Three-dimensional hierarchical porous carbon nano material and preparation method and application thereof
A carbon nanomaterial and hierarchical porous technology, applied in the field of carbon nanomaterials, can solve the problems of difficulty in obtaining a three-dimensional hierarchical structure with a large specific surface area, increased product processing costs, environmental pollution, etc., achieving easy industrial production, solving processing problems, and preparing. simple craftsmanship
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Embodiment 1
[0039] A method for preparing a three-dimensional hierarchical porous carbon nanomaterial, which specifically includes the following steps: Step (1). The biomass waste is washed with 8% dilute hydrochloric acid, deionized water and ethanol to remove impurities, and then 60 ° C Dried, set aside;
[0040] Step (2). The dried biomass waste is mechanically crushed to obtain powder, and the biomass waste powder and inorganic carbonate are fully ground and mixed at a mass ratio of 1:3 to obtain a mixed material;
[0041] Step (3). Put the above mixed material in N 2 Under protection, keep at 300°C for 2 hours for in-situ gas expansion activation, then raise the temperature to 700°C for high-temperature carbonization for 2 hours, and naturally cool to room temperature to obtain carbon materials;
[0042] Step (4). Stir the above carbon material in a dilute HCl solution with a mass fraction of 5% at 70°C for 8 h, wash repeatedly, cool to room temperature, filter, wash with deionized ...
Embodiment 2
[0045] A method for preparing a three-dimensional hierarchical porous carbon nanomaterial, specifically comprising the following steps: Step (1). The biomass waste is washed with dilute hydrochloric acid with a mass fraction of 10%, deionized water and ethanol to remove impurities, and then 60 ° C Dried, set aside;
[0046] Step (2). The dried biomass waste is mechanically pulverized to obtain powder, and the biomass waste powder and inorganic carbonate are fully ground and mixed at a mass ratio of 1:5 to obtain a mixed material;
[0047] Step (3). Under the protection of N2, keep the above mixed material at 200°C for 3 hours for in-situ gas expansion and activation, then raise the temperature to 900°C for high-temperature carbonization for 4 hours, and cool naturally to room temperature to obtain a carbon material;
[0048] Step (4). Stir the above carbon material in a dilute HCl solution with a mass fraction of 10% at 80°C for 15 h, wash repeatedly, cool to room temperature,...
Embodiment 3
[0051] A method for preparing a three-dimensional hierarchical porous carbon nanomaterial, which specifically includes the following steps: Step (1). The biomass waste is washed with 5% dilute hydrochloric acid, deionized water and ethanol to remove impurities, and then 60 ° C Dried, set aside;
[0052] Step (2). The dried biomass waste is mechanically crushed to obtain powder, and the biomass waste powder and inorganic carbonate are fully ground and mixed at a mass ratio of 1:1 to obtain a mixed material;
[0053] Step (3). Under the protection of N2, keep the above mixed material at 400°C for 1 hour for in-situ gas expansion and activation, then raise the temperature to 800°C for high-temperature carbonization for 3 hours, and naturally cool to room temperature to obtain a carbon material;
[0054] Step (4). Stir the above carbon material in a dilute HCl solution with a mass fraction of 8% at 60°C for 12 h, wash repeatedly, cool to room temperature, filter, wash with deioniz...
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