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In this study, a novel TiO 2-x /TiN@C heterojunction was prepared using a typical hydrothermal synthesis and carbon thermal reduction approach. It was employed for photocatalytic degradation of levofloxacin antibiotics, with the formation of heterostructures and the surface plasmon resonance effect from TiN and TiO 2-x playing a crucial role in enhancing the photocatalytic activity. [Display omitted] • Porous TiO 2-x /TiN@C microdisks with abundant heterointerfaces were prepared through the process of ammonium chloride-assisted nitride pyrolysis for the photocatalytic degradation of levofloxacin. • Surface plasmon resonance induced by plasmonic TiN enhances the absorption of visible light. • The broad-spectrum absorption capability contributes to the improvement of photocatalytic performance. • The synergistic effect between photocatalysis and advanced oxidation processes enhances the efficiency of levofloxacin degradation. Semiconductor photocatalysis holds great promise as a method for addressing the issue of antibiotic pollution in water. However, the wide band gap and low carrier separation rate present significant challenges that restrict the water purification efficiency of photocatalytic materials. In this study, a novel TiO 2-x /TiN@C heterojunction was prepared through a typical hydrothermal synthesis and carbon thermal reduction approach, which was utilized for the photocatalytic degradation of levofloxacin (LEV) antibiotics. TiO 2-x contains various titanium oxides, including TiO 2 , Ti 2 O 3 , and Ti 3 O 5 , and possesses a narrow band gap, enabling efficient absorption of visible light. The visible light absorption ability is further enhanced when it forms a heterojunction with plasmonic titanium nitride, which exhibits good carrier separation ability. The results demonstrated that the degradation efficiency of TiO 2-x /TiN@C for levofloxacin under visible light irradiation was significantly superior to that of TiO 2-x @C and TiN without a heterostructure. Characterization tests and mechanistic analysis have revealed that the coupling of the heterostructure with localized surface plasmon resonance (LSPR) enhances photocatalytic activity. Additionally, the combination of photocatalysis with advanced oxidation methods has exhibited excellent catalytic degradation performance. This research provides novel insights into fabricating efficient LSPR-enhanced photocatalytic systems and a comprehensive understanding of the degradation pathways for LEV. [ABSTRACT FROM AUTHOR]

To further improve the catalytic desulfurization function of the Mg-Al spinel sulfur transfer agent in a fluid catalytic cracking (FCC) unit, the reaction paths of SO 2 oxidation by O 2 over the metal oxide surface of CuO (111) and CeO 2 (111) were investigated. In reference to the fact that SO 2 reacting with O 2 over CuO was a Mars-van Krevelen cycle, a similar reaction law for SO 2 oxidation over CeO 2 was also verified by characterization methods (e.g., IR, XPS). Meanwhile, the molecular simulation results indicated that the rate-control step of SO 2 oxidation over CeO 2 (111) and CuO (111) was a SO 3 desorption step. The lower energy barrier in the rate-control step corresponded to better catalytic performance; hence, it could explain the reason that CeO 2 had a better sulfur oxidization transfer performance than CuO. [ABSTRACT FROM AUTHOR]