Abstract

Although biochar has been intensively studied as an inexpensive adsorbent for diverse organic pollutants in aqueous solution, synchronously achieving high adsorption capacity, separability, and stability is still a challenge. Herein, we partially addressed this issue via an integrated activation and pyrolytic magnetization of sawdust hydrochar, during which the surface area of magnetic activated sawdust hydrochar (M-SDHA) increases from 1.7 to 1710 m2 g–1, and the weight loss decreases from 70 to 5% at 700 °C. Correspondingly, the maxmium adsorption capacity of M-SDHA toward tetracycline (TC) reaches 423.7 mg g–1 and remains constant at pH 5–9. Multiple characterizations show that the fine pore structure and surface functional groups of M-SDHA were maintained during the pyrolysis magnetization process, which is responsible for the high adsorption capacity. In the pyrolysis magnetization process, the FeCl3 was reduced to Fe3O4 which endowed M-SDHA with magnetism and may simultaneously improve the thermosta...

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