Polyaniline which is coated onto sawdust prepared from fruit of the gardening plant material Cordia Sebestena is used as an adsorbent (PAn/SD) for removing acidic (Acid Orange 7) and basic (Basic Red 29) dyes from aqueous solutions. Batch mode adsorption study was performed to investigate the effects of the main parameters such as contact time, pH, initial dye concentration and temperature. Using the prepared adsorbent, various kinetic studies and isotherm studies were employed to analyze the feasibility and mechanism of adsorption of both the dyes. The kinetic study obeys pseudo second order and the isotherm study fits with Freundlich model for both acidic and basic dyes. The percentage removal of Acid Orange 7 onto the adsorbent PAn/SD decreases from 87.18% to 78.13% and for Basic Red 29, it decreases from 84.40% to 76.08% with the increase in initial dye concentration from 25 mg/L to 100 mg/L at 30º C. Thermodynamic parameters like ΔGº, ΔHº and ΔSº were also evaluated for both the dyes. It was found that the chemical modification of the fruit of the gardening plant material waste such as sawdust coated onto polyaniline can be used as the best adsorbent for the removal of acidic and basic dyes.