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α-Fe2O3 and Fe3O4 dispersed on high surface area (663 m2/g) Douglas fir biochar (BC) was prepared for fast nitrate and fluoride ion removal from water using magnetic separations. This biochar, made originally at 900 °C, was impregnated with FeCl3 and converted by pyrolysis at 600 °C to magnetic (494 m2/g) biochar (MBC). MBC and its precursor BC were characterized using SEM, SEM-EDX, STEM, SBET, PZC...