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A kind of modified chitosan quaternary ammonium salt and its application

A chitosan quaternary ammonium salt, modified technology, applied in other chemical processes, water/sludge/sewage treatment, water pollutants and other directions, can solve the problems of complex operation, sterilization problems, long start-up time, etc. The effects of simple preparation method, favorable adsorption and easy operation are achieved.

Inactive Publication Date: 2011-11-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although bioremediation has the advantages of a large amount of treated water, a fast degradation rate of perchlorate ions, non-toxic products and low operating costs, it also has the following disadvantages: when drinking water is treated, microorganisms are introduced into the water, which makes the start-up time longer and there are follow-up Sterilization issues; biodegradation needs to supply nutrients and add electron donors, and the system stability is poor; the results of in-situ bioremediation fluctuate with the water quality of the aquifer, soil properties and climate changes, and strict operations must be carried out according to specific environmental characteristics , optimize the best operating conditions, complex operation
At present, there is no relevant research report on the use of chitosan quaternary ammonium salt to remove perchlorate ions in water.

Method used

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  • A kind of modified chitosan quaternary ammonium salt and its application
  • A kind of modified chitosan quaternary ammonium salt and its application
  • A kind of modified chitosan quaternary ammonium salt and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The preparation of embodiment 1 modified chitosan quaternary ammonium salt

[0038] The preparation of the modified chitosan quaternary ammonium salt in this example uses absolute ethanol as a dispersant, glutaraldehyde as a cross-linking agent, and the existing chitosan quaternary ammonium salt as a raw material, which is prepared by a cross-linking reaction. , including the following steps:

[0039] Take a certain amount of chitosan quaternary ammonium salt, disperse it in dehydrated alcohol, be mixed with the solution that the mass percent concentration of chitosan quaternary ammonium salt is 3%, slowly add glutaraldehyde in this solution, until glutaraldehyde The mass percent concentration of aldehyde in the solution is 5%, and the modified chitosan quaternary ammonium salt of the present embodiment can be prepared by shaking and stirring, filtering, washing and drying.

Embodiment 2

[0040] The preparation of embodiment 2 modified chitosan quaternary ammonium salts

[0041] The preparation of the modified chitosan quaternary ammonium salt in this example uses absolute ethanol as a dispersant, glutaraldehyde as a cross-linking agent, and the existing chitosan quaternary ammonium salt as a raw material, which is prepared by a cross-linking reaction. , including the following steps:

[0042] Take by weighing a certain amount of chitosan quaternary ammonium salt, disperse in dehydrated alcohol, be mixed with the solution that the mass percent concentration of chitosan quaternary ammonium salt is 6%, slowly add glutaraldehyde in this solution, until glutaraldehyde The mass percent concentration of aldehyde in the solution is 12.5%, and the modified chitosan quaternary ammonium salt of the present embodiment can be prepared by shaking and stirring, filtering, washing and drying.

Embodiment 3

[0043] Example 3 Adsorption Kinetics Research

[0044] In this embodiment, the modified chitosan quaternary ammonium salt prepared in Example 2 was selected to study its adsorption kinetics for perchlorate ions in wastewater.

[0045] The present embodiment is divided into three concentration groups:

[0046] (1) In group A, the initial concentration of perchlorate ion in wastewater to be treated is 5mg / L;

[0047] (2) In the B group, the initial concentration of perchlorate ion in the waste water to be treated is 10mg / L;

[0048] (3) In group C, the initial concentration of perchlorate ions in the wastewater to be treated is 25 mg / L.

[0049] The present embodiment adds 0.4g / L of modified chitosan quaternary ammonium salt prepared by embodiment 2 respectively to the above-mentioned three concentration groups, and observes the change with time, the effect of modified chitosan quaternary ammonium salt on perchlorate ion The change in the amount of adsorption, the results are a...

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Abstract

The invention discloses a modified chitosan quaternary ammonium salt and an application thereof. The modified chitosan quaternary ammonium salt uses absolute ethanol as a dispersant and glutaraldehyde as a crosslinking agent. Sugar quaternary ammonium salt is prepared by cross-linking reaction. The modified chitosan quaternary ammonium salt of the present invention is added to the wastewater containing perchlorate ions, and the perchlorate ions in the water body are removed through the adsorption reaction of the modified chitosan quaternary ammonium salts to the perchlorate ions . The modified chitosan quaternary ammonium salt of the invention has simple preparation method, mild conditions, easy operation, and the adsorption capacity of perchlorate ions is far greater than that of active carbon. The modified chitosan quaternary ammonium salt of the present invention can be regenerated and reused only by soaking in sodium chloride solution, and the adsorption performance of the regenerated modified chitosan quaternary ammonium salt remains basically unchanged.

Description

technical field [0001] The invention relates to the technical field of repairing water body pollution, in particular to the removal of perchlorate ions in water bodies, and in particular to a modified chitosan quaternary ammonium salt and its application in removing perchlorate ions in water bodies. Background technique [0002] Perchlorate is a common and potentially harmful pollutant, and the existence of perchlorate in water has aroused widespread public concern. Since perchlorate is chemically kinetically inert in aqueous solution, it does not react with most reducing ions when the concentration is <10% (w / w). Therefore, conventional treatment techniques such as coagulation, filtration, activated carbon adsorption, and adding reducing agent ions cannot effectively remove perchlorate. [0003] At present, the most researched and applied technologies for water pollution control are: biological remediation and non-biological remediation. [0004] Abiotic remediation in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08B01J20/24C02F1/28C02F1/58C02F101/12
Inventor 谢燕华李适宇刘广立伍珂王军
Owner SUN YAT SEN UNIV
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