Investigation of the ability of activated carbon (AC) adsorption from modification of palm oil shells by coating magnetite (Fe3O4) particles to Cd(II) ions in solution was studied through a series of adsorption experiments with a bacth method. The activated carbon adsorbents (PPAC-P) and the activated carbon-magnetite (PPAC-MnPs) were characterized by Fourier transform spectrometer to identify the functional groups, X-ray diffraction to study the level of material crystallization, scanning electron microscopy-energy-dispersive X-ray analysis to analyze the surface morphology of material and element constituents, as well as Brunauer-Emmett-Teller analyzer to analyze the surface areas of the adsorbents. The concentrations of Cd(II) ions in the solution were determined using atomic absorption spectrophotometer. The adsorption process of Cd(II) ions by PPAC-P and PPAC-MnPs was optimum at pH 6 and 7 with contact time of 90 minutes, respectively. The adsorption kinetics of Cd(II) ions in PPAC-P and PPAC-MnPs have a tendency to follow the pseudo second-order kinetics model and the Freundlich adsorption isotherm model with a value of R2 > 0.99. These suggested that the adsorption process of the Cd(II) ions on PPAC-P and PPAC-PMnPs were described as heterogeneous adsorption. PPAC-PMnPs adsorbents can be used repeatedly with % Cd(II) ions adsorbed almost constant for 4 cycles with adsorption efficiency > 80%.