Porous carbon electrode based on high-temperature pyrolysis of chitosan, and preparation method of porous carbon electrode

A porous carbon electrode, high temperature pyrolysis technology, applied in the field of water treatment, to achieve the effect of large specific surface

Inactive Publication Date: 2019-07-19
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To the best of our knowledge, there are few reports on the synthesis of porous carbons using chitosan as a raw material for CDI electrosorption.

Method used

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  • Porous carbon electrode based on high-temperature pyrolysis of chitosan, and preparation method of porous carbon electrode
  • Porous carbon electrode based on high-temperature pyrolysis of chitosan, and preparation method of porous carbon electrode
  • Porous carbon electrode based on high-temperature pyrolysis of chitosan, and preparation method of porous carbon electrode

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Experimental program
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Effect test

Embodiment 1

[0024] Preparation of porous carbon electrode of the present invention

[0025] First place 4g of chitosan white powder in a 5cm×10cm corundum boat, and raise the temperature to 350°C at a rate of 5°C / min under a nitrogen atmosphere of 200ml / min. min was lowered to room temperature 25°C, and the obtained pretreated carbon was ground for later use.

[0026] Take 2 g of the pretreated carbon obtained in (1), mix it with 4 g of potassium hydroxide (KOH) flake solids, use a mortar to grind the two solids to gray powder, transfer them to a 5 cm × 10 cm corundum boat, and mix them in 200 ml / Under a nitrogen atmosphere for 1 min, the temperature was raised to 600 / 700 / 850 / 950°C at a heating rate of 5°C / min, and then lowered to room temperature 25°C at a rate of 5°C / min after holding for 2 hours. Take out the porous carbon and add 500ml of dilute HCl solution with a concentration of 1M, stir for 30min, filter with suction, wash with 500ml of deionized water for several times, until t...

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Abstract

The invention discloses a porous carbon electrode based on high-temperature pyrolysis of chitosan and a preparation method of the porous carbon electrode, and belongs to the field of water treatment technology application. The porous carbon electrode is prepared by the steps of carbonizing the chitosan, mixing the chitosan with potassium hydroxide, and calcining a mixture at a high temperature ina nitrogen atmosphere to obtain porous carbon; uniformly mixing the porous carbon with an adhesive and a conductive agent; and pressing a mixture on a titanium net to prepare the porous carbon electrode. Compared with a common activated carbon electrode, the obtained porous carbon electrode is large in specific surface area, high in porosity and excellent in capacitive performance, large in unit electric adsorption capacity in a capacitive deionization process, high in adsorption rate and excellent in regeneration performance, and is a capacitive deionization electrode with an actual application prospect.

Description

technical field [0001] The invention relates to a porous carbon electrode based on high-temperature pyrolysis of chitosan and a preparation method thereof. The electrode is mainly used in the capacitive deionization and desalination process, and belongs to the technical field of water treatment. Background technique [0002] Capacitive deionization technology (CDI, capacitive deionization), also known as electrosorption technology, is a low-pressure, membraneless desalination process based on the principle of electric double layer capacitance. When a low voltage (<2V) is applied between the electrodes and different phases of the solution, the charges will be redistributed and arranged within a very short distance. The positively charged positive electrode will attract the negative ions in the solution (similarly, the negatively charged negative electrode will attract the positive ions in the solution), and the change of the residual charge at the interface will cause the...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/86H01G11/24C01B32/348C01B32/318
CPCC01B32/318C01B32/348H01G11/24H01G11/32H01G11/86Y02E60/13
Inventor 李克勋岑本强
Owner NANKAI UNIV
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