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As the major form of antimony in the aqueous environment, the adsorption for the removal of Sb(OH) 6 - is a meaningful task. In this study, MgFe 2 O 4 -doped and iron(Ⅲ) alginate cross-linked biochar ternary composite adsorbents, Fe/(MgFeO-BC) beads, were synthesized. The typical characterization analysis showed the successful synthesis of Fe/(MgFeO-BC) beads with the significant synergistic effect on the adsorption activity of MgFe 2 O 4 , the foaming effect of BC and the dispersing effect of the bead skeleton. The adsorption experiments showed significantly increased adsorption capacity of Fe/(MgFeO-BC) compared to the comparative adsorbent with Q m = 125.65 mg/g. The adsorption was able to reach equilibrium within 350 min. At low initial Sb(OH) 6 - concentration, the adsorption of Fe/(MgFeO-BC) can still achieve the standard antimony concentration (≤0.02 mg/L), giving potential for practical applications. The introduction of MgFe 2 O 4 enhanced the adsorption capacity while imparting magnetic properties of composite beads, resulting in significant improvement in separation efficiency. The -OH in the structure of MgFe 2 O 4 is the adsorption active site of Fe/(MgFeO-BC), and the adsorption of Sb(OH) 6 - is accomplished mainly through ligand exchange and inner-sphere complexation. These results suggest that Fe/(MgFeO-BC) is a kind of promising Sb(OH) 6 - adsorbent with safe, green and recyclable properties, which provides a reference for the removal of Sb(OH) 6 - from wastewater, even at low concentrations. [Display omitted] [ABSTRACT FROM AUTHOR]