In this study, some activated carbons were prepared from sawdust using NaOH as an impregnating agent, a full factorial plan 2(3) was adopted to optimize and determine the interaction effects of some preparation conditions: impregnation time, impregnation temperature, and impregnation ratio. Elimination efficiency toward Erythrosine and Methylene blue in single and binary systems was selected as an optimization measure. The results showed that both impregnation ratio and ratio-temperature interaction were the most effective effects. Activated carbon AC1 prepared in optimum conditions; a time of 2 h, an impregnation temperature of 85 degrees C and an impregnation ratio of (1:1); had a high specific surface area estimated at 991 m(2).g(-1) and a maximum elimination of dyes with efficiency more than 94%, which corresponds to 104 mg.g(-1) and 72 mg.g(-1) for the MB; 90 mg.g(-1) and 65 mg.g(-1) for the E127 in both systems. Adsorption kinetics of the two dyes by AC1 were correctly described by the pseudo-second order model. As for isotherm modeling, Langmuir model seems to be the most adequate to describe the experimental data with maximum adsorption capacities 111 mg.g(-1) and 76 mg.g(-1) for MB and 100 mg.g(-1) and 71 mg.g(-1) for E127 in single and in binary systems regularly.