Implementing All-Weather Photocatalysis of Exhaust Fumes Based on the g-C 3 N 4 /TiO 2 /SrAl 2 O 4 : Eu 2+ , Dy 3+ Ternary Composite Coating.

This study examines the use of SrAl₂O₄: Eu²⁺, Dy³⁺ long-afterglow materials doped into g-C₃N₄/TiO₂ coatings for photodegradation. The prepared sample was tested for the purification of automotive exhaust fumes, with the optimal mass ratio of g-C₃N₄/TiO₂ and SrAl₂O₄: Eu²⁺, Dy³⁺ determined to be 1:1. Characterization tests, including XRD, FT-IR, XPS, and TG-DSC, were conducted to evaluate the microstructure and properties of the samples. Under poor lighting conditions, g-C₃N₄/TiO₂ reduced CH and NO_x by 59 ppm and 13 ppm within 4 h, respectively, while g-C₃N₄/TiO₂/SrAl₂O₄: Eu²⁺, Dy³⁺ decreased CH and NO_x by 98ppm and 34ppm, respectively, resulting in a significant improvement in degradation efficiency. The addition of long-afterglow materials significantly improves the efficiency of photocatalysts in purifying exhaust fumes in low-light environments, providing potential value for all-weather exhaust treatment in the future. [ABSTRACT FROM AUTHOR]