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Three-dimensional graphene composite material with core-shell structure for capacitive desalination electrode and preparation method thereof

A core-shell structure, composite material technology, applied in separation methods, chemical instruments and methods, water/sewage treatment equipment, etc., can solve the problems of complex preparation process, unenvironmental nitrogen source, etc., achieve high surface area, inhibit stacking, good The effect of the application foreground

Active Publication Date: 2021-08-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Three-dimensional graphene composite material with core-shell structure for capacitive desalination electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
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 three-dimensional graphene composite material with a core-shell structure for a capacitive desalination electrode and a preparation method thereof. The method uses metal-organic framework as the core and graphene as the shell; through the electrostatic interaction between a certain concentration of graphite oxide solution and the metal-organic framework at a certain temperature, the precursor of the three-dimensional composite material with a core-shell structure is formed; further carbonization, pickling A three-dimensional graphene composite material is obtained; the composite material, acetylene black and polytetrafluoroethylene emulsion are evenly mixed, coated on graphite paper, and dried to obtain a capacitive desalination electrode. The process of the invention is fast, simple, low in cost and can be produced in batches. The obtained electrode has high specific surface area, good conductivity 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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Patent Type & Authority Patents(China)
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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