Preparation method of graphene-based novel nano magnetic biological adsorbent

A nano-magnetic and graphene technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, alkali metal compounds, etc., can solve the problems of long adsorption equilibrium time, limited adsorption capacity, poor mechanical properties, etc., and achieve improved adsorption Effects of speed and adsorption capacity, improvement of adsorption capacity, and enhancement of mechanical properties

Inactive Publication Date: 2012-10-10
UNIV OF JINAN
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Problems solved by technology

But in practical application, chitosan still faces some problems, such as: (1) it will be partially dissolved and lost in acidic aqueous solution; (2) the time for adsorp

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  • Preparation method of graphene-based novel nano magnetic biological adsorbent

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example 1

[0022] Example 1: Preparation of magnetic cyclodextrin chitosan / graphene adsorption material

[0023] A. Preparation of functionalized graphene

[0024] Weigh 1.0g of graphite powder and add it to 200mL mixed acid (volume ratio of concentrated nitric acid to concentrated sulfuric acid: 1:6) (in an ice-water bath, add nitric acid first and then sulfuric acid under stirring), stir and react for 0.5h, then add 6.0g permanganese Potassium acid, oil bath 80 ° C, heated to reflux, and reacted for 12 hours. Under ice-bath conditions, slowly add hydrogen peroxide dropwise until no more reaction occurs, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized graphene.

[0025] B. Preparation of Magnetic Cyclodextrin Chitosan

[0026] Dissolve 6.0g of cyclodextrin and 1.0g of chitosan in hydrochloric acid solution, stir for 0.2h to obtain a milky white solution, add 3mL of 50% glutaraldehyde, react at 70°C for 1h, adjust the pH to 7-8, ...

example 2

[0030] Example 2: Preparation of magnetic cyclodextrin chitosan / graphene adsorption material

[0031] A. Preparation of functionalized graphene

[0032] Weigh 1.0g of graphite powder and add it to 200mL of mixed acid (volume ratio of concentrated sulfuric acid to concentrated nitric acid: 1:8) (in an ice-water bath, add nitric acid first and then sulfuric acid under stirring), stir and react for 0.8h, then add 7.0g permanganese Potassium acid, oil bath 85 ° C, heated to reflux, and reacted for 13 hours. Under ice-bath conditions, slowly add hydrogen peroxide dropwise until no more reaction occurs, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized graphene.

[0033] B. Preparation of Magnetic Cyclodextrin Chitosan

[0034] Dissolve 8.0g of cyclodextrin and 1.0g of chitosan in hydrochloric acid solution, stir for 0.3h to obtain a milky white solution, add 4mL of 50% glutaraldehyde, react at 75°C for 1h, adjust the pH to 7-...

example 3

[0038] Example 3: Preparation of magnetic cyclodextrin chitosan / graphene adsorption material

[0039] A. Preparation of functionalized graphene

[0040] Weigh 1.0g of graphite powder and add 200mL of mixed acid (volume ratio of concentrated sulfuric acid to concentrated nitric acid: 1:9) (in an ice-water bath, add nitric acid first and then sulfuric acid under stirring), stir for 1 hour, then add 8.0g of potassium permanganate , oil bath at 95°C, heated to reflux, and reacted for 15h. Under ice-bath conditions, slowly add hydrogen peroxide dropwise until no more reaction occurs, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized graphene.

[0041] B. Preparation of Magnetic Cyclodextrin Chitosan

[0042] Dissolve 9.0g of cyclodextrin and 1.0g of chitosan in hydrochloric acid solution, stir for 0.3h to obtain a milky white solution, add 6mL of 50% glutaraldehyde, react at 90°C for 2h, adjust the pH to 7-8, filter , and dry ...

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Abstract

The invention discloses a preparation method of a graphene-based novel nano magnetic biological adsorbent and particularly relates to modifying the surface of graphene with magnetic cyclodextrin chitosan through a surface grafting technology and a crosslinking method. The novel method is characterized in that the functional graphene is taken as a carrier; and the magnetic cyclodextrin chitosan is obtained through an emulsion crosslinking method, and then is bonded to the surface of the functional graphene to obtain the novel nano magnetic biological adsorbent. Through the preparation method, the mechanical property of the adsorbent is improved, the specific surface area of the adsorbent is greatly enlarged, and the binding and enveloping sites between ions or molecules and the magnetic cyclodextrin chitosan are increased. The nano magnetic adsorption material prepared by the invention has the advantages of controllable surface structure, good stability, strong mechanical property, high adsorptive capacity, quickness in adsorption equilibrium, easiness in separation, high reutilization rate and the like, can be used for separation and enrichment of heavy metals and organic pollutants in waste water and has excellent application potentialities.

Description

technical field [0001] The invention belongs to the preparation method of biological adsorption materials, in particular to the preparation of magnetic cyclodextrin chitosan / graphene by chemical bonding technology and cross-linking method as the 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 has been used in water treatment in various countries as adsorption material, ion exchanger and flocculant. In addition, chitosan can adsorb dyes, proteins, amino acids, nucleic acids, enzymes and halogens through coordination and ion exchange. But in practical application, chitosan still faces some problems, such as: (1) it will be partially dissolved and lost in acidic aqueous solution; (2) the time for adsorption equilibrium is long; (3) it...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
Inventor 罗川南范露露孙敏
Owner UNIV OF JINAN
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