The main components and preparation of activated carbon

The main components and preparation of activated carbon

  1. Carbonization of walnut shells

 

Put the walnut shell on a piece of thick paper, smash it with a hammer, take 5~10g of the broken pieces and put it into a 30×200mm hard test tube, press the device shown in the figure, heat it with an alcohol blowtorch, and keep rotating the test tube and moving the blowtorch , So that the walnut shell fragments are evenly heated.

 

Soon you can see that water is attached to the wall of the tube, and when the amount is large, it flows onto the cotton mass. chinactivecarbon A large amount of gas escapes from the nozzle and the dark brown wood tar soaks the cotton mass. The walnut shell slag in the tube is gradually carbonized until no more gas or visible The carbon particles can be heated to incandescence to remove the alcohol lamp. After the test tube is cooled, follow the steps below to process.

 

  1. Acid treatment of carbon particles

 

Take out the carbon particles produced by dry distillation and put them into a beaker, pour into 50mL2mol/L hydrochloric acid, use an alcohol lamp to heat and boil for 15min, the solution is light yellow, discard the solution in the cup, then pour 50mL2mol/L hydrochloric acid and boil for 15min to remove the carbon particles Impurities in.

 

After cooling, filter and wash with distilled water three times, then pour the carbon particles on the filter paper into another clean beaker containing 50 mL of distilled water, boil for 15 minutes, discard the solution in the cup, and then change to new distilled water and boil it several times. The pH test paper shows that the aqueous solution is acidic at the beginning and neutral at the end. Filter the solution containing carbon particles.

 

  1. Drying of self-made activated carbon granules

 

Put the filtered wet charcoal particles into the evaporating dish, use an alcohol burner to intensify the heat, and use a glass rod to keep stirring until all the charcoal particles are dried. Do not burn the charcoal particles. coconut shell activated carbon supplier  Remove the alcohol blowtorch, cool it, and take a small amount of the activated carbon to perform the following experiment to check whether it meets the experimental requirements. Collect the activated carbon that meets the requirements in a clean, dry bottle for storage.

 

  1. Adsorption experiment of self-made activated carbon

 

Take a test tube filled with nitrogen dioxide ②, put in the newly made activated carbon particles 0.2~0.5g, close the mouth of the test tube with a rubber stopper to prevent air leakage, shake the test tube so that the carbon particles are in full contact with the gas in the tube, and place this test tube for a while After time, the color of the reddish-brown gas in the test tube gradually changed to light yellow, which proved that the activated carbon made from walnut shells had an adsorption effect.

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