In this work, an approach was developed to synthesize copolymer by grafting 5-Chloromethyl-8-Hydroxyquinoline on to Cassava starch for removal of Cd(II). Characterization experiments were done by scanning electron microscopy and Fourier transform infrared analysis. The study was performed under different experimental conditions of initial metal ion concentration, adsorbent dose, time, pH and temperature. Batch adsorption experiment showed that grafted copolymer had strong adsorption capacity of 51.546, 53.191, and 55.249 mg/g at 298, 308, and 318 K for Cd(II) removal. The kinetics data were analyzed using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The pseudo-second-order model best described the adsorption of Cadmium(II) ions onto copolymer. Langmuir model fitted well and thermodynamics parameters were analyzed where results revealed that the adsorption process was a spontaneous and endothermic in nature.