Graphene quantum dot composite membrane for urban sewage purification treatment as well as preparation method

A graphene quantum dot, purification technology, applied in osmosis/dialysis water/sewage treatment, sterilization/microdynamic water/sewage treatment, chemical instruments and methods, etc., can solve the problem of irreversible membrane flux and easy to breed bacteria , low water flux, etc., to achieve the effect of long service life, avoiding secondary pollution and large processing capacity

Active Publication Date: 2019-07-23
ZHEJIANG UNIV OF FINANCE & ECONOMICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, during the application process, the irreversible adsorption of pollutants on the membrane surface and in the membrane pores leads to irreversible membrane flux. Therefore, it is necessary to modify the membrane surface and combine the membrane with graphene oxide quantum dots to reduce pollution. Adsorption of substances to the membrane
However, at present, there are still many problems in the application of graphene oxide quantum dots in urban sewage purification, such as poor stability, low water flux, easy to breed bacteria, etc., resulting in poor results in practical applications.

Method used

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  • Graphene quantum dot composite membrane for urban sewage purification treatment as well as preparation method

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Embodiment 1

[0027] Embodiment 1: Composite membrane preparation one:

[0028] The base film of this embodiment is polyethylene film, the polyethylene film has a pore diameter of 50-60 nm, a thickness of about 1 mm, and a porosity of about 70%.

[0029] Before preparing the composite membrane, the basement membrane was pretreated, and poly-4-styrenesulfonic acid-maleic acid sodium salt was dissolved in deionized water to prepare a 25wt% soaking solution, and the basement membrane was placed in the soaking solution, and then soaked at 60 Heated in a water bath at ℃ for 1 hour, took out the basement film, ventilated in hot air at 30°C for 15 minutes, took it out, and air-dried naturally to obtain the pretreated basement film. The scale inhibitor is loaded on the basement membrane, which can prevent fouling and clogging of the composite membrane during the deposition process.

[0030] Graphene oxide preparation: slowly add 400ml of strong acid mixed with 98wt% concentrated sulfuric acid and ...

Embodiment 2

[0034] Embodiment 2: Composite membrane two

[0035] A polyethersulfone membrane is selected as the base membrane in this embodiment. The polyethersulfone membrane has a pore diameter of 60-70 nm, a thickness of about 1.5 mm, and a porosity of about 73%.

[0036] Before preparing the composite membrane, the basement membrane was pretreated, and poly-4-styrenesulfonic acid-maleic acid sodium salt was dissolved in deionized water to prepare a 25wt% soaking solution, and the basement membrane was placed in the soaking solution, and then soaked at 60 Heated in a water bath at ℃ for 1 hour, took out the basement film, ventilated in hot air at 30°C for 15 minutes, took it out, and air-dried naturally to obtain the pretreated basement film.

[0037] Graphene oxide preparation: slowly add 300ml of strong acid mixed with 98wt% concentrated sulfuric acid and 85wt% concentrated phosphoric acid according to the ratio of volume ratio = 9:1 to 5g graphite, then place it in a water bath and ...

Embodiment 3

[0041] Embodiment 3: Composite membrane three

[0042] The base membrane of this embodiment is a polyethersulfone membrane, the polyethersulfone membrane has a pore diameter of 60-70 nm, a thickness of about 2 mm, and a porosity of about 75%.

[0043] Before preparing the composite membrane, the basement membrane was pretreated, and poly-4-styrenesulfonic acid-maleic acid sodium salt was dissolved in deionized water to prepare a 25wt% soaking solution, and the basement membrane was placed in the soaking solution, and then soaked at 60 Heated in a water bath at ℃ for 1 hour, took out the basement film, ventilated in hot air at 30°C for 15 minutes, took it out, and air-dried naturally to obtain the pretreated basement film.

[0044] Graphene oxide preparation: slowly add 400ml of strong acid mixed with 98wt% concentrated sulfuric acid and 85wt% concentrated phosphoric acid according to the ratio of volume ratio = 9:1 to 8g graphite, then place it in a water bath and heat it to 6...

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Abstract

The invention discloses a graphene quantum dot composite membrane for urban sewage purification treatment as well as a preparation method, and belongs to the technical field of sewage treatment membranes. The composite membrane comprises a base membrane and graphene oxide quantum dots deposited on the base membrane, the graphene oxide quantum dots are doped with silver, and the graphene oxide quantum dots are a nanosheet with diameter of 5-13 nm and thickness of 1-2 nm. The preparation method of the composite membrane comprises following steps: graphene oxide is prepared after oxidation of graphene and dispersed in a silver nitrate solution, silver ions in the silver nitrate solution are reduced by an electrochemistry method, the graphene oxide quantum dots are obtained, then the grapheneoxide quantum dots are deposited on the base membrane by electrodeposition to obtain the composite membrane. The prepared composite membrane has high water flux, high anti-fouling property, high antibacterial property and better stability, and can effectively purify water in the urban sewage purification treatment and avoid secondary pollution.

Description

technical field [0001] The invention relates to the technical field of sewage treatment membranes, in particular to a graphene quantum dot composite membrane used for urban sewage purification treatment and a preparation method. Background technique [0002] Graphene is a honeycomb planar film formed by sp2 hybridization of carbon atoms. It is a quasi-two-dimensional material with only one atomic layer thickness, so it is also called monoatomic layer graphite. Its thickness is about 0.335nm, and there are different fluctuations depending on the preparation method. Usually, the height in the vertical direction is about 1nm, and the width in the horizontal direction is about 10nm to 25nm. It is all carbon crystals except diamond (zero-dimensional fullerene , one-dimensional carbon nanotubes, three-dimensional bulk graphite) basic structural unit. Graphene oxide (Graphene Oxide, GO) is a derivative of graphene with an average roughness of 0.6nm. It is a single-layer or multi-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00C02F1/44C02F1/50
CPCB01D67/0079B01D69/12B01D2325/48C02F1/44C02F1/50
Inventor 鲁仕宝高学睿曾辉李蔚邓晓军
Owner ZHEJIANG UNIV OF FINANCE & ECONOMICS
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