Magnetic Bi2WO6 nanocomposites: Synthesis, magnetic response and their visible-light-driven photocatalytic performance for ciprofloxacin

• Published in: Chemical physics 2020-02, Vol.530, p.110614, Article 110614
• Main Authors: Song, S.Y., Chen, H.D., Li, C.X., Shi, D.S., Ying, Y., Han, Y.B., Xu, J.C., Hong, B., Jin, H.X., Jin, D.F., Peng, X.L., Ge, H.L., Wang, X.Q.
• Format: Article
• Language: English
• Subjects: Bi2WO6; Ciprofloxacin; Degradation; Magnetic separation; Photocatalytic performance
• ISSN: 0301-0104
• DOI: 10.1016/j.chemphys.2019.110614

[Display omitted] •Bi2WO6 and Fe3O4 nanoparticles were bonded and oxidized to form magnetic BWF3 and BWF2.•90% and 65% CIP could be photocatalytic degraded with BWF3 and BWF2 in 120 min.•BWF3 and BWF2 could be easily separated by external magnetic field in 1 min.•BWF3 showed the good magnetic response and photocatalytic performance to CIP. Photocatalytic Bi2WO6 and magnetic Fe3O4 nanoparticles were synthesized with hydrothermal process, and then were bonded together with polyethylene glycol and oxidized to form Fe3O4/Bi2WO6 and γ-Fe2O3/Bi2WO6 nanocomposites. The microstructure, component, magnetic response and photocatalytic degradation to ciprofloxacin (CIP) were studied with x-ray diffraction, N2 adsorption-desorption isotherms, energy dispersive spectrometer, vibrating sample magnetometer and UV/Vis spectrophotometer. Bi2WO6 nanoparticles presented the highest CIP removal of about 98% in 120 min under visible light irradiation, which was higher than that of Fe3O4/Bi2WO6 (90%) and γ-Fe2O3/Bi2WO6 (65%) nanocomposites. Both Bi2WO6-based nanocomposites could be easily separated by external magnetic field in 1 min. Fe3O4/Bi2WO6 nanocomposites showed the better synergisticeffect of magnetic response and photocatalytic performance under visible light irradiation. Moreover, the photocatalytic mechanism for magnetic nanocomposites was deduced based on the energy band theory of semiconductor heterojunction contact.