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Preparation method of graphene oxide/amphoteric chitosan intercalation composite for sewage treatment

A technology for sewage treatment and composite materials, which is applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes. and other problems, to achieve the effect of tight integration, low water content and unique preparation process

Active Publication Date: 2013-08-14
DONGYING DAOYI BIOLOGICAL MEDICINE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem with the use of these flocculants is that the sludge obtained after treatment has a large water content (80%~100%) and is in a slurry state, which makes it difficult to reprocess the sludge in the later stage of sewage treatment.
The current treatment method is mainly to use cationic polymer flocculants and mechanical dehydration. The dehydration effect of cationic polymer flocculants is limited, and the water content can be reduced to 50-60% at most; the problem of mechanical dehydration is more difficult to operate, and the treated sewage Most of the moisture in the mud is a kind of adsorbed water, which is difficult to remove by mechanical means

Method used

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  • Preparation method of graphene oxide/amphoteric chitosan intercalation composite for sewage treatment

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Experimental program
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Effect test

Embodiment 1

[0030] Step 1: Preparation of graphene oxide:

[0031] Add 1 mass part of flake graphite, 1 mass part of sodium nitrate and 40 mass parts of concentrated sulfuric acid with a mass fraction of 98% into the reactor successively, keep the temperature at 0 ° C, and add 4 parts in 1 hour under stirring. Potassium permanganate in mass parts, then warming up to 10°C and stirring for 2 hours; heating up to 35°C, reacting for 10 hours, the color of the solution turns purple green; slowly adding 200 mass parts of deionized water to control the temperature at 70°C, Continue to react for 30 minutes, then add 400 parts by mass of deionized water, add 15 parts by mass of hydrogen peroxide with a mass fraction of 30% dropwise within 30 minutes, wait for the solution to turn golden yellow, continue to react for half an hour, centrifugal precipitation, deionized water Wash until there is no SO in the wash solution as detected by barium chloride 4 2- , adjust the pH to 7.0, and use ultrasonic...

Embodiment 2

[0039]Step 1: Preparation of graphene oxide:

[0040] Add 2 parts by mass of flake graphite, 3 parts by mass of sodium nitrate and 43 parts by mass of concentrated sulfuric acid with a mass fraction of 98% into the reactor successively, keep the temperature at 2°C, and add 5 parts by parts within 1 hour under stirring. Parts of potassium permanganate by mass, then heated up to 12°C and stirred for 2 hours; heated to 37°C, reacted for 11 hours, and the color of the solution turned purple-green; slowly added 200 parts by mass of deionized water to control the temperature at 80°C, Continue to react for 30 minutes, then add 400 parts by mass of deionized water, add 20 parts by mass of hydrogen peroxide with a mass fraction of 30% dropwise within 30 minutes, wait for the solution to turn golden yellow and continue to react for half an hour, centrifugal precipitation, deionized water Wash until there is no SO in the wash solution as detected by barium chloride 4 2- , adjust the pH...

Embodiment 3

[0048] Step 1: Preparation of graphene oxide:

[0049] Add 3 parts by mass of flake graphite, 3 parts by mass of sodium nitrate and 46 parts by mass of concentrated sulfuric acid with a mass fraction of 98% into the reactor successively, keep the temperature at 4 ° C, and add 6 parts by weight within 1 hour under stirring. The potassium permanganate of mass parts is then heated up to 15 DEG C and stirred for 2 hours; the temperature is raised to 40 DEG C and reacted for 12 hours, and the color of the solution turns purple-green; slowly add 200 mass parts of deionized water to control the temperature at 85 DEG C, Continue to react for 30 minutes, then add 400 parts by mass of deionized water, add 30 parts by mass of hydrogen peroxide with a mass fraction of 30% dropwise within 30 minutes, wait for the solution to turn golden yellow and continue to react for half an hour, centrifugal precipitation, deionized water Wash until there is no SO in the wash solution as detected by bar...

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Abstract

The invention relates to a preparation method of a graphene oxide / amphoteric chitosan intercalation composite for sewage treatment. At present, the dewatering effect of a cationic type polymeric flocculant is limited. The preparation method has the steps of oxidizing graphite by virtue of concentrated sulfuric acid, sodium nitrate and potassium permanganate to prepare graphene oxide; modifying chitosan by virtue of chloroacetic acid and a quaternization reagent to obtain amphoteric chitosan; and then under the action of ultrasonic waves, realizing intercalation compounding of the graphene oxide and the amphoteric chitosan, and carrying out dispersion to obtain a graphene oxide nanometer ion dispersion liquid. According to the preparation method, by virtue of an intercalation method, controllable dispersion of a graphene oxide sheet layer and grains is realized; as being provided with active groups of carboxyl groups, hydroxy groups, quaternary ammonium groups and the like, the surface of the graphene oxide in a dispersed state can adsorb suspended pollutants in wastewater; and the graphene oxide / amphoteric chitosan intercalation composite can be applied to wastewater treatment and has the advantages of little dosage, high efficiency and low water content of sludge, and the preparation method has the characteristics that the preparation technology is unique, equipment is easily botained, and the operation is simple.

Description

technical field [0001] The invention relates to a sewage treatment material, in particular to a preparation method of a graphene oxide / amphophoteric chitosan intercalation composite material for sewage treatment. Background technique [0002] At present, a variety of water treatment agents need to be used in various sewage treatment processes. Among them, flocculants are commonly used in sewage sludge treatment. Commonly used flocculants include polyacrylamide (cationic, anionic, nonionic), Polyaluminum chloride, polyaluminum ferric chloride, etc. The biggest problem with the use of these flocculants is that the sludge obtained after treatment has a large water content (80%~100%) and is in a slurry state, which makes it difficult to reprocess the sludge in the later stage of sewage treatment. The current treatment method is mainly to use cationic polymer flocculant and mechanical dehydration. The dehydration effect of cationic polymer flocculant is limited, and the water c...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 吕生华邱超超周庆芳
Owner DONGYING DAOYI BIOLOGICAL MEDICINE TECH CO LTD
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