Activated carbon fiber (ACF) is a new type of functional fiber, which is made from organic fiber as precursor through different ways. As the third generation product after powdered activated carbon and granular activated carbon, ACF has the characteristics of good formability, acid and alkali resistance, good conductivity and chemical stability. It not only has large specific surface area, moderate pore size, uniform distribution and fast adsorption, Moreover, it has different forms. Active carbon fiber has unique performance characteristics in catalysis and adsorption, and its own characteristics and pore structure, pore distribution, micropore surface area and surface chemistry make it have great development value. At present, nano ACF has been widely used in chemical industry, environmental protection, radiation protection, electronic industry, medical, food health and other aspects, And more and more people pay attention to it, its application prospect is quite broad.
 
1、 Performance
 
ACF is a kind of surface nano particle with irregular structure and nano space mixed system. Its fiber diameter is fine, and its contact area with the adsorbed material is large, and it can be evenly contacted and adsorbed, so that the adsorption material can be fully utilized. Its efficiency is high, and it has various fine States such as fiber, felt, cloth and paper, and the pores directly open on the fiber surface, The diffusion path of the adsorbate to the adsorption site is short, and the surface area of the adsorbate is two orders higher than the internal surface area.
 
2、 Structure
 
ACF has a microporous structure, with a microporous radius of less than 2nm. Its pore size distribution is narrow. Special micropores are monodisperse, and the structure is composed of micropores of different sizes. The diffusion of mesopores and micropores presents a polydisperse distribution. The main reason for the difference is that there are no macropores in ACF, only a small number of transition pores, Micropores are distributed on the surface of the fiber, with fast adsorption rate. The space of ACF tow plays a role of macropore, which has a good adsorption effect on the gas-phase and liquid-phase materials. Its external specific surface area is large, and the adsorption and desorption speed is fast, which is 10-100 times of the particle size of activated carbon. With the increase of specific surface area, the uniform pore diameter of the micropores increases, and the volume of the micropores increases, After adsorption in the pores, it is filled in the pores. The specific surface area of ACF increases greatly, and the adsorption capacity is 10 times of that of granular activated carbon. ACF can adsorb low concentration waste gas or substances with high activity. ACF has small volume density, small filtration resistance, large adsorption viscosity of liquid substances, and small power loss