We know that activated carbon has the function of adsorbing toxic and harmful gases. Most people who have used it also know that the principle of adsorption of harmful carbon by activated carbon is physical adsorption.
Since it is physical adsorption, the activated carbon will also reach a saturation state, so how to reactivate the activated carbon at this time? Let activated carbon restore its adsorption capacity?
Activated carbon requires four steps in the initial activation process: drying process, pre-carbonization process, carbonization process, and calcination process.
The temperature required for these four processes is: the temperature of the drying process is controlled at 150 degrees; the temperature of the pre-carbonization process needs to be increased to about 275 degrees; the carbonization process needs to reach about 400 degrees; the calcination process requires 500 degrees.
It can be seen from the process of initial activation of activated carbon that activation of activated carbon requires a certain high temperature. Now let’s introduce a relatively simple method of reactivation of activated carbon.
Simple method: place the activated carbon in the sun for exposure. This process also uses the principle of high temperature, but the temperature in the sun will not be too high, so this method can not completely restore the activated carbon with adsorption function, but the operation is simple, and it is widely used. This method can restore 60% Adsorption function around. The principle adopted by this method is that when the temperature of activated carbon rises in the sun, the gas molecules in its pores run faster, so that it can get rid of the adsorption of activated carbon molecules and run out of the pores.
If you want the adsorption function of activated carbon to achieve the initial effect, it needs a more complicated method. Complex method: We have sealed the activated carbon that has been used for many years and put it in a vacuum furnace, then slowly raise the temperature in the vacuum furnace. When the temperature rises to 500 degrees, it will maintain this temperature for a period of time, and then slowly cool down. At room temperature where we are, and then pressurize the vacuum furnace to below normal pressure, it can be taken out. At this time, the adsorption capacity of activated carbon has reached the new initial activation effect. The principle of the complex method is the same as that of the simple method, except that the temperature will be higher, and the harmful gases are immediately pumped away by the vacuum pump, so this method of reactivation is more thorough.