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Preparation method of polyamine compound-modified magnetic chitosan and application thereof

A chitosan, amine modification technology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of small adsorption capacity, long adsorption time, difficult recovery, etc. High, good adsorption effect

Inactive Publication Date: 2014-09-24
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the disadvantages of small adsorption capacity, long adsorption time, difficult separation, difficult recovery and low reutilization rate of the adsorption material in the current heavy metal wastewater treatment. It uses chitosan as the matrix and combines nanotechnology and magnetic separation technology to design and synthesize a A polyamine compound modified magnetic chitosan nano-adsorbent is used for the treatment of heavy metal wastewater, which greatly improves its adsorption capacity and adsorption rate, is easy to operate, realizes rapid water-agent separation, and has good reusability

Method used

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  • Preparation method of polyamine compound-modified magnetic chitosan and application thereof
  • Preparation method of polyamine compound-modified magnetic chitosan and application thereof
  • Preparation method of polyamine compound-modified magnetic chitosan and application thereof

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Embodiment 1

[0023] The degree of deacetylation of the chitosan used is greater than 90%, purchased from Shanghai Lanji Technology Development Co., Ltd.

[0024] (1) Preparation of triethylenetetramine modified chitosan

[0025] Dissolve 1g of chitosan (CS) in 100ml of 2% acetic acid solution, add 20ml of dimethyl sulfoxide, and swell for 2 hours; add it to the lye to precipitate while stirring, filter with suction, wash with acetone, and pump until semi-dry. Transfer it into 100ml of acetone, stir to form a suspension, add 5ml of epichlorohydrin dropwise, adjust the temperature to 35°C and react for 24h. Then add 6ml of triethylenetetramine, adjust the temperature to 60°C and react for 6 hours, then add 10ml of triethylenetetramine, 50ml of 1mol / L sodium hydroxide solution, and 0.05g of potassium iodide, continue stirring for 4 hours, cool, filter with suction, and use in turn Wash thoroughly with ionized water, absolute ethanol and acetone, and dry under vacuum at 60°C to obtain a yello...

Embodiment 2

[0033] Step (1), (3) are the same as embodiment 1

[0034] (2) Carboxymethylation of triethylenetetramine modified chitosan

[0035] Take 1.5g of the product in (1) in a three-necked flask, add 20ml of dimethyl sulfoxide and 10ml of 5mol / L sodium hydroxide solution, stir and alkalize at 30°C for 2h; take 5g of chloroacetic acid and dissolve it in 15ml of water, Make it slightly alkaline, add 1g of potassium iodide into the flask, then add 0.1g of hexadecyltrimethylammonium bromide, adjust the temperature to 70°C and react for 5h. Cool to room temperature, wash thoroughly with deionized water, absolute ethanol, and acetone successively, and dry under vacuum at 60°C to obtain a yellow product (TETA-CMCS).

[0036] Invention effect

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Abstract

The invention provides a preparation method of polyamine compound-modified magnetic chitosan and an application thereof. The preparation method comprises the following steps: firstly swelling chitosan with a 2% acetic acid solution, then connecting triethylene tetramine to the chitosan molecules by epoxy chloropropane, performing carboxymethylation of the above product by chloroacetic acid, and finally introducing magnetic ferroferric oxide into the triethylene tetramine-grafted chitosan molecules by using N,N'-dicyclohexyl carbimide with N,N-dimethyl formamide as a solvent, so as to obtain a target adsorbent. The adsorbent of the invention is mainly used for adsorption treatment of heavy metal ion-polluted waste water, not only can be used for adsorption recovery of single heavy metal ion, but also can be used for adsorption treatment of waste water polluted by a plurality of heavy metal ions, has the advantages of good adsorption effect, no secondary pollution, easy separation, recyclability, cheap and easily available raw materials, and the like, and is a potential heavy metal waste water treating agent.

Description

technical field [0001] The invention relates to a preparation method of polyamine compound-modified magnetic chitosan. The prepared product is mainly used for adsorption treatment of waste water polluted by heavy metal ions, is a potential waste water treatment agent, and belongs to the field of heavy metal ion waste water treatment. Background technique [0002] Heavy metal pollution is one of the three major water pollution methods in the world today. After heavy metals enter the environment, they cannot be biodegraded, and will accumulate in the body, disrupting normal metabolic activities, and endangering health. Some heavy metals also have carcinogenic effects. At present, the heavy metal wastewater treatment methods adopted by countries all over the world mainly include: precipitation method, electrochemical method, membrane separation method, adsorption method and so on. Among them, the adsorption method of chitosan and its derivatives has become one of the research ...

Claims

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Application Information

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IPC IPC(8): C08B37/08B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCY02P20/582
Inventor 吴占超王召占匡少平
Owner QINGDAO UNIV OF SCI & TECH
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