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Graphene oxide-based composite membrane for treating radioactive wastewater

A radioactive wastewater and graphene composite technology, which is applied in the fields of radioactive purification, radioactive pollutants, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption, high operation and maintenance costs, and limited application potential of the evaporation concentration method. , to achieve the effect of stable separation performance, easy operation and simple preparation process

Inactive Publication Date: 2016-06-15
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first four traditional treatment methods are mature in technology and widely used, but there are also obvious deficiencies in practical applications: such as evaporation and concentration method consumes a lot of energy, the operating environment is harsh, and the cost of operation and maintenance is high; The waste liquid and sediment need to be treated twice; the cost of ion exchange method is high, the adsorption capacity is low, and the waste resin generated needs to be properly treated; the application potential of adsorption method is also limited due to the price of adsorption materials and stable performance. limit
However, there is still no report in the literature on the use of graphene oxide as a membrane separation material to treat radioactive wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A graphene oxide-based composite membrane is prepared on a flake-shaped porous anodized aluminum oxide support (AAO, with an average pore diameter of 20 nm) by the method of the present invention.

[0030](1) Soak the carrier in a 0.2mM γ-aminopropyltrimethoxysilane / ethanol solution at room temperature for 2 hours, then take out the porous carrier, heat-treat it at 120°C for 1 hour, and set aside.

[0031] (2) After the graphene oxide was stirred and dispersed in water, 10 mM Tris-HCl buffer was added to adjust the pH value to 8.5, and ultrasonically dispersed for 1 hour to finally form a uniform dispersion of graphene oxide at 0.5 mg / mL. Add dopamine hydrochloride solution (graphene oxide / dopamine=3, mass ratio) to the aforementioned dispersion liquid, stir and react at 50°C for 3 hours, and dry at 50°C after several centrifuges to obtain polydopamine / oxidized Graphene composite.

[0032] (3) Mix the above polydopamine / graphene oxide complex with water, and make a 0.1...

Embodiment 2

[0037] Adopt the method of the present invention on tubular porous alumina carrier (Al 2 o 3 , with an average pore size of 1000 nm) to prepare graphene oxide-based composite membranes.

[0038] (1) Soak the carrier in a solution of γ-(2,3-glycidoxy)propyltrimethoxysilane / ethanol with a concentration of 0.2mM for 2 hours at room temperature, then take out the porous carrier, and heat it at 150°C Heat treatment under conditions for 0.5 hours, and set aside.

[0039] (2) After stirring and dispersing graphene oxide in water, add 10 mM Tris-HCl buffer solution, adjust the pH value to 8.5, ultrasonically disperse for 0.5 hours, and finally form a uniform dispersion of graphene oxide at 0.1 mg / mL. Add dopamine hydrochloride solution (graphene oxide / dopamine=5, mass ratio) to the aforementioned dispersion liquid, stir and react at 80°C for 2 hours, and dry at 40°C after several centrifuges to obtain polydopamine / dopamine Graphene composite.

[0040] (3) Mix the above polydopamin...

Embodiment 3

[0044] The graphene oxide-based composite membrane is prepared on a sheet-shaped porous polycarbonate carrier (average pore diameter: 200 nm) by using the method of the present invention. As described in Example 1, the preparation process is basically the same, only the mass ratio of graphene oxide / dopamine is adjusted to 1. Characterization methods such as XRD determined that the nanochannel size of the graphene oxide composite film was about 0.40 nm. The separation performance of the prepared composite membrane was tested, and the results showed that the permeation flux of the membrane was 5.8L / m for the wastewater solution containing radionuclide ion concentration of 0.1mg / L 2 h, where Cs + Ion rejection rate is 78.12%, Sr 2+ Ion rejection rate is 85.35%, Eu 3+ Ion rejection rate is 99.92%, Th 4+ The ion rejection rate is 99.95%.

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Abstract

The invention relates to a graphene oxide-based composite membrane for treating radioactive wastewater and a preparation method thereof.According to the membrane, a porous carrier is pre-modified through a silane coupling agent, and the graphene oxide-based composite membrane is prepared from a polydopamine and graphene oxide compound by adopting a vacuum filtration method.The method is characterized in that a polydopamine bionic self-assembly technology and a graphene oxide sheet are compounded, the size dimension of a membrane nanochannel is accurately adjusted, the selectivity or the rejection rate of the membrane on radionuclide ions is increased, and concentration and removal of radionuclide are achieved.According to the graphene oxide-based composite membrane for treating the radioactive wastewater and the preparation method thereof, the preparation process is simple and easy to operate, good repeatability is achieved, the water flux and ion rejection rate of the composite membrane are significantly increased, the separating property of a long-time operating membrane is stable, and a wide application prospect in the fields such as membrane-method radioactive wastewater treatment and heavy metal wastewater treatment is achieved.

Description

technical field [0001] The invention belongs to the technical field of radioactive wastewater treatment, and in particular relates to the preparation of a polydopamine / graphene oxide-based composite membrane and its application in radioactive wastewater. Background technique [0002] With the rapid development of my country's economy and the increasing demand for energy, the proportion of nuclear energy in the energy structure continues to increase. The use of nuclear energy by mankind has brought many increasingly serious problems while benefiting the world: For example, the normal operation of nuclear power plants and other nuclear facilities has produced a large amount of radioactive liquid waste, exhaust gas, and solid waste. Among them, radioactive wastewater treatment is an important environmental problem we face. [0003] At present, the commonly used radioactive wastewater treatment technologies mainly include: (1) evaporation concentration method; (2) chemical prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/60B01D69/12B01D67/00C02F1/44G21F9/04C02F101/20
CPCB01D67/0079B01D69/12B01D71/021B01D71/60C02F1/44C02F2101/006C02F2101/20G21F9/04
Inventor 张小亮李创王彩云文久利
Owner JIANGXI NORMAL UNIV
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