Preparation method and application of hemp stem core residue-based porous biochar
A technology of hemp core and biochar, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as no utilization method, reduce energy consumption, save preparation cost, and shorten pyrolysis time Effect
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Embodiment 1
[0031] A preparation method of hemp core residue-based porous biochar, comprising the following steps:
[0032] (1) Clean the residue of the hemp core with deionized water to neutrality, drain the cleaned material, dry it at 70°C for 24 hours, pulverize the dried sample, and pass it through a 60-mesh sieve;
[0033] (2) Pre-carbonization treatment: add the pulverized sample into a square quartz crucible and place it in a tube furnace. 2 Under the atmosphere at 5℃·min -1 The heating rate was heated to 450 ° C, and the temperature was kept for 60 min to obtain the pre-carbonized material;
[0034] (3) potassium hydroxide activation: fully grind 20min after mixing pre-carbonized material and KOH by 1:1 weight ratio;
[0035] (4) Pyrolysis: put the mixture in a tube furnace at 5°C·min -1 The rate at N 2 Heating to the specified temperature 500 ℃ under the atmosphere, holding for 60min;
[0036] (5) After stopping heating, cool down to room temperature, take out, rinse with 1M...
Embodiment 2
[0038] A preparation method of hemp core residue-based porous biochar, comprising the following steps:
[0039] (1) Clean the residue of the hemp core with deionized water to neutrality, drain the cleaned material, dry it at 80°C for 8 hours, pulverize the dried sample, and pass it through a 40-mesh sieve;
[0040] (2) Pre-carbonization treatment: add the pulverized sample into a square quartz crucible and place it in a tube furnace. 2 Under the atmosphere at 4℃·min -1 The heating rate was heated to 300 ° C, and the temperature was kept for 90 min to obtain pre-carbonized material;
[0041] (3) potassium hydroxide activation: fully grind 20 minutes after mixing pre-carbonized material and KOH by weight ratio of 1:3.5;
[0042] (4) Pyrolysis: put the mixture in a tube furnace at 4°C·min -1 The rate at N 2 Heated to the specified temperature of 300 ° C under the atmosphere, and kept for 90 minutes;
[0043] (5) After stopping heating, cool down to room temperature, take out...
Embodiment 3
[0045] A preparation method of hemp core residue-based porous biochar, comprising the following steps:
[0046] (1) Clean the residue of the hemp core with deionized water to neutrality, drain the cleaned material, dry it at 75°C for 12 hours, pulverize the dried sample, and pass it through a 50-mesh sieve;
[0047] (2) Pre-carbonization treatment: add the pulverized sample into a square quartz crucible and place it in a tube furnace. 2 Under the atmosphere at 10℃·min -1 The heating rate was heated to 500 ° C, and the temperature was kept for 30 min to obtain the pre-carbonized material;
[0048](3) Potassium hydroxide activation: fully grind 20 minutes after pre-carbonized material and KOH are mixed by 1:7 weight ratio;
[0049] (4) Pyrolysis: put the mixture in a tube furnace at 10°C·min -1 The rate at N 2 Heated to the specified temperature of 700 ° C under the atmosphere, and kept for 30 minutes;
[0050] (5) After stopping heating, cool down to room temperature, take...
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