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Preparation method of three-dimensional graphene-based membrane capacitive deionization electrode

A graphene and membrane capacitor technology, applied in separation methods, dispersed particle separation, seawater treatment and other directions, can solve problems such as the inability to effectively increase the desalination amount, the carbon nanotubes are easy to agglomerate and the specific surface area, and achieve easy operation, simple preparation process, Effective desalination capacity and effect of

Active Publication Date: 2015-12-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that carbon nanotubes are easy to agglomerate and have a small specific surface area, the desalination capacity cannot be effectively improved when used as a membrane capacitor electrode material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Ultrasonically disperse polystyrene balls in a certain amount of water (solid content: 8wt%), and then drop them into a certain amount of graphite oxide aqueous dispersion (concentration: 1mg / mL). The mass ratio is 1:3, ultrasonically mixed evenly, self-assembled after suction filtration, freeze-dried for 24 hours, and the product is placed in a tube furnace, under the protection of pure nitrogen, the heating rate is controlled to 1 o C / min, the gas flow rate is 100mL / min, the temperature is raised to 550°C, and the temperature is kept for 3h to obtain three-dimensional graphene; weigh 0.1g of three-dimensional graphene into a three-necked flask, add 60mL concentrated nitric acid and 20mL deionized water, and store at 90°C Stir under reflux for 3 hours, cool to room temperature, perform suction filtration, wash with deionized water until neutral, and dry at 60° C. for 12 hours to obtain activated three-dimensional graphene. Dissolve 2.1g of p-aminobenzenesulfonic acid i...

Embodiment 2

[0025] Ultrasonic disperse polystyrene balls in a certain amount of water (solid content: 8wt%), and then drop them in a certain amount of graphite oxide aqueous dispersion (concentration: 1mg / mL), the mass of polystyrene balls and graphite oxide The ratio is 1:5, ultrasonically mixed evenly, self-assembled after suction filtration, freeze-dried for 24 hours, and the product is placed in a tube furnace. Under the protection of pure nitrogen, the heating rate is controlled to 1 o C / min, the gas flow rate is 100mL / min, the temperature is raised to 650°C, and the temperature is kept for 2h to obtain three-dimensional graphene; weigh 0.1g of three-dimensional graphene into a three-necked flask, add 40mL concentrated nitric acid and 20mL deionized water, and store at 70°C Stir under reflux for 2 hours, cool to room temperature, filter with suction, wash with deionized water until neutral, and dry at 60° C. for 12 hours to obtain activated three-dimensional graphene. Dissolve 2.1g o...

Embodiment 3

[0030] Ultrasonically disperse polystyrene balls in a certain amount of water (solid content: 8wt%), and then drop them into a certain amount of graphite oxide aqueous dispersion (concentration: 1mg / mL). The mass ratio is 1:8, ultrasonically mixed evenly, self-assembled after suction filtration, freeze-dried for 24 hours, and the product is placed in a tube furnace. Under the protection of pure nitrogen, the heating rate is controlled to 1 o C / min, the gas flow rate is 100mL / min, the temperature is raised to 750°C, and the temperature is kept for 1h to obtain three-dimensional graphene; weigh 0.1g of three-dimensional graphene into a three-necked flask, add 60mL concentrated nitric acid and 20mL deionized water, and store at 50°C Stir under reflux for 2 hours, cool to room temperature, filter with suction, wash with deionized water until neutral, and dry at 60° C. for 12 hours to obtain activated three-dimensional graphene. Dissolve 2.1g of p-aminobenzenesulfonic acid in 5wt% ...

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Abstract

The invention relates to a preparation method of a three-dimensional graphene-based membrane capacitive deionization electrode, which belongs to the technical field of membrane capacitive deionization electrode manufacturing processes. With electropositive polystyrene spheres as a template, and by adopting the method of vacuum filtration-assisted self-assembly, the method obtains three-dimensional graphene through freeze drying and high-temperature calcination, and the three-dimensional graphene is then activated by concentrated nitric acid, and aryl diazonium salt and 3-amino propyl-triethoxysilane are respectively used for sulfonating and aminating the activated three-dimensional graphene, and thereby the three-dimensional graphene has ionic selectivity, and can effectively increase the deionization performance and electrode regeneration performance when used in membrane capacitive deionization. The process of the preparation method is fast and simple, and the cost is low; the three-dimensional graphene-based membrane capacitive deionization electrode can be applied in the desalination of seawater and bitter salt water, and a new approach is provided for low-energy-consumption, low-cost and high-performance desalination.

Description

technical field [0001] The invention relates to a method for preparing a capacitive desalination electrode based on a three-dimensional graphene-based membrane, and belongs to the technical field of manufacturing process of a capacitive desalination electrode. The desalination electrode prepared by the invention has high efficiency and low energy consumption desalination performance, can be applied to the desalination of seawater and brackish water, and provides a new way for low energy consumption, low cost and high performance desalination. Background technique [0002] In recent years, due to increasing population and increasingly severe environmental pollution, water shortage has become a huge challenge for us. To solve this problem, we must find a low-cost, low-energy, environmentally friendly and non-polluting method to desalinate seawater . Capacitive desalination technology is an effective way to desalinate seawater or brackish water, but the traditional capacitive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F103/08
Inventor 张登松施利毅刘佩英颜婷婷张剑平
Owner SHANGHAI UNIV
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