Fig. 8From: A Hydrothermal Synthesis of Fe3O4@C Hybrid Nanoparticle and Magnetic Adsorptive Performance to Remove Heavy Metal Ions in Aqueous Solutiona Adsorption isotherm for Pb2+ on the Fe3O4@C sample (T = 30 °C; adsorbent dose = 400 mg L−1; Pb2+ concentration = 10–60 mg L−1). b Freundlich linear plots for adsorption isotherm of the Fe3O4@Csample on the removal of Pb2+ at 30 °CBack to article page