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Organic wastewater treatment method based on high-performance polyaniline aerogel

A technology for organic wastewater treatment and polyaniline, which is applied in the field of environmental treatment and can solve problems such as difficulty in separation, recovery and reuse.

Pending Publication Date: 2021-09-24
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyaniline and its composite materials exhibit excellent adsorption properties for organic matter in wastewater, there are still limitations in practical applications: first, polyaniline is usually in the form of powder particles, which are difficult to separate, recycle and reuse; second, polyaniline and The regeneration process of the composite material is mainly to desorb the adsorbate through acid washing or alkali washing, which is easy to generate a large amount of secondary wastewater.
Therefore, it is still extremely challenging to develop high-performance polyaniline adsorption materials that are easy to recycle and do not produce secondary pollution.

Method used

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  • Organic wastewater treatment method based on high-performance polyaniline aerogel
  • Organic wastewater treatment method based on high-performance polyaniline aerogel
  • Organic wastewater treatment method based on high-performance polyaniline aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix 20mL of 0.1mmol / L iron salt solution and 2mL of aniline monomer, slowly add 1.2g of carboxylated cotton fiber under stirring, take it out after 10min and place it in a mold, freeze for 5h and then thaw to obtain a hydrogel. Weigh 26.6g of ferric nitrate nonahydrate according to the molar ratio of oxidant and aniline of 3:1, add it to 2.0mol / L nitric acid solution to dissolve, and soak the obtained hydrogel in the above solution for 24h to make aniline oxidatively polymerized. The polymerized hydrogel is washed with ethanol and deionized water to remove impurities such as oligomers, and finally freeze-dried to obtain polyaniline airgel. Such as figure 1 As shown, the obtained polyaniline airgel is a three-dimensional bulk material with certain compressive mechanical properties, and it can still fully recover its deformation after multiple compressions.

[0037] Take 80mg polyaniline airgel and put it into 20mL organic wastewater for adsorption. The COD removal rate ...

Embodiment 2-3

[0039] Ferric chloride hexahydrate and ferric sulfate hydrate were used instead of ferric nitrate nonahydrate in Example 1 as the iron salt to prepare a hydrogel, and other conditions were consistent with those in Example 1.

Embodiment 4

[0041] Mix 20mL of 0.1mmol / L iron salt solution with 2mL of aniline monomer, slowly add 1g of carboxylated bamboo fiber under stirring, take it out after 10min and place it in a mold, freeze for 10h and then thaw to obtain a hydrogel. Weigh 26.6g of ferric nitrate nonahydrate according to the molar ratio of oxidant and aniline of 3:1, add it to 2.0mol / L nitric acid solution to dissolve, and soak the obtained hydrogel in the above solution for 24h to make aniline oxidatively polymerized. The polymerized hydrogel is washed with ethanol and deionized water to remove impurities such as oligomers, and finally freeze-dried to obtain polyaniline airgel. Take 80mg of polyaniline airgel and put it into 20mL of organic wastewater for adsorption. After the adsorption is saturated, take out and place in 3mmol / L 2 o 2 In the solution for 30 minutes, the degradation of the organic adsorbate and the regeneration of the polyaniline airgel were realized.

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Abstract

The invention discloses an organic wastewater treatment method based on high-performance polyaniline aerogel. According to the preparation method, carboxylated cellulose fibers are introduced in the aniline polymerization process to enhance the mechanical strength of polyaniline, meanwhile, rich carboxyl groups of the carboxylated cellulose fibers are used for complexing Fe 3+, and the polyaniline aerogel adsorption material with good compression mechanical performance and excellent adsorption performance is prepared. The obtained aerogel is added into organic wastewater for adsorption, and the aerogel is removed after saturated adsorption; then the aerogel is put into a regeneration solution containing an oxidizing agent, and Fe 3+ in the aerogel is utilized to activate the oxidizing agent to generate free radicals so as to realize degradation of organic adsorbate and regeneration of the polyaniline aerogel. The method effectively solves the problems that a conventional polyaniline adsorption material is in a powder particle shape and is difficult to recover, and secondary pollution is easily generated after regeneration of adsorbed organic matters, and provides a new thought and a new method for effectively purifying organic wastewater.

Description

technical field [0001] The invention belongs to the field of environmental management, and specifically refers to a method for treating organic wastewater based on high-performance polyaniline airgel. Background technique [0002] As a major producer of fine chemicals, my country ranks first in the world in the discharge of organic wastewater. The content of organic matter in organic wastewater is large, and most of them exist in the form of aromatic groups such as benzene, naphthalene, anthracene, and quinone. It has the characteristics of complex and changeable components, stable chemical properties, and difficult biodegradation. Therefore, how to efficiently remove organic pollutants in organic wastewater has become a difficult and hot spot in environmental governance. Among the many methods for treating organic wastewater, the adsorption method is considered to be one of the most effective methods for treating organic wastewater due to its advantages of simple operation...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/26B01J20/28B01J20/30C02F101/30
CPCC02F1/285B01J20/262B01J20/28047C02F2101/30C02F2303/16B01J2220/4825B01J2220/4812
Inventor 王文涛赖欣婷闫士全姚玉元
Owner ZHEJIANG SCI-TECH UNIV
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