Acrylic chelating fibre for removing heavy metal ion in water and preparation

A technology of heavy metal ions and acrylic fibers, which is applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve problems such as instability of functional groups, and achieve simple preparation, fast speed and low cost Effect

Inactive Publication Date: 2008-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fiber contains both amino groups and hydroxime groups, which improves the complexing effect on metal ions, but still has the disadvantage of unstable functional groups

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 0.751 g of dried acrylic fiber, put it into 40 ml of tetraethylenepentamine whose temperature has been kept at 145-146° C., stir it with electromagnetic, and react for 1 hour. Take out the fibers, filter them with suction, wash them with deionized water until the water becomes neutral, and dry them in an oven at 70°C. The resulting tetraethylenepentamine-modified fiber weighed 1.026 grams.

[0013] Put 1.026 grams of the fiber obtained above into 20 milliliters of deionized water, heat to boiling, add dropwise 100 milliliters of aqueous solution prepared by 2 grams of chloroacetic acid and 3.6 grams of sodium bicarbonate under reflux, and continue the reflux reaction after the addition is complete 30 minutes. Filter with suction, wash with deionized water until the water becomes neutral, and dry in an oven at 70°C. Obtained poly(carboxymethyl)tetraethylenepentamine modified fiber 1.265 g.

Embodiment 2

[0015] Take 0.884 g of dried acrylic fiber, put it into 40 ml of diethylenetriamine whose temperature has been kept at 141-142° C., stir it electromagnetically, and react for 12 minutes. Take out the fibers, filter them with suction, wash them with deionized water until the water becomes neutral, and dry them in an oven at 70°C. The obtained diethylenetriamine modified fiber weighed 1.124 g.

[0016] Put 1.124 grams of the fiber obtained above into 20 milliliters of water, heat to boiling, add dropwise 100 milliliters of aqueous solution prepared by 1 gram of chloroacetic acid and 1.8 grams of sodium bicarbonate under reflux, after the addition is complete, continue the reflux reaction for 1 hour . Filter with suction, wash with deionized water until the water becomes neutral, and dry in an oven at 70°C. 1.293 g of poly(carboxymethyl)diethylenetriamine modified fiber was obtained.

Embodiment 3

[0018] Take 0.863 g of dried acrylic fiber, put it into a solution made of 25 ml of diethylenetriamine and 25 ml of deionized water, stir it electromagnetically, and react under reflux for 3 hours. Take out the fibers, filter them with suction, wash them with deionized water until the water becomes neutral, and dry them in an oven at 70°C. The obtained diethylenetriamine modified fiber weighed 0.932 g.

[0019] Put 0.932 g of the fiber obtained above into 20 ml of water, heat to boiling, add dropwise 100 ml of aqueous solution prepared by 2 g of chloroacetic acid and 3.6 g of sodium bicarbonate under reflux, and continue the reflux reaction for 1 hour after the addition is complete . Filter with suction, wash with deionized water until the water becomes neutral, and dry in an oven at 70°C. 1.012 g of poly(carboxymethyl)diethylenetriamine modified fiber was obtained.

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Abstract

The invention discloses an acrylic chelating fiber for removing heavy metal ions in water and the preparation method, belonging to chelating fiber technology. The chelating fiber adopts acrylic fiber as matrix, and the matrix loads poly (carboxymethyl) amino functional group by means of covalent bond. The preparation method of the acrylic chelating fiber comprises the following steps: enabling amination reaction of the acrylic fiber and polyamine or polyamine water solution; enabling carboxy methylation reaction with the alkali-bearing chloroacetic acid water solution after washing and drying, so as to obtain the acrylic chelating fiber with poly (carboxymethyl) amino functional group. The acrylic chelating fiber has the advantages of wide and excellent performance for complexing heavy metal ions, high complex capacity and high complex speed of metal ion, simple preparation and low cost.

Description

technical field [0001] The invention relates to an acrylic chelated fiber for removing heavy metal ions in water and a preparation method thereof, belonging to the chelated fiber technology. Background technique [0002] Chelating fiber is an ideal material for removing and recovering metal ions. Chelate fiber has the outstanding advantages of large specific surface area, large adsorption capacity, fast adsorption speed, and the adsorbed metal can be eluted and recycled. Acrylic-based chelating fibers can be classified according to different functional groups: one is amino group as the main functional group, for example: Chang Xijun prepared semicarbazide-modified acrylic chelating fibers by reacting semicarbazide with acrylic fibers. It is suitable for adsorbing trace metal ions such as: indium, bismuth, etc. (Analytica Chimica Acta, 427, 2001, 287-291), but this chelating fiber has poor stability and only has good chelating properties for a limited number of metal ions H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28C02F1/62
Inventor 张文勤张连海张鑫松何磊
Owner TIANJIN UNIV
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