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Method for preparing nitrogen-doped activated carbon by utilizing PET (polyethylene terephthalate) waste material

A nitrogen-doped, activated carbon technology, used in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as environmental pollution and resource waste, and achieve reasonable pore size distribution, high specific surface area, and good electrochemical properties. Effect

Active Publication Date: 2013-05-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Followed by the generation of a large amount of PET waste every year, causing environmental pollution and waste of resources

Method used

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  • Method for preparing nitrogen-doped activated carbon by utilizing PET (polyethylene terephthalate) waste material
  • Method for preparing nitrogen-doped activated carbon by utilizing PET (polyethylene terephthalate) waste material
  • Method for preparing nitrogen-doped activated carbon by utilizing PET (polyethylene terephthalate) waste material

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Experimental program
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Effect test

Embodiment 1

[0022] PET waste was pre-oxidized at 400 °C in an air atmosphere for 8 h, and the obtained pre-oxidized material was mixed with melamine at a mass ratio of 1:3. The resulting mixture was heated to 500 °C at a rate of 5 °C / min under an argon atmosphere of 9 L / h at room temperature. ℃ carbonization for 3 h. Then, the carbonized product was heated to an activation temperature of 900°C under the conditions of an argon flow rate of 9 L / h and a heating rate of 5°C / min, and switched to 9 L / h of CO 2 Constant temperature in activated gas for 4 h. After activation, switch to argon with a flow rate of 9 L / h and cool to room temperature to obtain nitrogen-doped activated carbon. The main properties of the activated carbon are shown in Table 1.

Embodiment 2

[0024] PET waste was pre-oxidized at 250 °C in an air atmosphere for 48 h, and the obtained pre-oxidized material was mixed with ammonium phosphate at a mass ratio of 1:8. The resulting mixture was heated at a rate of 2 °C / min to 400 °C under a nitrogen atmosphere of 3 L / h at room temperature. ℃ carbonization for 5 h. Then, the carbonized product was heated to an activation temperature of 800°C under the conditions of a nitrogen flow rate of 3 L / h and a heating rate of 2°C / min, and switched to 3 L / h of H 2 O activated gas at constant temperature for 6 h. After activation, switch to nitrogen with a flow rate of 3 L / h and cool to room temperature to obtain nitrogen-doped activated carbon. The main properties of the activated carbon are shown in Table 1.

Embodiment 3

[0026] The PET waste was pre-oxidized in an air atmosphere at 300 °C for 24 h, and the obtained pre-oxidized material was mixed with dicyandiamide at a mass ratio of 1:1. The resulting mixture was carbonized at room temperature at a rate of 5 °C / min to 550 °C for 2 h in a helium atmosphere of 6 L / h. Then, the carbonized product was heated to an activation temperature of 400°C under the conditions of a helium flow rate of 6 L / h and a heating rate of 5°C / min, and switched to 6 L / h of O 2 Constant temperature in activated gas for 1 h. After activation, switch to helium with a flow rate of 6 L / h and cool to room temperature to obtain nitrogen-doped activated carbon. The main properties of the activated carbon are shown in Table 1.

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Abstract

The invention relates to a method for preparing nitrogen-doped activated carbon by utilizing a PET (polyethylene terephthalate) waste material and belongs to the technical fields of chemical industry and environmental protection. The method provided by the invention comprises that low-temperature preoxidized PET waste material and a nitrogen source are mixed, then carbonizing treatment is carried out in inert atmosphere, and activating treatment is carried out on carbonized product by adopting a physical activation method or a chemical activation method, so that the nitrogen-doped activated carbon is obtained. The method provided by the invention has the advantages that the PET waste material is taken as a carbon source, organic amine or inorganic ammonium salt is taken as the nitrogen source, and the characteristics of low production cost and simple preparation process are achieved; and the nitrogen-doped activated carbons with different nitrogen contents and specific surface areas can be prepared by controlling the ratio of the carbon source to the nitrogen source and selecting an appropriate activation method. The prepared nitrogen-doped activated carbon can serve as an electrode material, a catalyst carrier and an adsorbent. The invention provides a convenient and feasible method for utilizing the PET waste material.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped activated carbon by utilizing PET waste, and belongs to the technical fields of chemical industry and environmental protection. Background technique [0002] Polyethylene terephthalate (PET for short) is one of the main varieties of thermoplastic polyester, which is a polycondensate of terephthalic acid and ethylene glycol. PET is widely used because of its excellent properties, such as heat resistance, chemical resistance, toughness, electrical insulation, safety, etc., and is cheap, such as making fibers, films, engineering plastics, polyester bottles Wait. Followed by the generation of a large number of PET waste every year, resulting in environmental pollution and waste of resources. Therefore, the recycling of PET waste has been widely valued by relevant people at home and abroad. [0003] As the main component of synthetic polyester, PET is a high molecular polymer, which usually h...

Claims

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Application Information

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IPC IPC(8): C01B31/10C01B31/12C01B32/324C01B32/336C01B32/342C01B32/348
Inventor 周颖邱介山赵强孙利王春雷刘哲王道龙侯雨辰金新新
Owner DALIAN UNIV OF TECH
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