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Preparation method of capacitive type desalination electrode prepared from hierarchical porous carbon material with core-shell structure

A technology of hierarchical porous, core-shell structure, applied in separation methods, dispersed particle separation, seawater treatment, etc., can solve problems such as low degree of graphitization

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

The nanoporous carbon material prepared by ZIF-8 alone has a relatively high nitrogen content and a large surface area, but the carbon in the material is in an amorphous state with a low degree of graphitization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve zinc nitrate hexahydrate and 2-methylimidazole with a molar ratio of 1:2 in 400ml of methanol solution, stir mechanically for 30 minutes at a stirring speed of 350rpm / min and mix well, then centrifuge and wash with methanol solution 2~3 times , followed by drying at 80°C to obtain the metal-organic framework ZIF-8.

[0019] The obtained metal-organic framework ZIF-8 was prepared as a methanol solution with a mass concentration of 0.62wt% ZIF-8, and the milky white solution was obtained by ultrasonic mixing and stirring, and then 2-methylimidazole and cobalt chloride hexahydrate were mixed in a molar ratio of 1: After slowly adding 0.06 to the methanol solution of ZIF-8, continue to stir for 5-10 minutes, heat in water at 100°C for 12 hours, centrifuge and wash with methanol 2-3 times to obtain ZIF-8ZIF-67 composite material. After drying ZIF-8ZIF-67 at 80°C, place it in a tube furnace. Under the protection of nitrogen gas with a gas flow rate of 90mL / min, contr...

Embodiment 2

[0022] Dissolve zinc nitrate hexahydrate and 2-methylimidazole with a molar ratio of 1:2.6 in 450ml of methanol solution, and stir mechanically for 40 minutes at a stirring speed of 400rpm / min to mix evenly, then centrifuge and wash with methanol solution for 2-3 times , followed by drying at 80°C to obtain the metal-organic framework ZIF-8.

[0023] The obtained metal-organic framework ZIF-8 was prepared as a methanol solution with a mass concentration of 0.65wt% ZIF-8, and the milky white solution was obtained by ultrasonic mixing and stirring, and then 2-methylimidazole and cobalt chloride hexahydrate were mixed in a molar ratio of 1: 0.07, slowly added to the methanol solution of metal-organic framework ZIF-8, continued to stir for 5-10 minutes, heated at 100°C for 12 hours, centrifuged, and washed with methanol 2-3 times to obtain ZIF-8ZIF-67 composite material. After drying ZIF-8ZIF-67 at 80°C, place it in a tube furnace. Under the protection of nitrogen gas with a gas f...

Embodiment 3

[0026] Dissolve zinc nitrate hexahydrate and 2-methylimidazole with a molar ratio of 1:3 in 500ml of methanol solution, and stir mechanically for 60 minutes at a stirring speed of 460rpm / min to mix evenly, then centrifuge and wash with methanol solution 2~3 times , followed by drying at 80°C to obtain the metal-organic framework ZIF-8.

[0027] The obtained metal-organic framework ZIF-8 was prepared as a methanol solution with a mass concentration of 0.7wt% ZIF-8, and the milky white solution was obtained by ultrasonic mixing and stirring, and then 2-methylimidazole and cobalt chloride hexahydrate were mixed in a molar ratio of 1: 0.08, slowly added to the methanol solution of ZIF-8, continued to stir for 5-10 minutes, heated in water at 100°C for 12 hours, centrifuged and washed with methanol 2-3 times to obtain ZIF-8ZIF-67 composite material. After drying ZIF-8ZIF-67 at 80°C, place it in a tube furnace. Under the protection of nitrogen gas with a gas flow rate of 130mL / min, ...

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Abstract

The invention relates to a preparation method of a capacitive type desalination electrode prepared from a hierarchical porous carbon material with a core-shell structure, which belongs to the technical field of a manufacturing process of the capacitive type desalination electrode. The preparation method comprises the following steps of firstly, adding another kind of metal ion and an organic ligand into one kind of metal organic framework solution to obtain a uniform mixed solution; crystallizing the uniform mixed solution at a high temperature to obtain a metal organic framework compound with the core-shell structure, wherein the compound has a geometric shape similar to that of a pure metal organic framework compound crystal; performing high-temperature calcining and reaction of an aqueous solution of hydrofluoric acid to remove metal oxides and obtain the hierarchical porous carbon material with the core-shell structure; uniformly mixing and then smearing a composite material, acetylene black and a polytetrafluoroethylene emulsion on graphite paper, and drying to prepare the capacitive type desalination electrode. The preparation method disclosed by the invention has the advantages of simplicity in operation, easily-controlled conditions and capability of synthesizing in a large batch; the prepared electrode has high specific surface area, good conducting property and wetting property as well as a potential application prospect in the aspect of capacitive type desalination.

Description

technical field [0001] The invention relates to a method for preparing a capacitive desalination electrode of hierarchically porous carbon material with a core-shell structure. The desalination electrode prepared by the invention has the desalination performance of high efficiency and low energy consumption. It belongs to the technical field of electric desalination electrode manufacturing technology. The invention can be applied to the desalination of seawater and brackish water, and provides a new approach for desalination with low energy consumption, low cost and high performance. 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 distill...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F103/08
Inventor 张登松施利毅王卓颜婷婷张剑平
Owner SHANGHAI UNIV
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