Modified composite biochar, preparation method and applications thereof
A biochar modification technology, which is applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of difficult recycling and low activity of biochar, and achieve increased porosity, easy recycling, and enhanced adsorption Effect
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[0039] The preparation method of modified composite biochar of the present invention comprises the following steps:
[0040] 1. Biochar pretreatment: Take fresh straw, soak it in clean water to wash off the surface sediment, and cut it into an area of about 5-10cm with scissors 2 Small pieces, washed twice with water and then washed twice with deionized water;
[0041] 2. Preparation of straw biochar: put the straw in a muffle furnace for high-temperature vacuum heating, where the temperature of the muffle furnace is set at 400-600°C, and the heating time is 30min-4h; wash the ash with deionized water, and filter until the filtrate is clear Transparent, dry at 105°C to constant weight to prepare straw biochar, crush it with a pulverizer to obtain powdery biochar, sieve the material with a 80-160 mesh standard sample sieve, take the undersieve and seal the bag for later use ; In this step, the straw is pyrolyzed under oxygen-limited or anoxic conditions (T<700°C) to obtain s...
Embodiment 1
[0049] Take fresh straw, soak it in clean water to wash off the sediment on the surface, and cut it into an area of about 5-10cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water; the straw was placed in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace was set at 400°C, and the heating time was 2 hours; the straw was washed with deionized water Remove ash, filter with suction until the filtrate is clear and transparent, dry at 105°C to constant weight to prepare straw biochar, crush it with a pulverizer to obtain powdery biochar, sieve the material with a 100-mesh standard sample sieve, and take the sieve biochar. Seal the bag for later use; take 50g of potassium hydroxide and dissolve it in 1L of deionized water to prepare a potassium hydroxide solution with a concentration of 50g / L; weigh 40g of straw biochar into an Erlenmeyer flask and add 600mL of it to a conce...
Embodiment 2
[0052] Take fresh straw, soak it in clean water to wash off the sediment on the surface, and cut it into an area of about 5-10cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water; the straw was placed in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace was set at 500 °C, and the heating time was 4 hours; the straw was washed with deionized water Remove ash, filter with suction until the filtrate is clear and transparent, dry at 105°C to constant weight to prepare straw biochar, crush it with a pulverizer to obtain powdery biochar, sieve the material with a 100-mesh standard sample sieve, and take the sieve biochar. Seal the bag for later use; take 80g of potassium hydroxide and dissolve it in 2L of deionized water to prepare a potassium hydroxide solution with a concentration of 40g / L; weigh 30g of straw biochar into an Erlenmeyer flask and add 1500mL of it to a con...
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