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Core-shell structure three-dimensional graphene composite for capacitive desalination electrode and preparation method thereof

A technology of core-shell structure and composite materials, which is applied in the direction of separation methods, chemical instruments and methods, water/sewage treatment equipment, etc., can solve the problems of unenvironmental protection of nitrogen sources and complicated preparation processes, etc., and achieve stacking suppression, high surface area, and improved The effect of specific surface area

Active Publication Date: 2017-08-25
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the complicated preparation process and the unenvironmental protection of nitrogen sources, it is still challenging to explore three-dimensional graphene materials with simple preparation process, green and high nitrogen content.

Method used

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  • Core-shell structure three-dimensional graphene composite for capacitive desalination electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Dissolve zinc nitrate hexahydrate and 2-methylimidazole with a molar ratio of 1:4 in 200 ml of methanol solution, wherein the concentration of zinc nitrate is 1.5 wt%, and the stirring speed is 350rpm / min under vigorous stirring for 12 hours, centrifuge, wash with methanol solution 2 to 3 times, and dry to obtain the metal-organic framework ZIF-8; disperse 0.2 g of the obtained metal-organic framework ZIF-8 in an aqueous solution of graphite oxide with a mass concentration of 0.1 wt%, and place it in an 80° water bath Stir evenly until dry; place the obtained three-dimensional graphene composite with core-shell structure in a tube furnace, under the protection of nitrogen with a gas flow rate of 80 mL / min, control the heating rate at 2 °C / min, raise the temperature to 800 °C, and Heat at 800 ℃ for 3 h, after cooling to room temperature, add 2M hydrochloric acid solution and stir to remove metal oxides for 12 h, after washing and drying thoroughly, the three-di...

Embodiment 2

[0023]Example 2: Dissolve zinc nitrate hexahydrate and 2-methylimidazole in a molar ratio of 1:6 in 100 ml of methanol solution, wherein the concentration of zinc nitrate is 3 wt%, and stir vigorously at a stirring speed of 400 rpm / min After 12 hours, centrifuge, wash with methanol solution for 2-3 times, and dry to obtain the metal organic framework ZIF-8; disperse 0.4 g of the obtained metal organic framework ZIF-8 in a mass concentration of 0.2wt% graphite oxide aqueous solution, at 80 ° Stir evenly in a water bath until dry; place the obtained three-dimensional graphene composite with core-shell structure in a tube furnace, under the protection of nitrogen with a gas flow rate of 100 mL / min, control the heating rate at 3 °C / min, and raise the temperature to 800 °C. Insulate at 800 °C for 3 h, after cooling to room temperature, add 2M hydrochloric acid solution and stir to remove metal oxides for 10 h, after washing and drying thoroughly, the three-dimensional graphene compo...

Embodiment 3

[0025] Embodiment 3: Zinc nitrate hexahydrate and 2-methylimidazole with a mol ratio of 1:8 are dissolved in 300 ml of methanol solution, wherein the concentration of zinc nitrate is 1 wt%, and stirring speed is 460rpm / min under vigorous stirring for 12 hour, centrifuge, wash with methanol solution 2 to 3 times, and dry to obtain the metal organic framework ZIF-8; disperse 0.8 g of the obtained metal organic framework ZIF-8 in a graphite oxide aqueous solution with a mass concentration of 0.1 wt%, and place it in an 80° water bath Stir evenly until dry; place the obtained three-dimensional graphene composite with core-shell structure in a tube furnace, under the protection of nitrogen gas with a gas flow rate of 110mL / min, control the heating rate at 4 °C / min, raise the temperature to 800 °C, and at 800 °C ℃ for 3 h, after cooling to room temperature, add 2M sulfuric acid solution and stir to remove metal oxides for 12 h, after fully washing and drying, the three-dimensional gr...

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Abstract

The invention relates to a core-shell structure three-dimensional graphene composite for a capacitive desalination electrode and a preparation method thereof. In the method, a metal organic framework serves as the core, and graphene serves as the shell; a graphite oxide solution of a certain concentration and the metal organic framework are subjected to electrostatic interaction at a certain temperature to obtain a precursor of the core-shell structure three-dimensional composite; carbonization and acid-washing are carried out to obtain the three-dimensional graphene composite; the composite, acetylene black and polytetrafluoroethylene emulsion are mixed evenly and then applied to graphite paper, and after drying, the capacitive desalination electrode is obtained. The process is fast, simple, low in cost and capable of achieving batch production. The obtained electrode has a high specific area and good electroconductibility and wettability, and has potential application prospects in capacitive desalination.

Description

technical field [0001] The invention relates to a three-dimensional graphene composite material with a core-shell structure for a capacitive desalination electrode and a preparation method thereof. Background technique [0002] The shortage of fresh water resources is one of the biggest resource crises facing the world in this century. Seawater and brackish water desalination technology, as an important way to effectively solve this crisis, has attracted widespread attention from the society. The existing desalination methods mainly include distillation and membrane methods. The distillation method has high operating temperature, high energy consumption, serious scale hazards and serious corrosion; the membrane method has strict requirements on membrane performance, high membrane damage rate and high cost. In addition, these desalination methods all have the disadvantage of high energy consumption. Even the reverse osmosis membrane method with the lowest energy consumption ...

Claims

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Application Information

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IPC IPC(8): C02F1/469
CPCC02F1/4691C02F2001/46133C02F2201/46
Inventor 张登松施利毅颜婷婷
Owner SHANGHAI UNIV
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