The biosorption of Brill Red 5B from an aqueous solution, using Cicca acida plant's leaves was investigated in a batch system with the influence of pH (1-6), temperature (25-35 degrees C) and initial dye concentration (10-100 mg/L). Maximum biosorption was observed at initial pH of 2.0, temperature of 30 degrees C and at the initial dye concentration of 100 mg/L. Batch biosorption kinetic was studied using the pseudo first and pseudo-second-order rate equations. From the result, it was observed that pseudo-second-order rate expression fitted the experimental data well when compared to pseudo first order kinetic model. The intra-particle diffusion coefficient (K-i) and effective diffusion coefficient (D-i) values obtained for the sorption of Brill Red 5B using C. acida plant's leaves were found to be increased with increase in initial dye concentration.