Method for preparing modified activated carbon from coffee residues
A technology of activated carbon and coffee grounds, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low efficiency of activated carbon, secondary pollution, and can only purify a corner of the room, etc., to inhibit the increase of formaldehyde , large specific surface area, and the effect of reducing pollution
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[0015] A method for preparing modified activated carbon from coffee grounds includes the following steps:
[0016] (1) The dried coffee grounds are first soaked in a 0.5% sodium hydroxide solution at 70-80°C for 1-2 hours, and then placed in a small carbonization furnace to isolate the air for heating, and control the heating rate to 4-5°C / min. When the temperature is raised to 200°C, keep the temperature for 2h, then continue to heat up to 440°C at the same heating rate and keep the temperature for 1-2h, and finally cool to room temperature in the absence of air, then the carbonized material is obtained;
[0017] (2) Put the carbonized material obtained in step (1) into a mixer, and spray potassium chloride solution on it under stirring. The spray amount of potassium chloride solution is: spray 100ml potassium chloride solution per kilogram of carbonized material, The potassium chloride solution is a potassium chloride solution with a concentration of 0.5%. After spraying, stir fo...
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