Graphene oxide (GO) was prepared from graphite via oxidative exfoliation. GO was surface functionalized using ethylene diamine and GO-NH2 was produced. EDTA (H form) was immobilized onto GO-NH2 via an amide coupling process to produce GO EDTA. Nitrogen content, FTIR, and TGA showed evidences of successful functionalization process. Pb(II), Cu(II) and Zn(II) solutions were tested for their sorption onto GO-EDTA (Na-form) in terms of sorbent mass, initial pH, contact time, metal concentration, and temperature. pH 6.0 was found optimum for metal sorption that took place via chelation. The kinetic sorption data were found to fit well pseudo second order model with better performance at a higher temperature. The activation energy (Ea) of metal adsorption was less than 40 kJ/mol indicating the occurrence of physisorption. Equilibrium sorption data followed well the Langmuir isotherm with metal uptake following the order of Pb(II) > Cu(II) > Zn(II) with better performance at a higher temperature. Adsorption capacity was 72.4, 46.5 and 28.0 mg/g at 25 oC while it was 86.2, 56.8 and 31.95 mg/g at 35 oC for Pb(II), Cu(II) and Zn(II), respectively. Metal sorption followed the order: GO-EDTA > GO-NH2 > GO. Metal sorption was found to be endothermic and spontaneous. GO-EDTA proved from this study that it is an effective sorbent for heavy metals and can be reused efficiently.