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Magnetic biochar (MBC) was produced by magnetite (Fe3O4) precipitation onto Douglas fir biochar (NBC) that had been generated by wet fast pyrolysis. Treating an aqueous Fe3+/Fe2+ solution with NaOH induced Fe3O4 to nucleate and deposit on NBC. The NBC and the resulting MBC were used to remove Pb2+ and Cd2+ from water. Both biochars were characterized by SEM, EDX, TEM, PZC, XRD, elemental analysis,...