Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF4 Cites 29 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com