Description
The structure of air purification activated carbon is relatively
complicated, composed of planar layer of arranging in hexagonal
carbon atoms, these planes are not arranged entirely along the
common vertical axis, but layer and layer with an angular
displacement, is messy and irregular, such a structure called the
"whorl like structure". In the process of activation, all kinds of
carbon compounds and disordered carbon between basic
microcrystalline are cleared, created a space, the accumulations of
remaining carbon are quite loose, but the mutual coupling is quite
strong.Therefore between crystallite have many spaces with
different shape, size and certain strength. According to the
aperture size these spaces are generally divided into big pore,
mid-hole and micropore. *0% specific surface area of activated
carbon comes from micropore, its specific surface area can reach
more than ***0m2/g, and pore volume also is large, so micropore is
an important factor decided adsorption performance of air
purification activated carbon.
The adsorption characteristics of activated carbon depend on its
pore structures and the surface chemical properties, and surface
chemical properties determine the chemical adsorption of active
carbon. Activated carbon for gas adsorption includes physical
adsorption and chemical adsorption, generally both been accompanied
by simultaneous. Physical adsorption simply via attractive forces
between molecules adsorbs adsorbate on the surface of the
adsorbent. Physical adsorption is reversible, reducing adsorbent
partial pressure in the gas phase, increasing the adsorption
temperature, adsorbent quickly desorption, without changing its
chemical composition. Chemical absorption has high selectivity, and
a kind of adsorbent only has the effect to the specific substance.
Chemical adsorption is irreversible, after adsorption adsorbent has
changed the original characteristics.
Air purification activated carbon has big specific surface area,
abundant pore structure, high mechanical strength, strong
adsorption capacity, easy regeneration. It can efficaciously adsorb
methanol, ammonia, radon, benzene, xylene, exhaust gas, lampblack,
especially aromatic compound.
Widely used for purification of carbon dioxide, hydrogen, nitrogen,
chlorine hydride, ethyne, ethylene, cracking gas, inert gases,
atomic equipment; As the packing of antigas mask, poison gas
filter; For dropping off air pollutants and classification
purification of mixed gas.
