As toxic elements of concern, Cd(II) and As(V) pose a threat to human health. In this study, a new type of magnetic adsorbent (SBNa800) was prepared using a mixture of industrial waste steel slag and ginkgo leaves to treat wastewater contaminated with Cd(II) and As(V). The maximum adsorption capacities of SBNa800 for Cd(II) and As(V) were 109.17 (pH 5, 1.82 times that of the original biochar) and 59.79 (pH 3) mg/g, respectively. Cd(II) and As(V) adsorption capacities was above 90 % at pH = 4. Cd(II) and As(V) were synergistic and competitive adsorption. The results of μ-XRF, XANES and XPS showed that Cd(II) was adsorbed by SBNa800 in the forms of Cd(OH), CdCO, CdH(AsO)·4 HO, CdCl·2.5 HO and Cd(NO). About 52.79-64.61 % As(V) was reduced to As(III) by Fe(0) on SBNa800 and then adsorbed. The adsorption mechanisms of Cd(II), As(V) and As(III) were hydrogen bonding/electrostatic attraction, inner-sphere complexation and precipitation. The saturation magnetisation of SBNa800, which was easy to separate from wastewater, was 6.54 emu/g. Therefore, SBNa800 can be used as a potential adsorbent to treat wastewater contaminated with Cd(II) and As(V).
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