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Chemical bond connected strong cationic grafted amphoteric chitosan flocculant and preparation method thereof

A strong cation, chitosan technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of pH sensitivity of flocculation effect, poor solubility of chitosan, low molecular weight, etc. Simple to use effects

Inactive Publication Date: 2013-11-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Although the synthetic organic polymer flocculant itself is not toxic, the monomers that do not participate in the reaction, such as acrylamide, are very toxic
However, due to the disadvantages of chitosan itself, such as its poor solubility, relatively low molecular weight, and the flocculation effect being sensitive to pH, its practical application has also been limited.

Method used

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  • Chemical bond connected strong cationic grafted amphoteric chitosan flocculant and preparation method thereof
  • Chemical bond connected strong cationic grafted amphoteric chitosan flocculant and preparation method thereof
  • Chemical bond connected strong cationic grafted amphoteric chitosan flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Disperse chitosan (viscosity average molecular weight 800,000, deacetylation degree 85.2%) in 10% sodium hydroxide solution (solvent is a mixed solvent of water and isopropanol, wherein the mass ratio of water to isopropanol 1:1), alkalized for 1 hour; after that, add 50% isopropanol solution with chloroacetic acid mass percentage concentration (the mass ratio of chloroacetic acid and chitosan is 1:1), and react at 50°C for 4 hours After the reaction is completed, ethanol is used as a precipitating agent for precipitation and separation to obtain amphoteric carboxymethyl chitosan. Amphoteric carboxymethyl chitosan is dissolved in water, and it is configured into a solution with a mass percentage concentration of amphoteric carboxymethyl chitosan of 1%. After the solution is uniform, potassium persulfate is added as an initiator (addition amount is carboxymethyl chitosan 2% of the moles of chitosan units), and then add methacryloyloxyethyltrimethylammonium chloride (meth...

Embodiment 2

[0039] Disperse chitosan (viscosity average molecular weight 500,000, deacetylation degree 89.7%) in 1% potassium hydroxide solution (solvent is a mixed solvent of water and isopropanol, wherein the mass ratio of water to isopropanol 1:3), alkalized for 1.5 hours; after that, add 30% isopropanol solution of chloroacetic acid mass percentage concentration (the mass ratio of chloroacetic acid and chitosan is 2:1), and react at 60°C for 5 hours After the reaction is completed, ethanol is used as a precipitating agent for precipitation and separation to obtain amphoteric carboxymethyl chitosan. Dissolve amphoteric carboxymethyl chitosan in water, and configure a solution with a concentration of 2% of amphoteric carboxymethyl chitosan in mass percent. After the solution is uniform, add cerium ammonium nitrate as an initiator (addition amount is 3% of the moles of chitosan units), and then add methacryloyloxyethyltrimethylammonium chloride (methacryloyloxyethyltrimethylammonium chlo...

Embodiment 3

[0041] Disperse chitosan (viscosity average molecular weight 52,000, deacetylation degree 94.8%) in 15% sodium hydroxide solution (solvent is a mixed solvent of water and isopropanol, wherein the mass ratio of water to isopropanol 1:0.2), alkalized for 2 hours; after that, add isopropanol solution with chloroacetic acid mass percentage concentration of 20% (the mass ratio of chloroacetic acid and chitosan is 3:1), and react at 30°C for 1 hour After the reaction is completed, ethanol is used as a precipitating agent for precipitation and separation to obtain amphoteric carboxymethyl chitosan. Amphoteric carboxymethyl chitosan is dissolved in water, and it is configured into a solution with a mass percent concentration of amphoteric carboxymethyl chitosan of 1.5%. After the solution is uniform, ammonium persulfate is added as an initiator (addition amount is carboxymethyl chitosan 1% of the moles of chitosan units), and then add methacryloyloxyethyltrimethylammonium chloride (me...

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Abstract

The invention relates to a chemical bond connected strong cationic grafted amphoteric chitosan flocculant which is obtained by grafting strong cationic monomers to amphoteric carboxymethyl chitosan in an acidic condition through copolymerization. The chemical bond connected strong cationic grafted amphoteric chitosan flocculant is in such a structure as follows: in the chemical bond connected strong cationic grafted amphoteric chitosan flocculant, degree of substitution of a carboxylic acid group is 5-90%, methylacryloyl oxyethyl trimethyl ammonium chloride is a strong cationic monomer, and polymethylacryloyl oxyethyl trimethyl ammonium chloride accounts for 5-80% by mass of the chemical bond connected strong cationic grafted amphoteric chitosan flocculant. The flocculant provided by the invention has amphoteric characteristics, so that not only is the flocculant property improved, but also the dissolving property is improved. The raw material chitosan is wide in source, natural, non-toxic and degradable. The flocculant has multiple functions of good flocculation effect, metal ion absorption, bacteriostasis, deodorization, decoloration, and effective reduction of COD (Chemical Oxygen Demand) value and the like.

Description

technical field [0001] The invention relates to a chemically bonded strong cationic grafted amphoteric chitosan flocculant. Background technique [0002] Water is a basic need for human survival. However, with the rapid development of industry in recent years, water pollution has become one of the biggest environmental problems facing mankind. As far as my country's water resources situation is concerned, the seven major water systems, major lakes, coastal waters, and groundwater in some areas in China are all severely polluted, and 90% of the water flowing through cities does not meet the standards for drinking water sources. Water pollution reduces the use function of water bodies, exacerbates the shortage of water resources, and has a great negative impact on the implementation of my country's sustainable development strategy. The protection of water resources is imminent. Fortunately, the safety and security of water sources has already attracted great attention from t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08F251/00C08B37/08
Inventor 杨琥杨朕李海江严涵蔡涛李爱民
Owner NANJING UNIV
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