Abstract: Activated carbons were prepared from waste tire in two different routes. Some physical properties of thus prepared
activated carbons were measured and the characterization of their phases was done by XRD measurement. The adsorption
isotherms of methylene blue were simulated by the Langmuir and Freundlich isotherms. The Langmuir isotherms were found
to have better fitting with Qmax
values 0.227, 0.255 and 0.256 mmol/g for the activated carbons prepared in air, nitrogen,
nitrogen and steam respectively while it was 0.275 mmol/g for activated carbon impregnated with H3
PO4
. The overall reaction
was found to be pseudo-second order with the rate constant of 8.314 × 10-4
Lg/(mmolmin). The surface area of the best
prepared activated carbon was 334.2 m2
/g.