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A kind of carboxymethyl-polyaminated chitosan decolorizing agent and its preparation method and application

A technology of polyaminated chitosan and carboxymethyl, which is applied in the field of sewage treatment of environmental governance, can solve the problems of poor dye adsorption performance, weak isoanion chelation performance, and poor dye removal effect, and achieve superior Effects of adsorption performance, improvement of solubility performance, enhancement of decolorization performance

Active Publication Date: 2019-02-26
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But carboxymethylated chitosan and polyaminated chitosan still have some deficiencies: 2 o 7 2- The anion chelating performance is not strong, and the adsorption performance of negatively charged dyes is not good; while polyaminated chitosan is not effective in removing metal cations and positively charged dyes, etc.

Method used

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  • A kind of carboxymethyl-polyaminated chitosan decolorizing agent and its preparation method and application
  • A kind of carboxymethyl-polyaminated chitosan decolorizing agent and its preparation method and application
  • A kind of carboxymethyl-polyaminated chitosan decolorizing agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of carboxymethyl-polyaminated chitosan decolorizer, carries out as follows successively:

[0036] 1) Weigh 5 g of pulverized chitin and suspend in 100 mL of isopropanol to swell at room temperature for 2 h. Slowly add 30 mL of sodium hydroxide solution with a concentration of 8 mol / L dropwise into the above mixture, stir evenly, and freeze overnight in a refrigerator at -10°C. Weigh 10g of chloroacetic acid, dissolve it in 10mL of isopropanol by heating in a water bath, and slowly add it dropwise while stirring with a magnetic stirrer. After the dropwise addition, keep warm in a water bath at 50°C. Pour out the supernatant, add about 30 mL of water to dissolve, filter with suction, precipitate the filtrate with 3 times the amount of absolute ethanol, wash with 95% ethanol solution, and dry in vacuum to obtain O-carboxymethyl chitin.

[0037] 2) Put the obtained O-carboxymethyl chitin into a 50% sodium hydroxide solution, stir evenly, react ...

Embodiment 2

[0040] A kind of preparation method of carboxymethyl-polyaminated chitosan decolorizer, carries out as follows successively:

[0041] 1) Weigh 8 g of pulverized chitin suspended in 100 mL of isopropanol and swell at room temperature for 2 h. Slowly add 60 mL of sodium hydroxide solution with a concentration of 8 mol / L dropwise into the above mixture, stir evenly, and freeze overnight in a refrigerator at -10°C. Weigh 10g of chloroacetic acid, dissolve it in 10mL of isopropanol by heating in a water bath, and slowly add it dropwise while stirring with a magnetic stirrer. After the dropwise addition, keep warm in a water bath at 50°C. Pour out the supernatant, add about 30 mL of water to dissolve, filter with suction, precipitate the filtrate with 3 times the amount of absolute ethanol, wash with 95% ethanol solution, and dry in vacuum to obtain O-carboxymethyl chitin.

[0042] 2) Put the obtained O-carboxymethyl chitin into a 50% sodium hydroxide solution, stir evenly, react at ...

Embodiment 3

[0045] A kind of preparation method of carboxymethyl-polyaminated chitosan decolorizer, carries out as follows successively:

[0046] 1) Weigh 10 g of crushed chitin and suspend in 100 mL of isopropanol to swell at room temperature for 2 h. Slowly add 60 mL of sodium hydroxide solution with a concentration of 8 mol / L dropwise into the above mixture, stir evenly, and freeze overnight in a refrigerator at -10°C. Weigh 15g of chloroacetic acid, dissolve it in 10mL of isopropanol by heating in a water bath, and slowly add it dropwise while stirring with a magnetic stirrer. After the dropwise addition, keep warm in a water bath at 50°C. Pour out the supernatant, add about 30 mL of water to dissolve, filter with suction, precipitate the filtrate with 3 times the amount of absolute ethanol, wash with 95% ethanol solution, and dry in vacuum to obtain O-carboxymethyl chitin.

[0047] 2) Put the obtained O-carboxymethyl chitin into a 50% sodium hydroxide solution, stir evenly, react at...

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Abstract

The invention discloses a carboxymethyl-polyaminated chitosan decolorant, and a preparation method and application thereof. The carboxymethyl-polyaminated chitosan decolorant is prepared from chitin through a carboxymethyl reaction, a deacetylation reaction and an addition reaction. The carboxymethyl-polyaminated chitosan decolorant prepared in the invention retains the inherent excellent properties of no toxicity, no harm, biocompatibility, degradability and the like of chitosan, is substantially improved in dissolving performance, especially has enhanced decoloring performance on dyes and has a wider application scope. The preparation method is short in production period and simple to operate. The carboxymethyl-polyaminated chitosan decolorant can be applied to wastewater treatment chemicals or as a high-efficiency decolorant and is an environment-friendly water treatment agent.

Description

technical field [0001] The invention relates to a decolorizing agent, in particular to a carboxymethyl-polyaminated chitosan decolorizing agent and its preparation method and application, and belongs to the technical field of sewage treatment for environmental governance. Background technique [0002] Chitin is a positively charged natural polymer polysaccharide with abundant reserves in nature. It is a straight chain sugar linked by 2-acetamido-2-deoxy-D-glucose through β-(1-4) glycosidic bonds. Chitosan is the product of deacetylation of chitin macromolecules, and its molecular chain contains reactive groups -NH 2 , -OH, will show the properties of cationic polyelectrolyte in acidic solution, and show good flocculation performance. However, due to its rich amino groups and hydroxyl groups, there are a large number of hydrogen bonds in chitosan molecules, and the entanglement of chitosan carbon chains makes its solubility very small, and chitosan can only be used under aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08B01J20/24B01J20/30C02F1/28
CPCB01J20/24C02F1/286C08B37/003
Inventor 陈萌萌邹志华邢春红
Owner GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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