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Graphene oxide/chitosan porous composite microspheres and preparation method as well as application thereof

A technology of porous composite microspheres and chitosan, applied in the application and preparation of anionic dyes, the field of graphene oxide/chitosan porous composite microspheres, can solve the limitations of chitosan material application and chitosan mechanical strength Low, prone to breakage and other problems, to achieve the effect of reducing the preparation process time, facilitating storage and transportation, and facilitating production

Inactive Publication Date: 2016-06-08
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan has low mechanical strength and is prone to breakage under acidic conditions, which limits the application of chitosan materials in wastewater treatment

Method used

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  • Graphene oxide/chitosan porous composite microspheres and preparation method as well as application thereof
  • Graphene oxide/chitosan porous composite microspheres and preparation method as well as application thereof
  • Graphene oxide/chitosan porous composite microspheres and preparation method as well as application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of graphene oxide / chitosan porous composite microspheres, specifically comprising the steps of:

[0041] 1) Add chitosan to the acetic acid solution, stir and mix for 2 hours, then add graphene oxide-water mixed solution, stir and mix in a water bath at 55°C for 1 hour to obtain a graphene oxide / chitosan mixed solution; graphene oxide / chitosan In the sugar mixed solution, the mass fraction of acetic acid is 1%, the concentration of chitosan is 1.0wt%, the quality of acetic acid and chitosan is 1g, and the graphene oxide-water mixed solution of 1mg / mL is 0.5ml;

[0042] 2) Inhale the obtained graphene oxide / chitosan mixed solution into a syringe, drop it into a 3.0wt% NaOH solution at an injection speed of 1ml / min, solidify for 12h, and wash it with deionized water until neutral;

[0043] 3) Pre-freezing with liquid nitrogen, and then vacuum-drying in a freeze dryer at -53°C for 12 hours to obtain porous microspheres with a particle size of 3-4 mm wi...

Embodiment 2

[0045] A preparation method of graphene oxide / chitosan porous composite microspheres, specifically comprising the steps of:

[0046] 1) Add chitosan to the acetic acid solution, stir and mix for 2 hours, then add graphene oxide-water mixed solution, stir and mix in a water bath at 55°C for 1 hour to obtain a graphene oxide / chitosan mixed solution; graphene oxide / chitosan In the sugar mixed solution, the mass fraction of acetic acid is 1%, the concentration of chitosan is 1.0wt%, the quality of acetic acid and chitosan is 1g, and the graphene oxide-water mixed solution of 1mg / mL is 1ml;

[0047] 2) Inhale the obtained graphene oxide / chitosan mixed solution into a syringe, drop it into a 3.0wt% NaOH solution at an injection speed of 1ml / min, solidify for 12h, and wash it with deionized water until neutral;

[0048] 3) Pre-freezing with liquid nitrogen, and then vacuum-drying in a freeze dryer at -53°C for 12 hours to obtain porous microspheres with a particle size of 3-4 mm with a...

Embodiment 3

[0050] A preparation method of graphene oxide / chitosan porous composite microspheres, specifically comprising the steps of:

[0051] 1) Add chitosan to the acetic acid solution, stir and mix for 2 hours, then add graphene oxide-water mixed solution, stir and mix in a water bath at 55°C for 1 hour to obtain a graphene oxide / chitosan mixed solution; graphene oxide / chitosan In the sugar mixed solution, the mass fraction of acetic acid is 1%, the concentration of chitosan is 1.0wt%, the quality of acetic acid and chitosan is 1g, and the graphene oxide-water mixed solution of 1mg / mL is 2ml;

[0052] 2) Inhale the obtained graphene oxide / chitosan mixed solution into a syringe, drop it into a 3.0wt% NaOH solution at an injection speed of 1ml / min, solidify for 12h, and wash it with deionized water until neutral;

[0053] 3) Pre-freezing with liquid nitrogen, and then vacuum-drying in a freeze dryer at -53°C for 12 hours to obtain porous microspheres with a particle size of 3-4 mm with...

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Abstract

The invention discloses a preparation method of graphene oxide / chitosan porous composite microspheres. The preparation method of the graphene oxide / chitosan porous composite microspheres comprises the following steps of (1), uniformly dispersing chitosan and graphene oxide in an acetic acid solution to obtain a graphene oxide / chitosan solution; (2), dropwise adding the graphene oxide / chitosan solution into a sodium hydroxide solution to solidify an obtained mixture into the microspheres, cleaning the microspheres to be neutral by using deionized water, and carrying out freeze drying on the microspheres to obtain the graphene oxide / chitosan porous composite microspheres. The microspheres prepared by the preparation method are controllable and uniform in size and appearance; a carboxyl group on the graphene oxide interacts with an amino group on the chitosan, so that a honeycomb structure of the chitosan is assembled together with a porous layer structure of the graphene oxide layer by layer; meanwhile, the graphene oxide also plays the role of a cross-linking agent; the strength of the composite microsphere is improved; the microsphere which is favorable in performance is obtained, and can be applied to the adsorption treatment of dye wastewater.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a graphene oxide / chitosan porous composite microsphere, a preparation method and its application in absorbing anionic dyes in wastewater. Background technique [0002] With the rapid development of industry, a large amount of waste water will be produced in the production process of printing and dyeing, paper making, leather making, electroplating, etc. The waste water contains dyes, heavy metals, proteins, salts, oils, sulfides and other substances harmful to the environment. Treatment of dye-containing wastewater is a tricky business. The dye has strong chemical stability and is not easy to biodegrade; the dye reduces the light transmittance of water, interferes with the photosynthesis of aquatic organisms, and inhibits the growth of aquatic organisms; and some dyes contain carcinogens, which can migrate through the food chain. It will have extremely se...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/20B01J20/24B01J20/28021C02F1/288C02F2101/308
Inventor 郑学晶李潇潇闫婷婷裴莹刘捷汤克勇
Owner ZHENGZHOU UNIV
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