Activated carbon fiber(ACF)
Activated carbon fiber (ACF) is made of natural fiber or man-made fiber through carbonization and activation.
Its main component is carbon, which exists in the form of chaotic stacking of graphite-like microchips, and the average microchip size is very small.
The diameter of activated carbon fiber is 5~20μm, the average specific surface area is about 1000~1500m²/g, the average pore size is 1.0~4.0nm, and the micropores are evenly distributed on the surface of the fiber.
Compared with activated carbon, activated carbon fiber has small and uniform pore size, simple structure, fast adsorption rate, high adsorption rate and easy desorption for the adsorption of small molecules. The contact area with the adsorbed material is large and can be with uniform contact and adsorption, the adsorbed material can be fully utilized. High efficiency, and with fiber, felt, cloth and paper and other thin positions, the pores directly open on the surface of the fiber, the adsorption of the adsorbent to the adsorption site of the diffusion path is short, and its external area is two orders of magnitude higher than the internal surface area.
The volume density of activated carbon fiber is small, the filtration resistance is small, the adsorption of liquid substances with large viscosity is small, and the power loss is small.
Feature and advantages
Large adsorption capacity: ACF not only has obvious adsorption capacity for high concentration adsorbent, but also has excellent adsorption capacity for low concentration adsorbent. For example, when toluene gas content is lower than 10ppm, ACF can also adsorb it, and GAC must be higher than 100ppm.
Fast adsorption speed: The adsorption speed of gas is very fast, and its adsorption rate is 2-3 orders of magnitude higher than GAC.
Easy regeneration, fast desorption speed: in the process of multiple adsorption and desorption, the original adsorption performance is still maintained. If ACF is treated with hot air at 120-150ºC for 10-30 minutes, it can be completely desorbed.
Good heat resistance: high temperature resistance in inert gas above 1000 ° C, ignition point in the air above 500 ° C.
Acid and alkali resistance: good electrical conductivity and chemical stability.
Small volume density, small filtration resistance: about 1/3 of GAC can absorb liquid substances with larger viscosity, and small power loss.
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