Generation and entrance of toxic materials to aqueous environment causes many problems to human health. In the current study, the removal efficiency of Cd (II) and Ni(II) from aqueous solution was investigated by carbonaceous magnesium oxide. Three types of C-MgO adsorbents were synthesized via pyrolysis of prepared magnesium complex Mg(acac)2 at three temperatures. Fabricated C-MgO adsorbents were characterized by XRD, SEM, and BET. XRD results revealed that the synthesized adsorbents consist of only magnesium oxide and carbon phase without any impurities. SEM technique used to characterizes the surface morphology of C-MgO samples. N2 adsorption-desorption isotherm used to calculate the BET surface area of prepared samples. The SEM results had a good agreement with BET measurement which improved that the high temperature increase the particles size and reduce the surface area. The adsorption studies showed that the carbonaceous magnesium oxides have good removal effeciency for Cd (II) and Ni(II) removalfrom aqueous solution and kinetically follow the pseudo-second order model.