Chitosan-abrus precatorius blended beads were used as a biosorbing agent for the removal of Cu(II), Cd(II), Pb(II) and Ni(II) ions from aqueous solutions. The adsorption studies were conducted as a function of pH, contact time, adsorbent dosage, initial mental ion concentration and temperature. Optimum adsorption of Cu(II), Cd(II), Pb(II) and Ni(II) took place at pH values of 6.0, 4.0, 5.0 and 4.0, respectively. Further, the biosorbent was characterized by Fourier Transform Infrared Spectroscopy (FTIR) and BET Surface area analysis. The adsorption data of metal ions at the temperature of 30, 40 and 50oC are fitted to Langmuir and Freundlich isotherm models. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. Experimental data were used to predict biosorption kinetics using pseudo-first order, pseudo-second order and intraparticle diffusion kinetic models. The results showed that the biosorption processes of metal ions followed well pseudo-second order kinetics. The calculated thermodynamic parameters (ΔGo, ΔHo and ΔSo) showed that the biosorption of Cu(II), Cd(II), Pb(II) and Ni(II) onto chitosan-abrus precatorius blended beads was feasible, spontaneous and endothermic.