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Epoxy chloropropane modified chitosan for adsorbing heavy metal ions and preparation method thereof

A technology for epichlorohydrin and heavy metal adsorption, which is applied in the direction of alkali metal oxides/hydroxides, alkali metal compounds, chemical instruments and methods, etc., and can solve the problems of low regeneration rate of active substances, insufficient water removal concentration, Consumption of large energy and other issues to achieve the effect of improving mechanical properties and stability, improving adsorption and selectivity, and broadening the scope of application

Inactive Publication Date: 2018-11-23
CHENGDU TEXTILE COLLEGE
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Problems solved by technology

[0003] However, chemical methods mainly include electrolysis and precipitation; among them, electrolysis is only suitable for water with a high concentration, and the effect of low concentration is very poor; precipitation is often affected by the precipitation agent and the environment, and often removes the concentration of water. Can not meet the requirements, and may cause secondary pollution
The physical method has poor adsorption effect, high cost, and very low regeneration rate of active substances, which is not suitable for large-scale use; solution loss and extract regeneration process in the solution extraction process consume a lot of energy, so this method has many advantages. Insufficient and therefore subject to many limitations

Method used

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  • Epoxy chloropropane modified chitosan for adsorbing heavy metal ions and preparation method thereof

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preparation example Construction

[0015] A preparation method for epichlorohydrin modified chitosan for adsorbing heavy metal ions, comprising: using acetic acid solution, chitosan, epichlorohydrin and NaOH solution according to the addition ratio of 100ml:0.51-0.52g:2.8 -3.2ml:24-26ml for compounding; further, the addition ratio is 100ml:0.51-0.52g:3ml:25ml.

[0016] It should be noted that the reaction principle in this embodiment is as follows: the carbon-chlorine bond on the epichlorohydrin breaks to form C + , and condense with the hydroxyl group in chitosan to obtain an ether; at the same time, the epoxy ring at the other end is opened, and another hydroxyl group in chitosan forms an ether to generate chitosan with a cross-linked structure. The cross-linking reaction between epichlorohydrin and chitosan not only improves the mechanical properties of chitosan itself, but also incorporates active groups to change the activity. By controlling the cross-linking point, the epichlorohydrin can be cross-linked...

Embodiment 1

[0026] The present embodiment provides a kind of preparation method of the epichlorohydrin modified chitosan that is used to adsorb heavy metal ions, comprising:

[0027] At 50°C, add 100ml of 3% acetic acid solution to 0.5008g of chitosan until the chitosan is completely dissolved to form a chitosan solution; add 3ml of epichlorohydrin dropwise to the chitosan solution to form Mixed solution; after reacting for 30 minutes, add 25ml of 5% NaOH solution dropwise to the mixed solution until no white precipitate is formed, cool to 20-30°C, wash twice with distilled water, then filter with acetone Wash twice, filter and dry.

Embodiment 2

[0029] The present embodiment provides a kind of preparation method of the epichlorohydrin modified chitosan that is used to adsorb heavy metal ions, comprising:

[0030] At 50°C, add 100ml of 3% acetic acid solution to 0.5108g of chitosan until the chitosan is completely dissolved to form a chitosan solution; add 3ml of epichlorohydrin dropwise to the chitosan solution to form Mixed solution; after reacting for 30 minutes, add 25ml of 5% NaOH solution dropwise to the mixed solution until no white precipitate is formed, cool to 20-30°C, wash twice with distilled water, then filter with acetone Wash twice, filter and dry.

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Abstract

The invention belongs to the technical field of chitosan modification and provides epoxy chloropropane modified chitosan for adsorbing heavy metal ions and a preparation method thereof. The preparation method comprises the step of performing adding and mixing reaction on an acetic acid solution, choitosan, epoxy chloropropane and a NaOH solution according a certain proportion. The preparation method has the advantages of scientific and reasonable design and simpleness in operation; by means of the preparation method, the epoxy chloropropane modified chitosan having excellent adsorption performance can be prepared; the preparation method is suitable for industrial large-scale production. The epoxy chloropropane modified chitosan prepared by the preparation method has the advantages of excellent effect on the aspect of removing and adsorbing heavy metal ions in polluted wastewater, high mechanical property and stability, wide Ph value application range in solutions and very strong adsorption property and selectivity to heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of chitosan modification, and in particular relates to an epichlorohydrin-modified chitosan for absorbing heavy metal ions and a preparation method thereof. Background technique [0002] The development of industrialization in today's society is getting more and more developed, but at the same time it has brought many harms to our environment, which in turn threatens human beings. In particular, the development of industrialization has caused various heavy metal ions to flow into our water resources and invade our land. The treatment of heavy metal ions has attracted more and more attention nowadays. As far as the current situation is concerned, chemical and physical methods are the longest used to deal with heavy metal ions in water. [0003] However, chemical methods mainly include electrolysis and precipitation; among them, electrolysis is only suitable for water with a high concentration, and the effec...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28054C02F1/286C02F2101/20
Inventor 武昆肖伟平
Owner CHENGDU TEXTILE COLLEGE
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