Abstract
In this study, carbon microspheres (CMSs) and magnetic carbon microspheres (MCMSs) were synthesized and applied to remove Se(IV) and Cr(VI) in Se(IV), Cr(VI), and Se(IV)-Cr(VI) coexisting systems, respectively. Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Vibrating-sample magnetometry (VSM), and X-ray diffraction (XRD) were employed to investigate the physical properties, compositions, and structures of CMSs and MCMSs. X-ray photoelectron spectroscopy (XPS) was employed to reveal the removal mechanism of Se(IV) and Cr(VI) with MCMSs. Under optimum conditions, 100% Se(IV) and 100% Cr(VI) can be removed by MCMSs in 120 min from Se(IV)-Cr(VI) coexisting system containing initial concentration of 10.0 mg/L Se(IV) and 10.0 mg/L Cr(VI). Cr(VI) was removed due to the hydrogen bonding interaction between Cr(VI) and carboxylate groups and redox reaction of Cr(VI) with alcoholic hydroxyl groups on CMSs. Besides, the Fe3O4 nanoscale particles on the surface of CMSs can form outer-sphere complexes with Cr(VI) and reduce Cr(VI) to Cr(III). Se(IV) can form precipitates with the generated Cr(III). Moreover, the Fe3O4 nanoscale particles can form inner-sphere complexes with Se(IV) and reduce Se(IV) to elemental selenium (Se0) by Fe(II).
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