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
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[0021] Example 1
[0022] The PET waste was pre-oxidized in an air atmosphere at 400°C for 8 hours, and the obtained pre-oxide was mixed with melamine in a mass ratio of 1:3. The resulting mixture was increased to 500 at a temperature rise rate of 5°C / min at room temperature under 9 L / h of argon atmosphere Carbonized at ℃ for 3 h. Then the carbonized product is 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 then switched to 9 L / h of CO 2 Constant temperature in activated gas for 4 h. After the activation is completed, 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.
Example Embodiment
[0023] Example 2
[0024] The PET waste was pre-oxidized in an air atmosphere at 250°C for 48 h, and the obtained pre-oxide and ammonium phosphate were mixed in a mass ratio of 1:8. The resulting mixture was increased to 400 at a temperature increase rate of 2°C / min at room temperature under a nitrogen atmosphere of 3 L / h Carbonized at ℃ for 5 h. Then the carbonized product is 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 then switch to 3 L / h of H 2 Constant temperature in O activated gas for 6 h. After the activation is completed, switch to nitrogen at 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.
Example Embodiment
[0025] Example 3
[0026] The PET waste was pre-oxidized in an air atmosphere at 300°C for 24 h, and the obtained pre-oxide was mixed with dicyandiamine at a mass ratio of 1:1. The resulting mixture was carbonized at a temperature of 5°C / min to 550°C for 2 h at room temperature under a 6 L / h helium atmosphere. Then the carbonized product is heated to an activation temperature of 400°C at a helium flow rate of 6 L / h and a heating rate of 5°C / min, and then switched to 6 L / h of O 2 Constant temperature for 1 h in activated gas. After the activation is completed, switch to helium gas 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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