Diffusivity of microporous carbon for benzene and methyl-ethyl ketone adsorption

Kinetic studies results indicate that the pore diffusion coefficient is from 10−6 to 10−8 cm2/sec for both benzene and MEK in the temperature range of 30–120°C. Under similar adsorbate concentration, MEK exhibits an effective pore diffusion coefficient greater than benzene. This may be attributed to its smaller molecular size being a polar molecular structure attracted to the activated carbon surface. In general, the effective diffusivity of MEK was greater than benzene under the same temperature and similar concentration. The influence of influent concentration on effective diffusion coefficient at low temperature is greater than that at high temperature.