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Preparation and application of MOF-derived porous carbon/graphene composite electrode material

A graphene composite, electrode material technology, applied in water/sewage treatment, water/sludge/sewage treatment, dispersed particle separation, etc. The effect of surface area, enriched mesoporous structure

Active Publication Date: 2018-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, self-agglomeration and poor conductivity limit its further development.

Method used

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  • Preparation and application of MOF-derived porous carbon/graphene composite electrode material
  • Preparation and application of MOF-derived porous carbon/graphene composite electrode material
  • Preparation and application of MOF-derived porous carbon/graphene composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

[0049] 1. Sample preparation

Embodiment 1

[0051] Sample preparation was carried out as follows:

[0052] Place the 250mL reaction flask in an ice-water bath, add 2.4mL of concentrated sulfuric acid, 0.5g K 2 S 2 o 8 and 0.5g P 2 o 5 The mixture was reacted at 80° C. for 4.5 h, and the pre-oxidized product was washed with water and dried. Then add the pre-oxidized product to 12ml of concentrated sulfuric acid, then slowly add 6g of potassium permanganate (>99.6%), control the reaction temperature not to exceed 20°C, add 25mL of deionized water, and stir in a water bath at 35°C for 2h. After 2 hours, add 70 mL of deionized water to dilute the solution, and then slowly inject 2 mL of 30% hydrogen peroxide. Bubbles gradually bulged out, and the solution was bright yellow. After stirring for 2 h, filter and wash with 10% hydrochloric acid solution and deionized water several times until the solution is neutral. The obtained graphene oxide was dispersed as a GO aqueous dispersion with a concentration of 10 mg / mL and ...

Embodiment 2

[0054] Sample preparation was carried out as follows:

[0055] Take 50mL beaker A, add 0.6488g ferric chloride and 10mL water into it and stir well. Take another 50mL beaker B, add 0.4643g fumaric acid and 10mL DMF into it and stir well. A and B were mixed and stirred evenly, transferred to a reaction kettle at 80°C for 4 hours, the precipitate was collected and washed twice with DMF and deionized water twice, and then dried in a vacuum oven at 60°C for 12 hours to obtain Fe-MOF crystals.

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Abstract

The invention discloses preparation and an application of an MOF-derived porous carbon / graphene composite electrode material. The preparation method comprises the steps as follows: (1) a clean container is taken, a graphene or graphene oxide dispersion liquid is added, then, MOFs crystal powder is added, the container is placed on a vortex mixer for continuous mixing after being sealed, the rotating speed is adjusted repeatedly from zero to the highest rotating speed, so that a sample is fully oscillated in the vertical direction, formation of a graphene sheet or graphene oxide sheet self-assembly three-dimensional structure and full and uniform dispersion of MOFs crystals in the three-dimensional frame structure are promoted, and finally, graphene / MOF porous aerogel is obtained through freeze drying; (2) the aerogel is subjected to high-temperature roasting in the N2 atmosphere and a carbonized product is obtained; (3) the carbonized product is subjected to acid treatment and the MOF-derived porous carbon / graphene composite electrode material is obtained. The MOF-derived porous carbon / graphene composite electrode material is applied in CDI or MCDI desalination and has good effects.

Description

technical field [0001] The invention relates to the preparation of a metal-organic framework (MOF)-derived porous carbon / graphene composite electrode material and its application in capacitive deionization desalination and capacitive precipitation deionization desalination. Background technique [0002] As a new desalination technology, capacitive deionization (CDI) has the advantages of high efficiency, low energy consumption, and environmental friendliness. The CDI process is to apply an electric field to two parallel and opposite porous adsorption electrodes. When the brine flows through, the anions and cations move to the positive and negative electrodes respectively under the action of the electric field, and are adsorbed on the surface of the electrodes to form an electron double layer (EDL). the process of. When the electrode reaches saturation, the electrode is short-circuited or a reverse voltage is applied, causing the ions to desorb from the electrode back into s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCC02F1/4691
Inventor 施文慧叶陈增沈江南
Owner ZHEJIANG UNIV OF TECH
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