Preparation of sulfur-modified magnetic chitosan and method for treating heavy metal wastewater

A technology of chitosan and chitosan acetic acid, which is applied in chemical instruments and methods, alkali metal compounds, water/sewage treatment, etc., to achieve the effects of small footprint, simple preparation method, and improved adsorption capacity

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 shortcomings in practical applications. After the pollutants are removed by adsorption, it is difficult to effectively and quickly separate them from the water body.

Method used

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  • Preparation of sulfur-modified magnetic chitosan and method for treating heavy metal wastewater
  • Preparation of sulfur-modified magnetic chitosan and method for treating heavy metal wastewater
  • Preparation of sulfur-modified magnetic chitosan and method for treating heavy metal wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of vulcanized modified magnetic chitosan is carried out according to the following steps:

[0023] (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;

[0024] (2) The solution obtained in step (1) is slowly dripped into the NaOH solution with a mass fraction of 30% with a syringe, stirred for 1h, and the chitosan gel nanoparticles are solidified to form magnetic chitosan beads, which are then deionized Water repeatedly washes the magnetic chitosan beads until the washing liquid becomes neutral;

[0025] (3) Suspend the magnetic chitosan beads washed to neutral in 0.01M glutaraldehyde solution and stir slowly for 12h, then wash the cross-linked magnetic chitosan beads with deionized water to neutral and vacuum Dr...

Embodiment 2

[0028] The preparation method of vulcanized modified magnetic chitosan is carried out according to the following steps:

[0029] (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 chitosan acetic acid solution, stirred for 4 hours to make it evenly mixed, and left for 2 hours;

[0030] (2) The solution obtained in step (1) is slowly dripped into the NaOH solution with a mass fraction of 30% with a syringe, stirred for 5h, and the chitosan gel nanoparticles are solidified to form magnetic chitosan beads, which are then deionized Water repeatedly washes the magnetic chitosan beads until the washing liquid becomes neutral;

[0031] (3) Suspend the magnetic chitosan beads washed to neutrality in 0.1M glutaraldehyde solution and stir slowly for 36h, then wash the cross-linked magnetic chitosan beads to neutrality with deionized water and vac...

Embodiment 3

[0035] The preparation method of vulcanized modified magnetic chitosan is carried out according to the following steps:

[0036] (1) 6g chitosan was dissolved in 100mL acetic acid solution to make chitosan acetic acid solution, and then 10.8g FeCl 3 . 6H 2 O and 2.8 g FeSO 4 .7H 2 O (molar ratio 4:1) was dissolved in the chitosan acetic acid solution, stirred for 2 hours to make it evenly mixed, and left for 1 hour;

[0037] (2) The solution obtained in step (1) is slowly dripped into the NaOH solution with a mass fraction of 30% with a syringe, stirred for 3h, and the chitosan gel nanoparticles are solidified to form magnetic chitosan beads, which are then deionized Water repeatedly washes the magnetic chitosan beads until the washing liquid becomes neutral;

[0038] (3) Suspend the magnetic chitosan beads washed to neutrality in 0.05M glutaraldehyde solution and stir slowly for 36h, then wash the cross-linked magnetic chitosan beads with deionized water to neutrality an...

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Abstract

The invention discloses a method for preparing sulfured magnetic chitosan and a method for treating waste water containing heavy metals by using the sulfured magnetic chitosan, which belong to the technical field of material preparation. The method for preparing the sulfured magnetic chitosan comprises: dispersing a ferrous salt and a ferric salt in acetic acid solution of chitosan in advance; dripping the mixed solution into alkaline solution by using an injector to form magnetic chitosan spheres; crosslinking the spheres by using glutaraldehyde to form crosslinked magnetic chitosan spheres;and drying under vacuum, grinding into powder and obtaining the sulfured magnetic chitosan. The prepared material is used for treating waste water containing heavy metals.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to the preparation of vulcanized modified magnetic chitosan 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 shortcomings in practical applications. After the pollutants are removed by adsorption, it is difficult to effectively and quickly separate them from water. In recent years, magnetic separation technology has been applied to the water treatment industry. It is a tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 王建龙陈玉伟
Owner TSINGHUA UNIV
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