A method for preparing rice husk-based activated carbon by in-situ desiliconization technology
A technology of activated carbon and rice husks, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high safety risk of strong acid-base etchants, environmental pollution by waste liquid, and high treatment costs, so as to avoid harmless treatment. The effect of simple processing and preparation process and simple process
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Embodiment 1
[0040] The rice husk is pre-carbonized in a tube furnace at 600°C for 1 hour, and then the carbonized rice husk is crushed; then the rice husk and polytetrafluoroethylene are mixed and ground at a mass ratio of 1:10, and put into an alumina ceramic crucible Then, it was processed in an alumina tube at a temperature program of 5°C / min, and reacted at 900°C for 4 hours, then cooled, taken out, and ground into powder to obtain rice husk-based activated carbon.
[0041] X-ray diffraction analysis was carried out on the rice husk directly carbonized at 600°C and the sample carbonized with PTFE. The test method is that the powder is pressed with a glass sheet, and then scanned, using a copper target, with a voltage of 40kV, a current of 40mA, and a scanning range of 5-90°.
[0042] Thermogravimetric analysis method: air atmosphere, heating rate 10°C / min, heating range: room temperature - 900°C.
[0043] Nitrogen adsorption and desorption test method: Before the test, the sample was...
Embodiment 2
[0048] The rice husk is pre-carbonized in a tube furnace at 500°C for 1 hour, and then the carbonized rice husk is crushed; the rice husk and polytetrafluoroethylene are mixed and ground at a mass ratio of 1:15, and put into an alumina ceramic crucible , and then processed in an alumina tube at a temperature program of 5°C / min, reacted at 1000°C for 2h, then cooled and taken out, and ground into powder to obtain rice husk-based activated carbon. The specific surface area of rice husk carbon obtained by this process is 1236m 2 / g.
Embodiment 3
[0050] The rice husk is pre-carbonized in a tube furnace at 700°C for 0.5h, and then the carbonized rice husk is pulverized; then the rice husk and polytetrafluoroethylene are mixed and ground at a mass ratio of 1:20, and packed into alumina ceramics Crucible, and then processed in an alumina tube at 2°C / min temperature programming, reacted at 900°C for 2h, then cooled, taken out, and ground into powder to obtain rice husk-based activated carbon. The specific surface area of rice husk carbon obtained by this process is 1512m 2 / g.
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