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.