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Method for removing sulfonic-group-containing dye in alkaline waste water by using magnetic chitosan adsorbent

A technology of chitosan and adsorbent, which is applied in the field of wastewater post-treatment to achieve the effects of low recycling cost, easy separation and simple operation

Inactive Publication Date: 2011-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optimal pH value of the adsorbent is 4, which means that the adsorbent can only be used for the treatment of acid dye wastewater

Method used

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  • Method for removing sulfonic-group-containing dye in alkaline waste water by using magnetic chitosan adsorbent
  • Method for removing sulfonic-group-containing dye in alkaline waste water by using magnetic chitosan adsorbent
  • Method for removing sulfonic-group-containing dye in alkaline waste water by using magnetic chitosan adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare 0.1mol / L FeCl 3 Solution 50mL (0.005mol), slowly add chitosan 2.67g (molecular weight is 1,000,000, deacetylation degree is 91%), make chitosan and Fe 3+The molar ratio of the chitosan-iron complex is 3:1, keep stirring for 2 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , then add 0.067g nano Fe 3 o 4 Stir and mix well, then add 25% glutaraldehyde 5mL, cross-linking reaction for 2 hours, finally use absolute ethanol to wash glutaraldehyde again, magnetically separate, dry at 80°C, grind finely, and prepare magnetic chitosan-iron adsorption agent.

Embodiment 2

[0026] Prepare 0.1mol / L FeCl 3 Solution 50mL (0.005mol), slowly add chitosan 2.67g (molecular weight is 1,000,000, deacetylation degree is 91%), make chitosan and Fe 3+ The molar ratio of the chitosan-iron complex is 3:1, keep stirring for 2 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , then add 0.133g nano Fe 3 o 4 Stir and mix well, then add 25% glutaraldehyde 5mL, cross-linking reaction for 2 hours, finally use absolute ethanol to wash glutaraldehyde again, magnetically separate, dry at 80°C, grind finely, and prepare magnetic chitosan-iron adsorption agent.

Embodiment 3

[0028] Prepare 0.1mol / L FeCl 3 Solution 50mL (0.005mol), slowly add chitosan 2.67g (molecular weight is 1,000,000, deacetylation degree is 91%), make chitosan and Fe 3+ The molar ratio of the chitosan-iron complex is 3:1, keep stirring for 2 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , then add 0.67g nano Fe 3 o 4 Stir and mix well, then add 25% glutaraldehyde 5mL, cross-linking reaction for 2 hours, finally use absolute ethanol to wash glutaraldehyde again, magnetically separate, dry at 80°C, grind finely, and prepare magnetic chitosan-iron adsorption agent.

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Abstract

The invention discloses a method for removing sulfonic-group-containing dye in alkaline waste water by using a magnetic chitosan adsorbent, which comprises the following steps: (1) dissolving chitosan in an iron chloride water solution, stirring, adding ethanol to precipitate a solid, filtering out the solid, washing, mixing the solid with nano magnetic ferroferric oxide, carrying out cross-linking reaction with a glutaric dialdehyde water solution, and carrying out after-treatment to obtain a magnetic chitosan adsorbent; (2) adding the obtained magnetic chitosan adsorbent into an alkaline waste water solution containing the sulfonic-group-containing dye, stirring, carrying out magnetic separation, and drying to obtain the dye-adsorbed magnetic chitosan adsorbent; and (3) adding the dye-adsorbed magnetic chitosan adsorbent into a water solution containing a desorbing agent, stirring, and filtering to obtain a dye recovered solution and the recovered magnetic chitosan adsorbent. The method disclosed by the invention is simple to operate, has the advantages of environment friendliness and low cost, and has wide industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of wastewater post-treatment, and in particular relates to a method for removing dyes containing sulfonic acid groups in alkaline wastewater with a magnetic chitosan adsorbent. Background technique [0002] With the rapid development of my country's economy and society and the continuous acceleration of urbanization, water shortage and pollution have become important factors restricting the sustainable development of the national economy. The textile printing and dyeing industry is a large discharge of industrial wastewater. The printing and dyeing wastewater not only has a large amount of water, large fluctuations in water quality, complex components and high content of pollutants, but also high chroma, chemical oxygen demand (COD) and biochemical oxygen demand (BOD). It also contains a large amount of toxic and refractory organic substances. Such organic pollutants are persistent and will remain in the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12B01J20/24B01J20/30B01J20/34C02F1/28C02F103/30
Inventor 文岳中沈忱思陈慧刘维屏
Owner ZHEJIANG UNIV
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