Novel Bi 2 WO 6 -coupled Fe 3 O 4 Magnetic Photocatalysts: Preparation, Characterization and Photodegradation of Tetracycline Hydrochloride.

Novel Bi2 WO6 -coupled Fe3 O4 magnetic photocatalysts with excellent and stable photocatalytic activity for degrading tetracycline hydrochloride and RhB were successfully synthesized via a facile solvothermal route. Through the characterization of the as-prepared magnetic photocatalysts by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra, it was found that the as-prepared magnetic photocatalysts were synthesized by the coupling of Bi2 WO6 and Fe3 O4 , and introduction of appropriated Fe3 O4 can improve nanospheres morphology and visible-light response. Among them, BFe2 (0.16% Fe3 O4 ) exhibited the best photocatalytic activity for degradation of tetracycline hydrochloride (TCH), reaching 81.53% after 90 min. Meanwhile, the as-prepared magnetic photocatalysts showed great separation and recycle property. Moreover, the results of electrochemical impedance spectroscopy demonstrated that the well conductivity of Fe3 O4 can promote photogenerated charge carriers transfer and inhibit recombination of electron-hole pairs, so that Bi2 WO6 /Fe3 O4 exhibited enhanced photocatalytic activity on degradation of TCH and RhB. Hence, this work provides a principle method to synthesize Bi2 WO6 /Fe3 O4 with excellent photocatalytic performance for actual application, in addition, it showed that introduction of Fe3 O4 not only can provide magnetism, but also can enhance photocatalytic activity of Bi2 WO6 /Fe3 O4 magnetic photocatalysts.