Kinetic study of the photodegradation of ibuprofen using tertiary oxide ZnO–Al2O3–TiO2

• Published in: Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2023-06, Vol.136 (3), p.1705-1721
• Main Authors: Castro, L. V., Manriquez, M. E., Ortiz-Islas, E., Bahena-Gutierrez, G. M.
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Physical Chemistry
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-023-02430-y

This work reported the effect of the addition of titanium on photocatalyst based on layered double hydroxide using a conventional method and then calcined at 700 °C. The characterization of the prepared LDH and the mixed oxide were carried out with X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), specific surface area by N 2 physisorption (BET), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and pH PZC analysis. The catalyst has a small particle size with a specific surface area of more than 23 m 2 /g and a valence band edge of 3.35 eV. The photoactivity of the catalyst was evaluated in the photodegradation of 2- [4- (2-methylpropyl) phenyl] propanoic acid (Ibuprofen). The catalyst as a mixture of ZnO–Al 2 O 3 –TiO 2 (ZnAlTi) obtained a photodegradation of 95% after 210 min of exposure to UV radiation (λ = 254 nm). The catalyst showed enhanced photoactivity towards IBU degradation compared to commercial TiO 2 which was used as for comparative purposes under UV radiation. The activation energy for IBU degradation at 60 ppm was reported using pseudo first order kinetics. Mass spectrometry was used to analyze the photodegradation results. Graphical abstract