Chitosan-based porous carbon sphere and preparation method thereof
A chitosan and porous carbon technology, applied in chemical instruments and methods, carbon compounds, other chemical processes, etc., can solve the problems that limit the efficient utilization of chitosan-based carbon materials, the low efficiency of hydrothermal carbonization into spheres, and the shape of carbon materials. irregular appearance and other problems, to achieve the effects of low cost, strong physical and chemical stability, and improved porosity and specific surface area
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[0035] Example 1
[0036] A method for preparing chitosan-based porous carbon balls, the specific steps are as follows:
[0037] (1) Under the condition of a stirring rate of 600 rmp, add 0.5 g of chitosan with a molecular weight of 50000 Da to 500 mL of a 0.1 mol / L dilute hydrochloric acid solution system to dissolve it, and obtain the mass fraction (g / mL ) Is 0.1% chitosan solution;
[0038] (2) Transfer the chitosan solution prepared in step (1) to a hydrothermal reaction kettle, heat to 180 ℃, hydrothermal carbonization at a constant temperature for 8 hours, cool to room temperature after the reaction, and dialyze with a 3000 D dialysis bag. Press and dry at 30 ℃ to obtain black powder, which is chitosan-based carbon ball;
[0039] (3) According to the mass ratio of chitosan-based carbon spheres and KOH particles of 1:0.1, respectively weigh 0.25 g chitosan-based carbon spheres and 0.025 g KOH particles obtained in step (2) in an agate mortar, grind and mix Then, in a nitrogen a...
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[0041] Example 2
[0042] A method for preparing chitosan-based porous carbon balls, the specific steps are as follows:
[0043] (1) At a stirring rate of 700 rpm, add 5 g of chitosan with a molecular weight of 200,000 Da to 500 mL of a dilute hydrochloric acid solution with a concentration of 1 mol / L to dissolve it, and obtain the mass fraction (g / mL) is 1% chitosan solution;
[0044] (2) Transfer the chitosan solution prepared in step (1) to a hydrothermal reaction kettle, heat to 200 ℃, hydrothermal carbonization at a constant temperature for 12 h, cool to room temperature after the reaction, and after dialyzing with a 3000 D dialysis bag, Vacuum drying at 50 ℃ to obtain black powder, which is chitosan-based carbon ball;
[0045] (3) According to the mass ratio of chitosan-based carbon spheres and KOH particles of 1:0.5, respectively weigh 0.5 g of chitosan-based carbon spheres and 0.25 g of KOH particles obtained in step (2) in an agate mortar, grind and mix Then, in a nitrogen...
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[0047] Example 3
[0048] A method for preparing chitosan-based porous carbon balls, the specific steps are as follows:
[0049] (1) Under the condition of a stirring rate of 1000 rpm, add 20 g of chitosan with a molecular weight of 200,000 Da to 500 mL of a dilute hydrochloric acid solution system with a concentration of 2 mol / L to dissolve it to obtain a mass fraction (g / mL ) Is a 4% chitosan solution;
[0050] (2) Transfer the chitosan solution prepared in step (1) to a hydrothermal reaction kettle, heat to 250 ℃, hydrothermal carbonization at a constant temperature for 24 hours, cool to room temperature after the reaction, and dialyzed with a 3000 D dialysis bag, Freeze drying to obtain black powder, which is chitosan-based carbon ball;
[0051] (3) According to the mass ratio of chitosan-based carbon spheres and KOH particles of 1:3, respectively weigh 0.5 g of chitosan-based carbon spheres and 1.5 g of KOH particles obtained in step (2) in an agate mortar, and grind thoroughly ...
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