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Graphene oxide and chitosan microsphere and preparation method thereof

A technology of chitosan microspheres and graphene, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of material dissolution and loss, and achieve easy sedimentation, easy sedimentation, and preparation The effect of simple process

Inactive Publication Date: 2016-02-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chitosan is acid-soluble, and the amine group is easily protonated into -NH under acidic conditions. 3+ resulting in loss of material

Method used

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  • Graphene oxide and chitosan microsphere and preparation method thereof
  • Graphene oxide and chitosan microsphere and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A graphene oxide / chitosan microsphere and a preparation method thereof. The steps of the preparation method are:

[0026] Step 1. At room temperature, ultrasonically disperse a graphene oxide solution with a mass concentration of 0.01-0.05% to obtain a graphene oxide dispersion; then the mass ratio of chitosan:graphene oxide is 1:(0.01-0.02 ), dissolving chitosan into the graphene oxide dispersion to obtain a graphene oxide / chitosan mixture.

[0027] Step 2, according to the volume ratio of graphene oxide / chitosan mixture: liquid paraffin: span-80 is 1: (1 ~ 1.1): (0.05 ~ 0.08), add to graphene oxide / chitosan mixture Add liquid paraffin and span-80 in turn, stir for 2-4 hours to obtain the graphene oxide / chitosan emulsified mixture; then the volume ratio of graphene oxide / chitosan emulsified mixture: formaldehyde is 1: (0.05~ 0.07), add formaldehyde to graphene oxide / chitosan emulsified mixed solution, continue to stir for 1 ~ 2h, obtain graphene oxide / chitosan emulsi...

Embodiment 2

[0031] A graphene oxide / chitosan microsphere and a preparation method thereof. The steps of the preparation method are:

[0032] Step 1. At room temperature, ultrasonically disperse a graphene oxide solution with a mass concentration of 0.05-0.1% to obtain a graphene oxide dispersion; then press the mass ratio of chitosan:graphene oxide to be 1:(0.02-0.03 ), dissolving chitosan into the graphene oxide dispersion to obtain a graphene oxide / chitosan mixture.

[0033] Step 2, according to the volume ratio of graphene oxide / chitosan mixed solution: liquid paraffin: span-80 is 1: (1.1 ~ 1.2): (0.07 ~ 0.09), add to graphene oxide / chitosan mixed solution Add liquid paraffin and span-80 in turn, stir for 2-4 hours to obtain the graphene oxide / chitosan emulsified mixture; then the volume ratio of graphene oxide / chitosan emulsified mixture: formaldehyde is 1: (0.06~ 0.08), add formaldehyde in graphene oxide / chitosan emulsified mixed solution, continue to stir for 1 ~ 2h, obtain grap...

Embodiment 3

[0037] A graphene oxide / chitosan microsphere and a preparation method thereof. The steps of the preparation method are:

[0038]Step 1. At room temperature, ultrasonically disperse a graphene oxide solution with a mass concentration of 0.1 to 0.15% to obtain a graphene oxide dispersion; then the mass ratio of chitosan: graphene oxide is 1: (0.03 to 0.04 ), dissolving chitosan into the graphene oxide dispersion to obtain a graphene oxide / chitosan mixture.

[0039] Step 2, according to the volume ratio of graphene oxide / chitosan mixture: liquid paraffin: span-80 is 1: (1 ~ 1.1): (0.07 ~ 0.09), add to graphene oxide / chitosan mixture Add liquid paraffin and span-80 in turn, stir for 2-4 hours to obtain the graphene oxide / chitosan emulsified mixture; then the volume ratio of graphene oxide / chitosan emulsified mixture: formaldehyde is 1: (0.07~ 0.09), add formaldehyde to graphene oxide / chitosan emulsified mixed solution, continue to stir for 1 ~ 2h, obtain graphene oxide / chitosan ...

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Abstract

The invention relates to a graphene oxide and chitosan microsphere and a preparation method thereof. According to the technical scheme, chitosan is dissolved in a graphene oxide dispersing agent obtained through ultrasonic dispersion, and graphene oxide and chitosan mixed liquor is obtained; liquid paraffin and span-80 are sequentially added to the graphene oxide and chitosan mixed liquor, and stirring is conducted for 2-4 h; formaldehyde is added, and stirring is conducted continuously for 1-2 h; a NaOH solution and an absolute ethyl alcohol are added, stirring is conducted for 2-4 h, washing and filtering are conducted, and a graphene oxide and chitosan pre-crosslinked microsphere is obtained; on the condition that the temperature ranges from 65 DEG C to 70 DEG C, the graphene oxide and chitosan pre-crosslinked microsphere is added to an epoxy chloropropane solution, stirring is conducted for 3-5 h, washing, filtering and vacuum drying are conducted, and the graphene oxide and chitosan microsphere is obtained. According to the graphene oxide and chitosan microsphere and the preparation method thereof, the preparation technology is simple; the prepared product has the advantages of being large in particle size, good in mechanical property, prone to sedimentation, prone to be separated from water, high in chelating capacity to heavy metal ions and good in adsorption property to the heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of chitosan microspheres. In particular, it relates to a graphene oxide / chitosan microsphere and a preparation method thereof. Background technique [0002] Chromium ions exist in large quantities in industrial wastewater such as electroplating, tanning, mining, and printing and dyeing. Hexavalent chromium ions are highly toxic and are easily absorbed and accumulated by the human body. Excessive intake can cause cancer, teratogenicity and mutagenesis. The treatment methods of chromium-containing wastewater mainly include adsorption method, ion exchange method, membrane separation method, coagulation method, redox method and chemical precipitation method. Adsorption The use of new adsorbent materials to treat chromium-containing wastewater is an important research area. [0003] Among the adsorption materials used in the adsorption method, carbon-based adsorption materials (such as activated carbon, fullere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/02B01J20/28004B01J20/28019B01J2220/4806C02F1/286C02F1/62
Inventor 冯涛熊硕赵婷婷胡一敏
Owner WUHAN UNIV OF SCI & TECH
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