Composite Magnetic Photocatalyst Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4): Hydrothermal-Roasting Preparation and Excellent Photocatalytic Activity

A new composite magnetic photocatalyst, Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4), prepared by a hydrothermal-roasting method was studied. The photocatalytic properties of Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4) were evaluated by degradation of Rhodamine B (RhB) under simulated sunlight irradiation, and the structures and properties were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible light (UV-Vis) diffuse reflectance spectra (DRS), and a vibrating sample magnetometer (VSM). The results indicated that Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4) was an orthorhombic crystal, which was similar to that observed for Bi(5)O(7)I. Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4) consisted of irregularly shaped nanosheets that were 40–60 nm thick. The most probable pore size was 24.1 nm and the specific surface area was 7.07 m(2)/g. Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4) could absorb both ultraviolet and visible light, and the energy gap value was 3.22 eV. The saturation magnetization, coercivity and residual magnetization of Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4) were 3.9 emu/g, 126.6 Oe, and 0.7 emu/g respectively, which could help Bi(5)O(7)I/Mn(x)Zn(1−x)Fe(2)O(4) be separated and recycled from wastewater under the action of an external magnetic field. The recycling experiments revealed that the average recovery rate of the photocatalyst was 90.1%, and the photocatalytic activity was still more than 81.1% after five cycles.