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Preparation method of novel magnetic nano biosorption material

A biosorption and magnetic technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of cumbersome methods, time-consuming, difficult separation of chitosan-modified chitosan, etc., to expand the application field and expand the surface area , Increase the effect of adsorption capacity

Inactive Publication Date: 2012-07-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as chitosan or modified chitosan is difficult to separate from wastewater, and the method is cumbersome and time-consuming.

Method used

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  • Preparation method of novel magnetic nano biosorption material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Example 1: Preparation of carbon nanofiber / magnetic chitosan adsorption material

[0019] A. Preparation of functionalized carbon nanofibers

[0020] Put 0.5g of polyacrylonitrile nanofibers into a tube furnace, raise it from room temperature to 250°C, and then keep it for 2 hours for pre-oxidation treatment; then, under the protection of nitrogen, raise it to 1000°C for high-temperature pyrolysis, and cool naturally to Carbon nanofibers can be obtained at room temperature.

[0021] Add 0.1g of carbon nanofibers to 40mL of mixed acid (1:9 concentrated nitric acid and concentrated sulfuric acid) (in an ice-water bath, add nitric acid first and then sulfuric acid while stirring), heat to reflux in an oil bath at 90°C, and react for 16 hours. Stir for 1 h, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized carbon nanofibers.

[0022] B. Preparation of Magnetic Chitosan

[0023] Dissolve 0.5g of chitosan in 20mL of 1%...

example 2

[0026] Example 2: Preparation of carbon nanofiber / magnetic chitosan adsorption material

[0027] A. Preparation of functionalized carbon nanofibers

[0028] Put 0.5g of polyacrylonitrile nanofibers into a tube furnace, raise it from room temperature to 300°C, and then keep it for 3 hours for pre-oxidation treatment; then, under the protection of nitrogen, raise it to 1000°C for high-temperature pyrolysis, and cool naturally Unactivated carbon nanofibers can be obtained at room temperature.

[0029] Add 0.1g of carbon nanofibers to 40mL of mixed acid (1:9 concentrated nitric acid and concentrated sulfuric acid) (in an ice-water bath, add nitric acid first and then sulfuric acid while stirring), heat to reflux in an oil bath at 90°C, and react for 18 hours. Stir for 1 h, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain activated carbon nanofibers.

[0030] B. Preparation of Magnetic Chitosan

[0031] Dissolve 0.5g of chitosan in 20mL o...

example 3

[0034] Example 3: Preparation of carbon nanofiber / magnetic chitosan adsorption material

[0035] A. Preparation of functionalized carbon nanofibers

[0036] 0.3g of polyacrylonitrile nanofibers were placed in a tube furnace, raised from room temperature to 280°C, and then kept for 3 hours for pre-oxidation treatment; then under the protection of nitrogen, raised to 1100°C for high-temperature pyrolysis, and naturally cooled to Unactivated carbon nanofibers can be obtained at room temperature.

[0037] Add 0.1g of carbon nanofibers to 40mL of mixed acid (1:5 concentrated nitric acid and concentrated sulfuric acid) (in an ice-water bath, add nitric acid first and then sulfuric acid under stirring), heat to reflux in an oil bath at 90°C, and react for 17 hours. Stir for 1 h, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain activated carbon nanofibers.

[0038] B. Preparation of Magnetic Chitosan

[0039] Dissolve 0.5g of chitosan in 20m...

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Abstract

The invention discloses a preparation method of a novel magnetic nano biosorption material based on magnetic chitosan, in particular to a method for modification of the magnetic chitosan on carbon nanofibers via a functionalized surface modification technology. The novel method is characterized in that nano magnetic metal or nano magnetic metal oxide is used as a carrier and is first subjected to surface modification to obtain the magnetic chitosan, and the magnetic chitosan is then bonded to the functionalized carbon nanofibers to obtain the novel magnetic nano biosorption material. By adopting the preparation method, the spatial ordering of molecular arrangement can be improved, the specific surface area of the polymer can be increased greatly, the number of binding sites of ions or molecules and chitosan molecules can be increased, and the internal mass transfer process can be shortened. The prepared nano magnetic adsorption material has the advantages of controllable surface structure, good stability, large adsorption capacity, rapid balancing of adsorption, easy separation and good reusability, is suitable for directed recovery of precious metals and rare earth metals and separation and enrichment of heavy metals in wastewater, and has good potential of application.

Description

technical field [0001] The invention belongs to a preparation method of a biological adsorption material, in particular to preparing carbon nanofiber / magnetic chitosan by a chemical bonding method as an adsorption material for treating waste water. Background technique [0002] Chitosan is a natural polymer compound with excellent biocompatibility and biodegradability, and is considered to be the most potential environment-friendly adsorption material in the field of water treatment. Chitosan is a natural amino polysaccharide, the surface contains a lot of -OH and -NH 2 , so that it has good compatibility with many organic substances and is easy to chemically modify. The structure of chitosan also determines that it can chelate many metal ions. -NH on chitosan surface 2 Can be transformed into -NH under certain conditions 3 + , can attract negatively charged substances to produce adsorption, flocculation and other effects. Therefore, chitosan has been used in water tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/26
Inventor 罗川南范露露孙敏
Owner UNIV OF JINAN
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