitosan is the product of deacetylation of chitin. It is the only basic polysaccharide in polysaccharides. It is derived from chitin, which is abundant in nature. Its content in nature is second only to polymer cellulose. The chemical name is β-2-amino-2-deoxy-(1,4)-D-glucose, which has a large number of amino and hydroxyl groups in its structure, and Pb in aqueous solution 2+ 、Ni 2+ 、Cd 2+ 、Cu 2+ and other metal ions have a strong binding effect. [0003] As a metal ion adsorbent, it has the advantages of non-toxic, tasteless, rich in content, good biocompatibility, easy to degrade, etc., and is an ideal heavy metal ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
CPCB01J20/02B01J20/22B01J20/24B01J20/3071B01J20/3078B01J20/3085B01J2220/4812B01J2220/80
Inventor 宋庆平王崇侠
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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