Q

Is there a shelf life for activated carbon?

A
Generally speaking, in theory, the storage life of activated carbon is unlimited, but in practice, due to objective reasons, the ideal storage environment does not exist.
The shelf life of activated carbon depends on the actual situation of its warehouse and the precision of its packaging. Normally, it is recommended not to exceed three years.
Q

What are the factors affecting the adsorption of activated carbon?

A
Activated carbon itself:
A. It has suitable pore size for adsorption. The ideal activated carbon is one with a large number of holes slightly larger than the adsorbate molecules. The pore size is too small to allow the adsorbent to enter; the pore size reduces the surface area per unit volume, i.e. the specific surface area is too small, which leads to the decrease of the adsorption capacity.
B. Specific surface area: It is the sum of the outer surface area of 1 gram activated carbon particles and the inner surface area of the pore in the particles. The specific surface area of activated carbon is usually 500 - 1500 square meters per gram, which can be used to express the degree of pore development. The larger the specific surface area is, the stronger the adsorption capacity of activated carbon is.
(2) External conditions: related to indoor air temperature, flow rate, pressure and concentration of harmful gases.
Temperature: Within a certain range of temperature, the higher the temperature (-30 to 40 degrees centigrade), the faster the adsorption rate will be; (Molecule's irregular movement speed will increase due to high temperature, molecular kinetic energy will increase, which will accelerate the absorption rate by activated carbon.)
Velocity of flow: The higher the velocity of indoor air flow, the faster the adsorption rate.
Pressure: The higher the pressure, the faster the adsorption rate.
Concentration of harmful gases: The higher the concentration of harmful gases, the more obvious the adsorption effect.
Q

Can activated carbon be reused through sun exposure?

A
Many manufacturers say that used activated carbon bags can be reused as long as they are exposed to the sun, and can also play an adsorptive role. Is it true or false?
In fact, this is a misunderstanding. Activated carbon adsorption mainly depends on force, the harmful substances adsorbed are difficult to desorb. Activated carbon "desorption" needs to be accomplished in specific equipment by complex process methods such as thermal regeneration, chemical elution, solvent extraction regeneration, biological regeneration, etc., which can not be achieved by sunshine. However, activated carbon in the sun can reduce moisture, which is conducive to the adsorption of harmful gases.
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