Preparation of magnetic photocatalyst nanohybrid decorated by polyoxometalate for the degradation of a pharmaceutical pollutant under solar light
2016
Bastami, Tahereh Rohani | Ahmadpour, Ali
Magnetic polyoxometalate nanohybrid was prepared by the surface modification of γ-Fe₂O₃/SrCO₃ nanoparticles with PW ₁₂ O ₄₀ ³ ⁻ polyoxometalate (POM) anions. The results of Fourier transform infrared (FTIR) and energy-dispersive X-ray (EDX) confirm the presence of POM on the surface of γ-Fe₂O₃/SrCO₃ nanoparticles. TEM results revealed the ellipsoid-like structure of nanohybrid which was 23 nm in length and 6 nm in width. The activity of the photocatalyst was investigated by the photocatalytic degradation of ibuprofen (IBP) in an aqueous solution under solar light. It was found that in comparison with the γ-Fe₂O₃/SrCO₃, the degradation of IBP after 2-h exposure to the solar light irradiation was significantly higher for POM-γ-Fe₂O₃/SrCO₃ nanohybrids. The degradation of IBP was enhanced by the addition of H₂O₂ to the air saturated solution, while the addition of NaHCO₃ and isopropanol restricted the degradation process. In the presence of H₂O₂, the Fenton photocatalyst degradation under solar light irradiation led to relatively complete degradation of IBP. Furthermore, the photocatalytic activity and magnetization properties of this magnetic photocatalyst nanohybrid provide a promising solution for the degradation of water pollutants and photocatalyst recovery. Graphical Abstract Schematic illustration for preparation of POM-γ-Fe₂O₃/SrCO₃ nanohybrid and photocatalytic reaction of IBP on POM-γ-Fe₂O₃/SrCO₃ nanohybrid.
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