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Preparation of Magnetic Chitosan Nanoparticles and Its Method for Treating Heavy Metal Wastewater

A technology of chitosan nano and chitosan acetic acid, which is applied in the fields of alkali metal compounds, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of weak chemical resistance, mechanical strength, limitations, etc., and achieve simple preparation methods , low cost, small footprint

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

AI Technical Summary

Problems solved by technology

[0003] However, chitosan also has deficiencies in practical applications. Firstly, weak chemical resistance and mechanical strength limit the application of chitosan gel nanoparticles. Secondly, it is difficult to remove pollutants effectively and quickly after adsorption and removal. separated from water

Method used

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  • Preparation of Magnetic Chitosan Nanoparticles and Its Method for Treating Heavy Metal Wastewater
  • Preparation of Magnetic Chitosan Nanoparticles and Its Method for Treating Heavy Metal Wastewater
  • Preparation of Magnetic Chitosan Nanoparticles and Its Method for Treating Heavy Metal Wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The preparation method of magnetic chitosan nanoparticles is carried out according to the following steps:

[0022] (1) 2g chitosan was dissolved in 100mL acetic acid solution to make chitosan acetic acid solution, and then 2.7g FeCl 3 . 6H 2 O and 2.8 g FeSO 4 .7H 2 O (molar ratio 1:1) was dissolved in chitosan acetic acid solution, stirred for 1 h to make it evenly mixed, and left for 0.3 hours;

[0023] (2) 6 mL of ethyl acetate is added to 300 mL of NaOH solution with a mass fraction of 30%, and mixed uniformly to make a NaOH solution containing ethyl acetate;

[0024] (3) The solution obtained in step (1) is slowly dripped into the NaOH solution containing ethyl acetate with a syringe, slowly stirred for 1h, the chitosan gel nanoparticles are solidified, and the remaining NaOH solution containing ethyl acetate is poured The particles formed are washed repeatedly with deionized water until the washing solution becomes neutral to obtain magnetic chitosan nanopar...

Embodiment 2

[0026] The preparation method of magnetic chitosan nanoparticles is carried out according to the following steps:

[0027] (1) 4g chitosan was dissolved in 100mL acetic acid solution to make chitosan acetic acid solution, and then 5.4g FeCl 3 . 6H 2 O and 2.8 g FeSO 4 .7H 2 O (molar ratio 2:1) was dissolved in the chitosan acetic acid solution, stirred for 2 hours to make it evenly mixed, and placed for 0.5 hours;

[0028] (2) 7.5mL of ethyl acetate is added to 300mL of NaOH solution with a mass fraction of 30%, and mixed uniformly to make a NaOH solution containing ethyl acetate;

[0029] (3) The solution obtained in step (1) is slowly dripped into the NaOH solution containing ethyl acetate with a syringe, and stirred slowly for 3h to solidify the chitosan gel nanoparticles, and pour the remaining NaOH solution containing ethyl acetate The particles formed are washed repeatedly with deionized water until the washing solution becomes neutral to obtain magnetic chitosan na...

Embodiment 3

[0032] The preparation method of magnetic chitosan nanoparticles is carried out according to the following steps:

[0033] (1) 6g chitosan is dissolved in 100mL acetic acid solution to make chitosan acetic acid solution, and then 10.8gFecl 3 . 6H 2 O and 2.8gFeSO 4 .7H 2 O (molar ratio 4:1) was dissolved in the chitosan acetic acid solution, stirred for 4 hours to make it evenly mixed, and left for 2 hours;

[0034] (2) 30mL of ethyl acetate is added to 300mL of NaOH solution with a mass fraction of 30%, and mixed uniformly to make a NaOH solution containing ethyl acetate;

[0035] (3) The solution obtained in step (1) is slowly dripped into the NaOH solution containing ethyl acetate with a syringe, slowly stirred for 5h, the chitosan gel nanoparticles are solidified, and the remaining NaOH solution containing ethyl acetate is poured The particles formed are washed repeatedly with deionized water until the washing solution becomes neutral to obtain magnetic chitosan nanop...

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Abstract

The invention discloses a method for preparing magnetic chitosan nano particles and processing heavy metal wastewater, belonging to the technical field of material preparation. The method disclosed by the invention comprises the following steps: firstly, weighing ferrous salt and ferric salt as raw materials for preparing a magnetic material, wherein the raw materials are dispersed in a chitosan acetic acid solution after being dissolved; and dropping the mixed liquor into alkali liquor through an injector to obtain the magnetic chitosan particles, wherein the prepared magnetic chitosan particles are provided with a chitosan-nano ferroferric oxide core shell structure and a nano biological absorption material with excellent absorption performance. The method disclosed by the invention is simple and easy to operate. The nano biological absorption material prepared by the method disclosed by the invention is used for processing the heavy metal wastewater.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to the preparation of magnetic chitosan nanoparticles and a method for treating heavy metal wastewater. Background technique [0002] Chitosan is one of the natural polymer materials with excellent properties. Chitin, the precursor of chitosan, widely exists in crustaceans such as shrimp and crab, and is the second largest natural polymer compound after cellulose in the world. Chitosan is the deacetylation product of chitin, and its molecular chain contains active groups -NH 2 With -OH, it has good complexation and can complex heavy metal ions in water. [0003] However, chitosan also has deficiencies in practical applications. Firstly, weak chemical resistance and mechanical strength limit the application of chitosan gel nanoparticles. Secondly, it is difficult to remove pollutants effectively and quickly after adsorption and removal. Separation from wate...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 王建龙陈玉伟
Owner TSINGHUA UNIV
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