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Preparation method of carboxymethyl chitosan gel beads coated with nano iron

A technology of carboxymethyl chitosan gel balls and carboxymethyl chitosan, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problem of poor stability and nano iron It is not easy to oxidize and other problems, so as to improve the reactivity, enhance the ability of environmental repair, and improve the removal efficiency

Inactive Publication Date: 2015-09-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems, the present invention provides a method for preparing polysaccharide-modified nano-iron, which makes nano-iron difficult to oxidize, and improves its agglomeration and stability performance; poor stability and other disadvantages

Method used

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  • Preparation method of carboxymethyl chitosan gel beads coated with nano iron
  • Preparation method of carboxymethyl chitosan gel beads coated with nano iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 1.5 g of carboxymethyl chitosan in a 100 mL plastic beaker, add 48.5 mL of deoxygenated water and magnetically stir to dissolve, and the solution mass concentration is 3.0%. Pour the solution into a freshly prepared 1.0 g nano-iron plastic beaker, stir ultrasonically for 5-10 min under nitrogen protection, and then use a pipette to pipette 1 mL of nano-iron carboxymethyl chitosan solution that is uniformly mixed and drop into 5.0 % calcium chloride solution to form gel balls, and after solidification for 1 hour, wash with deoxygenated water three times for preservation. The gel balls prepared under this condition have poor spheroidity, low mechanical strength, Cr 6+ The removal rate is low.

Embodiment 2

[0035] Weigh 4.5 g of carboxymethyl chitosan in a 100 mL plastic beaker, add 45.5 mL of deoxygenated water and magnetically stir to dissolve, and the solution mass concentration is 9.0%. Pour the solution into a plastic beaker with 1.0 g of nano-iron just prepared, stir ultrasonically for 5-10 min under the protection of nitrogen, then pipette 1 mL of nano-iron carboxymethyl chitosan solution which is uniformly mixed and drop into Gel balls are formed in 5.0% calcium chloride solution, and after curing for 1 hour, they are washed with deoxygenated water for three times and preserved. The gel balls prepared under this condition have poor ball-forming properties, tailing phenomenon, high mechanical strength, Cr 6+ The removal rate is high.

Embodiment 3

[0037] Weigh 2.5g of carboxymethyl chitosan in a 100mL plastic beaker, add 47.5mL of deoxygenated water and magnetically stir to dissolve, the solution mass concentration is 5.0%. Pour the solution into a freshly prepared 1.0 g nano-iron plastic beaker, stir ultrasonically for 5-10 min under nitrogen protection, and then use a pipette to pipette 1 mL of nano-iron carboxymethyl chitosan solution that is uniformly mixed and drop into 5.0 % calcium chloride solution to form gel balls, and after solidification for 1 hour, wash with deoxygenated water three times for preservation. The gel balls prepared under this condition have good spheroidity, high mechanical strength, Cr 6+ The removal rate is high.

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Abstract

The invention relates to a preparation method of a medicament for removing heavy metal ions in wastewater, in particular to a preparation method of carboxymethyl chitosan gel beads coated with nano iron, and belongs to the field of wastewater treatment. The preparation method comprises the following steps: uniformly blending elementary substance nano iron compounded through the liquid phase reduction method with a carboxymethyl chitosan solution; dripping a calcium chloride solution into the mixed solution to form gel beads coated with nano iron. The formed gel beads overcome the defects that nano iron is easy to oxidize and agglomerate and poor in stability, and improve the removing efficiency of gel beads for pollutants. The coating material adopts macromolecule organic matter carboxymethyl chitosan, and is non-toxic and harmless and good in biocompatibility, so that secondary pollution to the environment and the problem of removing nano iron and oxidative products thereof are avoided.

Description

technical field [0001] The invention relates to a method for preparing a medicament for removing heavy metal ions in sewage, belonging to the field of sewage treatment, in particular to a method for preparing coated nano iron carboxymethyl chitosan gel balls. Background technique [0002] Carboxymethylchitosan (CMC) is a water-soluble derivative of chitosan, produced by carboxymethylation of chitosan. Carboxymethyl chitosan has a strong chelating effect on metal ions and is widely used in the fields of water treatment and metal recovery. However, because the cross-linking agent occupies a large amount of active functional groups of carboxymethyl chitosan, the removal efficiency of metal ions is not high when carboxymethyl chitosan gel beads are used alone. [0003] At the same time, a large number of studies have been carried out on the modification and improvement of nano-iron. Through the modification and improvement of nano-iron, its oxidation resistance, dispersion and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08L5/08C08K3/08C02F1/62
Inventor 谢燕华周廷恒吴玉兰李茜施国中韩智勇吴江闵雯雯刘国明
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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