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  • Title: Fast nitrate and fluoride adsorption and magnetic separation from water on α-Fe2O3 and Fe3O4 dispersed on Douglas fir biochar.
    Author: Bombuwala Dewage N, Liyanage AS, Pittman CU, Mohan D, Mlsna T.
    Journal: Bioresour Technol; 2018 Sep; 263():258-265. PubMed ID: 29753258.
    Abstract:
    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 measurements, XRD analysis, and XPS. Dispersed α-Fe2O3 and Fe3O4 particles caused magnetization and generated most adsorption sites, causing more nitrate and fluoride uptake than BC. Both nitrate and fluoride adsorption on MBC remained high over a pH range from 2 to 10. Sorption was evaluated from 298 to 318 K using the Langmuir and Freundlich isotherm models. Langmuir adsorption capacities were 15 mg/g for nitrate and 9 mg/g for fluoride, higher capacities than those reported for other biochar and iron oxide adsorbents.
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